Radio frequency identification test system

Abstract

The invention relates to the technical field of radio frequency identification, in particular to a radio frequency identification test system which comprises a switch conversion matrix, a radio frequency identification host, a full anechoic chamber and a cabinet front panel interface. The radio frequency identification host comprises an embedded controller, a radio frequency signal transceiver, a carrier offset module, a combiner and an interference signal generator; the switch conversion matrix comprises a label reader-writer test selection module, a label test type selection module, a label test module and a reader-writer test module; switching can be automatically carried out according to test types, the efficiency is high, the problem that the test system demodulates part of label return signals difficultly due to carrier leakage existing among multiple antennas connected with the test system is solved through the carrier offset module, and the receiving sensitivity of the test system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wireless radio frequency identification, and in particular relates to a radio frequency identification test system. Background Art

[0002] Radio Frequency Identification (RFID) technology is a non-contact automatic identification technology (hereinafter referred to as RFID technology) that uses radio frequency identification (RFID) communication. It has the characteristics of fast reading and writing, non-visual identification, mobile identification, multi-target identification, positioning and long-term tracking management. As a high-tech technology that processes information quickly, timely and accurately and the basis of information standardization, RFID technology is listed as one of the top ten important technologies in the 21st century. It has been applied in manufacturing, logistics, medical care, transportation, retail, aviation and other fields, and currently has a good market prospect. Therefore, it is becoming more and more important to test radio frequency identification products and ensure the quality of radio frequency identification (RFID) products.

[0003] Common RFID test types include RFID reader test and RFID tag test; RFID reader test includes performance test, communication protocol test and other test types; RFID tag test includes performance test, communication protocol test, anti-interference test and other test types. The above different types of tests have different test system compositions and connection methods with the object under test. If the test is to be completed, either a different test system is used, which requires a lot of equipment costs and the test system must be replaced for the same batch of samples; or a comprehensive test system is used to manually change the internal modules of the test system and the connection method between the test system and the object under test. Although this method saves costs, it is time-consuming and prone to errors. At the same time, there is carrier leakage between the multiple antennas connected to the RFID test system, which makes it difficult for the test system to demodulate the return signals of some tags and reduces the receiving sensitivity of the test system. Summary of the invention

[0004] In order to solve the problems in the existing radio frequency identification test technology that, when performing different types of tests, the manual switching process is time-consuming and prone to errors, and there is carrier leakage between multiple antennas connected to the radio frequency identification test system, signal demodulation is difficult, and the receiving sensitivity of the test system is reduced, the present invention provides a radio frequency identification test system, which can automatically switch according to the test type and has high efficiency. Moreover, through a carrier cancellation module, the problem that the test system has difficulty in demodulating part of the tag return signals due to carrier leakage between multiple antennas connected to the test system is solved, and the receiving sensitivity of the test system is improved.

[0005] The technical solution of the present invention is as follows:

[0006] A radio frequency identification test system, comprising a switch conversion matrix, a radio frequency identification host, a full anechoic chamber and a cabinet front panel interface;

[0007] The RFID host includes an embedded controller, a RF signal transceiver, a carrier cancellation module, a combiner and an interference signal generator;

[0008] The switch conversion matrix includes a tag reader test selection module, a tag test type selection module, a tag test module, and a reader test module;

[0009] The embedded controller is connected to the radio frequency signal transceiver via an electrical signal, the output end of the radio frequency signal transceiver is connected to the combiner, and the input end of the radio frequency signal transceiver is connected to the radio frequency output port of the carrier cancellation module;

[0010] The output end of the interference signal generator is connected to a combiner, and the combiner is connected to a radio frequency input end of a carrier cancellation module;

[0011] The tag reader / writer test selection module is connected to the input end of the reader / writer test module, and the output end of the reader / writer test module is connected to the tag test type selection module;

[0012] The tag reader / writer test selection module is also connected to the communication serial port of the tag test type selection module;

[0013] The label test type selection module is connected to the input end of the label test module, and the output end of the label test module is connected to the label test type selection module;

[0014] The tag test type selection module is connected to the transmitting end of the full anechoic chamber, and the receiving end of the full anechoic chamber is connected to the tag test type selection module;

[0015] The label test type selection module is connected to the test interface of the cabinet front panel interface.

[0016] The full anechoic chamber is connected to the tag testing module;

[0017] The input and output ends of the cabinet front panel interface are connected to the tag test type selection module, and the cabinet front panel interface is also connected to the reader / writer test module;

[0018] The tag test type selection module is connected to the antenna signal input end of the carrier cancellation module, and the antenna signal output end of the carrier cancellation module is connected to the communication serial port of the tag reader / writer test selection module.

[0019] Preferably, the reader / writer test module is specifically a reader / writer test routing box, and the reader / writer test routing box is used to implement radio frequency identification reader / writer testing.

[0020] Preferably, the reader / writer test module is specifically a reader / writer test routing box, and the reader / writer test routing box is used to implement radio frequency identification reader / writer testing.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The RFID test system designed by the present invention realizes multiple test types such as RFID reader performance test, communication protocol test, RFID tag performance test, communication protocol test, TIPP test, anti-interference test, etc. on a set of comprehensive test systems. And the automatic line switching of the above different test types is realized through the switch matrix, which saves costs and facilitates testing. At the same time, through the carrier cancellation module, the problem that the test system has difficulty in demodulating part of the tag return signal due to carrier leakage between multiple antennas connected to the test system is solved, and the receiving sensitivity of the test system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the radio frequency identification host of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the switch conversion matrix;

[0025] Figure 3 Schematic diagram of the switch conversion software interface of the radio frequency identification host of the present invention

[0026] In the figure: 1- tag reader test selection module, 2- tag test type selection module, 3- tag test module, 4- reader test module, 5- RFID host, 51- embedded controller, 52- RF signal transceiver, 53- carrier cancellation module, 54- combiner, 55- interference signal generator, 6- full radio wave darkroom, 7- cabinet front panel interface, 8- switch conversion matrix. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] See also Figure 1-2 , a radio frequency identification test system, comprising a switch conversion matrix, a radio frequency identification host, a full anechoic chamber 6 and a cabinet front panel interface 7;

[0029] The RFID host 5 includes an embedded controller 51, a RF signal transceiver 52, a carrier cancellation module 53, a combiner 54 and an interference signal generator 55;

[0030] The switch conversion matrix 8 includes a tag reader test selection module 1, a tag test type selection module 2, a tag test module 3, and a reader test module 4;

[0031] The embedded controller 51 is connected to the RF signal transceiver 52 via electrical signals, the output end of the RF signal transceiver 52 is connected to the combiner 54, and the input end of the RF signal transceiver 52 is connected to the RF output port of the carrier cancellation module 53;

[0032] The output end of the interference signal generator 55 is connected to the combiner 54, and the combiner 54 is connected to the RF input end of the carrier cancellation module 53;

[0033] The tag reader / writer test selection module 1 is connected to the input end of the reader / writer test module 4, and the output end of the reader / writer test module 4 is connected to the tag test type selection module 2;

[0034] The tag reader / writer test selection module 1 is also connected to the communication serial port of the tag test type selection module 2;

[0035] The label test type selection module 2 is connected to the input end of the label test module 3, and the output end of the label test module 3 is connected to the label test type selection module 2;

[0036] The tag test type selection module 2 is connected to the transmitting end of the full anechoic chamber 6, and the receiving end of the full anechoic chamber 6 is connected to the tag test type selection module 2;

[0037] The full anechoic chamber 6 is connected to the tag testing module 3;

[0038] The input and output ends of the cabinet front panel interface 7 are connected to the tag test type selection module 2, and the cabinet front panel interface 7 is also connected to the reader / writer test module 4;

[0039] The tag test type selection module 2 is connected to the antenna signal input end of the carrier cancellation module 53 , and the antenna signal output end of the carrier cancellation module 53 is connected to the communication serial port of the tag reader / writer test selection module 1 .

[0040] In the present invention, the embedded controller includes an embedded processor and an operating system, which provides computing power and controls the radio frequency signal transceiver.

[0041] The radio frequency signal transceiver can realize the generation, reception and analysis of radio frequency signals.

[0042] The interference signal generator can realize the generation of interference signals during the anti-interference test of the tag.

[0043] The combiner can combine normal radio frequency signals and interfering radio frequency signals.

[0044] The carrier cancellation module can solve the problem that carrier leakage between multiple antennas connected to the test system makes it difficult for the test system to demodulate some tag return signals, thereby improving the receiving sensitivity of the test system. Its working principle can be found in the carrier cancellation device with publication number CN102902939B, which is used in this application.

[0045] The switch conversion matrix can realize automatic line switching between tag testing and reader-writer testing and different tag test types.

[0046] The cabinet front panel interface is used to achieve connection with the antenna or the reader / writer under test from the cabinet front panel.

[0047] In one embodiment of the present invention, the tag testing module is a tag testing routing box, which is used to implement signal routing of different connection modes for RFID tag testing.

[0048] In one embodiment of the present invention, the reader / writer test module is specifically a reader / writer test routing box, which is used to implement signal routing for radio frequency identification reader / writer testing.

[0049] The Reader Test interface on the front panel of the cabinet is connected to the 7X / RX communication serial port of the reader test routing box.

[0050] The tag reader / writer test selection module realizes the selection and signal conduction between the RFID reader / writer and the RFID tag test;

[0051] The tag test type selection module realizes the selection and signal conduction of different test types such as RFID tag performance test, consistency test, TIPP test, etc.

[0052] In the present invention, the RFID host is installed with switch conversion software for allowing the tester to select the test mode from the software interface, such as Figure 2 shown.

[0053] The present invention has the following working principle:

[0054] See also Figure 1-2When performing a radio frequency identification (RFID) reader / writer test, the Reader Test interface on the front panel of the cabinet is connected to the reader / writer under test, and the signal sent by the reader / writer under test reaches the Tx / Rx port of the reader / writer test module through the Reader Test interface, and then the signal will be conducted to the COMB port of the tag test type selection module, and then output to the ANT IN port of the carrier cancellation module, and the signal is output from the RF OUT port of the carrier cancellation module 53 to the IN port of the radio frequency signal transceiver. The radio frequency signal transceiver analyzes the signal sent by the reader / writer, and displays the signal and the analysis result in the radio frequency identification (RFID) reader / writer test software installed in the embedded controller, and at the same time simulates the RFID tag to respond to the signal sent by the reader / writer, thereby completing the reader / writer test.

[0055] See also Figure 1 When the RFID tag performance test is performed, the RFID reader test software installed in the embedded controller controls the RF signal transceiver to send a signal. The signal passes through the combiner 54 and reaches the RF IN port of the carrier cancellation module 53. Then, the signal is output to the COM port of the tag reader test selection module 1 through the ANT OUT port of the carrier cancellation module. Then, the signal will be conducted to the CH4A port of the tag test type selection module 2, and the signal will be directly output to the RF interface f (transmitter) of the full anechoic chamber 6. The RF interface f (transmitter) of the full anechoic chamber 6 is connected to the transmitting antenna, and the signal can be sent to the tag under test through the air interface. The signal returned from the tag under test is received by the receiving antenna connected to the RF interface e (receiving end) of the full anechoic chamber 6 through the air interface, and then output to the CH5B port of the tag test type selection module 2. The tag response signal reaching the switch conversion matrix is ​​conducted to the COMB port of the tag test type selection module 2, then output to the ANT IN port of the carrier cancellation module 53, and then output from the RF OUT port to the IN port of the RF signal transceiver 52. The carrier cancellation module 53 cancels most of the coupling interference caused by carrier leakage between the transmitting and receiving antennas, so that the quality of the tag response signal reaching the RF signal transceiver is improved, which is beneficial for the RF signal transceiver 52 to analyze the tag response signal. After analyzing the tag response signal, the RF signal transceiver 52 displays the signal and the analysis result in the RFID reader test software installed in the embedded controller, thereby completing the tag performance test.

[0056] See also Figure 1When the radio frequency identification (RFID) tag anti-interference test is performed, the radio frequency identification (RFID) reader test software installed in the embedded controller 51 controls the radio frequency signal transceiver 52 to transmit a normal signal, and controls the interference signal generator 55 to send an interference signal. The normal signal and the interference signal are combined into one signal by the combiner and arrive at the RF IN port of the carrier cancellation module 53, and then output to the COM port of the tag reader test selection module 1 through the ANT OUT port of the carrier cancellation module 53, and then the signal will be conducted to the CH4A port of the tag test type selection module, and the signal will be directly output to the radio frequency interface f (transmitter) of the full radio wave darkroom 6. The radio frequency interface f (transmitter) of the full radio wave darkroom 6 is connected to the transmitting antenna, and the signal can be sent to the tested tag through the air interface. The signal returned from the tested tag is received by the receiving antenna connected to the radio frequency interface e (receiving end) of the full radio wave darkroom 6 through the air interface, and then output to the CH5B port of the tag test type selection module 2. The tag response signal reaching the switch conversion matrix is ​​conducted to the COMB port of the tag test type selection module 2, and then output to the ANT IN port of the carrier cancellation module 53, and then output from the RF OUT port of the carrier cancellation module 53 to the IN port of the RF signal transceiver 52. The carrier cancellation module 53 offsets most of the coupling interference caused by carrier leakage between the transceiver antennas, so that the quality of the tag response signal reaching the RF signal transceiver is improved, which is conducive to the RF signal transceiver to analyze the tag response signal. After the RF signal transceiver 52 analyzes the tag response signal, the signal and the analysis result are displayed in the RFID reader test software installed in the embedded controller, thereby completing the tag anti-interference test.

[0057] When the radio frequency identification (RFID) tag communication protocol test is performed, the radio frequency identification (RFID) reader test software installed in the embedded controller 51 controls the radio frequency signal transceiver to send a signal, and the signal reaches the RF IN port of the carrier cancellation module 53 after passing through the combiner, and is output to the COM port of the tag reader test selection module 1 through the ANT OUT port of the carrier cancellation module 53, and then the signal will be conducted to the CH6A port of the tag test type selection module 2, and then output to the OUT (Tag Test) port of the cabinet front panel interface 7. The OUT (Tag Test) port is connected to a dipole antenna, and the dipole antenna sends the signal to the tag under test through the air interface. The signal returned from the tag under test is received by another dipole antenna connected to the IN (Tag Test) port of the cabinet front panel interface 7 through the air interface, and then output to the CH6B port of the tag test type selection module 2. The signal reaching the switch conversion matrix is ​​conducted to the COMB port of the tag test type selection module 2, and then output to the ANT IN port of the carrier cancellation module 53, and then output from the RF OUT port of the carrier cancellation module 53 to the IN port of the RF signal transceiver. The carrier cancellation module 53 cancels most of the coupling interference caused by carrier leakage between the two dipole antennas, so that the quality of the tag response signal reaching the RF signal transceiver is improved, which is beneficial for the RF signal transceiver 52 to analyze the tag response signal. After analyzing the tag response signal, the RF signal transceiver 52 displays the signal and the analysis result in the RFID reader test software installed in the embedded controller, thereby completing the tag communication protocol test.

[0058] See also Figure 1-3When conducting the RFID tag TIPP test, the tester selects the tag test-single antenna one, single antenna two, single antenna three, single antenna four on the switch conversion software, and the signal sent by the RFID test system will be conducted to the COM port of the tag reader test selection module 1, and then the signal will be conducted to the CH0 port of the tag reader test selection module 1, and then output to the COMA port of the tag test type selection module 2, and then the signal will be conducted to the four ports of CH0A, CH1A, CH2A, and CH3A, and the signal will be output to the four ports of IN1, IN2, IN3, and IN4 of the tag test routing box (i.e., the tag test module 3), and the signal will be conducted to the four ports of ANT1, ANT2, ANT3, and ANT4 after passing through the inside of the tag test routing box, and then output to the RF interface a, RF interface b, RF interface c, and RF interface d of the full anechoic chamber 6. The RF interface a, RF interface b, RF interface c, and RF interface d of the full anechoic chamber 6 are respectively connected to the four antennas of the transceiver, and the signal can be sent to the tested tag through the air interface. The signal returned from the tested tag is received by four antennas through the air interface, and then output to the ANT1, ANT2, ANT3 and ANT4 ports of the tag test routing box through the RF interface a, RF interface b, RF interface c and RF interface d of the full anechoic chamber 6. After passing through the inside of the tag test routing box, the signal is conducted to its OUT1, OUT2, OUT3 and OUT4 ports, and then output to the CH0B, CH1B, CH2B and CH3B ports of the tag test type selection module 2. The signal reaching the tag test type selection module 2 is conducted to the COMB port, and then output to the IN port of the carrier offset module 53. The RFID test system analyzes the signal returned by the tag, thereby completing the tag TIPP test.

[0059] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A radio frequency identification test system, characterized in that: Includes switch conversion matrix, RFID host, full anechoic chamber and cabinet front panel interface; The RFID host includes an embedded controller, a RF signal transceiver, a carrier cancellation module, a combiner and an interference signal generator; The switch conversion matrix includes a tag reader test selection module, a tag test type selection module, a tag test module, and a reader test module; The embedded controller is connected to the radio frequency signal transceiver via an electrical signal, the output end of the radio frequency signal transceiver is connected to the combiner, and the input end of the radio frequency signal transceiver is connected to the radio frequency output port of the carrier cancellation module; The output end of the interference signal generator is connected to a combiner, and the combiner is connected to a radio frequency input end of a carrier cancellation module; The tag reader / writer test selection module is connected to the input end of the reader / writer test module, and the output end of the reader / writer test module is connected to the tag test type selection module; The tag reader / writer test selection module is also connected to the communication serial port of the tag test type selection module; The label test type selection module is connected to the input end of the label test module, and the output end of the label test module is connected to the label test type selection module; The tag test type selection module is connected to the transmitting end of the full anechoic chamber, and the receiving end of the full anechoic chamber is connected to the tag test type selection module; The tag test type selection module is connected to the test interface of the cabinet front panel interface, and the full anechoic chamber is connected to the tag test module; The input and output ends of the cabinet front panel interface are connected to the tag test type selection module, and the cabinet front panel interface is also connected to the reader / writer test module; The tag test type selection module is connected to the antenna signal input end of the carrier cancellation module, and the antenna signal output end of the carrier cancellation module is connected to the communication serial port of the tag reader / writer test selection module.

2. The RFID test system according to claim 1, characterized in that: The reader / writer test module is specifically a reader / writer test routing box, and the reader / writer test routing box is used to implement radio frequency identification reader / writer testing.

3. The RFID test system according to claim 1, characterized in that: The reader / writer test module is specifically a reader / writer test routing box, and the reader / writer test routing box is used to implement radio frequency identification reader / writer testing.

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