RU2212711C2 - Device for guard alarm with remote radio communication - Google Patents

Abstract

FIELD: radio engineering, applicable for protection against thefts of automobile transport, individual garden plots, as well as for protection of compartments against a break-up and fire alarm. SUBSTANCE: the device has a transmitting station and a receiving station. The transmitting station has a unit of transmitters, reference generator, source of discrete messages, phase manipulator, source of analog messages, amplitude modulator, transmitter and a transmitting antenna. The receiving station has a receiving antenna, receiver, spectrum analyzers, phase doubler, comparison unit, key, amplitude limiter, synchronous detector, AF signal amplifier, acoustic radiator, delay line, phase detector and a recording unit. EFFECT: enhanced true information for the guard alarm with a remote radio information for the guard alarm with a remote radio communication by using complex signals with a combination amplitude modulation and phase manipulation (AM-PhM). 11 dwg

Description

 The device relates to the field of radio engineering and can be used to protect against theft of automobile vehicles, individual garden houses, as well as to protect against breaking into apartments and fire alarms.

 Known devices for fire alarm (ed. Certificate of the USSR 339.928, 386.416, 571.821, 788.136, 824.252, 924.735, 1.117.673, 1.661.815, 1.730.648, 1.783.561, 1.836.707; RF patent 2.054.690 ; US patents 4.023.163, 4.751.499, 5.281.953; Great Britain patent 2.269.970; German patent 4.242.973; Japanese patent 5-52.999 and others).

 Of the known devices, the closest to the proposed one is the "Device for burglar alarm with remote radio communications" (ed. Certificate of the USSR 1.730.648, G 08 B 13/08, 1990), which is selected as a prototype.

 This device provides an alarm system for opening or stealing cars and their effective detection, as well as protection against hacking of individual garden houses and a fire alarm. The device, if it is necessary to protect at the same time many objects, also provides high efficiency in the use of the frequency range, as it allows for the protection of many objects to use a radio channel of the same frequency, for example, the frequency fc = 26.945 kHz, allocated for remote security alarm.

 An object of the invention is to increase the information content of a security alarm device with remote radio communications by using complex signals with combined amplitude modulation and phase shift keying (AM-FMN) on the same carrier frequency.

 The problem is solved in that in a device containing a transmitting station, including a sensor unit, to the first output of which a reference generator is connected, and a transmitter, to the output of which a transmitting antenna is connected, a receiving station containing a receiver, to the input of which a receiving antenna is connected, and sequentially the connected audio signal amplifier and acoustic emitter, a discrete message source, a phase manipulator, an analog message source and an amplitude module are introduced at the transmitting station or, moreover, a phase manipulator is connected in series to the output of the reference generator, the second input of which is connected to the second output of the sensor unit via a discrete message source, an amplitude modulator, whose second input is also connected to the second output of the sensor unit through an analog message source, and a transmitter, the second input of which connected to the second output of the sensor unit, at the receiving station a phase doubler, two spectrum analyzers, a comparison unit, a key, a synchronous detector, an amplitude limiter, a delay line, a phase detector and a recording unit, and a phase doubler, a second spectrum analyzer, a comparison unit, the second input of which is connected to the output of the receiver through a first spectrum analyzer, a key, the second input of which is connected to the output of the receiver, an amplitude limiter and a synchronous detector, are connected to the output of the receiver, the second input of which is connected to the key output, and the output is connected to an audio signal amplifier, the delay line, phase detector, W are connected in series to the output of the amplitude limiter swarm input of which is connected to the output of the amplitude limiter, and a recording unit.

 The structural diagram of the proposed device is presented in figure 1. Timing diagrams explaining the principle of operation of the device shown in figure 2.

 A security alarm device with remote radio communication comprises a transmitting station 1 and a receiving station 10.

 The transmitting station 1 contains a series-connected sensor block 2, a reference oscillator 3, a phase manipulator 5, the second input of which is connected through the source 4 of discrete messages to the second output of the sensor block 2, an amplitude modulator 7, the second input of which is connected to the second output through the source of analog messages 6 block 2 sensors, the transmitter 8, the second input of which is connected to the second output of the block 2 sensors, and a transmitting antenna 9.

 The receiving station 10 comprises a receiving antenna 11 connected in series, a receiver 12, a phase doubler 14, a second spectrum analyzer 15, a comparison unit 16, the second input of which is connected through the first spectrum analyzer 13 to the output of the receiver, a key 17, the second input of which is connected to the output of the receiver 12 , an amplitude limiter 18, a synchronous detector 19, the second input of which is connected to the output of the key 17, an amplifier 20 of audio signals and an acoustic emitter 21. A delay line is connected in series to the output of the amplitude limiter 18 22, a phase detector 23, the second input of which is connected to the output of the amplitude limiter 18, and the registration unit 24.

 The device operates as follows.

 In the initial state, in the absence of an alarm situation in the transmitting station 1 at the outputs of the sensor unit 2, the potential is low logic level, the transmitter 8 is turned off.

 In the event of an alarm situation recorded by at least one of the sensors (for example, installed on the doors, hood and trunk of the car) of the sensor unit 2, a high logical level potential is established at its outputs, which allows the operation of the reference generator 3, source 4 of discrete messages, source 6 analog messages and transmitter 8.

When this reference generator 3 generates high-frequency oscillations (Fig.2, a)
Uc (t) = Vc • cos (Wc • t + φc), 0≤t≤Tс,
where Vc, Wc, φc, Tc - amplitude, carrier frequency, initial phase and duration of high-frequency oscillations;
which go to the first input of the phase manipulator 5, to the second input of which a modulating code M (t) is supplied from the input of the source 4 of discrete messages (Fig. 2, b). At the output of the phase manipulator 5, a phase-shift (PSK) signal is generated (Fig. 2, c)
U _I (t) = Vc • cos • [Wct + φk (t) + φc], 0≤t≤Tс.

where φk (t) = {0, π} is the manipulated phase component that displays the phase manipulation law in accordance with the modulating code M (t) (Fig. 2, b), and φk (t) = const for Kτе <t <( K + 1) τэ and can change stepwise at t - Kτэ, i.e. at the borders between elementary premises (K = 1,2, .... N-1);
τe, N is the duration and number of chips that make up the signal with a duration of Tc (Tc = Nτe),
which is fed to the input of the amplitude modulator 7. The modulating function m (t) of the amplitude modulation (Fig. The output of the amplitude modulator 7 produces a complex signal with combined amplitude modulation and phase shift keying (AM-PSK) (figure 2, e)
U ₂ (t) = Vc • [l + m (t)] • cos • [Wct + φк (t) + φc], 0≤t≤Tc,
where m (t) is the modulating function of the amplitude modulation, providing the transmission, for example, of the following voice information: "Car theft of VAZ 2108, color yellow, license plate D0613 LD".

в котором фазовая манипуляция уже отсутствует. Ширина спектра сложного АМ-ФМН-сигнала определяется длительностью τэ его элементарных сигналов Δfc = l/τэ. Тогда как ширина спектра его второй гармоники U₃(t) определяется длительностью сигнала Тc(Δf₂=1/Тc). Следовательно, при умножении фазы на два сложного АМ-ФМН-сигнала его спектр сворачивается в N раз
Δfc/Δf₂ = N.
Это обстоятельство позволяет обнаружить и отселектировать сложный АМ-ФМН-сигнал среди других сигналов и помех.The specified signal after amplification in the transmitter 8 is transmitted by the transmitting antenna 9 to the air, and then the receiving antenna 11 of the receiving station 10 is captured. From the output of the receiver 12, the received AM-FMN signal is fed to the input of the phase doubler 14, at the output of which a voltage is generated

in which phase manipulation is already absent. The spectrum width of a complex AM-FMN signal is determined by the duration τe of its elementary signals Δfc = l / τe. Whereas the width of the spectrum of its second harmonic U ₃ (t) is determined by the signal duration Tc (Δf ₂ = 1 / Тc). Consequently, when the phase is multiplied by two complex AM-FMN signals, its spectrum collapses N times
Δfc / Δf ₂ = N.
This circumstance makes it possible to detect and select a complex AM-FMN signal among other signals and interference.

The spectrum width Δfc of a complex AM-FMN signal is measured using a spectrum analyzer 13, and the spectrum width Δf _{2 of} its second harmonic is measured using a spectrum analyzer 15. The voltages V ₁ and V ₂ are proportional to Δfc and Δf _2, respectively, from the outputs of the spectrum analyzers 13 and 15 enter the two inputs of block 16 comparison. If two inputs of the comparison unit 16 receive approximately the same voltage intensity, then there is no voltage at its output. If two inputs of the comparison unit 16 receive different voltages in intensity, then a constant voltage appears at its output.

Since V ₁ >> V ₃ , then at the output of the comparison unit 16, a constant voltage is generated, which is supplied to the control input of the key 17, opening it. In the initial state, the key 17 is always closed.

In this case, the received AM-FMN signal from the output of the receiver 12 through the public key 17 is fed to the information input of the synchronous detector 19 and to the input of the amplitude limiter 18, the output of which is a phase-shifted signal (Fig. 2, e)
U ₄ (t) = V ₀ • cos • [Wct + φк (t) + φc], 0≤t≤Tс,
where V ₀ is the limit threshold.

This signal is used as a reference voltage and is supplied to the reference input of the synchronous detector 19. At the output of the latter, a low-frequency voltage is generated (figure 2, g)
U _H1 (t) = V _H1 • [1 + m (t)],
where U _H1 = 1 / 2K ₁ V _c • V ₀ ;
K ₁ - gear ratio of the synchronous detector,
which is amplified by the power of the amplifier 20 of the audio frequency signals and is fed to an acoustic emitter 21, for example a loudspeaker that provides listening to the speech information signal: "Car theft VAZ 2108, color yellow, license plate up to 613 LD".

который используется в качестве опорного напряжения и подается на опорный вход фазового детектора 23. Фазовый детектор 23 и линия задержки 22 реализуют метод относительной фазовой демодуляции, в котором опорным напряжением для каждой последующей посылки служит предыдущая элементарная посылка. На выходе фазового детектора 23 образуется низкочастотное напряжение (фиг.2, и)
U_H2(t)=V_H2•cosφK(t).At the same time, the PSK signal from the output of the amplitude limiter 18 is fed to the input of the delay line 22 and to the information input of the phase detector 23. The delay time τz of the delay line 22 is selected equal to the duration of the elementary packets τz (τz = τe) (Fig. 2, h). An output FMN signal is generated at the output of the delay line 22

which is used as the reference voltage and is supplied to the reference input of the phase detector 23. The phase detector 23 and the delay line 22 implement the method of relative phase demodulation, in which the previous elementary packet serves as the reference voltage for each subsequent transmission. The output of the phase detector 23 is formed of a low-frequency voltage (figure 2, and)
U _H2 (t) = V _H2 • cosφK (t).

where U _H2 = 1 / 2K ₂ • V _s • V ₀ ² ;
K ₂ - the transfer coefficient of the phase detector,
which is fixed by the registration unit 24.

 The specified voltage in a discrete form contains information, for example, about the owner of the specified car and other detailed passport information about the car.

 The device can be used to simultaneously protect a group of individual houses from fire or burglary. At the same time, in the transmitting stations installed in the guarded houses, in the sources of discrete and analog messages, codes and voice information about the address of the guarded house and the nature of the controlled alarm situation (fire, breaking) should be recorded, and the receiving station at the checkpoint can be one, since when receiving a complex signal with combined amplitude modulation and phase shift keying (AM-FMN) it allows you to listen to voice information about the address of the corresponding guarded house, the nature of the alarm and detailed pass ortnye information about the owners of the protected building.

 High information content and the availability of remote radio communications determine the feasibility of widespread use of the device for the protection of mobile objects, such as cars. At the same time, the completeness of information about the protected mobile object embedded in the transmitted complex signal with combined amplitude modulation and phase shift keying, the frequency of transmission of information signals provide the possibility of quick identification of the moving object and its detection.

 So, for example, when equipping posts or operatives of the traffic police with simple, and therefore small-sized, wearable receiving stations, any of the vehicles equipped with a transmitting station ensures automatic transmission of information about the brand, color, license plate and passport information of this car and its owner, can be quickly detected and delayed.

 The advantage of the device is also the high efficiency of using the frequency range, since a radio channel of the same frequency can be used to protect many objects.

 Thus, the proposed device in comparison with the prototype and other technical solutions for a similar purpose provides an increase in the information content of security alarms with remote radio communications. This is achieved by using complex signals with combined amplitude modulation and phase shift keying (AM-FMN) on the same carrier frequency.

 From the point of view of detection, these signals have high energy and structural secrecy.

 The energy secrecy of complex AM-FMN signals is due to their high compressibility in time or spectrum with optimal processing, which reduces the instantaneous radiated power. As a result, a complex AM-FMN signal at the receiving point may be masked by noise. Moreover, the energy of a complex AM-FMN signal is by no means small; it is simply distributed over the time-frequency domain so that at each point in this region the signal power is less than the noise power.

 The structural secrecy of complex AM-FMN signals is caused by a wide variety of their forms and significant ranges of parameter values, which makes it difficult to optimally or at least quasi-optimally process complex AM-FMN signals of an a priori unknown structure in order to increase the sensitivity of the receiver.

 Complex signals with combined amplitude modulation and phase manipulation allow you to apply a new type of selection - structural selection. This means that there is a new opportunity to separate signals operating in the same frequency band and at the same time intervals. Fundamentally, you can abandon the traditional method of dividing the operating frequencies of the used range between operating radio stations and selecting them on the receiving side using frequency filters. It can be replaced by a new method based on the simultaneous operation of each radio station in the entire frequency range with complex AM-FMN signals, with the radio receiving device highlighting the signal of the necessary radio station through its structural selection.

Claims (1)

 A security alarm device with remote radio communication, comprising a transmitting station, including a sensor unit, to the first output of which a reference generator is connected, and a transmitter, to the output of which a transmitting antenna is connected, a receiving station containing a receiver, to the input of which a receiving antenna is connected, and series-connected an audio signal amplifier and an acoustic emitter, characterized in that a discrete message source, a phase manipulator, and sources are introduced into it at the transmitting station analog messages and an amplitude modulator, and a phase manipulator is connected in series to the output of the reference generator, the second input of which is connected to the second output of the sensor unit via a discrete message source, an amplitude modulator, whose second input is also connected to the second output of the sensor unit through an analog message source, and a transmitter , the second input of which is connected to the second output of the sensor unit, at the receiving station a phase doubler, two spectrum analyzers, a comparison unit, a key, a synchronous detector, an amplitude limiter, a delay line, a phase detector and a registration unit, and a phase doubler, a second spectrum analyzer, a comparison unit, the second input of which is connected to the output of the receiver through a first spectrum analyzer, a key, the second input of which is connected to the output of the receiver, an amplitude limiter and a synchronous detector, the second input of which is connected to the key output, and the output is connected to an amplifier of audio signals, to the output of the amplitude limiter is connected in series cheny delay line, phase detector, a second input coupled to an output of the amplitude limiter, and a recording unit.

Images