RU2254596C2 - System of identification of mobile objects - Google Patents

Abstract

FIELD: the proposed invention refers to radio technique and may be used at designing systems, identification of mobile objects for which demands about increased stability of imitation are made.

SUBSTANCE: the essence of the proposed invention is that for ensuring of high stability of imitation a random synchronous coding of request and response signals is made with using of the information about time and coordinates received with the help of receiver-indicators of a satellite radio navigational system, introduced in the composition of a requester and a transponder.

EFFECT: increases efficiency of the system of identification at the expense of excluding of a wire channel necessary in the prototype for initial synchronization of oscillator impulses of a requester and a transponder and ensuring of a lasting stable imitation request and transmission in a response signal by the object the information about its coordinates.

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Description

The present invention relates to radio engineering and can be used in identification systems for moving objects, which are required for high imitation resistance.

Known [1] is a secondary radar system for identifying moving objects and consisting of a radar station, an interrogator including an encoder, transmitter, circulator, transceiver antenna, receiver, decoder, memory unit and information display unit, and a transponder containing transceiver antenna, circulator , receiver, decoder, memory unit, encoder and transmitter.

In this system, the interrogator transmitter generates encrypted encoded signals that are emitted by the interrogator antenna, received by the transponder antenna, amplified by the receiver, decrypted and transferred to the memory unit, where they are compared with the code assigned to the object on which the transponder is installed, and if they coincide, the transponder encoder modulates the transmitter generating a coded signal that is emitted by the transponder’s transceiver antenna, received by the interrogator’s transceiver antenna, amplified by the receiver, decoded the decoder and enters the memory unit and the information display unit, which displays the code assigned to the installation object of the responder.

The disadvantage of this system is the low imitability, since the codes of interrogation and response pulses do not change and can be determined and used for misinformation.

Therefore, interrogators use signals whose codes synchronously change with the codes of the responder, which increases the imitability of the recognition system.

The closest analogue (prototype) in terms of features is a friend-or-foe recognition system [2], including (Fig. 1) an interrogator 41, which includes a pulse generator (GI) 1, a digital counter (DS) 2, and a code computational device (HLC) 3, a subtractor (WU) 4, the second input of which is connected to the output of the response signal decoder 5 (DOS) connected to the output of the response signal receiver (SOS) 6, phase synchronizer 7, digital code synchronizer 8, second line delays 16, first delay line 17, request register numbers 19, the first electronic key (EC) 20, the second electronic key 21, the fourth delay line 23, the request number encoder (KCH) 25, the transmitter (Rx) 26, the antenna switch (AK) 27, the clock counter (STI) 28, a clock pulse generator (GTI) 29, a matching circuit (SS) 42, an encryption block (ШК) 44, and a transponder 40, including a pulse generator (ГИ) 9, a digital counter (ЦС) 10, a code computing device (HLC) 11, an adder codes 12, an encoding device (CS) 13, a response signal transmitter 14, a fourth delay line 18, a fourth electronic key 22, third electronic key 24, a clock generator (GTI) 30, a clock counter (STI) 31, a buffer register (BR) 32, an antenna switch (AK) 33, a request signal receiver (PRS) 34, a request number decoder (DZCH) 35 , the request number register (RPC) 36, the adder modulo two 37, the password register (RP) 38, the hit counter (CC) 39, the fifth delay line (LZ) 43, the encryption block (CC) 45.

The relationship between these blocks correspond to those shown in figure 1.

The principle of the system is that before using the object, for example, an airplane on which the transponder 40 is installed, the interrogator blocks 7 and 8 use the wire channel to synchronize the transponder's SI 9 and DS 10 with signals taken from the outputs of the GUI 1 and DS 2 of the interrogator 41. As shown in [2], if the relative stability of the frequencies generated by ГИ 1 and ГИ 9 is ensured, of the order of 10 ^-7 , then during 28 hours of continuous operation after synchronization, the ЦС 2 and ЦС 10 will show the same numbers that arrive respectively at the HLC 3 and HLC 11, designed to lnyat sequence of mathematical and logical operations, providing synchronous change output codes HLC HLC 3 and 11 at random. This code is fed through the CC 44 to the input of the RZCh 19.

In the request mode, carried out by the operator or automatically, the code recorded in the RZCh 19, through the EC 20 and the KChCH 25 modulates the transmitter 26, the oscillations of which through AK 27 are fed to the interrogator antenna, emitted, received by the responder antenna, through the AK 33 are fed to the receiver 34, amplified by it, decoded by the ДЗЧ 35 and fed through the РЗЧ 36 to the adder modulo two 37, the second inputs of which are supplied with a code from the output of the password register 38. When these codes coincide, the SS 39 generates a signal received at the second input of the response signal transmitter 14, transmitting the code from the output of the adder 12, which is the sum of the codes from the output of the HLC 11 and the password code. Therefore, the transmitter 14 is launched only if the codes recorded in the HLC 3 and HLC 11 match. The microwave oscillations of the transmitter 14 are supplied to the AK 33, emitted by the transceiver antenna of the responder 40, received by the interrogator antenna 41, fed to the receiver 6 through AK 27, amplified by it, DOS 5 are decoded and fed to the second inputs of the VU 4, the first input of which receives the code from the output of the HLC 3. Thus, a password code is generated at the output of the HL 4.

Synchronous change in the random code number (code) at the outputs of the HLV 3 and HLW 11 and additional encryption of the request code ШК 44 provide high imitability of this system. As shown in [2], p.10, the probability P of the correct answer in a single recognition attempt

where m is the number of characters of the code.

Therefore, choosing the number m, we can provide the required value of probability P.

The disadvantages of this system are the need for initial synchronization of pulse generators 1 and 9 and digital counters 2 and 10 of the interrogator and the transponder using a wired communication channel, which is not possible when installing the transponder on a number of moving objects (tanks, ships, etc.), and desynchronization pulse generators 1 and 9, which can occur, as already noted, after 28 hours of continuous operation even with high relative stability (10 ^-7 ) of the frequency of the pulse generators of the interrogator and responder.

The aim of the invention is to increase the efficiency of the object recognition system by eliminating the initial synchronization of the interrogator and the responder with a wired communication channel and providing an almost continuous synchronous operation mode of the interrogator and the responder.

This goal is achieved by the fact that in the well-known identification system, including the interrogator, which includes a code computing device, an encryption block, serially connected encoder of the request number, transmitter, antenna switch and antenna, serially connected receiver of the response signal, the input of which is connected to the second output antenna switch, a decoder of the response signal and a subtractor, and a transponder including a series-connected code computing device, the sum codes, encoder, transmitter, antenna switch and antenna, serially connected receiver of request signals, the input of which is connected to the second output of the antenna switch, decoder of request number, register of request number, adder modulo two and counter of coincidences, encryption block and buffer connected in series register, additionally entered: in the interrogator, a serial-connected receiver of a satellite radio navigation system and an information converter, connected in series The code setter of the object, the code adder, the second input of which is connected to the output of the code computing device, and the output to the input of the encryption block, the output of which is connected to the second input of the subtracting device and the third input of the encoder of the request number, the first output of the information converter is connected to the first input of the code the computing device and the first input of the code generator, the second output is to the second inputs of the code computing device and the code generator, the third input of the code adder and the first input of the encoder and the request number, the third output is to the third inputs of the code computing device and the code generator, the fourth output is to the fourth input of the code adder, the fifth output is to the second input of the request number encoder, the sixth output is to the fourth input of the request number encoder, and entered into the responder the serial-connected receiver-indicator of the satellite radio navigation system, the information converter and the object code sensor, the output of which is connected to the second input of the code adder, the input of the encryption block is connected to the second ode to the code adder, the first output of the information converter is connected to the first inputs of the code computing device and the object code sensor and the third input of the code adder, the second output to the second inputs of the code computing device, object code sensor, request number register and buffer register, and the fourth input of the code adder , the third output - to the third inputs of the code computing device and the object code sensor, the fourth output - to the fifth input of the code adder, the fifth output - to the third input of the buffer register tra, the sixth output is to the third input of the request number register, the seventh output is to the fourth inputs of the request number register and buffer register, the eighth output is to the sixth input of the code adder, and the ninth output is to the second input of the code device.

The output of the system is the output of the subtractor containing information about the object number and its coordinates.

The essence of the invention lies in the fact that to ensure high imitability, random synchronous coding of interrogation and response signals is carried out using information about the time and coordinates obtained using the receiver indicators of the satellite radio navigation system, introduced into the interrogator and the responder.

Comparison of the claimed system with the prototype shows the presence of newly introduced blocks: a receiver-indicator (PI) of a satellite radio navigation system (SRNS) and an information converter into an interrogator and a responder, a code generator and a code adder into an interrogator, an object code sensor in the responder.

The introduction of such blocks to increase imitability from public sources is unknown, which allows us to conclude that the proposed solution meets the criterion of "Novelty."

Newly introduced blocks are known and described in the literature:

- SRNS receiver indicators in [3], p.264-393;

- adders of codes in [4], p.331-334;

- code adjusters in [5], p. 174.

The information converter can be performed according to the scheme shown in figure 4, containing widely used matching device and controller, described, for example, in [6], p.128, 151.

However, their inclusion in accordance with the described relationships makes it possible to synchronously rebuild the codes of the emitted interrogation and response signals and thereby increase the system resilience without using a wired communication channel between the interrogator and the responder.

Such a solution does not explicitly follow from the prior art, which meets the criterion of "Inventive step".

The essence of the invention is illustrated by a further description and drawings, which show:

- figure 1 is a functional diagram of a prototype;

- figure 2 is a functional diagram of the proposed system;

- figure 3 is a possible functional diagram of the receiver-indicator of a satellite radio navigation system;

- figure 4 is a possible functional diagram of the information converter;

- figure 5 - algorithm of the interrogator;

- 6 - algorithm of the controller of the responder;

- Fig.7 is an algorithm for generating a request signal and its decoding;

- Fig. 8 - signals explaining the principle of the system.

The identification system is presented in figure 2, which indicates:

1 - interrogator;

2 - receiver-indicator of a satellite radio navigation system (PISRNS);

3 - information converter (PI);

4 - code computing device (HLC);

5 - adder codes (SC);

6 - code setter (ZK);

7 - cipher block (ШК);

8 - request number encoder (KCH);

9 - transmitter interrogator (PRDZ);

10 - antenna switch (AK);

11 - interrogator antenna (AZ);

12 - receiver response signal (ProS);

13 - decoder response signal (DOS);

14 - subtractive device (WU);

15 - the defendant;

16 - transponder antenna;

17 - antenna switch (AK);

18 - request signal receiver (PRZS);

19 - request number decoder (DZCH);

20 - the register of the request number (RZCh);

21 - adder modulo two (SMD);

22 - hit counter (SS);

23 - object code sensor (ATP);

24 - receiver-indicator of a satellite radio navigation system (PISRNS);

25 - information converter (PI);

26 - code computing device (HLC);

27 - adder codes (SC);

28 - encryption block (HQ);

29 - buffer register (BR);

30 - coding device (KU);

31 - transponder transmitter (PrdO).

Communication between the above blocks correspond to those shown in figure 2.

Receiver 2 (24) (figure 3) contains:

32 - antenna unit (AB);

33 - receiver (PFP);

34 - analog-to-digital Converter (ADC);

35 - correlator;

36 - interface unit (BI);

37 - signal processor (SP);

38 - navigation processor (NP);

39 - interface device (DUT).

The relationship between these blocks correspond to those shown in Fig.3.

The information Converter (PI) 3 (25) (figure 4) contains serially connected:

40 - matching device (SU);

41 - controller.

On Fig presents:

- a - time of reception of satellite information by the respondent;

- b - time of reception of satellite information by the interrogator;

- c - information transfer to PI 25;

- g - information transfer in PI 3;

- d - impulse installation in the initial state of the HLC 4, SC 5, ZK 6 and KChCh 8;

- e - the momentum of recording information in the KVU 4 and 3K 6;

- g - pulse recording information in SC 5;

- and - the momentum of recording information in the SCPC 8;

- to - pulses at the output of 6 PI 3;

- l - microwave pulses at the output of AZ 11;

- m - microwave pulses at the output of AO 16;

- n - pulses at the output of ProC 18;

- o - impulse and initial settings RZCh 20, SS 22, DKO 23, KVU 26, SK 27 and BR 29;

- p - the momentum of recording information in the KVU 26 and DKO 23;

- p is the momentum of recording information in SC 27;

- c - pulse recording information in the BR 29;

- t - pulse recording information in the RZCh 20;

- y - pulses of reading information from RZCh 20 and BP 29;

- f - pulses of information recording in SC 27;

- x - pulses of reading information from KU 30.

The system operates as follows. The signals emitted by one of the GLONASS or GPS type SRNS satellites are received (FIG. 8) “a” and “b” by the antenna units 32 (FIG. 3) PIRS 24 and PIRS 2, respectively, are amplified and converted into intermediate frequency signals, which are fed to the analog-to-digital converter 34, which generates digital codes of the sine and cosine components of the received signal, arriving at the correlator 35, pre-processing them, the results of which are transmitted through the interface unit 36 to the signal processor 37, which processes the digital signal la, which is supplied to the navigation processor 38, which determines the time and coordinates of the object. The output information of the NP 38 through the interface device 39 is supplied to the PI 23 and PI 3, forming a parallel time code and pulses "d", "e", "g", "and" and "k". PI 3 (25) (Fig. 4) contains a matching device 40, which provides the conversion of the output code of the EPRS into a code adopted to ensure the operation of the controller 41.

The algorithms of the controllers PI 3 and PI 25 are presented in figure 5 and 6, respectively.

The pulse "d", taken from the output 2 PI 3, blocks KVU 4, SK 5, ZK 6 and KChCH 8 are set to the initial state. The pulse "e" from the output of 3 PI 3 the time code from the output of 1 PI 3 is recorded in the SC 6 and KVU 4, performing, as in the prototype, a sequence of mathematical and logical operations that provide synchronous change of the output codes of the KVU 4 and KVU 26 randomly, equally changing law.

The output code of the HLC 4 is supplied to the inputs 2 of the SC 5, the first outputs of which from the output of the SC 6 are the codes of the requested object, which the operator selects or is set according to the program. To increase the imitability, the output codes of the SC 6 are changed by the input code signal of time from the output 1 of PI 3 upon receipt of the pulse "e".

The operation of summing codes in SK 5 is carried out by the pulse "g", taken from the output 4 of PI 3 and fed to the input 4 of SK 5.

The output code of SK 5 through ShK 7, which provides additional uncertainty in the formation of the request signal, is fed to input 3 of the short-circuit breaker 8 and is written to it by the pulse "and" from output 5 of PI 3 coming to input 2 of the short-circuit breaker 8. Thus, recorded in the short-circuit breaker 8 the code contains information on time t and the number of the requested object and the signal marker.

The pulses "k", taken from the output of 6 PI 3 and delayed by the time τ ₃ , necessary for receiving the information of the SRRNS 24 of the transponder and writing it to the BR 29, are fed to input 4 of the short-circuit frequency converter 8, the output signal of which carries out modulation of the SPS 9. microwave oscillations of the SPS 9 through AK 10 are fed to AZ 11, emitted, AO 16 of the responder 15 are received, through AK 17 they are fed to the input of the PRZS 18, amplified by it and decoded by the DZCh 19.

The SRNS satellite signals are received by PISRNS 24, which generates information about time t and the coordinates of the requested object, arriving at PI 25, which generates information in the form of a parallel code on the planned coordinates, time and pulses “o”, “p”, “p”, “ s "," t "," y "," f "and" x ". The algorithm of the controller 40 of the PI block 25 is shown in Fig.6. The pulse "o", taken from the output 2 PI 25 and supplied to the second inputs of the RZCh 20, DKO 25, SS 22, KVU 26, BR 29 and the fourth input of the SC 27, the above blocks are set to the initial state. By “p” pulse, the time code from output 3 of PI 25 is recorded in KVU 26 and DKO 23. By “p” pulse taken from output 4 of PI 25, codes from the outputs of KVU 26 and DKO 23 are recorded in SK 27. The total code from its output through ШК 28 arrives at input 1 of BR 29 and is recorded by a pulse "s" from output 5 of PI 25, which is input to input 3 of BR 29.

Thus, in the BR 29 recorded the time code and the code of the object, i.e. the same code as the code of the signal emitted by AZ 11.

The code signal of the interrogator 1 is received by the AO 16, through the AK 17 it is fed to the input of the PRZS 18, amplified by it, decoded by the remote control device 19 and, in the form of a parallel code, is fed to the input 1 of the RZCh 20 and written into it by the pulse "t" taken from the output of 6 PI 25.

The delay time t ₃ between the pulses "o" and "t" should be such that by the time the pulse "t" arrives, the request signals emitted by AZ 11 are received and decoded, and is defined as

t ₃ ≥t ₁ + t ₂ + t _pp + t _c ,

where t ₁ is the difference in the time of arrival of the satellite signals at the inputs of SRNRS 2 and 24;

t ₂ - signal propagation time between the interrogator and the responder;

t _pp is the delay time of the signal in the receiver 18 of the responder;

t _c is the duration of the interrogation signal.

Obviously the greatest value

where R is the distance between the interrogator and the respondent;

C is the speed of light.

Similar

but

where α is a coefficient depending on the type of receiver;

Δf is the receiver bandwidth.

If, for example, R = 300 km, α = 1.37, Δf = 5 MHz and t _c = 50 μs, then t ₃ ≥1 + 1 + 0.000262 + 0.05≈2.05 ms.

The “y” pulses, the number of which corresponds to the number of bits of the request code from the output 7 PI 25, are supplied to the fourth inputs of the RZCh 20 and BR 29, by reading the codes recorded in them, which are respectively supplied to the first and second inputs of the SMD 21, which generates pulses when the bits coincide codes entering its inputs.

The pulses removed from the output of the SMD 21 are fed to the input 1 of the SS 22, forming a logical 1 signal, which is fed to the input 2 of the PI 25, if the codes recorded in the BR 29 and the RZCh 20 match, i.e. if the code of the request number corresponds to the code of the object on which the responder is installed. In this case, the PI 25 at the output 8 generates a pulse "f", which is fed to the input 6 of the SC 27 and enters into it additional information about the planned coordinates of the object, fed to the input 3 of the SC 27. The pulses "x" generated at the output of 9 PI 25 come to the input 2 of KU 30, modulating PrdO 31, microwave, the oscillations of which through AK 17 are supplied to AO 16 and emitted. Thus, the signals emitted by the transponder antenna contain information about the code and coordinates of the object on which the transponder is mounted. These signals are received by AZ 11, amplified by OSR 12, decoded by OSB 13 and fed to input 1 of VU 14, at the output of which information is generated on the coordinates of the object on which the transponder is mounted.

The process of transferring, receiving, and comparing the received and stored in the slave information 14 is explained in Figure 7, from which it follows that the time code output from the N _in 1 PI 3 CVU modified 4 code N _'30 and supplied to the second input of the adder 5 codes for the first input of which is supplied code N _'30 representing a modified code requested object N _30. The total code N _Σ = N ' _at + N' ₃₀ enters the encryption block 7, which provides additional uncertainty and generates an output code (N ' _at + N' ₃₀ ) ', modulating the transmitter 9.

In the transponder, the received time code N _in from the output 1 of the PI 25 is fed to input 1 of the HLC 26, which generates the modified code N ' _in , and to the first input of the ATP 23, in which the code of object N _{30 is} recorded. Removable output DKO 23 modified code N _'30 and code N' _{in the} output from the CVU 26 receives the adder codes 27, the output of which forms the code (N _'30 + N' _a) which is modified SK 28 to the code (N _'in + N _'30)' and enters the BD 29. Thus, in RZCH 20 and BL 29 are recorded the same codes. Therefore, after comparing them in SMD 21, SS 22 gives a signal for transmitting information containing codes (N ' _about + N' ₃₀ ) 'codes of the planned coordinates of the object.

This information is transmitted by the transponder, received and processed by the interrogator, and fed to the first input of the VU 14, the second input of which receives the code from the output of the CC 7. Since the transponder transmits a total signal containing codes (N ' _to + N' ₃₀ ) 'and the coordinates of the object , and at the first input of VU 14 codes (N ' _to + N' ₃₀ ) 'are received, then at the output of VU 14 a code is generated containing information about the coordinates of the object, which is received at the requestor's output and compared with information about the coordinates of the object obtained using airborne radar installed constant in close proximity to the interrogator.

An object is considered identified if its coordinates obtained by the above methods coincide.

The application of the proposed technical solution in comparison with the prototype allows you to abandon the use of a wired channel for the initial synchronization of the pulse generators of the interrogator and the responder and provides an almost infinite time of synchronous change according to the random law of the codes of the interrogation and response signals, which ensures high imitability of the proposed system, especially in conditions of organized reconnaissance .

The system can be implemented.

As shown in [3], pp. 210-211, the first line of the frame of the navigation message transmitted by each navigation satellite of the GLONASS navigation system contains information about the start time of the frame within the current day (five high-order bits transmit the number of whole hours, six average bits - the number average minutes, low order - the number of thirty second intervals). To increase imitability, you can additionally use information about the x - component of the velocity vector (24 bits) and the x - th coordinate of the nth navigation satellite (27 bits).

Thus, using only the first line of the navigation message frame, it is possible to obtain variable information in the form of 63 bits, which can be used in the interrogator and responder and transmit it to the input of code computing devices instead of the information taken from the outputs of digital counters 2 and 10 in the prototype.

The proposed identification system can be used, for example, to identify vessels engaged in licensed fishing in the territorial waters of the Russian Federation (RF), on which transponders described above should be installed. The need for such identification is due to the fact that the annual losses of the Russian Federation due to illegal fishing exceed $ 700 million [7], pp. 6-10.

If the transponder is installed on ships of the navy, then a NAVIS SN 3102 type indicator can be used, which provides a time measurement with an error of not more than 0.1 μs [3], p.380-381.

In the interrogator, the LEADER receiver-indicator can be used, providing time measurement with an error of not more than 0.1 μs [3], pp. 389-390.

Using the information provided in the application materials, it is possible to develop and manufacture, using the domestic element base, identification systems for moving objects with high imitation resistance, which can be used in the national economy and military equipment.

Literature

1. Secondary radar system. USSR author's certificate (SU) 3 1309754 for the application for invention No. 39456 0 / 00-09 (22) of 08.22.85. Inventions of the countries of the world, No. 22, issue 85, MKI G 01 R, RS, 1992, p.23.

2. The recognition system "friend or foe" Patent of the Russian Federation No. 2191403 on the application 2001133283/09 from 12/12/2001, CL G 01 S 13/78, 13/74.

3. Global satellite radio navigation system GLONASS. 2nd edition, edited by V.N.Kharisov, A.I. Perov, V.A.Boldin. - M .: IPRZhR, 1999, p. 380-381, 389-390.

4. W. Titze, K. Schenk. Semiconductor circuitry. - M.: Mir, 1982, p.331-334.

5. Z. Sobotka, J. Star. Microprocessor systems. - M.: Energoizdat, 1981, p. 174.

6. Boborykin A.V. and other single-chip microcomputers. - M .: Mikap, 1994, p.128, 151.

7. Moses B.C. et al. Development of a radio-electronic system for monitoring fishing zones. // Electronic Instrument Making. Issue 3 (19), 2001, pp. 6-10.

Claims (1)

A system for identifying moving objects, including a requestor, which includes a code computing device, an encryption block, a serial number of a request number encoder, a transmitter, an antenna switch and an antenna, a series-connected response signal receiver, the input of which is connected to the second output of the antenna switch, and a response signal decoder and a subtracting device and a transponder including a series-connected code computing device, a code adder, an encoding device , a transmitter, an antenna switch and an antenna, a serially connected receiver of request signals, the input of which is connected to the second output of the antenna switch, a decoder of a request number, a register of a request number, an adder modulo two and a counter of coincidences, connected in series to an encryption block and a buffer register, characterized in what is additionally introduced into the interrogator series-connected receiver-indicator of the satellite radio navigation system and information converter, series-connected rear an object code sensor, a code adder, the second input of which is connected to the output of the code computing device, and the output is to the input of the encryption block, the output of which is connected to the second input of the subtracting device and the third input of the request number encoder, the first output of the information converter is connected to the first input of the code computing device and the first input of the code setter, the second output to the second inputs of the code computing device and code setter, the third input of the code adder and the first input of the encoder the third output to the third inputs of the code computing device and code generator, the fourth output to the fourth input of the code adder, the fifth output to the second input of the request number encoder, the sixth output to the fourth input of the request number encoder, and sequentially entered connected receiver indicator of the satellite radio navigation system, an information converter and an object code sensor, the output of which is connected to the second input of the code adder, the input of the encryption block is connected to the second output ora of codes, the first output of the information converter is connected to the first inputs of the code computing device and the object code sensor and the third input of the code adder, the second output to the second inputs of the code computing device, object code sensor, request number register, match counter and buffer register and the fourth input codes adder, third output to the third inputs of the code computing device and object code sensor, fourth output to the fifth input of the code adder, fifth output to the third input of the buffer register, the sixth output - to the third input of the request number register, the seventh output - to the fourth inputs of the request number register and buffer register, the eighth output - to the sixth input of the code adder, and the ninth output - to the second input of the code device, while the coincidence counter generates the signal supplied to the second input of the information converter, the buffer register code is supplied to the second input of the adder modulo two.

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