JPH05164832A - Position determining method, position determining apparatus and position determining system for moving body with loran c and security system for moving body - Google Patents

Abstract

PURPOSE: To obtain a system and a method which cirtificate the position of a mobile object having a radio receiver receiving a low frequency radio wave induced from at least three loran C transmitters, and detect the position of an mobile object of illegal user and its identification. CONSTITUTION: Moving vehicles 11, 12, 13 receive radio waves from at least three loran C transmitting stations 14, 15, 16. Each vehicle pulse-modulates an individual carrier synchronously with each loran C received pulse, and transmits the carrier together with the identification code of own vehicle to near local master stations 18, 21 and the like, if necessary, via repeaters 22, 23 and the like. Each local master station analyzes received radio waves, and knows the position of each vehicle. These data are gathered by a central master station, which manages each mobile object, via necessary system and communication means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a system and method for detecting the position of a moving body, and more particularly to a structure for inducing a radio wave modulated by a pulse having a displacement time corresponding to the reception time of Loran C. And a plurality of moving body position verification systems and methods.

[0002]

2. Description of the Related Art Recently, there is a demand for detecting the position of a moving body such as a car or a boat. Various systems have been developed to monitor the position of mobiles. Such systems are used by owners of large numbers of vehicles such as rental cars and long haul trucks. Further, such a system can be used to locate a vehicle by an unauthorized user, such as a stolen vehicle.

US Pat. No. 4,651,157 to Gray et al. Discloses a system in which the position of a vehicle protected from theft responds to Loran C emissions. Each vehicle is equipped with a Loran C receiver and calculates the difference in the reception time of the Loran C pulse. The time difference signal is sent from the vehicle to a central station which calculates the longitude and latitude of the vehicle. Calculating the time difference in a vehicle requires a high performance microprocessor and a very stable clock source, which is very expensive. If a relatively inaccurate microprocessor and a conventional clock source are used, the accuracy of the time difference signal induced in each vehicle will not be sufficient for highly accurate position detection.

Accordingly, it is an object of the present invention to provide a new and advanced apparatus for locating a vehicle having a radio receiver which receives low frequency electromagnetic waves derived from at least three Loran C transmitters. , Providing systems and methods.

Another object of the present invention is to provide a relatively inexpensive new and advanced system and method for detecting the position and identity of a moving body by an unauthorized user.

Another object of the present invention is to synchronize the signal from the Loran C transmitter with a corresponding pulse to modulate the radio wave output from the mobile unit, and to detect the position of the mobile unit by an unauthorized user. It is to provide a new and progressive system and method for detecting.

Another object of the present invention is to provide a new and advanced system and method for detecting the position of a moving body in response to an identity command command registered at a central master station. ..

[0008]

DISCLOSURE OF THE INVENTION According to one aspect of the present invention, when detecting the position of a moving body equipped with a receiver for long waves (preferably Loran C radio waves), three predetermined stations are used. The first pulse of the low frequency radio wave is transmitted to the mobile body. In a typical operation of the Loran C system, the first pulse is transmitted from each station at precise intervals so that the pulses from other stations arrive at the mobile at different times. The first pulse of the low frequency radio wave is received by the mobile receiver. Then, the radio frequency radio wave modulated by the second pulse is transmitted from the mobile body. This second pulse has a displacement time position corresponding to and synchronized with the reception time of the first pulse when received by the receiver.
Radio frequency radio waves are received at a fixed location away from the moving body. The displacement time position of the second pulse is detected based on the radio frequency radio wave received at the fixed position away from the moving body. The position of the moving body depends on the detected displacement time position.

This method is used for mobile units (fleet, fleet, fleet) each having one receiver.
Each receiver has a different digital code. The local master station and individual receivers are communicatively coupled. By transmitting a code corresponding to the receiver via this connection (link), one of the receivers is selected, and radio frequency radio waves are transmitted from the selected receiver to the local master station via the link.

The plurality of local master stations are
It is located far away. These multiple local master stations communicate with the central master station. The displacement time position and the moving body position are calculated in each local master station. There are several advantages to calculating mobile position at the local master station rather than at the central master station. In particular, relatively low frequency bandwidth communication links, such as telephone lines, can be used between the local and central master stations. Furthermore, since the local master station need only hold the position of the closest Loran C transmitter, it becomes easy for the local master station to detect the position of the moving body. Once the local master station has calculated the position of the mobile, there is no need to keep track of the transmitting local master station at the central master station.

A digital serial number code corresponding to the location of the mobile is transmitted from the central master station to the local master station. It is also possible for the central master station to send other messages to the identified mobiles, such as voice signals, i.e. signals converted into auditory messages for unauthorized users in the mobiles. Such auditory signals may cause unauthorized users to abandon the vehicle.

According to another feature of the invention, the receiver in the mobile body comprises a section responsive to other radio waves emitted by a source moving by a legitimate operator. Other radio waves have a designated code that is converted there, which identifies the owner of another radio wave source, such as an authorized user of the mobile. Corresponding to the specified code of other received radio waves that is the same as the predetermined digital code in the receiver,
The receiver enters the first state at a predetermined interval (time). The receiver normally alternates into the second state. Radio frequency radio waves including a mobile serial number code and a replica of the received Loran C pulse from the mobile are transmitted at predetermined intervals.

According to another aspect of the present invention, the state of the moving body is detected. The transmission of radio frequency radio waves from the mobile body is controlled based on the state of the mobile body and other received radio wave codes.

Another object of the present invention is to provide a new and advanced apparatus suitable for mounting on a moving body, which apparatus detects the detected moving body state and confirms the moving body. A predetermined code for selectively transmitting a radio wave having a signal converted into a display signal of the above and Loran C received by a mobile body
It responds to radio waves that have a pulse that is synchronized with the pulse and has a corresponding time position.

Still another object of the present invention is to provide a new and advanced security system suitable for mounting on a mobile body. In this system,
An indication of the position of the mobile is sent to a remote location in response to a sensor on the moving mobile and a code signal induced by a legitimate user of the mobile not normally received by the mobile. ..

Yet another object of the present invention is to provide a local master station for use in a system for locating a vehicle in response to Loran C release.

Another object of the present invention is to provide a local master station for use in a system for determining the position of a vehicle in response to loran C release, in which the local master station to the central master. Since the data is transmitted to the stations, the central master station does not have to keep track of the local master station transmitting the signal.

Another object of the present invention is to provide a local master station capable of communicating with a central master station via a relatively low bandwidth communication link, the local master station being central to the station. Responsive to the corresponding pulse synchronized with the Loran C pulse received by the mobile in communication with the master station.

While one embodiment of the invention is disclosed by the text and drawings, the embodiment illustrated in detail is not to be departed without departing from the spirit and scope of the invention as defined in the appended claims. It goes without saying that various design changes are possible.

[0020]

1 shows a motor vehicle 1 equipped with the device according to the invention.
A 1,12,13 position calibration system is shown.
Vehicles 11 and 12 are relatively close to each other, while vehicle 13 is slightly remote from vehicles 11 and 12.
All cars 11-13 have fixed Loran C transmitters 14,
Low frequency transmitted from 15 and 16 (about 100 kHz)
The fixed Loran C transmitters 14, 15 and 16 are in close proximity so that the wireless radio wave can be reliably received. The Loran C transmitters 14-16 are part of the actual Loran C network covering substantially all land parcels in the United States. Low frequency radio waves derived from transmitters 14-16 are modulated by pulses of relatively short duration. These pulses are transmitted by the transmitters 14-16.
Generated at different times as received by all cars in the area covered by ~ 16. In most parts of the United States, Loran C transmitters 14-16 are each about 400 miles apart.

In the area covered by the radio waves from the transmitters 13 to 15, the local VHF (30 to 300) is used.
MHz) -UHF (300 MHz to 3 GHz) transmission network forms part of the present invention. Only two networks 17 and 18 of such local transmission networks are shown in FIG. Cars 11 and 1
2 is located within the transmission area of the network 17 and is a car 1
3 is located within the transmission area of the network 18. Networks 17 and 18 are basically the same, the description of network 17 is sufficient for network 18, and so on for the rest of the system.

The local network 17 includes a fixed local master station 21 and a fixed relay station 2.
It contains 2,23. Typically, relay stations 22 and 23 are located approximately 50 miles from local master station 21 and approximately 30 miles from each other. The exact spacing between stations 21 and 23 is a function of terrain and interference structures. Full duplex VHF and UHF
The connection (generally 150 mHz and 465 mHz) is performed by the local master station 21 and the relays 22, 23.
Exists between and. A telephone line or microwave satellite link exists between the local master station of the local network 18 and the central master station, as well as between the local master station 21 and the fixed central master station 24.

In a perfect network, many different local networks, such as networks 17 and 18, are located in different regions throughout the United States. The local network responds to Loran C transmitters throughout the United States. These local master stations within each local network are paired with the central master station 24 via a telephone line or satellite link.

The vehicle 11 has equipment for implementing a radio wave link between the VHF and UHF repeater 22. The vehicle 11 comprises a 150 mHz VHF transmitter for relaying the 150 mHz signal to the local master station 21 and supplying radio waves to the relay 22.
The vehicle 11 is also equipped with a 465 mHz UHF receiver, which is responsive to voice and data modulation performed at the central master station 24, and which is 465 mHz.
The vehicle 11 is paired with the local master station 21 via the UHF link and the repeater 22. The vehicle 11 is further equipped with a low frequency receiver, which is responsive to the pulses modulated by the low frequency radio waves output from the Loran C transmitters 14-16.

To obtain the security features of the vehicle 11, the authorized driver of the vehicle is equipped with a keypad containing an inductive transmitter with a range of about 200 feet. Inductive transmitter responds to key presses on the keypad 2
About 303 mHz modulated by two audio tones
The carrier wave is transmitted. The modulation frequency of the guided wave of 303 mHz extracted from the keypad 25 corresponds to the double frequency generated by the telephone keyboard.

The automobile 11 also has a well-known sensor for detecting when the door of the automobile is opened and when the motor is operated. The operation of the automobile motor is monitored by measuring the current flowing through the high voltage coil of the engine, and the opening and closing of the door is performed by turning on and off the interior light of the automobile.
It is detected by the same circuit element that controls.

All automobiles whose position can be detected according to the invention are given a different serial number, generally a number represented by an 8-byte hexadecimal number. In addition, each car in a particular area is given a different four-digit code, which is the authorized driver's keypad 2
5 corresponds to a special code sequence derived from 5. The proper sequence of numbering from the keypad 25 is
Circuit elements in the vehicle 11 are disabled so that communication from the vehicle to the repeater 22, the local master station 21, and the central master station 24 is not performed in response to the operation of the vehicle.

However, if the vehicle is started without the generation of the proper number sequence from the keypad 25, then a transmission link from the vehicle 11 to the local master station 21 is made. The signal transmitted from the vehicle 11 to the local master station 21 via the repeater 22 includes an indication of the vehicle serial number represented by an 8-byte hexadecimal signal. Furthermore, transmitter 1
Loran C transmitted from 4 to 16 and received by the automobile 11
The pulses are converted to pulses that modulate the VHF link from the vehicle 11 via the repeater 22 to the local master station 21. The pulse that modulates the VHF carrier transmitted from the automobile 11 to the local master station 21 has a displacement time position corresponding to the reception time of the pulse from the Loran C transmitters 14 to 16 in the automobile 11.

At the local master station 21, the relative arrival time of the Loran C pulse is calculated. In response to the calculated Loran C pulse arrival time, a digital signal indicating the position of the automobile 11 in longitude and latitude per second is induced. These digital signals together with the digital signal indicating the serial number of the automobile 11 are transmitted via the telephone line or satellite link to the local master station 2
1 to the central master station 24.

The calculation of the position of the automobile by the local master station 21 in this way has some advantages over the calculation in the automobile or by the central master station 24. Detecting the relative time positions of the Loran C pulses from the transmitters 14-16 on the vehicle 11 is disadvantageous in that it requires a relatively expensive and fast microprocessor and accurate clock source. If the car is transmitter 14 ~
The presence of the pulse from 16 is detected, and the carrier wave having the corresponding pulse is modulated in synchronization with the received signal so that the transmitted signal from the car has the same relative generation time as the pulse received from the Loran C transmitter. If so, conventional low frequency microprocessors and relatively low stability crystal oscillators can be used in automobiles 11-13. In general, the cost of conventional relatively low frequency microprocessors and low stability oscillators is about one tenth that of high frequency microprocessors and high performance clock sources. At least cost savings through technology is allowed in systems containing 10,000 vehicles.

The calculation of the longitude, latitude and time difference of the vehicle at the local master stations of each local network, but not at the central master station 24, includes a relatively low bandwidth link between the local master station and the central master station 24. It is possible. A typical wire-based telephone link is high enough to maintain the time required for Loran C pulses from transmitters 14-16 to be received by the vehicle and relayed to local master station 21 via repeater 22. Does not have a bandwidth. Moreover, the calculation of the vehicle's coordinate position at the local master station 21 eliminates the need for a real-time link of a replica of the Loran C pulse from the local master station 21 to the central master station 24 received by the vehicle. A real-time link between the local master station 21 and the central master station 24 is often avoided so that the central master station can control the transmission of signals.

Another advantage of locating the vehicle at the local master station over the location at the central master station 24 is that the location of the vehicle can be detected by a local master station identification signal (idea) to the central master station. Need not be sent). The local master station stores a signal indicating the position of the fixed Loran C transmitter, which is predetermined and closest, and the vehicle supplying the signal to the local master station responds to the transmitter. Therefore, the calculation of the position of the vehicle at each local master station is easier to perform than at the central master station 24.

In some situations, at the central master station 24, apart from signals from the keypad unit 25 or other sensors in the vehicle, such as door opening and closing sensors or high voltage coil sensors, a particular vehicle such as vehicle 11 may be used. It is required to detect the position of the moving body. For example,
For car rental shop and transportation company owners,
It is necessary to know the position of the car. In such an example, central master station 24 sends signals to all local master stations. Therefore, the transmission signal includes an 8-byte hexadecimal serial number code for detecting the position of the automobile. The signal from the central master station 24 is received at all local master stations. The automobile certification signal is relayed from each local master station to a repeater of the local network paired with the station. The repeater and local master station couple the signal to all vehicles within a specific area covered by a specific local network at the UHF. A vehicle having the same serial number code as the vehicle serial number code derived and transmitted from the central master station 24 will thereby receive the signal in order to relay a replica of the Loran C pulse of the transmitters 14-16. It becomes operational. The Loran C signal received on the vehicle 11 is modulated into a VHF signal transmitted to the vehicle 11, as is the vehicle certification serial number code. The VHF signal is transmitted from the automobile 11 via the repeater 22 to the local master station 21 which calculates the longitude and latitude of the automobile 11. In response to the inquiry from the central master station 24, the vehicle certification code and the longitude and latitude of the vehicle 11 are transmitted from the local master station 21 to the central master station 24.

The local master station functions as a receiver of the UHF signal supplied via the repeaters 22 and 23 or the UHF signal directly transmitted from the automobile 11 to the local master station 21. The receiver of the local master station 21 is similar to that used in a general Loran C receiver in order to know the time separation between two adjacent pulses corresponding to the Loran C pulse received by the vehicle 11. It is equipped with circuit elements.
The decision time separation between replicas of the Loran C pulse received by the local master station 21 is supplied to a general position determination computer which derives a digital signal indicating the longitude and latitude of the vehicle 11. Longitude of car 11,
The digital signal indicating the latitude modulates the signal transmitted from the local master station 21 to the central master station 24, like the digital signal corresponding to the certification code of the vehicle 11.

At the central master station 24, in order to indicate the position of the motor vehicle 11, in addition to the numerical value for the coded serial number certifying the motor vehicle, the signal from the local master station 21 is detected and displayed or printed out.

Components installed in each car (UHF-
A block diagram of the VHF antenna 31, the low frequency antenna 32, the door sensor 33, the high voltage coil sensor 34) is shown in FIG. Sensors 33 and 34 provide binary one level signals in response to door opening and engine operation, respectively. In all other cases, the sensors 33 and 34 output a binary 0 level signal, ie ground level. The antenna 31 is in a communication link with the repeater 22, and in the system of FIG. 1 showing the installation of the device shown in FIG. 2 in the car 11, the repeater or local master station closest to the car 11. UHF-
Perform a VHF link. The low frequency antenna 32 responds to the low frequency Loran C emitted from the three closest Loran C transmitters. In the system of FIG. 1, the antenna 3
2 responds to Loran C emissions from transmitters 14-16.

The antenna 21 is also 303 m pulled out from the keypad 25 for modulating the numerical value indicating the double signal tone.
Reacts to Hz induced waves. The UHF wave converted by the antenna 31 is supplied in parallel through a normally closed contact 35 to a UHF receiver 36 and a keypad receiver 37 which are set to react with electromagnetic waves of 465 mHz and 303 mHz, respectively. The receiver 36 has an audio frequency indicating any of the binary data from the central master station 24,
Alternatively, it receives an audio signal from the central master station. The data signal is supplied to the input terminal of the signal processing circuit 39 via the normally closed contact 38, and the audio signal is selectively supplied to the loudspeaker 42 via the normally open contact 41. The contacts 38 and 41 respond to a signal on the lead 43 output from the signal processing circuit 39 and open or close during the mutual exclusion time.

The keypad receiver 37 includes a signal processing circuit 3
Responsive to audio tones modulated on the 303 mHz carrier to provide 9 with a signal indicating the drive keys of the keypad 25. The processing circuit 39 detects whether the numerical sequence supplied to the keys of the keypad 25 corresponds to the numerical sequence associated with the vehicle 11 or not.
7 output signal. The numeric sequence of the vehicle 11 for the keypad 25 contains significantly fewer digits than the vehicle serial number verification code transmitted between the vehicle 11 and the master station 24 via the VHF link. The car horn and headlights can be turned on and off from the keypad 25 that responds to the operator of the keypad 25 that matches with the four-digit car certification code. This operation can be done by two or more key operations linked to different functions. is there.

The signal processing circuit 39 responds to the output signals of the keypad receiver 37 in addition to the door sensor 33 and the high voltage coil sensor 34 to provide control signals to the various switch contacts shown in FIG. To do. Circuit 39 also responds to code signals provided by receiver 36 via switch 38 to provide control signals for the various contacts.

The VHF link between the vehicle 11 and the local master station 21 is carried out by a VHF transmitter 44 with an output frequency of 150 mHz. Transmitter 44
The output of is always supplied to the antenna 31 through the open circuit contact 45. The contacts 35 and 45 respond to the output signal of the processing circuit 39 on the lead 46 so as to open and close at the mutually exclusive time. The power supply terminal 47 of the transmitter 44 is always separated from the motor vehicle + 12V power supply terminal 48 by a normally open contact 49 in order to minimize the circuit power requirements. Contact 49 is contact 4 that responds to the signal on lead 46.
It opens and closes in synchronization with the opening and closing operations of 5.

The VHF transmitter 44 selectively reacts to the binary data output signal of the signal processing circuit 39 at different times, and from a low frequency amplifier, detector 52 having an input terminal connected to the low frequency antenna 32. Responsive to the supplied Loran C pulse. The low frequency amplifier and the detector 52 output the antenna 3 from the Loran C transmitters 14 to 16.
A pulse synchronized with the Loran C pulse supplied to 2 is supplied. The low frequency amplifier / detector 52 includes a power supply terminal 53 that is always connected to the + 12V power supply terminal 48 via a normally closed contact 54. The contact 54 responds to the output signal of the signal processing circuit 39 on the lead 55. The signal on lead 55 also controls the opening and closing of normally closed contacts 56 and normally open contacts 57. The contact 56 is connected between the output of the low-frequency amplifier / detector 52 and the input of the VHF transmitter 44, and the lead 5 is connected when the contact 57 is closed.
The data output of the signal processing circuit 39 on 1 is supplied to the input terminal of the transmitter 44. Contacts 54 and 56 are closed to provide a replica of the received Loran C pulse to the input terminal of transmitter 44 while the data signal on lead 51 is separated from the input of the VHF transmitter. And 57 open and close in a mutually exclusive time in response to the signal on the lead 55. When a binary data signal is provided on the lead 51 from the processing circuit 39, the contacts 54 and 5 are closed while the contact 57 is closed so that the VHF transmitter 44 responds only to the data signal.
6 is open.

The buzzer 58 emits an audible sound when a voltage is applied, and is connected to the output of the signal processing circuit 39. The signal processing circuit 39 responds to the output signals of the keypad receiver 37 and the door sensor 33, and when the vehicle door is opened even though the 4-digit vehicle code output from the keypad 25 is not entered, the sensor 33 outputs the signal. The signal provides pulses to the buzzer 58. The pulse is provided to the buzzer 58 for a few seconds to prompt the registered user of the vehicle to enter the 4-digit vehicle code into the keypad 25.

The signals from the door sensor 33 and the keypad receiver 37 are combined in a signal processing circuit 39 to produce the vehicle 1
The normally open contact 59 connected in series with the 2V supply terminal 48 and the vehicle ignition circuit 61 is selectively closed. The normally open contact 59 will only close in response to a four digit vehicle code that is correctly received by the receiver 37.

The vehicle horn and headlights are driven in response to the output signal of the signal processing circuit 39 to provide visual and auditory information indicating that the vehicle is being used by an unregistered user. The output signal of circuit 39 is provided to normally open contacts 60 and 64 which are connected to the vehicle horn and headlight respectively. In response to the input from the receiver 36 to the signal processing circuit 39, one or both of the contacts 60 and 64 are closed, the vehicle horn sounds, and with it or the headlights flash. The horn 62 and the headlight 63 are selectively driven in a normal manner in which they are responsive to the manual closing of the switches 65 and 66 connected between the terminal 48 and the horn 62 and the headlight 63, respectively.

The signal processing circuit 39 includes a microprocessor having an electronic read only memory (ERAM). This microprocessor is set to a relatively low frequency, such as IN8031 driven by a general crystal oscillator having a relatively low stability.

The microprocessor of the signal processing circuit 39 is programmed such that the system is in a normal or armed state. The signal from the door sensor 33 and / or UHF in the non-use or reinforcement state.
Wait for signals from receiver 36 and keypad receiver 37.

The program of the signal processing circuit responds to the door sensor 33 which outputs one level of the binary signal to switch from the idle state or the reinforcement state to the active state. Door sensor 33
In response to the binary 1 signal from, the circuit 39 provides a pulse to the buzzer 58 for a few seconds, alerting the person in the vehicle to enter the four digit vehicle identification code in the keypad 25. In response to a legitimate code detected by the receiver 37 for 30 seconds of the binarized one level signal supplied by the door sensor 33, entered into the keypad 25,
The circuit 39 supplies a binary 1 signal to the contact 59 so that the vehicle ignition circuit 61 is driven for 2 minutes.

During this two minute interval, the circuit 39 monitors the output of the high voltage coil sensor 34 to detect if the vehicle engine is running. If the engine is not running or does not start for one minute of the closed contact 59, the program returns to the idle or reinforced state. This state represents that the door sensor becomes active in response to an occupant remaining in the vehicle, as in the case where no one is trying to drive in the vehicle. If the engine runs during the two minute interval after contact 59 closes, the state of the program in the microprocessor will be high voltage coil sensor 3
It is frozen until a binary 0 signal is supplied from 4 or a message is given to the circuit 39 by the receiver 36. In such a situation, if a data signal is provided by the receiver 36 to the signal processing circuit 39, the data signal governs the operation of the various outputs of the signal processing circuit 39. In particular, since the data signal alternately opens and closes the contacts 60 and 64, the automobile horn 62 and the headlight 63 repeat the ON-OFF operation, so that it can be easily detected that the automobile is used by a non-registered person.

However, if no signal is provided from the receiver 37 to the circuit 39 when the engine is running, the program will program the binary transition of the high voltage coil sensor 34 from the 1 level to the 0 level. It does not proceed to other states until detected by 39. Signal processing circuit 3
The program of 9 returns to the dead or reinforced state 1 minute after the detection of the transition by the circuit.

If the regular 4-digit code is not received by the keypad receiver 37 and the binary transition from 0 to 1 is supplied to the signal processing circuit 39 within 30 seconds after being supplied by the door sensor 33. If so, the signal processing circuit 39 keeps the contact 59 open and, as a result, the terminal 48.
The electric power is not supplied to the vehicle ignition circuit 61 due to the voltage. At the same time, the circuit 39 supplies the lead 46 with one level of binarization, so that the indirect points 45 and 49, with which the contact 35 is open, are closed. At this time, the circuit 39 also supplies the lead 55 with one level of binarization and the contacts 54 and 56.
The indirect point 57 that is open closes.

In such a situation, the 8-byte automobile serial number signal is read by the program of the circuit 39.
1 and the contact 57 to the transmitter 44. This 8-byte serial number signal modulates the transmitter 44 so that the transmitter transmits 150 to antenna 31 via contact 45.
A mHz signal is provided. The 150 mHz signal modulated by the serial number is transmitted from the antenna 31 to the repeater 2
2, the local master station 21, and the central master station 24. After the serial number is transmitted, the signal processing circuit 39 supplies the binary level 0 to the lead 46, and as a result, the contact 35 returns to the normally closed state and the contacts 45 and 49 return to the normally open state. Contact 3
5, 45, 49 maintain this state for about 2 minutes, and receiver 3
6 and circuit 39 await the reaction of central master station 24. At the same time, a zero level of binarization is supplied by the circuit 39 to the contacts 64, which causes the vehicle horn 62 and the headlight 6 to
3 repeats ON-OFF operation.

If there is no response from the central master station 24 at the receiver 36 within 2 minutes, the circuit 39 again supplies a binary 0 level to the lead 46 and again from the central processing station. Transmitter 4
4 to 8 byte car serial number signal is supplied. Such an operation is repeated until the code vehicle serial number signal is received by the receiver 36 from the central master station 24 and then detected by the signal processing circuit 39.

The signal provided by the signal processing circuit 39 from the receiver 36 via the contact 38 indicates to the processing circuit that the central master station is an automobile used by an unregistered user. The central master station is ready to track the location of the vehicle. The circuit 39 responds to such a code signal by supplying the binary level 0 to the lead 55, and the power is supplied from the contact 54 to the power supply terminal 53 of the low frequency amplifier / detector 52, so that the low frequency is supplied. The outputs of the amplifier and the detector are connected to the input of the VHF transmitter 44. At the same time, the circuit 39 supplies the binary level 0 to the lead 46, the power is supplied to the transmitter 44 via the contact 49, and the output of the transmitter is connected to the antenna 31. In such a situation, the replica of the Loran C pulse detected by the low frequency amplifier / detector 52 is
It is transmitted for several seconds to a transmitter 44 which modulates a 150 mHz carrier.

After several seconds, the signal processing circuit 39 reads the lead 4
6 is supplied with 0 level of binarization, and UHF receiver 4
6 is again connected to the antenna 31 and the transmitter 44 separates from the antenna. If the central master station completes transmission of the Loran C pulse replica from transmitter 44,
If the code signal indicating that the Loran C pulse has been received during the minute is not supplied to the receiver 36 by the antenna 31, the signal processing circuit 39 supplies the binary level 0 to the lead 46 again. .. The replica of the Loran C pulse is again connected to the antenna 31 by the transmitter 44.

The above operation continues until the receiver 36 supplies the signal processing circuit 39 with the information of the longitude and latitude of the automobile 11 by the central master station 24 and the approval reception signal of the automobile serial number. Such a receiver 3
In response to the supply of the code signal by 6 to the signal processing circuit 39, the unit becomes passive. In this passive state, circuit 39 provides a 0 level signal to leads 46 and 55. In the same passive state, several different pieces of information (messages) are sent to the central master station 24.
Sent to the car 11. In addition, the signal is keypad 2
5 to the receiver 37. Receiver 36 during this time,
The signal received by 37 causes the signal processing circuit 39
Has various functions such as driving a headlight 62 and a horn 62 of an automobile.

Under these circumstances, several different messages are sent from the central master station 24 to the vehicle 1
Sent to 1. For example, the central master station 24
The audio signal generated in (1) is supplied to the speaker 42 at a predetermined interval. Such operations are performed by the central master station 24 which supplies a predetermined code signal to the circuit 39 via the receiver 36. With this code signal, the circuit 39 supplies a 0 level signal to the lead 43, and the contact 41 is closed.
2 reacts to the audio output signal of the receiver 36. During a predetermined interval, a voice message is sent from the station 25 to the car 31 to the unregistered user that his / her whereabouts are already known, for example, "The police tell the unregistered user of the car, The vehicle is near the intersection of the main road and the road that intersects it. " After a predetermined time interval has elapsed, circuit 39 sends a 0 level signal to lead 43 and waits for the next command from receiver 36 or keypad 25. One of the signals from the central master station 24 is a 1 level signal on lead 46 while a 0 level signal is provided on lead 55.
Circuit 39 is activated. In such a state, the central master station 24
The location of the vehicle 11 is determined based on the replica of the Loran C pulse transmitted by the detector 52 from the transmitter 44 to the local master station 21, along with the vehicle code and other data transmitted to the local master station 21. Circuit 3
After the 9 connects the detector 52 and the transmitter 44, the vehicle serial number 8 byte signal is transmitted by providing a one level signal to the leads 46,55.

Referring to FIG. 3, there is shown a block diagram of an apparatus provided in the local master station 21. The station 21 is a UHF-VHF antenna 71.
This antenna includes a VHF receiver 72 and a UH
Each is connected to the F receiver 73, receives the 150 mHz signal from the automobile 11, and transmits the 465 mHz UHF signal received by the receiver 36. The transmission between the antenna 71 and the antenna 31 may be direct or via the repeater 22.
Or 23.

The receiver 72 extracts a baseband signal which is a replica of the signal supplied to the transmitter 44. Accordingly, the receiver 72 extracts the pulses corresponding to the vehicle serial number binarization signal, and these pulses are supplied to the vehicle serial number detector 74. Further, the receiver 72 synchronizes with the reception time of the Loran C pulse extracted from the low frequency amplifier / detector 52 (FIG. 2) and extracts a pulse having a corresponding generation time. The output pulse of the receiver 72 corresponding to the time separation of the Loran C pulse received by the automobile 11 is supplied to the time difference detector 75 which supplies a multi-bit digital signal to the bus 76. The digital signal on the bus 76 represents the time separation of the Loran C pulse received by the low frequency receiver of the vehicle 11 and is provided to the longitude / latitude computer 77. The computer 77 comprises a memory that stores the longitude and latitude of the Loran C transmitting station closest to the local master station of which it is a part. The computer 77 extracts a multi-bit digital signal indicating the longitude and latitude of the automobile 11 based on the output of the detector 75 and the stored signal.

The longitude and latitude representing the output signal of computer 77, including memory responsive to the serial number representing the output of detector 74, is provided to microprocessor 79 by bus 78. A serial number indicating the signal picked up by detector 74 is provided to microprocessor 79 from bus 81. The microprocessor 79 uses the bus 7
Responsive to the signals supplied to 8, 81 and the program stored therein, providing a sequence of binarized signals on lead 82. The signal on lead 82 represents the vehicle serial number and its longitude and latitude.

The signal on lead 82 is provided to telephone receive-transmit circuit 83, typically in the form of a modem. This modem takes the output provided on a telephone line 84 connected to the central master station 24. Alternatively, a satellite link may be provided between the output of microprocessor 79 and central master station 24.

Modem 83 responds to the two-level voice and data signals provided by central master station 24 as it is transmitted over telephone line 84. Modem 83
Is the UHF transmitter 7 via the signal information network 85.
Central master station 2 by connecting 3 inputs
4 or any other link existing between master stations 21 and 24.

FIG. 4 shows the central master station 24.
A block diagram of is shown. The central master station 24 is equipped with a keyboard and a memory 91 for extracting a multi-bit, two-level signal. In general, the signal retrieved by the keyboard, memory 91 represents the serial number of the car being called. In addition, movement commands for the functions of the vehicle are triggered by movements of the keyboard. For example, a command can be triggered to continuously drive the vehicle's headlights or horns to call a police officer's attention that the vehicle is being driven by an unregistered user. Such a signal, after being transmitted from the station 24 to the motor vehicle 11, is identified by the signal processing circuit 39 and the switch 60.
And / or 64 to turn it on and off.

The central master station 24 is equipped with a voice source 92, which may be a microphone responsive to a human voice or a voice synthesizer responsive to an instruction that the vehicle is being used by a non-registered person ( A synthesizer) can be used. The audio source outputs a signal that is selectively converted into an auditory signal by the speaker 42, eg, a non-registered person driving a stolen vehicle said, “I know where I am, I have already been sent to the police. The content such as "I am there" is sent as a voice.

Keyboard, memory 91 and audio source 9
2 is connected to the input of the telephone receiver / transmitter or to a modem 93 which converts the data signal from the circuit 91 into a dual tone signal having a frequency based on the binary level of the data signal. The keyboard, memory 91 and audio source 92 are driven such that the signals from the audio source are retrieved after the automatic serial number signal is generated by circuit 91 and supplied to circuit 93. When using the audio source 92, in common with the duration of the signal from the audio source 92, the vehicle serial number code is read by the circuit 39 to command the switch 41 at predetermined intervals. Follows the bit signal.

The central master station 24 has a circuit 9
3 has a data detector 94 responsive to the output signal of 3. The data detector 94 detects the vehicle serial number and calculates the longitude and latitude signals supplied to the modem 83 (FIG. 3) by the microprocessor 79. Data detector 94
Output signals of the printer 95 and the map display 96.
Are supplied in parallel. Based on the signal from the detector 94, the printer 95 displays the position and serial number of the vehicle where the electric transmission occurs. The operator drives the keyboard 91 and the audio source 92 based on the output of the printer 95. At the same time, the keyboard 91 and the audio source 92 react directly to the output signal of the data detector 94 via an automatic link containing a microprocessor.

The map display 96 is preferably
The first is a rough display of the vehicle position in a video display form. Upon operator selection, a sub-analyzed map showing the location of the vehicle is displayed on the display. The overlay on the map is a blinking display with the car serial number on it.

No interactive relationships between the data detector 94, printer 95, keyboard 91, and audio source 92 are required. If the device is used, for example to detect the position of a car in a group of car rentals, the lender may wish to locate the particular car in the group. In such an example, the car serial number is displayed on the keyboard 91.
Entered in. The vehicle with the input serial number responds to the signal transmitted via the UHF link. In response to such signals, the car
The transmission including the serial number and the replica of the supplied Loran C pulse is started.

FIG. 5 shows a circuit diagram of the device provided in the keypad 25 of FIG. The keypad of FIG. 5 pulls out the fixed carrier at a frequency of 303 mHz.
This carrier is a guided wave that is modulated by a pair of voices, and the keyboard 10 is driven by the defined frequency.
The nine keys 101 to 108 are activated. The voice frequency is the same as the frequency extracted from a telephone handset that responds to activation of the handset keys 1-8.

The keys of the keyboard 109 have a power supply terminal connected to the positive power supply terminal 112, and are connected to the three inputs of the voice generation integrated circuit 111. With one of the actuated keys 101-108, the audio generator 111 retrieves the signal that drives the bias transistor Q8, and the audio generator responds to the excitation by the crystal X1 303.
Extract the mHz output. The 303 mHz carrier extracted by this generator 111 is modulated by a frequency pair, the value of which is determined by the binarized signal on the leads connected to the keys 101-108.

The output of the audio generator 11 is fed to an RF transmitter including cascade transistors Q4 and Q5, with a surface acoustic wave (SAW) bandpass filter 11 having a center frequency of 303 mHz between the transistors Q4 and Q5.
3 is connected. Therefore, the coil extracts the induced wave having the frequency of 303 mHz together with the superimposed double sound modulation.

FIG. 6 shows a detailed circuit diagram of the device shown in the block diagram of the type shown in FIG. Figure 6
6A to 6I are included in FIG.
6B and 6C are connected by terminals AA and AA on the same drawing, so that terminals having the same name are connected by II respectively.

The low frequency amplifier / detector 52 uses a low frequency signal (Loran C signal transmitted by the antenna 32).
Reacts to inductor L1 and capacitor C
1, C2, C24, and this capacitor C1,
C2 and C24 are connected between the antenna and the input of the preamplifier, and the preamplifier is a grounded-emitter transistor Q81.
.About.Q83, Q86, Q87, and a resistor (R-C) connected to the stage of the high gain preamplifier. The output of the high gain amplifier has an inductor L9, capacitors C81, C82, C1 at the collector of the transistor Q87.
A bandpass filter including 45 is supplied to an amplifier including cascade-emitter grounded transistor stages Q14 to Q16. The output of the amplifier is a diode D6 which is extracted at the collector of the transistor Q16 and is branched to the register 74 via the capacitor 90.
And a detector including a capacitor C92. Power is selectively supplied to the emitter-collector paths of transistors Q14-Q16 by the contacts of relay K2, which correspond to the contacts of switch 54 in FIG. The pulses emitted by the detector with the diode D6 are transmitted by the antenna 3
Synchronized with the Loran C pulse received and converted by
And it has a corresponding occurrence time.

The pulse developed by the detector with diode D6 is coupled to VHF transmitter 44 by a network with resistors R71, R72, together with the contacts of capacitor C96 and relay K1. The contacts of this relay K1 correspond to the contacts 56 of FIG.

The VHF transmitter 44 comprises an MC2833 excitation integrated circuit U17 which has a data source and an input responsive to a replica of the Loran C pulse. The input of this circuit U17 relays a network including a resistor R49 and a capacitor C58. The transmission excitation circuit extracts an output signal having a frequency of 150 mHz. The 150 mHz output of the modulated excitation circuit becomes a replica of the data pulse and the Loran C pulse depending on the driving state of the relay K1.

The 150 mHz modulated output radio wave of the excitation circuit is
It is supplied to the input terminal of a relatively high power tuned transmit amplifier including cascade transistors Q17-Q19. The amplifier including the transistors Q17 to Q19 includes series and branch inductors and capacitors, in addition to the ferrite beads FB2, FB3, and FB4.

Transistors Q17-Q19 are passed through the contacts of relay K1 corresponding to the contacts of switch 49 in FIG.
Power is selectively supplied to the emitter-collector path of the. The output signal of the transmission amplifier at the collector of the transistor Q19 is selectively connected to the antenna 31 by the contact of the relay K1 corresponding to the switch contact 45 of FIG.

The signal received and converted by the antenna 31 is connected in parallel to the receivers 36 and 37 via the contact of the relay K1 corresponding to the contact 35 of FIG. UHF
The receiver 36 basically comprises transistors Q1 to Q4 arranged as a tuning amplifier with a center frequency of 465 mHz, a mixer, an intermediate frequency filter and a demodulator. A signal with a frequency of 465 mHz is supplied to the emitter of the grounded-base transistor Q1 by a coupling network including capacitors C3 and C4. The amplified output signal of the transistor Q2 passes through the network including the converter T1 and the ceramic filter CF1,
The signal at the collector of the transistor Q1 is supplied to the base of the transistor Q2 connected in the grounded-emitter mode, as it is supplied to the base of the transistor Q5 having a collector connected to the 361 demodulation integrated circuit U9. An oscillator including transistor Q4 and a mixer including transistors Q2 and Q3 are provided to provide the required frequency shift. The receiver 36 is an integrated circuit U9.
At pin 9 of, the demodulated baseband signal which is a replica of the signal extracted by the master station 21 is extracted. This baseband signal is passed through the network including the resistor R30, the capacitors C35 and C76, and the potentiometer VR1 and then the switches 38 and 41 shown in FIG.
Is supplied to the contact of the relay K3 corresponding to.

The output signal of the UHF-VHF antenna 31 is coupled to a keypad receiver 37 which includes a super regenerative receiver having a tuned bandpass filter with a center frequency of 303 mHz. This super regenerative receiver includes a transistor Q20. The output signal of the super playback receiver is the keypad transmitter 25.
The output signal contains a baseband audio signal having the same frequency as that of the signal extracted from the output signal SSI2 via a network including a resistor R76 and a capacitor C134.
02 is supplied to the analog input pin 9 of the integrated circuit U7 (double tone telephone receiving circuit).

The signal processing circuit 39 includes an IN8031 microprocessor chip U1, a 74LS373 latch integrated circuit U2, an ET2716 integrated circuit EPROM (electrical programmable read only memory).
U3, LS138 three-to-eight reader integrated circuit chip U5, SSI208 dual tone telephone integrated circuit chip U7, ALM555 integrated circuit U8, 4 kHz
Pulse source and IN567 data reader integrated chip U
14, an LM555 integrated circuit U16, a 250 Hz pulse source, and a transistor switch 212. The switch 212 reacts to the data signal extracted by the signal processing circuit 39 and modulates the signal into the 4 kHz output of the oscillator U8. The signal processing circuit 39 is
Driven by a conventional clock source including an 8 mHz crystal X5.

The microprocessor U1 is selectively activated for one of the two states. The normal operation state of the microprocessor U1 is the door sensor 3
Interrupted by a signal derived by either 3 or the high voltage coil sensor 34. Transistor Q1
The output of 3 is directly supplied to pins 2 and 14 of the microprocessor U1 via an interval amplifier.

Pin 15 of microprocessor U1 is responsive to the output signal of the diphone telephony integrated circuit U7 on pin 14. The signal on pin 14 of circuit U7 represents that the analog sound signal is provided to the integrated circuit U7 on pin 9 by the super regenerative receiver including transistor Q20.
The output of circuit U7 at pin 14 controls microprocessor U1 so that circuit U1 selectively enters the normal and suspended states.

At the same time that the circuit U7 drives the microprocessor U1 into the super-reception receiver (including the transistor Q20 for deriving a signal) indication, the circuit U7 is connected to pin 1,
A 3-bit binarized signal is taken out on 17 and 18. The 3-bit binarized signal on pins 1, 17 and 18 indicates that one of the eight keys on the keyboard of keypad 25 is actuated. Pins 1, 17, 1 of 3-bit circuit U7
The digit indication signal at 8 is provided on pins 3-5 of microprocessor U1.

Microprocessor U1 responds to the numeric display signals provided on pins 3-5. The reaction is performed by comparing the level of the signal with a pre-stored location-specific composite number display value. The numerical value is stored in the EPROM U3. The composite number indicating the 3-bit signal is EPROM U3.
Pins 9-11 of the smallest three significant bits of the CLK in response to the EPROM being addressed by the microprocessor are provided to pins 41-43 of the microprocessor. EPROM U3 responds to the signals taken at pins 24-26 of microprocessor U1 and outputs the signals to EP
Addressed by supplying to pins 22, 23, 19 of the ROM.

The microprocessor U1 is an EPROM
Numerical display 3-bit signal supplied by U3 and circuit U
7 is programmed to compare with the signal provided by the output of 7 (indicating the numeric value of the key of the activated keypad 25). While the normal operation of the microprocessor U1 is interrupted by the signal supplied to the pin 2 of the microprocessor by the transistor Q13, it is determined by the judgment that the consecutive numbers of the keys of the keypad 25 and the number given to the vehicle are equal. Relay K as described above
The state of 1, K2 does not change. However, if the microprocessor U1 receives the output of EPROM U3 and the pins 1,1 of the circuit U7 during 30 seconds of one of the signals of the binarization being supplied to pin 2 by the transistor Q13.
If it determines that the continuous output signals on 7 and 18 are not equal, the microprocessor outputs a signal that changes the state of the relays KI and K2 in the procedure described above. In particular, microprocessor U1 supplies a signal via pin 6, which is connected to the base of transistor Q10 through diode D7. Transistor Q10 is forward biased to supply current to the coil of relay K1, so that the relay functions as described above.

Responsive to the signals produced by the microprocessor U1 on pins 6-8, the relays K2 and K3
Current is selectively supplied to the coil. The binary levels on pins 6-8 of the microprocessor U1 are fed to the data input pins 1-3 of the integrated circuit U5 which is configured as 3-8 decoders. Pin 11 of the decoder integrated circuit U5
To 14 are coupled to the coils of the relays K3 and K2 via the inverter of the six integrated circuit U6 and the transistors Q9 and Q11, respectively. The coils K2 and K3 respond to the data signal supplied to the pins 1 to 3 of the decoder circuit U5 having the first and second combinations, and are displaced from the normal state shown to another state at the mutual exclusion time. The pulse reacts to another combination of signals supplied to pins 1-3 of the decoder circuit U5 and is supplied by the pin 13 of the circuit U5 to the buzzer 58 via the inverter of the circuit U6.

The code signal extracted from the central master station 24 is usually demodulated and then relay K.
3 normally closed contacts supplied to pin 3 of the data decoder U14. The code signal is transmitted from the station 24 as a pulse sound having different frequencies in order to display a binary O and 1 level.

These sounds are binary 0 by the circuit U14.
It is designed to be converted into one level with this circuit U
14 takes out on the output pin 8 a binary output having the same value as the code of the alpha number character supplied to the keyboard 91. The binary level at pin 8 of circuit U14 is routed through the inverters of 6 conversion amplifiers U6 to U4,
It is supplied to pin 11 of the microprocessor U1.

First, the microprocessor U1 responds to the signal provided by the addressing EPROM U3 to the address corresponding to the serial number of the motor vehicle receiver holding the circuit element. And at the end of these, the microprocessor U1 fetches on the pins 36-43 the binary level which corresponds to the address of the EPROM U3 at which the vehicle serial number is stored. This signal is supplied to the address pins 1 to 8 of the EPROM U3 via the latch U2. Finally, (1) the pins 36-43 of the microprocessor U1 are connected to the pins 3, 4, 7, of the latch integrated circuit U2.
(2) Output pins 2, 5, 6, 9, 12, 15, 16, 1 of latch U2 connected to 8, 13, 14, 17, 18
9 is connected to pins 8 to 1 of the EPROM, and (3) the enable pin 11 of the latch is the pin 33 of the microprocessor.
(4) Pin 20 of the EPROM is connected to pin 32 of the microprocessor. Latch U2 and EPR
OMU3 responds to the signals applied to pins 11 and 20, respectively, at the mutual exclusion time so that no signal is applied to the latch while the output signal is being pulled from the EPROM. In addition, the signals are pins 9 to 17 of EPROM U3.
No signal is provided to pins 36-43 by the microprocessor while it is being pulled from. This allows the EP
The enable pins 9-17 of the ROM U3 are now able to supply binary levels to the pins 43-36 of the microprocessor U1, respectively.

The microprocessor U1 corresponds to the same serial number signal as the serial number stored in the EPROM U3 supplied to the pin 11 of the processor concerned, and the EPROM
The vehicle serial number provided by U3 is provided on pin 13 of the microprocessor. Pin 13 is also responsive to the code serial number digital signal based on the indication of security collapse and is identical to the signal read from EPROM U3 in response to driving pins 19, 22, and 23 of the EPROM. 5 is read in response to the signal supplied to it. The signal taken out on pin 13 is a 300 baud signal having a binary level consistent with the code vehicle serial number data. The 300 baud signal at pin 13 of microprocessor U1 is provided to the base of transistor Q12 through the inverter of 6-inverter network U4. The collector of the transistor Q12 is 4k
It is connected to the output pin 13 of the Hz pulse source circuit U8. As a result, the 4 kHz pulse from the circuit U8 is superimposed on the emitter of the transistor Q12 300.
The baud signal is extracted. The signal at the emitter of transistor Q12 is selectively coupled to VHF transmitter 44 via the contacts of relay K2.

The signals on pins 7, 9 and 12 of the decoder circuit U5 are the switches 39, 60 and 6 for controlling the horn, headlight and ignition of the vehicle equipped with the equipment.
4 respectively. Central master station 2
After decoding the vehicle serial number pulse transmitted from the U.S.C.4, the data decoder circuit U4 causes the microprocessor U1
The pulse applied to pin 11 of the microprocessor drives the signal at pins 7-9 of the microprocessor such that one of the binary signals is selectively applied to pins 12, 9 and 7 to control the automatic function. Control. Further, when the code signal is supplied to the pin 11 of the microprocessor U1 after reading the vehicle serial number code, the decoder U5
Produces a binary one-level signal. This signal changes the state of relay K3 and the audible amplifier in integrated circuit U11 is connected to the audio output of the UHF receiver.
The output of the audible amplifier in integrated circuit U11 sends an audible message to the speaker in the vehicle as described above.

Although one embodiment of the present invention has been described above, the present invention can be modified in various ways without departing from the scope of the claims.

[Brief description of drawings]

FIG. 1 is a block diagram of a system for locating multiple vehicles at different locations utilizing the principles of the present invention.

FIG. 2 is a block diagram of a circuit provided in a vehicle utilizing the present invention.

3 is a block diagram showing an example of a local master station provided in the system of FIG.

4 is a block diagram illustrating an example of a central master station provided in the system of FIG.

5 is a wiring diagram of a keypad transmitter included in the system of FIG.

FIG. 6 is a detailed circuit diagram of the device shown in FIG. 2 from FIGS. 6A to 6I.

[Explanation of symbols]

11, 12, 13 Automobile 14, 15, 16 Fixed Loran C transmitter 17, 18 Local transmission network 21 Fixed local master station 22, 23 Fixed relay station 24 Fixed central master station 25 Keypad 31 UHF-VHF antenna 32 Low frequency antenna 33 Door sensor 34 High voltage coil sensor 35, 38, 54, 56 Normally closed contact 36 UHF receiver 37 Keypad receiver 39 Signal processing circuit 41, 45, 49, 57, 59, 60, 64 Normally open contact 42 Speaker 43, 46,51,55,82 Lead 44 VHF transmitter 47 Power supply terminal 48 Car + 12V power supply terminal 52 Low frequency amplifier, detector 58 Buzzer 61 Car ignition circuit 62 Horn 63 Headlight 65,66 Switch 71 UHF-VHF antenna 72 VHF receiver 73 UHF receiver 74 Car serial number detector 75 Time difference detector 76, 78, 81 Bus 77 Longitude / latitude computer 79 Microprocessor 83 Telephone receiving-transmitting circuit 84 Telephone line 85 Signal information Network 91 Keyboard, Memory 92 Voice Source 93 Modem 94 Data Detector 95 Printer 96 Map Display 101-108 Keys 109 Keyboard 111 Voice Generation Integrated Circuit 112 Positive Power Terminal 113 Surface Acoustic Wave (SAW) Band Pass Filter 212 Transistor Switch

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 19, 1992

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Added

[Correction content]

[Brief description of drawings]

FIG. 1 is a block diagram of a system for locating multiple vehicles at different locations utilizing the principles of the present invention.

FIG. 2 is a block diagram of a circuit provided in a vehicle utilizing the present invention.

3 is a block diagram showing an example of a local master station provided in the system of FIG.

4 is a block diagram illustrating an example of a central master station provided in the system of FIG.

5 is a wiring diagram of a keypad transmitter included in the system of FIG.

FIG. 6 is a detailed circuit diagram of the device shown in FIG. 2 from FIGS. 6A to 6I.

6A is a circuit diagram of FIG. 6A of the circuit diagram shown in FIG. 6;
It is a more detailed circuit diagram regarding.

6B is a circuit diagram of the circuit diagram shown in FIG. 6B.
It is a more detailed circuit diagram regarding.

6C is a circuit diagram of FIG. 6C of the circuit diagram shown in FIG. 6;
It is a more detailed circuit diagram regarding.

6D is a circuit diagram of FIG. 6D of the circuit diagram shown in FIG. 6;
It is a more detailed circuit diagram regarding.

6E is a circuit diagram of FIG. 6E of the circuit diagram shown in FIG. 6;
It is a more detailed circuit diagram regarding.

6F is a circuit diagram of FIG. 6F of the circuit diagram shown in FIG. 6;
It is a more detailed circuit diagram regarding.

6G is a circuit diagram of FIG. 6G of the circuit diagram shown in FIG. 6;
It is a more detailed circuit diagram regarding.

6H is a circuit diagram of FIG. 6H of the circuit diagram shown in FIG. 6;
It is a more detailed circuit diagram regarding.

6I is a circuit diagram of FIG. 6I of the circuit diagram shown in FIG. 6;
It is a more detailed circuit diagram regarding.

[Explanation of Codes] 11, 12, 13 Automobile 14, 15, 16 Fixed Loran C transmitter 17, 18 Local transmission network 21 Fixed local master station 22, 23 Fixed relay station 24 Fixed central master station 25 Keypad 31 UHF-VHF Antenna 32 Low frequency antenna 33 Door sensor 34 High voltage coil sensor 35, 38, 54, 56 Normally closed contact 36 UHF receiver 37 Keypad receiver 39 Signal processing circuit 41, 45, 49, 57, 59, 60, 64 Normally open Contact 42 Speaker 43,46,51,55,82 Lead 44 VHF transmitter 47 Power supply terminal 48 Car + 12V power supply terminal 52 Low frequency amplifier, detector 58 Buzzer 61 Car ignition circuit 62 Horn 63 Headler Ito 65,66 Switch 71 UHF-VHF Antenna 72 VHF Receiver 73 UHF Receiver 74 Vehicle Serial Number Detector 75 Time Difference Detector 76,78,81 Bus 77 Longitude / Latitude Computer 79 Microprocessor 83 Telephone Reception-Transmission Circuit 84 Telephone Line 85 Signal Information Network 91 Keyboard, Memory 92 Voice Source 93 Modem 94 Data Detector 95 Printer 96 Map Display 101 to 108 Key 109 Keyboard 111 Voice Generation Integrated Circuit 112 Positive Power Terminal 113 Surface Acoustic Wave (SAW) Band Pass Filter 212 Transistor Switch

Claims (36)

[Claims] 1. The position of a mobile body equipped with a receiver for the low frequency radio wave is verified based on the first pulse of the low frequency radio wave transmitted from the mobile body to three stations whose locations are known in advance. The first pulse is transmitted from each of the stations at an accurate timing so that the pulses transmitted from different stations reach the mobile body with a predetermined time difference. In the method for verifying the position of a moving body, the step of receiving the first pulse of the low-frequency radio wave in the receiver on the moving body, and synchronizing with the reception time of the first pulse received by the receiver, Transmitting from the mobile body a radio frequency radio wave modulated by a second pulse having a corresponding displacement time position; Receiving the radio frequency radio wave at a remote position, and detecting the displacement time position of the second pulse based on the radio frequency radio wave received at a position distant from the moving body, A method for locating a position of a moving body, further comprising: determining a position of the moving body from the displacement time position. 2. A step of providing a communication link between a master station and each of the receivers, wherein each mobile is used for a group of mobiles having a receiver having a different serial number digital code. Selecting one of the receivers by transmitting the serial number code of the receiver via the link; and transmitting the radio frequency radio wave from the selected receiver via the link. The method of claim 1, further comprising the step of transmitting to a master station. 3. The position verification method for a moving body according to claim 2, wherein the master station detects the displacement time position and determines the position of the moving body based on the displacement time position. 4. The plurality of master stations are arranged at separate positions, and a central station is provided, and a step of establishing a communication link between the central station and the master station; 4. The method for locating a mobile unit according to claim 3, further comprising the step of transmitting the serial number digital code from the central station to the master station to determine the position of the mobile unit. 5. The mobile unit transmits the mobile unit serial number to the master station together with the second pulse, and the master station transmits the mobile unit serial number to the central station. The method for locating a moving body according to claim 4, further comprising the step of transmitting the body position together with the body position. 6. The method of claim 3, wherein the mobile unit includes a step of transmitting the mobile unit serial number together with the second pulse to the master station. 7. The mobile station transmits the mobile station serial number to the master station together with the second pulse, the master station transmitting the mobile station serial number to the central station. The method for locating a position of a moving body according to claim 2, further comprising the step of transmitting together with the body position. 8. The receiver includes a section responsive to other radio waves emitted from a source carried by a mobile operator, the other radio waves having a modulated pre-allocation code being emitted from the source. Emitting, in the section of the receiver, receiving another radio wave having a modulated pre-allocation code, to a code of the other radio wave received that is the same as the predetermined digital code of the receiver. On the basis of: setting the receiver in a first state at a predetermined interval time; setting the receiver in a second state at all other times; and during the predetermined interval time, the radio frequency radio wave. And preventing the transmission of
The method for locating a moving body described above. 9. A step of detecting the state of the mobile body, the step of transmitting the radio frequency radio wave from the mobile body based on the detected state of the mobile body and the code of the other radio wave received. 9. The method for locating a position of a moving body according to claim 8, further comprising the step of controlling. 10. A low-frequency first radio wave modulated by the first pulse and taken out by at least three sources at different positions known in advance, a signal indicating a sensing state of the moving body, and a predetermined code. And a means for reacting to another radio wave having a predetermined code for extracting the disabling signal, in a device mounted on a mobile body that transmits a second radio wave to a remote receiver. A receiver for pulses modulated to low-frequency radio waves, and a second pulse having a displacement time position corresponding to the reception time of the first pulse when received by the receiver. Means for reacting to the receiver to extract a second radio wave; the sensing status signal; and an unobtainable signal for selectively transmitting the second radio wave to the remote receiver. Apparatus characterized by comprising a means responsive to the stage. 11. The device responds to a third radio wave having a preset code, responds to a third radio wave having the code received by the mobile unit, and transmits the second radio wave. 11. The apparatus of claim 10 including means for selectively transmitting a disabling signal to the remote receiver. 12. The other radio wave is a radio wave, and a common antenna for the second, third and other radio waves, a separate receiver for the first, third and other radio waves, and the second radio wave. A transmitter for radio waves, the selective transmission means including switch means for connecting the common antenna, the separate receiver for the third and other radio waves, and the transmitter for the second radio waves, The device according to claim 11, further comprising another antenna for the first radio wave connected to a receiver for one radio wave. 13. A means for extracting a digital signal indicating a serial number, wherein the transmitting means is responsive to the serial number signal extracting means for modulating the second radio wave based on the serial number digital signal. The device according to claim 11, wherein 14. A central location station in a mobile location system for locating remotely located mobiles, wherein the mobiles are assigned serial numbers and are responsive to Loran C emissions from at least three Loran C transmitters. And a plurality of local networks, each local network including a local master station in a two-way communication link with the central station, the mobile unit each receiving on reception by the receiver. Means for receiving a Loran C emission of a pulse having a corresponding time position, synchronized with the Loran C pulse;
Responsive to the receiving means for modulating the first carrier of a frequency considerably higher than the emission, the Loran C emission, upon reception by the receiver, is synchronized with the Loran C pulse and has a pulse with a corresponding time position by radio. Said first and second carriers transmitted to a local master station in proximity to said mobile via a link, said local master station said said other set of pulses modulating said first carrier. Means responsive to the first carrier for detecting a time difference, means responsive to the time difference detecting means for determining the position of the moving body, the determined moving body position and the moving body serial number For transmitting to the central station a data signal indicating
Means for responding to a carrier, wherein the central station is responsive to the data signal for displaying the moving body position and the serial number, and an information signal including the serial number of one of the moving bodies. To the local master station, each of the local master stations comprises a receiver of the information signal and a means of modulating the second carrier to the information signal, The receiver has a means for detecting the information signal assigned to the one mobile body, and the mobile body position verification system is characterized in that. 15. The central station comprises means for outputting an audio signal, the information signal comprises the audio signal, and the moving body detects the audio signal and comprises means for supplying these auditory replicas. 15. The system of claim 14, wherein the system is: 16. Receiving means for a regional code signal indicative of the mobile body, sensor means for detecting a condition of the mobile body, and the regional means for controlling the drive of the transmitter on the mobile body. 15. The system of claim 14 including means for receiving a code signal and means responsive to the vehicle condition sensor means. 17. The sensor means includes first and second sensors for respectively detecting an opening of a door of the moving body and an operating state of an engine, for controlling driving of the transmitter on the moving body. 17. The system of claim 16 further comprising coupling outputs from the first and second sensors to an output of a receiver for the regional code signal. 18. The system comprises ignition control means, and in order to control the drive of the ignition control means,
18. The system of claim 17, wherein outputs from the first and second sensors are coupled to outputs of the receiving means for the regional code signal. 19. The mobile body comprises mobile body function control means, the central station comprises means for transmitting a data signal for control of the mobile body function control means, and the information signal comprises: Including the data signal for controlling a mobile body function control means, wherein when the mobile body is received by the mobile body receiver of the second carrier, the mobile body function control means is activated in response to the data signal. 17. The system of claim 16, comprising means for controlling and the sensor and the receiver for the regional code signal. 20. The mobile body comprises mobile body function control means, the central station comprises means for transmitting a data signal for controlling the mobile body function control means, and the information signal comprises: Including the data signal for controlling a mobile body function control means, wherein when the mobile body is received by the mobile body receiver of the second carrier, the mobile body function control means is activated in response to the data signal. 15. The system of claim 14, comprising means for controlling and the receiver for the regional code signal. 21. The system comprises relay station means coupled to the local master station, each relay station means between the first and second local master stations coupled to the relay station. 15. The system of claim 14, further comprising means for relaying the carrier of claim 1, wherein the first and second carriers are coupled between the mobile and the relay means via the wireless link. .. 22. A security system for a mobile body, comprising a code generator that emits a first radio wave encoded in the mobile body, wherein the mobile body detects a state of the mobile body,
A receiver for receiving the first radio wave, a low-frequency receiver for emitting Loran C, and means for reacting to the receiver for the first radio wave, wherein the Loran C received by the low-frequency receiver is provided. A low frequency receiver and a sensor for controlling driving states of the radio frequency transmitter are provided so that the pulse replica selectively modulates the radio frequency radio wave transmitted by the radio frequency radio wave transmitter. Security system characterized by. 23. A receiver for radio frequency radio waves in which the mobile has a modulated mobile serial number code, and a replica of the Loran C pulse received by the low frequency receiver is the radio frequency radio transmitter. Means for detecting the serial number code and controlling the drive of the radio frequency transmitter so as to selectively modulate the radio frequency radio wave transmitted by the radio frequency radio wave receiver. 3. The method according to claim 2, wherein
The security system described in 2. 24. Means for modulating the radio frequency radio wave transmitted by the radio frequency radio wave transmitter with a mobile body serial number each time the mobile body modulates the radio frequency radio wave by the replica of the Loran C pulse. The security system according to claim 23, further comprising: 25. Means for modulating the radio frequency radio wave transmitted by the radio frequency radio wave transmitter with a mobile body serial number each time the mobile body modulates the radio frequency radio wave by the replica of the Loran C pulse. The security system according to claim 22, further comprising: 26. The security system according to claim 22, wherein the sensor means includes a sensor that detects whether or not the door of the moving body is open. 27. The security system according to claim 22, wherein the sensor means includes a sensor that detects whether or not the engine of the moving body is operating. 28. The sensor means includes a sensor for detecting whether or not the door of the moving body is open, and both of the sensor means are coupled to control the operation of the radio frequency transmitter. 28. The security system according to claim 27, wherein: 29. A receiver for a radio wave modulated with a replica of a code signal and a Loran C pulse indicating a serial number of the mobile when received by the mobile, and calculating the position of the mobile. In order to do so, means for reacting to the replica of the Loran C pulse, and a radio wave that is responsive to the code signal and includes a code signal indicating the mobile unit serial number and a signal indicating the calculated mobile unit position are transmitted to the central station. A local master station, characterized in that the local master station is provided with a means for performing an arithmetic operation. 30. The apparatus according to claim 28, further comprising means for reacting to a transmission indicating a mobile unit serial number from the central station, and means for transmitting a radio wave modulated by the mobile unit serial number. The listed local master station. 31. Means for indicating a mobile unit serial number from the central station and for responding to a transmission including a voice message; and means for transmitting a radio wave modulated by the mobile unit serial number and the voice message. 30. The local master station of claim 29, further comprising: 32. A low-frequency first radio wave modulated by the first pulse and taken out by at least three sources at different positions known in advance, a signal indicating a sensing state of the moving body, and a predetermined code. In a device for mounting on a moving body which transmits a second radio wave to a remote receiver in response to another radio wave having a pulse, a first receiver for a pulse modulated to a low frequency first radio wave, A second receiver for radio waves, and the first and second radio waves for extracting the second radio wave.
And a second pulse having a displacement time position corresponding to the reception time of the first pulse when the second radio wave is received by the first receiver. And a digital representation of the mobile serial number. 33. The other radio wave is a third radio wave including first and second components, the first component being modulated by a first signal indicating data for instructing a function of the moving body,
The component is modulated by a second signal indicating the serial number of the moving body, first means for detecting the first signal, second means for detecting the second signal, and the first and second detections. 33. Means for controlling the function of a mobile body based on a signal detected by the means. 34. The second receiver receives a fourth radio wave having a frequency displaced from the third radio wave, and the fourth radio wave is modulated by a double audible signal indicating another certification code of the mobile body. The device controls the second means for supplying the second radio wave based on the third means for detecting the modulation of the fourth radio wave and the signals detected by the second and third means. 34. The apparatus of claim 33, comprising: 35. A common antenna for the second, third, and fourth radio waves, a separate receiver for the first, third, and fourth radio waves, a transmitter for the second radio waves, and a third antenna. Switch means for connecting the common antenna and the separate receiver for the transmitter of the fourth radio wave and the second radio wave, and other for the first radio wave connected to the receiver for the first radio wave 35. The device of claim 34, further comprising: 36. The other radio wave is a third radio wave modulated by a dual frequency audible signal indicating a certification code of the moving body, and the device detects the modulation of the third radio wave. 33. The device according to claim 32, further comprising means for controlling the second radio wave supply means based on a signal detected by the means for detecting modulation of the third radio wave.