JPH06131590A - Device for identifying mobile body - Google Patents

Abstract

PURPOSE:To provide a mobile body identifying device capable of ending communication only by one communication sequence even for a responder moving at a high speed. CONSTITUTION:When a responder 10 enters the beam area of a questioner 20 and receives a start command, a start response is transmitted to the questioner 20. At the time of receiving the start response, the questioner 20 transmits an operation command. The responder 10 receiving the operation command executes a prescribed operation and then returns an operation response. After tarnsmitting the operation response, the responder 10 receives an end command indicating the end of a series of communication sequence and is turned to a reception inhibiting state for a prescribed time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving body identifying apparatus.

[0002]

2. Description of the Related Art Generally, a moving body identifying apparatus is provided with an interrogator arranged at a fixed position and a responder attached to a moving body or the like.
It is an effective device for managing information such as specifications of individual products, processing, and inspections in processes such as payout. The moving body identification device is used for transportation, distribution, etc. in addition to the production line, and can also be used for a toll road toll collection system.

The transponder of this type of moving body identifying apparatus is also called a data carrier, and usually has a sealed structure in which an antenna, a transmitting / receiving section and the like are built in, and is attached to a moving body.

When the moving body identification device is applied to a toll road toll collection system or a system for accessing data with a responder provided for a high-speed moving object, the responder is placed in the beam area of the interrogator at an arbitrary timing. Since the vehicle enters at high speed, the interrogator repeats the same operation by the continuous auto read / write method.

The continuous auto read / write method will be described below with reference to FIG.

The interrogator transmits an activation command to the transponder that has entered the beam area, and the transponder responds to this by sending an activation response back to the interrogator. When the interrogator receives this activation response, the interrogator knows that the transponder is within the beam area. Next, when the interrogator transmits the operation command, the responder that receives the operation command returns an operation response, which is the execution result after the operation is executed, to the interrogator. When the interrogator receives the operation response, the interrogator knows the end of execution by this, sends an end command to the responder, and ends the series of communication sequences.

[0007]

In such a continuous auto read / write method, in order for the interrogator to access the transponder that quickly enters the beam area at an arbitrary timing, the start command is issued until the start response is received. Must be transmitted repeatedly at regular intervals. In other words, in a system that accesses data at high speed and at any timing in the interrogator's beam area, the communication sequence from the start command to the end command is repeated multiple times within the same beam area in order to complete the operation normally. Design with plenty of room for execution.

In this case, once the operation is completed normally, the second and subsequent operations with the same responder become unnecessary. But,
The current design produces corresponding multiple results for performing multiple operations, especially the last operation with the same transponder, causing the transponder to move out of the beam area during operation, resulting in There is a problem that it becomes abnormal.

Therefore, the present invention provides a mobile body identification apparatus which terminates communication in a single communication sequence even for a transponder moving at high speed.

[0010]

According to the present invention, there is provided a transponder and an interrogator that communicates with a transponder that passes through a beam area via a non-contact transmission medium. Provided is a mobile body identification device including means for setting a reception prohibited state for a predetermined time after receiving an end command indicating the end of a series of communication sequences transmitted from a device.

[0011]

When the transponder normally enters the beam area of the interrogator and receives a start command from the interrogator, the transponder executes a series of communication sequences with the interrogator. When the end command indicating the end of the communication sequence is received from the interrogator, the responder sets the communication with the interrogator to the reception prohibited state for a predetermined time.

This predetermined time is specifically longer than the time required for the transponder to normally complete one communication sequence and move out of the interrogator's beam area. As a result, even if the activation command is received from the interrogator again, 2
The communication sequence after the first time is not performed.

[0013]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a flow chart showing an example of a communication sequence on the responder side of an embodiment of the moving body identifying apparatus according to the present invention, and FIG. 2 is an example of a communication sequence on the interrogator side corresponding to FIG. It is a flowchart figure shown. FIG. 3 is a block diagram schematically showing the structure of a transponder and an interrogator of an embodiment of the moving body identifying apparatus according to the present invention.

As shown in FIG. 3, the transponder 10 includes an antenna 11, a transceiver 12, and a ROM (Read Only Memory) 1.
3, a RAM (random access memory) or a non-volatile storage memory 14, a power supply 15, and a CPU 16. The antenna 11 is connected to the CPU 16 via the transceiver 12, and the ROM 13, the RAM 14, the power supply 15,
And the CPU 16 are connected to each other. In the ROM 13, a reception prohibited time for prohibiting reception is recorded.

The transceiver 12 is connected to the CPU 16. The transceiver 12 has a function of demodulating the modulated microwave transmitted from the interrogator 20 received through the antenna 11 and digitally modulating the non-modulated wave received from the interrogator 20 according to the data to be transmitted. Have.

The ROM 13 generally stores a system program for controlling the operation of the responder 10, and R
The AM 14 stores data such as an ID code for distinguishing oneself from the other.

As the antenna 11, for example, a rectangular patch antenna that also serves as transmission and reception is used.

The interrogator 20 includes an antenna 21 and a transceiver 2.
2, the ROM 23, the RAM 24, the power supply 25, the I / O interface 26, and the CPU 27. The antenna 21 is connected to the CPU 27 via the transceiver 22, and the ROM 23, the RAM 24, the power supply 25, and the I / O interface 26. , And the CPU 27 are connected to each other.

The transmitter / receiver 22 has a function of transmitting various commands via the antenna 21 and then transmitting unmodulated microwave to read a response and data from the responder 10. That is, the modulated wave including the response and data returned from the responder 10 is received and demodulated. Further, the transmitter / receiver 22 has a function of modulating the microwave according to the information transmitted to the responder 10. The antenna 21 is usually
An array antenna in which a plurality of square patch antennas are arranged is used for improving directivity and supporting long-distance communication.

The interrogator 20 is an I / O interface 2
A data processing terminal 30 such as a personal computer or a programmable controller is connected via 6.

A system program for controlling the operation of the interrogator 20 is stored in the ROM 23, and data and the like are stored in the R
It is stored in the AM 24. The ID code added to the activation response or the like from the transponder 10 is stored in the RAM 24.

Next, a flow of an example of a communication sequence between the responder and the interrogator will be described with reference to FIGS.

As shown in FIG. 1, the transponder determines whether or not an activation command is received from the interrogator (step S).
10). Normally, the responder in the standby state receives the activation command when it enters the beam area of the interrogator, and the step S
At 10 the standby state is released. Then, it is determined whether or not there is a transmission error by transmission error detection such as sum check or parity check, that is, the validity of the command is determined (step S11), and if there is a transmission error, step S10 is executed again. . If there is no transmission error, a start response is transmitted to the interrogator (step S12). Next, it is determined whether or not an operation command is received (step S1
3) If the operation command is not received, step S13 is repeated until it is received. When the operation command is received, it is judged whether or not a transmission error is detected (step S14), and if there is a transmission error, step S13 is executed again.

If the result of step S14 shows that the transmission is normally performed, the responder executes the designated operation and sends an operation response to the interrogator (step S15). Next, it is determined whether or not an end command indicating that a series of communication sequence processing has ended is received from the interrogator (step S16). If you receive this,
The process ends as if normal communication had ended. If the end command is not received, step S16 is repeated until the end command is received. However, the end command is not always received, and it is determined whether or not a predetermined fixed time has elapsed (timed out). In step S17), if the predetermined time has elapsed, the next reception inhibition process is performed.

In the reception prohibition process, first, it is judged whether or not the reception prohibition mode is set (step S1).
8) If it is in the reception prohibition mode, set the reception prohibition time to RA
It is read from M and the timer is started, and it is determined whether the reception prohibited time has elapsed (step S1).
9). When the reception prohibition time has elapsed, the series of communication sequences ends.

On the other hand, as shown in FIG. 2, the interrogator transmits an activation command to the responder in the beam area (step S20). Next, it is determined whether or not the activation response with the ID code is received (step S2
1). If the determination result is negative, step S20 is repeated until the transponder enters the beam area of the interrogator and receives the activation response. Step S21
If the activation response is received in step S2, it is determined whether or not there is a transmission error by the transmission error detection (step S2).
2) If there is a transmission error, execute step S20 again.

If there is no transmission error and normal communication is performed, the interrogator transmits an operation command to the responder (step S23). Next, it is determined whether or not an operation response, which is an execution result after the operation is executed, is received from the responder (step S24), and if there is no operation response, step S24 is repeated until the operation response is received. Then, it is judged whether or not a transmission error is detected (step S25), and if there is a transmission error, the step S is performed again.
23 is executed.

If there is no transmission error and normal communication is performed, the interrogator transmits an end command to the responder (step S26) and determines whether or not there is a stop instruction (step S26). S27), if there is no stop instruction, step S2
Returning to 0, the communication sequence process is repeated for other responders. On the other hand, if there is a stop instruction, the process is stopped.

As described above, according to the present embodiment, since the transponder which has normally ended is in the reception prohibited state for a certain period of time, it is necessary to receive the activation command for starting the communication sequence while in the beam area. Instead, it is possible to prohibit the communication sequence operation with the same responder a plurality of times within the same beam area.

In the above embodiments, the microwave system is used as the transmission medium system, but the transmission medium system is not limited to this, and an electromagnetic coupling system, an electromagnetic induction system, an optical communication system or the like may be used.

Next, an embodiment in which the moving body identifying apparatus according to the present invention is applied to a system for identifying an actually moving moving body will be described.

FIG. 4 is a route diagram of a moving body for explaining a moving body identifying system to which the moving body identifying apparatus according to the present invention is applied. In FIG. 4, as a route from the entrance point (interchange) 51 to the exit point 53, route A50 (entrance point 51 → A transit point 52 → exit point 5)
3) and route B54 (entrance point 51 → B waypoint 55 →
There are two ways, exit point 53). Interrogator is 5 at each point
1, 52, 53 and 55, respectively.

As shown in Table 1, the data stored in the RAM of the responder 10 provided in the moving body moving on this route is the unique data (I
D code, expiry date), entrance data (entrance point code, moving object type code) registered at the entrance point, via data (via point code) registered at the via point, and exit data (exit point) registered at the exit point Code, mobile type code, route usage data). Table 1 shows Route B
It is an example of the process at the exit point of the moving body passing through 54.

As described above, the interrogator repeatedly transmits the activation command in order to detect that the transponder attached to the moving body that comes in at an arbitrary timing exists in the beam area. Upon receiving the activation command, the transponder analyzes the activation command and knows that it has entered the beam area, and further determines that it is an exit point process. Then, unique data (ID code: 123456, expiration date: December 10, 1995), entrance point code which is the entrance data: A111, type code of the moving body: 01 (type such as size of the moving body), and The route data is the route data, and the route point code: C333 indicating the B route point 55 is returned as the activation response.

[0036]

[Table 1]

Next, the interrogator, which has received the activation response including the unique data, the entrance data, and the transit data, to which the ID code: 123456 is added, judges that the new moving body is passing through the exit point. , After the expiration date (December 20, 1995) and the ID code (123456) are determined to be valid, the entry point code of the entry point: A1
11, waypoint code: C333, and type code: 0
From 1, the route usage data is calculated as 2400. Then, the exit point code: D444, the type code: 01, and the route use data: 2400, which are the exit data, are transmitted to the responder as operation commands. The responder receiving the operation command sends the exit data (exit point code: D444, type code: 01, route use data: 2400) to RA.
Register in M and return operation response. The interrogator that receives the operation response sends an end command to the responder, and the responder receives the end command and the communication sequence ends.

Upon receiving the end command, the transponder, which knows the end of the operation, reads out the reception prohibition time: 40 seconds of the exit registered in the RAM and enters the reception prohibition state for 40 seconds.

On the other hand, the interrogator repeatedly transmits the start command to transmit the next moving mobile unit after transmitting the end command. At this time, the transponder whose communication has already ended normally is in the beam area. Even in the inside, since the reception is prohibited while passing through the beam area (40 seconds in this example), the same operation does not occur multiple times in the same beam area.

As described above, since the transponder is in the reception prohibited state after the communication is normally completed, the interrogator provided at each point in the mobile identification system and the response that passes through this beam area at high speed. It is possible to prohibit the communication with the device from operating multiple times.

The mobile body identification device can also be applied to a toll road toll system. In this case, the moving body is read as the vehicle, the identification code as the vehicle code, and the route usage data as the usage amount. When applied to a toll road toll collection system, the waypoint code can be recorded in the transponder, so that the route of use of the transponder can be specified and the exact amount of use can be collected. Also in this case,
The transponder may be a prepaid system in which the usage fee is paid in advance or a post-paid system in which the usage fee is paid later.

[0042]

As described in detail above, the moving body identifying apparatus according to the present invention comprises a transponder and an interrogator that communicates with a transponder that passes through the beam area via a non-contact transmission medium. Since the transponder includes a means for setting the reception prohibited state for a predetermined time after receiving the end command indicating the end of the series of communication sequences transmitted from the interrogator, the transponder includes the end transmitted from the interrogator. When the command is received, the reception is prohibited for a predetermined time, and the communication process is prohibited. Therefore, the transponder does not perform the same operation more than once in the same beam area, and it is possible to prevent the occurrence of communication abnormality due to a plurality of operations.

[Brief description of drawings]

FIG. 1 is a flowchart showing an example of a communication sequence on a transponder side of an embodiment of a mobile unit identifying apparatus according to the present invention.

FIG. 2 is a flow chart diagram showing an example of a communication sequence on the interrogator side of the embodiment of the mobile unit identifying apparatus according to the present invention.

FIG. 3 is a block diagram showing a schematic configuration of an embodiment of a moving body identifying apparatus according to the present invention.

FIG. 4 is an explanatory diagram showing an embodiment in which the mobile body identification device according to the present invention is applied to a toll road.

FIG. 5 is an explanatory diagram showing an outline of a communication sequence of a conventional mobile body identification device.

[Explanation of symbols]

 10 Responder 11, 21 Antenna 12, 22 Transceiver 13, 23 ROM 14, 24 RAM 15, 25 Power Supply 16, 27 CPU 20 Interrogator 26 I / O Interface 30 Data Processing Terminal

Front page continuation (51) Int.Cl. ⁵ Identification number Office reference number FI Technical indication location H04B 5/00 Z 7117-5K 7/26 J 9297-5K (72) Inventor Kazuo Fukasawa Sachi-ku, Kawasaki City, Kanagawa Prefecture 70 Yanagimachi Yanagimachi Factory, Toshiba Corporation

Claims (1)

[Claims] 1. A response device, and an interrogator that communicates with a transponder that passes through a beam area via a non-contact transmission medium, the response device transmitting a series of communications from the interrogator. A moving body identifying apparatus comprising means for setting a reception prohibited state for a predetermined time after receiving an end command indicating the end of the sequence.