RU2168768C1 - System for identifying motor vehicles - Google Patents

Abstract

FIELD: traffic control systems, possibly motor vehicle identification. SUBSTANCE: system includes demander placed in monitoring station and answer receiver placed in motor vehicle, both sending radiomessages one to another and receiving them respectively. Demander includes transmitter, isolating unit, antenna, control board, computer, videocamera, display, receiver. Answer receiver includes second antenna, second isolating unit, second transmitter, decoder, two ROMs, address counter, comparator, inverter, key and clock pulse generator. EFFECT: enhanced reliability of motor vehicle identification due to code separation of identified objects. 2 dwg

Description

 The proposed device relates to the field of traffic regulation and can be used to identify vehicles.

 Known "Device for detecting vehicles near bus stops" according to US patent N 5382953 dated 04/14/94 (published in the journal "Inventions of the World", 1996, N 3, p. 19), in which, using a sensor, a sign detection device and control means a vehicle is detected. However, this device has low adaptability.

 Also known is a "Device for identifying cars at monitoring stations" according to patent WO N 9613023 from 10.20.95, published in the journal "Inventions of the World" for 1997, N 3, p. 28. The specified device contains a video camera at the monitoring station and a lighting device forming an optical image on the surface of passing cars. The resulting image after processing is used to determine the height of the cars.

 The disadvantage of this device is a narrow range of recognizable vehicle parameters.

 Closest to the technical nature of the proposed device is the "Identification System" on the application of the UK N 2179525 from 03/04/87, bull. N 9, adopted as a prototype.

Functional diagram of the prototype is shown in FIG. 1, where the following notation is accepted:
1 - interrogator;
2 - transponder;
3, 10 - transmitters;
4, 9 - receivers;
5, 8 - decoupling elements,
6, 7 - antennas,
11 - sensor.

 The prototype device comprises an interrogator 1 installed at a control point, and a transponder 2 located at the facility, exchanging information with each other via a radio channel, while in part of the interrogator 1, a transmitter 3, an isolation element 5 and an antenna 6, and a receiver 4 are connected in series the input of which is connected to the second output of the isolation element 5, in part of the transponder 2, the antenna 7 is connected in series, the isolation element 8, the receiver 9 and the transmitter 10, the output of which is connected to the second input of the isolation element 8, as well as tchik 11, whose output is connected to the second input 10 of the transmitter.

 The prototype device operates as follows. The transmitter 3 of the interrogator 1 generates a request signal, which is transmitted through the junction element 5 to the antenna 6 and then transmitted to the radio communication channel. From the radio channel, this signal is received by the antenna 7 of the transponder 2 and enters through the decoupling element 8 to the receiver 9. Based on the received request signal, the receiver 9 generates a control signal, which is fed to the transmitter 10 and turns it on in the transmission mode. Information from the sensor 11 is fed to the second input of the transmitter 10 and transmitted through the isolation element 8 to the antenna 7, emitting a signal into the radio communication channel.

 From the radio channel, the response signal from the transponder 2 is received using the antenna 6 of the interrogator 1 and arrives through the junction element 5 to the receiver 4 to the user.

 The object to be identified may be a processing tool, such as a cutting tool of a machine tool. In this case, the transponder 2 is placed in the groove of the instrument. As the sensor 11, the transponder may contain tuned circuits that generate information about the wear or condition of the tool, i.e. various telemetric information.

 However, the prototype device has the disadvantage of low reliability of recognition (identification) of objects.

 In order to eliminate this drawback, a prototype device containing an interrogator installed at a control point and a transponder located on a motor vehicle exchanging information with each other via a radio channel, while in the interrogator part, a transmitter, an isolation element, and an antenna, as well as a receiver, are connected in series the input of which is connected to the second output of the isolation element, in the transponder part, the second antenna, the second isolation element and the second receiver, and the second ne the transmitter, the output of which is connected to the second input of the second isolation element, is additionally introduced into the interrogator part in series-connected control panel and a computer, the output of which is connected to the transmitter input, a video camera and a display, while the video camera output is connected to the second input of the computer, the second output of which is connected to the input of the display, and the output of the receiver is connected to the third input of the computer, in part of the transponder, a clock pulse generator, a key, an address counter and an inverter for which is connected to the second input of the second receiver, a decoder, a comparison element and two read-only memory devices, while the output of the second receiver is connected to the input of the decoder, a group of n outputs of which is connected to the first group of n inputs of the comparison element, a group of n outputs of the first constant memory device is connected to the second group of n inputs of the comparison element, the output of which is connected to the second input of the address counter, a group of m outputs of the address counter is connected to a group of m inputs of the second toyannogo memory whose output is connected to the input of a second transmitter, the second transmitter a second input connected to the output of the address counter and the second input key.

A functional diagram of the proposed device is shown in FIG. 2, where the following notation is accepted:
1 - interrogator;
2 - transponder;
3 - computer;
4 - display;
5 - control panel;
6 - video camera;
7, 16 - transmitters;
8, 12 - decoupling elements;
9, 13 - receivers;
10, 11 - antennas;
14 - ivertor;
15 - decoder;
17 - element of comparison;
18 - address counter;
19, 20 - read-only memory (ROM);
21 - key;
22 - clock generator (GTI).

 The proposed device comprises an interrogator 1 installed at a checkpoint and a transponder 2 located on a vehicle exchanging information with each other via a radio channel, while in the interrogator part 1, a control panel 5, a computer 3, a transmitter 7, an isolation element 8 and an antenna are connected in series 10, display 4, video camera 6 and receiver 9, while the output of video camera 6 is connected to the second input of computer 3, the second output of which is connected to the input of display 4, the second output of isolation element 8 is connected to the input the receiver 9, the output of which is connected to the third input of the computer 3, in the transponder part 2, the antenna 11 is connected in series, the decoupling element 12, the receiver 13 and the decoder 15 are connected in series by the GTI 22, key 21, address counter 18 and inverter 14, the output of which is connected to the second input of the receiver 13, serially connected ROM 19 and the transmitter 16, the output of which is connected to the second input of the isolation element 12, the comparison element 17 and the ROM 20, while a group of n outputs of the decoder 15 is connected to the first group of n inputs of the comparison element 17, g a group of n outputs of ROM 20 is connected to the second group of n inputs of the comparison element 17, the output of which is connected to the second input of the address counter 18, a group of m outputs of the address counter 18 is connected to a group of m inputs of the ROM 19, the second input of the transmitter 16 is connected to the output address counter 18 and the second input of the key 21.

 The proposed device operates as follows. The operator of the control point, on which the interrogator 1 is installed, monitors the flow of vehicles with the help of a video camera 6. To control the vehicle, he dials on the control panel 5 his license plate. The signal from the control panel 5 enters the computer 3, where in its memory a call code is searched for, corresponding to the license plate of the vehicle. Then, the found call code is transmitted using the transmitter 7 through the junction element 8 to the antenna 10 and then to the radio channel. From the radio channel, this signal is received by the antenna 11 of the transponder 2, placed on the car, and is fed through the decoupling element 12 to the receiver 13. From the output of the receiver 13, the detected signal is transmitted to the decoding device 15, where errors resulting from interference in the communication channel are detected and corrected . On the comparison element 17, the output code of the decoder 15 is compared with the call code stored in the ROM 20. When the codes match, the comparison element 17 generates a pulse that sets the address counter 18 to its initial state. At the transfer output of the address counter 18, a high level potential appears (log. "1"), which turns on the transmitter 16 and turns off the receiver 13 through the inverter 14. The same signal on the address counter 18 opens the key 21 and allows the passage of pulses from the GTI 22 to its clock input . In ROM 19, an identification code is stored that contains all the data about the vehicle and has an unambiguous correspondence with the number of the engine, body, chassis, state license plate (issued when registering the vehicle), make, color, year of manufacture and owner of the car. Redundancy elements are also included in this code, which make it possible to recognize and eliminate errors that occur in the communication channel as a result of interference. Upon receipt of pulses from the GTI 22 through the key to the clock input of the address counter 18, the code of the address counter 18 will change. From the output of the ROM 19 to the input of the transmitter 16 will be read the pulse sequence that defines the identification code of the vehicle. The output signal of the transmitter 16, modulated by this code sequence, through the isolation element 12 is fed to the antenna 11 and then to the radio channel. The code of the address counter 18 will change until a transfer signal appears on its output (low level potential, log. "0"). The transfer signal indicates that the identification code is completely read from the ROM 19. This signal will prohibit the passage of pulses through the key 21 to the clock input of the address counter 18, and also turn off the transmitter 16 and turn on the receiver 13. In the absence of clock pulses, the code of the address counter 18 will not change and the transponder 2 will be in reception mode until a new call signal arrives.

From the radio channel, the response signal from the transponder 2 is received using the antenna 10 of the interrogator 1 and fed through the decoupling element 8 to the receiver 9 and then to the computer 3. Computer 3 compares the identification code received from the transponder 2 with the data stored in its memory and displays display 4 information about the tested car. In this case, a signal about the detention of the car is issued in the following cases:
- the car does not respond to the request signal transmitted from the control point;
- the identification code received from the car coincides with the code entered in the "black list" (for example, the car was stolen);
- the received data on the identification code does not correspond to the actually observed.

 The proposed device is implemented physically based on elements and blocks, widely known from the technical literature.

 The technical efficiency of the proposed device in comparison with the prototype is a higher reliability of recognition (identification) of the object. This is explained by the following. In the prototype device, recognition is performed by a request signal received at a certain carrier frequency, i.e. according to the principle of frequency separation of objects.

In the proposed device, recognition is based on code separation of objects, while the recognition process itself is divided into two stages:
1) preliminary (on a code call sending n bits);
2) final (according to the identification code N = 2 ^m bits).

 Given a larger identification code length N >> n (a large number of object recognition parameters), a higher degree of identification can be obtained.

Claims (1)

 A vehicle recognition system containing a requestor installed at a checkpoint and a transponder placed on a vehicle exchanging information with each other via a radio channel, while the requestor contains a serially connected transmitter, an isolation element and an antenna, as well as a receiver whose input is connected to the second output decoupling element, the transponder contains a second antenna connected in series, a second decoupling element and a second receiver, as well as a second transmitter, the output of which connected to the second input of the second isolation element, characterized in that the interrogator further includes a series-connected control panel and a computer, the output of which is connected to the input of the transmitter, a video camera and a display, while the output of the video camera is connected to the second input of the computer, the second output of which is connected to the input of the display, and the output of the receiver is connected to the third input of the computer, a series-connected clock generator, key, address counter and invert are additionally introduced into the transponder OR, the output of which is connected to the second input of the second receiver, a decoder, a comparison element and two read-only memory devices, while the output of the second receiver is connected to the input of the decoder, a group of n outputs of which is connected to the first group of n inputs of the comparison element, a group of n outputs the first read-only memory is connected to the second group of n inputs of the comparison element, the output of which is connected to the second input of the address counter, the group of m outputs of the address counter is connected to the group of m inputs of the second second read only memory whose output is connected to the input of a second transmitter, the second transmitter a second input connected to the output of the address counter and the second input key.

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