RU2373082C1 - Venicle anti-theft device - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: device processes complex phase-manipulated signals and comprises transmitter mounted on control post, receiver, actuator and passive transponder mounted on vehicle. Transmitter comprises master generator, modulating code generator, phase manipulator, power amplifier, transceiver antenna, duplexer, HF amplifier, heterodyne, two intermediate frequency amplifiers, three multiplexers, bandpass filter, phase detector, computer, two LF filters, two extremal regulators, two controlled lad units, range indicator, angle indicator, two frequency doublers, two frequency halvers, two narrow-band filters, phase metre, receiving antenna and two HF amplifiers. Receiver comprises antenna, HF amplifier, two spectrum width meters, frequency doubler, comparator, two threshold units, key, frequency halver, narrow-band filter, phase detector, unipolar gate, accumulator, heterodyne, mixer and intermediate frequency amplifier. Actuator comprises storage battery, ignition switch, ignition coil, two relays, key, control switch, threshold unit, four indicator lamps, horn, thyristor and time lag unit. Transponder comprises piezo crystal, strip antenna, system of electrodes, two buses and reflectors.

EFFECT: expanded performances, remote location of stolen vehicle.

5 dwg

Description

The proposed device relates to transport equipment, in particular to devices for preventing unauthorized use or theft of vehicles using a radio channel.

Anti-theft devices using a radio channel are known (for example, RF patents No. 2006394, 2011574, 2011575, 2021927, 2033352, 2033353, 2042548, 2058906, 2061320, 2061321, 2061323, 2254245, 2302953; Dikarev V.I., Zhurkovich V.V., Rybkin L.V., Sergeeva V.G. Protection of vehicles and cargo from theft and theft.Edited by Doctor of Technical Sciences V.V. Zhurkovich. From the "Humanism", St. Petersburg, 2004, p. .103-240 and others).

Of the known devices, the closest to the proposed one is "Anti-theft device for a vehicle" (RF patent No. 2302953, B60R 25/04, 2006), which is selected as a prototype.

The specified device provides remote search and detection of a stolen vehicle located in the general traffic stream, and its detention, or being in a static de-energized state in a parking lot, in a garage or just outside.

However, the known device does not provide remote location of the stolen vehicle.

An object of the invention is to expand the functionality of the device by remotely locating a stolen vehicle.

The problem is solved in that the anti-theft device for the vehicle, containing, in accordance with the closest analogue, a transmitter installed at the control station and consisting of a serially connected master oscillator, a phase manipulator, the second input of which is connected to the output of the modulating code generator, power amplifier, duplexer the input-output of which is connected to a transceiver antenna, a second high-frequency amplifier, a second mixer, the second input of which is connected to the output of the second getter one, a second intermediate frequency amplifier, a first multiplier, the second input of which is connected to the output of the master oscillator, a bandpass filter, a second phase detector, the second input of which is connected to the output of the second local oscillator, and a computer, a receiver mounted on the vehicle and consisting of the first connected in series a receiving antenna, a first high frequency amplifier, a first mixer, the second input of which is connected to the output of the first local oscillator, the first intermediate frequency amplifier, the first double a frequency amplifier, a second spectral width meter, a comparison unit, the second input of which through the first spectral width meter is connected to the output of the first intermediate frequency amplifier, the first threshold block, the second key, the second input of which is connected to the output of the first intermediate frequency amplifier, the first phase detector, the second whose input is connected through a series-connected first frequency divider into two and a first narrow-band filter connected to the output of the first frequency doubler, unipolar valve, drive and second of the first threshold block mounted on the vehicle, the first and second relays, the first made with the closing and opening, and the second with the closing contacts, the winding of the first of which is connected to the vehicle’s battery through the ignition switch, and one of the contacts is connected to the ignition coil circuit, a time delay unit, a thyristor, included in the power supply of the sound signaling device parallel to the switch of the sound signaling device and connected by a control electrode to the output of the time delay unit, p The first key is connected in series with the winding of the first relay, the control switch and signal lights, while the first relay is made with an additional make contact, which is included in the control circuit of the time delay unit, and its first make contact is connected between the buzzer and the ignition switch, control switch is connected between the first key, the second input of which is connected to the output of the second threshold block, and the vehicle body, and the winding of the second relay and connected in series interconnected make contact of the second relay and signal lamps connected in parallel are connected to the battery through the first make contact of the first relay, a passive transponder mounted on the vehicle, made on a piezocrystal with an aluminum thin-film converter deposited on its surface and a set of reflectors, while the converter is made in in the form of an interdigital structure, plays the role of a delay line on surface acoustic waves and contains two comb systems electrodes connected to each other by buses that are connected to a microstrip antenna, also made on the surface of a piezocrystal, differs from the closest analogue in that it is equipped with a second and third multipliers, first and second low-pass filters, first and second extreme regulators, the first and second adjustable delay units, range indicator, angle indicator, second and third frequency doublers, second and third frequency dividers into two, second and third narrow-band filters a phase meter, a receiving antenna, a third high-frequency amplifier, a third mixer, a third intermediate-frequency amplifier, and a second multiplier is connected in series to the output of the second intermediate-frequency amplifier, the second input of which is connected to the output of the phase manipulator through the first variable delay unit, the first low-pass filter and the first extreme controller, the output of which is connected to the second input of the first adjustable delay unit, to the second output of which a range indicator is connected, a second frequency doubler, a second frequency divider for two, a second narrow-band filter and a phase meter are connected in series to the output of the second intermediate frequency amplifier, a third high-frequency amplifier, a third mixer, the second input of which is connected to the output of the second local oscillator, and a third intermediate amplifier are connected in series to the output of the receiving antenna frequency, the third multiplier, the second input of which is connected through the second block of adjustable delay to the output of the second intermediate frequency amplifier, the second filter is the lower frequencies and the second extreme regulator, the output of which is connected to the second input of the second adjustable delay unit, the angle indicator is connected to the second output of the output, the third frequency doubler, the third frequency divider into two and the third narrow-band filter, the output of which is connected to the output of the third intermediate frequency amplifier connected to the second input of the phase meter, receiving antennas are spaced horizontally at a distance d, where d is the measuring base.

The structural diagram of the transmitter installed at the control post is presented in figure 1. The structural diagram of the receiver and the Executive unit mounted on the vehicle is presented in figure 2.

A diagram of a transponder mounted on a vehicle is shown in FIG. 3. Timing diagrams explaining the operation of the device shown in figure 4 and 5.

The transmitter 1 consists of a serially connected master oscillator 2, a phase manipulator 4, the second input of which is connected to the output of the modulating code generator 3, power amplifier 5, duplexer 46, the input-output of which is connected to the transceiver antenna 6, the second high-frequency amplifier 47, and the second mixer 61, the second input of which is connected to the output of the second local oscillator 60, the second intermediate-frequency amplifier 62, the multiplier 63, the second input of which is connected to the output of the master oscillator 2, band-pass filter 64, second phases the second detector 48, the second input of which is connected to the output of the local oscillator 60, and the computer 49, the second multiplier 66 is connected to the output of the second intermediate frequency amplifier 62, the second input of which is connected to the output of the phase manipulator 4 through the first block 69 of the adjustable delay, the first lower filter 67 frequency and the first extreme controller 68, the output of which is connected to the second input of the first block 69 adjustable delay, to the second output of which is connected a range indicator 70, to the output of the second amplifier 62 intermediate a second frequency doubler 71, a second frequency divider 72 into two, a second narrow-band filter 73, and a phase meter 74 are connected in series.

A third high-frequency amplifier 76, a third mixer 77, the second input of which is connected to the output of the second local oscillator 60, a third intermediate-frequency amplifier 78, and a third multiplier 80, the second input of which is connected to the output of the second through the second block 83 of adjustable delay, are connected in series to the output of the receiving antenna 75 an intermediate-frequency amplifier 62, a second low-pass filter 81 and a second extremal controller 82, the output of which is connected to the second input of the second adjustable delay unit 83, to whose second output I connect the angle indicator 84 is marked. To the output of the third intermediate frequency amplifier 78, a third frequency doubler 85, a third frequency divider 86 into two and a third narrow-band filter 87, the output of which is connected to the second input of the phasemeter 74, are connected in series.

The second multiplier 66, the first low-pass filter 67, the first extreme controller 68 and the first adjustable delay unit 69 form the first correlator 65.

A third multiplier 80, a second low-pass filter 81, a second extremal regulator 82, and a second adjustable delay unit 83 form a second correlator 79.

Receiving antennas 6 and 75 are spaced horizontally at a distance d, where d is the measuring base.

The receiver 7 contains a receiving antenna 8 connected in series, a first high-frequency amplifier 9, a first mixer 58, a second input of which is connected to the output of the first local oscillator 57, a first intermediate frequency amplifier 59, a frequency doubler 12, a second spectral width meter 13, a comparison unit 14, and a second the input of which, through the first spectral width meter 11, is connected to the output of the intermediate frequency amplifier 59, the first threshold block 15, the second key 16, the second input of which is connected to the output of the intermediate frequency amplifier 59, the first phase the second detector 19, the second input of which through a series-connected frequency divider 17 into two and a narrow-band filter 18 is connected to the output of the frequency doubler 12, the unipolar valve 20, the drive 21 and the second threshold block 22. The frequency doubler 12, meters 11 and 13 of the spectrum width, block 14 comparison, threshold blocks 15 and 22, key 16, phase detector 19, frequency divider 17 into two, narrow-band filter 18, unipolar valve 20 and drive 21 form a detector 10.

The Executive unit 27 consists of a series-connected to the positive bus of the battery 29 of the ignition switch 28, contact 25.1 and the first winding of the ignition coil 24. In parallel with the battery 29, the ignition switch 28, the relay coil 25, the first key 23, the second input of which is connected to the output of the second threshold unit 22, and the switch 26, the contacts 25.2, 30.1 and the signal lamps 31-34 connected in parallel in series, are connected in series, and winding 30 relay. To the positive bus of the battery 29, a terminal 25.2, an audible warning device 35 and a time delay unit 40 are connected in series. A transistor 41 shunted by thyristor 38 and a capacitor 39 are connected to the output of the audible alarm 35. A zener diode 44 is connected to the base circuit of the transistor 41. A resistor 42, a resistor 43, a terminal 25.3, and a capacitor 45 are connected in series to the audible alarm 35.

The transponder 50 is a piezocrystal 51 with an aluminum thin-film transducer deposited on its surface and a set of reflectors 56. Moreover, the transducer is made in the form of an interdigital structure, plays the role of a delay line on surface acoustic waves (SAW) and contains two comb systems of electrodes 53 connected to each other with another bus 54 and 55, which are connected to a microstrip antenna 52, also made on the surface of the piezocrystal 51.

The principle of remote search and detection in the general transport stream of a stolen vehicle is based on the use of a complex phase-shift (PSK) signal, which is emitted by the transmitter, received and selected by the receiver, detected, accumulated and used to turn on marker lamps, an audible warning device and turn off the engine. Moreover, the included lamps 31-34 and the audible warning device 35 are a sign of detection of a stolen vehicle, and the turned off engine provides a delay of the vehicle and the hijacker. In this case, the transmitter 1 is installed at the control posts or the traffic police cars, and the receiver 7 and the executive unit 27 - on vehicles.

The use of a complex QPSK signal allows the use of a new type of selection - structural selection, which provides higher noise immunity and reliability of the specified signal among other signals and interference operating in the same frequency band and at the same time intervals.

The principle of operation of the interdigital transducer is based on the fact that the electric fields in space and time created in a piezoelectric crystal by a system of electrodes cause elastic strains due to the piezoelectric effect, which propagate in the crystal as a surfactant.

The device operates as follows. After turning on the transmitter 1 high-frequency oscillation (figure 4, a)

U ₁ (t) = υ _c Cos (ω _c t + φ _c ), O≤t≤T _c ,

where υ _s , ω _s , φ _s , T _s - amplitude, carrier frequency, initial phase and duration of high-frequency oscillation

from the output of the master oscillator 2 is fed to the first input of the phase manipulator 4, the second input of which is supplied with a modulating code M ₁ (t) (Figs. 4, 6) from the output of the generator 3 of the modulating code. As a result of phase manipulation at the output of the phase manipulator 4, the PSK signal is generated (Fig. 4, c)

U ₂ (t) = υ _c · Cos [ω _c t + φ _к1 (t) + φ _c ], O≤t≤T _c ,

where φ _к1 (t) = {o, π} is the manipulated component of the phase that displays the law of phase manipulation in accordance with the modulating code M ₁ (t), and φ _к (t) = const for К · τ _u <t <(К +1) · τ _u and can change stepwise at t = K · τ _u , i.e. at the boundaries between elementary premises (K = 0, 1, 2, ..., N-1);

τ _u , N is the duration and number of chips that make up the signal of duration T _c (T _c = N · τ _u ).

This signal after amplification in the power amplifier 5 is radiated by the antenna 6 into the air. In this case, the transceiver antenna 6 can be directional, for example parabolic, which ensures irradiation of only the transport stream passing by the control point.

The PSK signal U ₂ (t) is captured by the receiving antenna 8 of the vehicle and through the high-frequency amplifier 9 is fed to the first input of the mixer 58, the second input of which supplies the voltage of the first local oscillator 57

U _g1 (t) = υ _g1 · Cos (ω _g t + φ _g ).

At the output of the mixer 58, voltages of combination frequencies are generated. The amplifier 59 is allocated the voltage of the intermediate (differential) frequency (figure 4, g)

U _pr1 (t) = υ _pr1 · Cos [ω _pr t + φ _к1 (t) + φ _pr1 ], O≤t≤T _c ,

where υ _pr1 = 1/2 K ₁ · ν _s · ν _g1 ;

ω _CR = ω _with -ω _g is the intermediate frequency;

ω _pr1 = φ _c -φ _g ,

which is fed to the input of the detector 10, consisting of measuring instruments 11 and 13 of the spectral width, frequency doubler 12, comparison block 14, threshold block 15, key 16, frequency divider 17, narrow-band filter 18, phase detector 19, unipolar valve 20, storage 21 and threshold block 22. At the output of the frequency doubler 12, a harmonic voltage is generated (Fig. 4, d)

U ₃ (t) = υ _pr1 · Cos [ω _pr t + 2φ _pr1 ], O≤t≤T _c .

Since 2φ _k (t) = {o, 2π}, phase manipulation is already absent in the indicated voltage.

The width of the spectrum Δf _{2 of the} second harmonic is determined by the duration T _{c of the} signal (Δf ₃ = 1 / T _s ), while the width of the spectrum Δf of _the QPSK signal is determined by the duration τ _{u of} its elementary premises (Δf _c = 1 / τ _u ), i.e. . the width of the spectrum Δf _{2 of the} second harmonic of the signal is N times smaller than the width of the spectrum Δf _{c of the} input signal (Δf _c / Δf ₂ = N).

Therefore, when the frequency of the QPSK signal is doubled, its spectrum collapses N times. This makes it possible to detect the QPSK signal among other signals, noise, and interference even when its power at the receiver input is less than the power of noise and interference.

The width of the spectrum Δf _{c of the} input QPSK signal is measured using meter 11, and the spectrum width Δf _{2 of the} second harmonic of the signal is measured using meter 13. Voltages υ ₁ and υ ₂ proportional to Δf _c and Δf _2, respectively, from the outputs of meters 11 and 13 of width spectrum are fed to two inputs of the comparison unit 14. Since υ ₁ >> υ ₂ , a positive voltage is generated at the output of the comparison unit 14, which exceeds the threshold level υ by _p1 in the threshold unit 15. The threshold level υ by _p1 is selected so that it is not exceeded by random noise. When exceeding the threshold level υ _pop1 in the threshold block 15, a constant voltage is generated, which is supplied to the control input of the key 16, opening it. Keys 16 and 23 in the initial state are always closed. In this case, the PSK signal U ₂ (t) (Fig. 4, c) from the output of the intermediate frequency amplifier 59 is supplied through the public key 16 to the information input of the phase detector 19. The harmonic voltage U ₃ (t) from the output of the frequency doubler 12 is simultaneously transmitted to the input of the frequency divider 17 into two, the output of which a voltage is generated (figure 4, e)

U ₄ (t) = υ _pr1 · Cos (ω _pr t + φ _pr1 ), O≤t≤T _c .

This voltage is allocated by a narrow-band filter 18 and is supplied to the reference input of the phase detector 19. At the output of the latter, a low-frequency voltage is generated (figure 4, g)

U _н1 (t) = υ _н1 · _{Cosφ к1} (t), O≤t≤T _c ,

where υ _н1 = 1 / 2К ₂ · υ _пр1 ² ;

K ₂ - the transfer coefficient of the phase detector,

corresponding in form to the modulating code M ₁ (t) (Fig. 4, c). The specified voltage is supplied to the input of a unipolar valve 20, the output of which only positive impulses are generated (Fig. 4, h). These pulses after accumulation in the drive 21 exceed the threshold level υ _pore2 in the threshold unit 22. When this level is exceeded, a constant voltage is generated in the threshold unit 22, which is supplied to the control input of the key 23, opening it. In this case, the constant voltage of the battery 29 through the closed ignition switch 28, the open key 23 and the closed device switch 26 is supplied to the relay coil 25. The device switch 26 is installed on the vehicle in a place known only to the owner. When the relay 25 is activated, contact 25.1 opens and contacts 25.2 and 25.3 close. Open contact 25.1 turns off the engine, causing the vehicle to stop.

The constant voltage of the battery 29 through a closed contact 25.2 is fed to the coil of the relay 30, which is activated and closes the contact 30.1. In this case, the signal lamps 31-34 are installed, mounted on the front and rear panels of the vehicle body. At the same time, the voltage of the battery 29 through a closed contact 25.2 is supplied to the audible warning device 35. The operation of the warning lamps 31-34 and the audible warning device 35 is a sign of detection of a stolen vehicle. The anti-theft device circuit uses the sound alarm and parking lamps already on the vehicle.

When the contacts 25.2 and 25.3 are closed, the supply voltage is also supplied to the time delay unit 40, consisting of a transistor 41, resistors 42 and 43, a zener diode 44, and a capacitor 45. The capacitor 45 starts to charge after a certain time interval (5-7 s), which is regulated by a variable resistor 43, the voltage across the capacitor 45 reaches the opening voltage of the zener diode 44, the thyristor 38 is unlocked and the buzzer 35 is activated. To maintain the thyristor 38 in the open state, the charge of the capacitor 37 is used. The buzzer p 35 and marker lamps 31-34 are still working to the detention of the vehicle and the car thief. If the audible alarm 35 is activated, it cannot be turned off only by turning off the ignition switch 28. To turn off the audible alarm 35, it is necessary to turn off the ignition and briefly press the switch 36. This ensures that the thyristor 38 is locked and its re-opening is prevented.

At the same time, the probing QPSK signal U ₂ (t) (Fig. 4 c) irradiates a passive transponder 50, which can be mounted in one or more elements of the vehicle, camouflaged for a specific object, or can be made in the form of a separate miniature device that fits in a secret place of the vehicle.

The principle of operation of the passive transponder 50 is based on the acoustic processing of the received FMN radio pulse using a delay line on surface acoustic waves (SAWs).

The basis of the operation of devices on surfactants are three physical processes:

- conversion of the input electrical signal into an acoustic wave;

- the propagation of an acoustic wave over the surface of a sound duct and its reflection;

- the inverse transformation of the surfactant into an electrical signal with parameters determined by the internal structure of the interdigital transducer.

For forward and reverse conversion, an interdigital converter is used, the passband of which is much larger than the spectrum width Δf _{c of the} received signal.

An acoustic wave obtained in the transducer propagates along the surface of the piezocrystal 51 and after a while reaches the reflecting plates 56, which reflect the acoustic wave back with a phase determined by the position of the reflecting plates 56 and an amplitude proportional to the reflection coefficient. The surfactant converter converts the reflected acoustic wave back into a radio pulse with phase shift keying (figure 5, b)

U ₅ (t) = υ ₅ · Cos [ω _c t + φ _к2 (t) + φ ₂ ], O≤t≤T _c ,

where φ _к2 (t) = {o, π} - is determined by the internal structure of the interdigital transducer (modulating code M ₂ (t) (Fig. 5, a)).

As an example, figure 3 and figure 5, and shows the interdigital structure for the code 10100101.

The generated radio pulse U ₅ (t) (Fig. 5, b) is radiated by the microstrip antenna 52 and received by antennas 6 and 75:

U ₆ (t) = υ ₆ · Cos [ω _c (t-τ _z1 ) + φ _k2 (t-τ _z1 ) + φ ₆ ],

U ₇ (t) = υ ₇ · Cos [ω _c (t-τ _З2 ) + φ _к2 (t-τ _З2 ) + φ ₇ ], O≤t≤T _c ,

where τ _s1 = 2R / C is the delay time of the relay signal relative to the probing;

R is the distance from the control post to the stolen vehicle;

C is the propagation velocity of radio waves,

and through the duplexer 46, the amplifiers 47 and 76 go to the first inputs of the mixers 61 and 77, respectively, to the second inputs of which the voltage of the local oscillator 60 is supplied (Fig. 5, d)

U _g2 (t) = υ _g2 · Cos (ω _g t + φ _g ).

At the outputs of the mixers 61 and 77, voltages of combination frequencies are generated. Amplifiers 62 and 78 are allocated voltage intermediate (differential) frequency:

U _pr2 (t) = υ _pr2 · Cos [ω _pr (t-τ _z1 ) + φ _k2 (t-τ _z1 ) + φ _pr2 ],

U _pr3 (t) = υ _pr3 · Cos [ω _pr (t-τ _z2 ) + φ _k2 (t-τ _z2 ) + φ _pr3 ], O≤t≤T _c ,

_np2 where υ = 1 / 2υ ₆ · υ _r2;

_PR3 υ = 1 / 2υ ₇ · υ _r2;

ω _CR = ω _with -ω _g is the intermediate frequency;

υ _pr2 = φ ₆ -φ _g2 ;

υ _pr3 = φ ₇ -φ _g2 ;

The voltage U _pr2 (t) from the output of the intermediate frequency amplifier 62 is supplied to the first input of the multiplier 63, the second input of which is supplied with a high-frequency oscillation U ₁ (t) (Fig. 4, a) from the output of the master oscillator 2. A voltage is generated at the output of the multiplier 63

U ₈ (t) = υ ₈ · Cos [ω _g (t-τ _z1 ) + φ _k (t-τ _z1 ) + φ _g ], O≤t≤T _c ,

where υ ₈ = 1 / 2υ _c · υ _pr2 .

which is a PSK signal at a frequency ω _{g of the} local oscillator 60, is allocated by a band-pass filter 64 and fed to the first (information) input of the phase detector 48. The voltage U _g2 (t) is applied to the second (reference) input of the phase detector 48 5, d) a local oscillator 60. As a result of synchronous detection at the output of the phase detector 48, a low-frequency voltage is generated (Fig. 5, e)

U _n2 (t) = υ _n2 · _{Cosφ k2} (t-τ _z1 ), O≤t≤T _c ,

_2n where υ = 1 / 2υ ₈ · υ _r2

proportional to the modulating code M ₂ (t) (Fig. 5, a). This voltage from the output of the phase detector 48 is sent to the database of the computer 49 for identification. It is an individual marking of the inspected vehicle, for example, its identification number. Previously, individual numbers of stolen vehicles are registered by entering them into the computer database 49. Based on the identification results, a decision is made and the characteristics of the stolen vehicle are determined.

At the same time, the voltage U _pr2 (t) from the output of the intermediate frequency amplifier 62 is supplied to the first input of the multiplier 66, to the second input of which the PSK signal U ₂ (t) is supplied from the output of the phase manipulator 4 through the adjustable delay unit 69. The voltage obtained at the output of multiplier 66 is passed through a low-pass filter 67, at the output of which a first correlation function R ₁ (τ) is formed. The extreme controller 68, designed to maintain the maximum value of the correlation function R ₁ (τ) and connected to the output of the low-pass filter 67, acts on the control input of the adjustable delay unit 69 and maintains the delay τ introduced by it equal to τ _s1 (τ = τ _s1 ), which corresponds to the maximum value of the correlation function R ₁ (T). The range indicator 70 associated with the scale of the adjustable delay unit 69 is graded directly in the range values

R = C · τ _s1 / 2.

Therefore, the task of measuring the distance (distance) R from the control post to the stolen vehicle is reduced to measuring the time delay τ _{s1 of the} relay signal relative to the request signal.

The voltage U _pr3 (t) from the output of the amplifier 78 is supplied to the first input of the multiplier 80, the second input of which is supplied with the voltage U _p2 (t) from the output of the intermediate frequency amplifier 62 through the adjustable delay unit 83. The voltage obtained at the output of the multiplier 80 is passed through a low-pass filter 81, at the output of which a second correlation function R ₂ (τ) is formed. The extreme controller 82, designed to maintain the maximum value of the correlation function R ₂ (τ) and connected to the output of the low-pass filter 81, acts on the control input of the adjustable delay unit 83 and maintains the delay τ introduced by it equal to τ _z2 (τ = τ _z2 ), which corresponds to the maximum value of the correlation function R ₂ (τ). The angle indicator 84 associated with the scale of the adjustable delay unit 83 is graded directly in the values of the angular coordinate

α = arcCosС · τ _z2 / d,

where τ _s2 = t ₁ -t ₂ ;

t ₁ ; t ₂ - the time the signal travels from the stolen vehicle to the first 6 and second 75 antennas;

d is the distance between antennas 6 and 75 (measuring base);

α is the azimuth to the stolen vehicle.

Therefore, the task of measuring the angular coordinate (azimuth) is reduced to measuring the relative time delay τ _s2 between the relayed signals received by antennas 6 and 75.

This forms the time scale for reading the angular coordinate: rough, but unequivocal.

Voltages U _CR2 (t) and U _CR3 (t) from the outputs of the amplifiers 62 and 78 of the intermediate frequency simultaneously arrive at the inputs of the frequency doublers 71 and 85, respectively, at the outputs of which harmonic voltages are generated

U ₉ (t) = υ ₉ · Cos [2ω _pr (t-τ _z1 ) + 2φ _pr2 ],

U ₁₀ (t) = υ ₁₀ · Cos [2ω _pr (t-τ _s2 ) + 2φ _pr3 ], O≤t≤T _c ,

where υ ₉ = 1 / 2υ _pr2 ² ;

υ ₁₀ = 1 / 2υ _pr3 ² .

These voltages are fed to the inputs of the frequency dividers 72 and 86 into two, at the output of which the following voltages are formed

U ₁₁ (t) = υ ₁₁ · Cos [ω _pr (t-τ _z1 ) + 2φ _pr2 ],

U ₁₂ (t) = υ ₁₂ · Cos [ω _pr (t-τ _z2 ) + φ _pr3 ], O≤t≤T _c ,

which are allocated by narrow-band filters 73, 87 and are fed to two inputs of the phasemeter 74.

Phasometer 74 measures the phase difference

Δφ = φ ₆ -φ ₇ = 2πd / λ Cosα,

where d is the measuring base (distance between antennas 6 and 75);

λ is the wavelength.

This forms the phase scale for reading the angular coordinate: accurate, but ambiguous, which provides a measure of the relative time delay between the relayed signals received by antennas 6 and 75.

Therefore, the specified device provides not only remote search and detection of a stolen vehicle located in the common traffic stream, and its delay, but also transmission to the control point of alarm information containing information about the stolen vehicle.

In addition, alarm information is transmitted to the control point via radio channel when the stolen vehicle is in a static de-energized state in the parking lot, in the garage or simply on the street with its corresponding exposure to the scanning device.

The main advantage of the automatic teleindication system of a stolen vehicle located in dynamics or statics is the ability to use passive, i.e. small-sized transponder that does not require power sources.

Another advantage is the possibility of combining the functions of re-emission of energy, coding of individual information about a stolen vehicle and the functions of a sensor of any physical quantity in one device with a simple design.

In some cases, the positive property of a passive surfactant transponder for surfactants can be considered low costs for long-term operation (lack of battery and long MTBF).

In special cases, the reading of individual markings from stolen vehicles can be done covertly, without visible signs of their exposure.

Thus, the proposed device in comparison with the prototype provides not only the search and detection of a stolen vehicle, but also the measurement of azimuth and distance to the stolen vehicle, i.e. allows you to determine the location of a stolen vehicle. Thus, the functionality is expanded.

Claims (1)

An anti-theft device for a vehicle, containing a transmitter installed at the control station and consisting of a serially connected master oscillator, a phase manipulator, the second input of which is connected to the output of the modulating code generator, power amplifier, duplexer, the input-output of which is connected to the transceiver antenna, and the second amplifier high frequency, a second mixer, the second input of which is connected to the output of the second local oscillator, the second intermediate frequency amplifier, the first multiplier, WTO a swarm input of which is connected to the output of a master oscillator, a bandpass filter, a second phase detector, a second input of which is connected to the output of the second local oscillator, and a computer, a receiver mounted on a vehicle and consisting of a first receiving antenna, a first high-frequency amplifier, and a first mixer , the second input of which is connected to the output of the first local oscillator, the first intermediate frequency amplifier, the first frequency doubler, the second spectral width meter, the comparison unit, the second whose path through the first spectral width meter is connected to the output of the first intermediate frequency amplifier, the first threshold block, the second key, the second input of which is connected to the output of the first intermediate frequency amplifier, the first phase detector, the second input of which through the first and second divider a narrow-band filter is connected to the output of the first frequency doubler, a unipolar valve, a drive and a second threshold block mounted on the vehicle, the first and second e relays, the first with the closing and opening contacts, and the second with the closing contacts, the winding of the first of which is connected to the vehicle battery through the ignition switch, and the opening contact is included in the ignition coil circuit, time delay unit, thyristor included in the sound supply circuit signaling device parallel to the switch of the audio signaling device and connected by a control electrode to the output of the time delay unit, the first key connected in series with the winding of the first relay and the first relay is made with an additional make contact, which is included in the control circuit of the time delay unit, and its first make contact is connected between the buzzer and the ignition switch, the control switch is connected between the first key, the second input of which is connected to the output of the second threshold block, and the vehicle body, and the winding of the second relay and the closing contact of the second relay connected in series and connected in parallel signal lamps are connected to the battery through the first make contact of the first relay, a passive transponder mounted on the vehicle, made on a piezocrystal with an aluminum thin-film converter deposited on its surface and a set of reflectors, while the converter is made in the form of an interdigital structure, plays the role of a delay line on surface acoustic waves and contains two comb systems of electrodes connected to each other by buses that are connected to microfields Oskennoy antenna, also made on the surface of the piezocrystal, characterized in that it is equipped with a second and third multipliers, first and second low-pass filters, first and second extreme regulators, first and second adjustable delay units, range indicator, angle indicator, second and third frequency doublers, second and third frequency dividers into two, second and third narrow-band filters, phase meter, second receiving antenna, third high-frequency amplifier, third mixture a third intermediate-frequency amplifier, and a second multiplier is connected in series to the output of the second intermediate-frequency amplifier, the second input of which is connected to the output of the phase manipulator through the first adjustable delay unit, the first low-pass filter and the first extreme controller, the output of which is connected to the second input of the first block adjustable delay, to the second output of which a range indicator is connected, to the output of the second intermediate-frequency amplifier, the second a frequency doubler, a second frequency divider into two, a second narrow-band filter and a phase meter, a third high-frequency amplifier, a third mixer, the second input of which is connected to the output of the second local oscillator, a third intermediate frequency amplifier, and a third multiplier, the second input of which is connected to the output of the receiving antenna the second adjustable delay unit is connected to the output of the second intermediate-frequency amplifier, the second low-pass filter and the second extreme regulator, the output of which is connected to the second input m of the second adjustable delay unit, whose angle indicator is connected to the second output, the third frequency doubler, the third frequency divider into two and the third narrow-band filter, the output of which is connected to the second input of the phase meter, are connected to the output of the third intermediate frequency amplifier, the receiving antennas are spaced in the horizontal plane at a distance d, where d is the measuring base.

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