KR970005597B1 - An apparatus for recognizing identification and its method - Google Patents

Abstract

The method for recognition of non-contact ID uses the echo check and enables a communication channel having multiple terminal in common. The apparatus includes a) microwave transmitter(32) which sends flag pattern and echo bit, b) radio frequency(RF) receiver(34) which receives the ID sent from a moving object, c) questioner(31) including the identifier(33) that identifies the ID received form the RF receiver, c) microwave receiver(36) which receives the flag pattern and echo bit sent from the questioner, d) RF transmitter(37) which sends its own ID synchronizing to the questioner according to the flag pattern received, e) storage of ID code(38) which store the ID sent form the RF transmitter, f) a number of answerer(35) including the controller(39) which controls the whole operating of the answerer according to flag pattern and echo bit sent from the questioner.

Description

Non-contact identification code recognition device and control method

1 is a block diagram of a conventional non-contact identification code recognition device.

2 is an explanatory diagram for explaining the multiple connection method according to the present invention.

3 is a block diagram of a non-contact identification code recognition device according to the present invention.

4 is a detailed block diagram of the responder controller of FIG. 3;

5 is a control flowchart of a contactless identification code recognition device according to the present invention.

* Explanation of symbols for the main parts of the drawings

31: interrogator 32: M / W transmitter

33: ID identification unit 34: RF receiver

35: answering machine 36: M / W receiver

37: RF transmitter 38: ID code storage unit

39: control unit 41,49: shift register

42: clock restoring section 43: flag code section

44: comparator 45,47: endgate

46: flip-flop 48: ID code portion

50: counter 51: multivibrator

52: Oagate

The present invention relates to an apparatus for recognizing a non-contact identification code (ID) and a control method thereof, and in particular, a non-contact identification code capable of multiple accesses, in which a plurality of terminals can share a communication channel by using an echo check method. A recognition apparatus and a control method thereof.

In today's society, the amount of distribution and traffic information increases day by day, and as a result, it is not possible to process such information by simple manual work.

In particular, non-contact recognition technology is a technology that detects various types of energy frames radiated or reflected from an object, and is applied to moving object identification (MOI) for all moving objects and AVI (Automatic Vechile Identification) for cars only. It is becoming.

1 is a schematic configuration of a conventional non-contact identification code (ID) recognition apparatus as described above. The answering machine 11 sends its identification code ID and the identification code sent from the responder 11. And an identifier 12 that receives and reads the ID, so that when the responder 11 sends the identifier ID to the identifier 12, the identifier 12 receives and recognizes the identifier ID. It is.

However, the conventional non-contact identification code recognition device as described above mainly targets objects moving along a fixed path, and uses a highly directional medium or close proximity (e.g. dozens) by electromagnetic induction to correspond one-to-one with an interrogator. Within cm), it is difficult to recognize freely moving objects by using the identification method.In addition, in order to recognize a plurality of moving objects, additional movement paths and recognition devices must be additionally installed, as well as interference between the recognition devices. There is a problem that bottlenecks occur at the point of recognition as it is easily affected by the speed of the moving object.

Accordingly, the present invention has been made to solve the above problems, and a multi-connection which can recognize a plurality of moving objects or fixed objects using a single recognition device as a target of recognition. It is an object of the present invention to provide an apparatus for recognizing a non-contact identification code (ID) and a control method thereof.

In order to achieve the above object, the present invention provides a microwave M / W transmitting unit for transmitting a flag pattern and echo bits, and an identification code (ID) transmitted from a moving object. An interrogator including a radio frequency (RF) receiver, an ID identifier for recognizing an identification code (ID) received through the RF receiver, and a flag pattern and an echo bit transmitted from the interrogator. A microwave (M / W) receiver for receiving, a radio frequency (RF) transmitter for transmitting its identification code (ID) in synchronization with an interrogator according to a flag pattern received from the M / W receiver, and the RF transmitter A plurality of ID codes including a control unit for controlling the operation of the entire transponder according to the flag pattern and echo bit transmitted from the interrogator, the ID code storage unit for storing the identification code (ID) transmitted through the interrogator Transponder Characterized in that is compared.

In addition, the present invention is a control method applied to the non-contact identification code recognition device having the above configuration, when the interrogator encodes a unique flag and sends it out in the OOK (On Off Keying) method, the responder in the recognizable area is the same; A first step of receiving and checking whether a flag pattern is matched, and if the flag pattern is matched in the first step, the answering machine sequentially transmits its identification code (ID) to the interrogator by OOK (On Off Keying) method. When the interrogator returns the identification code (ID) received from the interrogator in the second step to the responder according to the echo method, the responder matches the identification code (ID) sent by the responder using the received echo bit. In the third step of checking whether or not the ID transmitted from the third step is different from the echo bit, it is considered that a collision has occurred. Therefore, the responder immediately stops transmitting and the flag is received again. Waiting until, characterized in that when the identification code (ID) matches the echo bit is stopped (Idle Time) operating at a predetermined time, a fourth step of waiting to the other transponders to use the communication channel.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is an explanatory diagram for explaining a multiple access method according to the present invention. The present invention synchronizes a host (questioner) and a mobile object (responder). The identification code (ID) is transmitted using a OOK (On Off Keying) modulation method.

The identification code (ID) transmitted as described above is returned according to the echo check method. The identification code (ID) is used to determine whether or not there is interference between carriers to allow or cancel the use of the communication channel.

3 shows the configuration of the identification code (ID) recognition apparatus according to the present invention, and is largely divided into the interrogator 31 and the answering machine 35.

The interrogator 31 includes a microwave (M / W) transmitter 32 for transmitting a flag pattern and echo bits, and an identification code (ID) transmitted from the responder 35. A radio frequency (RF) receiver 34 for receiving and an ID identifier 33 for recognizing an identification code (ID) received through the radio frequency (RF) receiver 32 are provided.

On the other hand, the responder 35 receives a flag pattern and echo bits transmitted from the interrogator 31, and accordingly, a microwave (M / W) receiver 36 for triggering the responder, A radio frequency (RF) transmitter 36 for transmitting its own identification code (ID) in synchronization with the interrogator 31 according to the flag pattern received by the microwave (M / W) receiver 36, and the radio In the ID code storage unit 37 storing the identification code (ID) transmitted through the frequency (RF) transmitter 36 and the flag pattern and echo bit transmitted from the interrogator 31. And a control unit 39 for controlling the operation of the entire transponder.

FIG. 4 shows a detailed configuration of the control unit 39 of FIG. 3, which receives a clock restorer 42 which extracts a clock from the received data Rx DATA, and receives and receives the received data Rx DATA in parallel with each other. Comparator 44 which compares the flag code section 43 storing the shift register 41 and the flag code with the output of the flag code section 43 and the output of the shift register 41 to determine whether the flags match. And an identification code which stores an AND gate 45 for outputting a clock outputted to the clock recovery unit 42 and its own identification code ID only when the output of the comparator 44, that is, the flag matches. ID) A shift register for serially transmitting its own identification code (ID) stored in the identification code (ID) code part 48 in accordance with the clock signal output from the code part 48 and the AND gate 45 ( 49) and the echo output from the shift register 41 After transmitting all of the AND gate 47 and its ID without error and outputting a signal according to whether or not a bit matches the ID of the ID output from the shift register 49, Enters the idle mode, and when the idle time counter 50 and the idle time counter 50 that are counted according to the clock output from the AND gate 45 reach the set count, the idle time is driven. RF is determined depending on whether the monostable multivibrator 51 and the output of the AND gate 47, that is, the echo bit and its identification code ID match or the output of the monostable multivibrator 51. A flip-flop (F / F) 46 for turning on / off the operation of the transmitter 37 is provided.

Next will be described in detail the operation and effect of the present invention having the configuration as described above.

5 shows a control flowchart of the multiple access method according to the present invention. When the interrogator 31 sends out its own flag through Manchester coding in the OOK (On Off Keying) method, the responder 35 in the recognizable area is shown. The carrier senses a carrier to trigger the responder 35 (501), and supplies necessary power to the entire circuit constituting the responder 35 (502).

When the power is supplied as described above, the responder 35 checks a flag pattern transmitted from the interrogator 31 (503). If the flag patterns match, the responder 35 has its own identification code according to the reference clock synchronized with the interrogator. In step 504, the radio frequency (RF) is sequentially transmitted through the RF transmission unit 37.

The interrogator 31 immediately returns each bit of the received ID code to the responder (505), and the responder uses the echo bit sent as described above to send it to the responder. By checking whether the code bits match (506), it is determined whether there is a data collision on the communication channel.

In this case, if the ID code bit sent and the echo bit are different from each other, it is regarded as a collision, and immediately abandons transmission, waits until the flag is received again, and transmits all of the ID code bits without error. One responder stops (Idle Time) operation (508), giving the other responder the opportunity to use the communication channel for giving up transmission.

Therefore, changing the idle time changes the number of responders that can be recognized at the same time, which is determined by the speed of the moving object, the RF carrier and the data transmission speed.

As described above, the present invention can simultaneously recognize a plurality of terminals (responders) moving freely by using one host (questioner), and is not subject to spatial constraints due to additional facilities, and an efficient use of a communication channel. You can save all. In addition, since it can be implemented with simple hardware, it is possible to implement a low power consumption, small size, light weight terminal.

Claims (4)

A microwave (M / W) transmitter 32 for sending a flag pattern and echo bits, and a radio frequency (RF) receiver 34 for receiving an identification code (ID) transmitted from a moving object. , An interrogator (31) including an ID identifier (33) for recognizing an identification code (ID) received through the RF receiver (34), a flag (flag) pattern and echo transmitted from the interrogator (31) A microwave (M / W) receiving unit 36 for receiving an echo bit and a radio transmitting its own identification code in synchronization with the interrogator according to a flag pattern received from the M / W receiving unit 36. Flag (Flag) transmitted from the frequency (RF) transmission 0 unit 37, the ID code storage unit 38 storing the identification code (ID) transmitted through the RF transmitter 37, and the interrogator 31 And a plurality of transponders 35 including a control unit 39 for controlling the operation of the entire transponder according to the pattern and the echo bit. Non-contact identification code reader for a. The control unit (39) of claim 1, wherein the control unit (39) receives a clock restoring unit (42) for extracting a clock from the received data (Rx DATA), and a shift register (41) for receiving and receiving the received data (Rx DATA) in series and parallel conversion. ; A flag code section 43 that stores a flag code; A comparator 44 for comparing the output of the flag code section 43 with the output of the shift register 41 to determine whether the flags match; An AND gate 45 for outputting a clock output from the clock restorer 42 according to the output of the comparator 44; An identification code (ID) code part 48 which stores its identification code (ID); A shift register (49) which serially transmits its own identification code (ID) stored in the identification code (ID) code part 48 in accordance with the clock signal output from the AND gate 45; An AND gate (47) for outputting a signal depending on whether or not the echo bit output from the shift register (41) and its identification code (ID) output from the shift register (49) match each other; Idle Time Counter (50) counted according to the clock output from the AND gate 45 to enter the idle mode for a certain time after transmitting all of its ID without error, the idle time A monostable multivibrator 51 which drives when the counter 50 reaches a set count to determine an idle time; In accordance with the output of the AND gate 47 or the output of the monostable multivibrator 51, the RF transmitter 37 is provided with a flip-flop (F / F) 46 to turn on / off operation Contactless identification code recognition device. A microwave (M / W) transmitter 32 for sending a flag pattern and echo bits, and a radio frequency (RF) receiver for receiving an identification code (ID) transmitted from a moving object ( 34) and an interrogator 31 including an ID identifier 33 for recognizing an identification code (ID) received through the RF receiver 34 and a flag pattern transmitted from the interrogator 31. And a microwave (M / W) receiving unit 36 for receiving echo bits, and synchronizing the interrogator according to a flag pattern received from the M / W receiving unit 36 to identify its ID. A flag transmitted from the radio frequency (RF) transmitting unit 37, an ID code storing unit 38 storing an identification code (ID) transmitted through the RF transmitting unit 37, and the interrogator 31. The plurality of responders 35 including the control unit 39 for controlling the operation of the entire responder according to the (Flag) pattern and the echo bit In the control method applied to the non-contact identification code recognition device, when the interrogator encodes a unique flag and sends it out by OOK (On Of Keying) method, the responder in the recognizable area receives it and checks whether the flag pattern matches. First step (501 to 503) to make; A second step 504 of sending, by the responder, an identifier (ID) to the interrogator in a OOK (On Off Keying) method sequentially when the flag pattern is matched in the first step; When the interrogator returns the identification code (ID) received from the interrogator in the second step to the responder according to the echo method, the answering machine checks whether the responder matches the identification code (ID) to be transmitted by using the received echo bit. In the third step (505 to 507), if the identification code (ID) transmitted in the third step is different from the echo bit, a collision has occurred and the responder immediately stops transmitting and waits until the flag is received again. And a fourth step (508) of stopping the idle time operation when the ID) coincides with the echo bit and waiting for another responder to use the communication channel. Way. 4. The method of claim 3, wherein the first step comprises: a fifth step (501) of triggering and receiving a responder in a recognizable area when the interrogator encodes a unique flag and sends it in a OOK (On Off Keying) method; And a sixth step (502) of supplying power to the entire circuit constituting the responder when the transponder is triggered in the fifth step.