System and method for automatically testing transponder and medium

Abstract

The invention relates to a transponder automatic test system and method and a medium. Hardware comprises a signal generator, a radio frequency power amplifier, a test antenna, a power meter, a low-pass filter, a spectrum analyzer, an oscilloscope, a transponder read-write tool, a C interface test signal generator and a computer. According to the system and the method provided by the invention, the industrial production automation level can be improved, the test efficiency and the accuracy of test results can be improved, and the quality stability and consistency of transponder products can be improved.

Description

Technical Field

[0001] The present invention relates to the field of rail transportation technology, and in particular to a transponder automatic testing system, method and medium. Background Art

[0002] Currently, transponder transmission systems are widely used in various types of rail transit as secure point-to-point information transmission systems. These point-to-point devices utilize the principle of electromagnetic induction to enable direct data transmission between the ground and the train. The transponder receives the downlink energy signal from the onboard antenna unit at the bottom of the train through its receiving antenna, converts this energy signal into operating power for the device, and then transmits a frequency shift keying (FSK) uplink signal to the onboard antenna unit at the bottom of the train via its operating circuit and transmitting antenna.

[0003] Currently, during the production, debugging and testing process of transponders, the detection of transponders mainly relies on manual testing or semi-automatic testing, with a low level of automation. The test results are affected by the technical level and subjective judgment of the testers. Product quality and parameter consistency rely too much on external subjective factors, resulting in unstable product quality and restricting large-scale production.

[0004] Due to the large number of transponder test items specified in the "TB / T 3544-2018 Transponder Transmission System Test Specification", the complex test system and the difficulty of operation, the current transponder production test items cannot cover the main test items specified in the standard. Summary of the Invention

[0005] The present invention designs a transponder automatic testing system, method and medium. The technical problem it solves is that existing testing mainly relies on manual or semi-automatic equipment. Testers need to frequently operate instruments (such as signal generators and spectrum analyzers) and subjectively judge the test results, resulting in low test efficiency, poor result consistency and difficulty in covering all project tests.

[0006] In order to solve the above-mentioned technical problems, the present invention adopts the following solutions:

[0007] A transponder automatic test system, characterized in that it includes: a signal generator for generating a downlink energy signal for activating a transponder; a radio frequency power amplifier for amplifying the signal output by the signal generator; a test antenna including a 27.095 MHz energy signal transmitting antenna, a first uplink signal receiving antenna and a second uplink signal receiving antenna, for transmitting an activation signal and receiving an uplink signal from the transponder; a power meter for monitoring the signal power transmitted by the 27.095 MHz energy signal transmitting antenna; a low-pass filter for filtering out the 27.095 MHz energy signal in the uplink signal; a spectrum analyzer for measuring the power of the uplink signal; an oscilloscope for collecting and analyzing the electrical characteristics of the uplink signal; a transponder reading and writing tool for modifying and verifying the transponder's message; a C-interface test signal generator for generating the C-interface signal required for active transponder testing; and a computer for controlling the above-mentioned test equipment and processing test data.

[0008] Preferably, the computer controls the frequency and amplitude output by the signal generator and reads the reading of the power meter to keep the output power consistent within the frequency band of 27.095MHz±1MHz, and determines the resonance point of the transponder by reading the uplink signal power detected by the spectrum analyzer.

[0009] Preferably, the computer determines the resonance point by controlling the frequency of the signal generator to sweep within the range of 27.095MHz±1MHz, and adjusting the signal amplitude so that the radio frequency energy sent by the test antenna is Φ d1 -2dB, the frequency point corresponding to the maximum value of the uplink signal power is detected by a spectrum analyzer, which is the resonance point of the transponder, Φ d1 It is the reference magnetic flux value in transponder testing.

[0010] Preferably, the computer controls the signal generator to output a signal with a frequency of 27.095 MHz, adjusts the signal amplitude to generate the energy required for different IO test points, detects the power of the uplink signal through a spectrum analyzer, calculates the loop current, and completes the IO characteristic test of the transponder.

[0011] Preferably, the computer directly acquires the uplink signal by controlling the oscilloscope, extracts valid data using a filtering algorithm, and analyzes the center frequency, frequency offset, amplitude jitter, average data rate, and MTIE (Maximum Time Interval Error) of the uplink signal. MTIE is classified as MTIE1 or MTIE2.

[0012] Preferably, the active transponder control interface characteristic test generates a specific signal by controlling the C-interface test signal generator through the computer, and performs the test in accordance with the requirements of the "TB / T 3544-2018 Transponder Transmission System Test Specification".

[0013] Preferably, the computer controls the transponder reading and writing tool to modify and verify the default message of the transponder and write specific message data for various tests.

[0014] A transponder automatic testing method and a transponder automatic testing system thereof include the following steps:

[0015] Step 1: Use a computer to control the signal generator to output a 27.095MHz signal, which is amplified by the RF power amplifier and then sent to the transponder through the test antenna;

[0016] Step 2: Monitor the power of the transmitted signal using a power meter and adjust the signal generator output to meet the test requirements.

[0017] Step 3: Receive the uplink signal of the transponder through the test antenna, filter out the interference signal through a low-pass filter, and then analyze the signal with a spectrum analyzer or oscilloscope;

[0018] Step 4: The computer calculates the test results according to the preset algorithm, compares them with the standard values, and generates a test report.

[0019] Preferably, the transponder automatic testing method further comprises: controlling a C-interface test signal generator by a computer to generate a specific signal for testing the control interface characteristics of the active transponder; and modifying and verifying the transponder message by a transponder reading and writing tool.

[0020] A transponder energy receiving antenna resonance point test method using the above transponder automatic test system includes the following steps: Step 1, placing the transponder to be tested above the test antenna and writing a preset message using a transponder reading and writing tool; Step 2, computer-controlled signal generator sweep frequency within the range of 27.095MHz±1MHz, adjusting the signal amplitude so that the radio frequency energy sent by the test antenna is Φ d1 -2dB; Step 3, monitor the signal strength through a power meter, and detect the uplink signal power through a spectrum analyzer; Step 4, determine the frequency corresponding to the maximum uplink signal power as the resonant point of the transponder.

[0021] A transponder IO characteristic test method using the above-mentioned transponder automatic test system includes the following steps: Step 1, placing the transponder to be tested above the test antenna and writing a preset message using a transponder reading and writing tool; Step 2, controlling the signal generator with a computer to output a 27.095 MHz signal and adjusting the amplitude to comply with the P specified in TB / T 3544-2018. cs Bias value; Step 3, monitor the signal strength with a power meter and detect the uplink signal power with a spectrum analyzer; Step 4, calculate the loop current and compare it with the standard value to complete the IO characteristic test.

[0022] A transponder uplink signal characteristics testing method, which uses the above-mentioned transponder automatic test system, includes the following steps: Step 1, placing the transponder to be tested above the test antenna, and writing a preset message using a transponder reading and writing tool; Step 2, controlling a signal generator with a computer to output a 27.095 MHz signal, and adjusting the amplitude to meet the magnetic flux level specified in "TB / T 3544-2018"; Step 3, acquiring the uplink signal using an oscilloscope, and analyzing the center frequency, frequency offset, amplitude jitter, average data rate, and MTIE.

[0023] A method for testing the control interface characteristics of an active transponder, using the above-mentioned transponder automatic test system, comprises the following steps: Step 1, connecting the active transponder to be tested to a C-interface test signal generator and writing a preset message; Step 2, controlling the C-interface test signal generator with a computer to output a specific signal that meets the requirements of "TB / T 3544-2018"; Step 3, performing an uplink signal characteristic test to analyze whether the signal parameters meet the standard.

[0024] A computer-readable storage medium is characterized in that: a computer program is stored therein, and the computer program implements the above-mentioned testing method when executed by a processor.

[0025] The transponder automatic testing system, method and medium have the following beneficial effects:

[0026] (1) The system and method provided by the present invention can improve the level of industrial production automation, increase test efficiency and the accuracy of test results, and improve the quality stability and consistency of transponder products.

[0027] (2) The automatic transponder testing system and method provided by the present invention can replace manual testing methods and tools, reduce the influence of subjective factors and environmental factors in production, improve the level of industrial automation, reduce manual participation, further ensure the accuracy and reliability of test results, and improve the quality and stability of transponder products.

[0028] (3) The test items of the present invention are closer to those specified in the standard, which can more effectively detect the index characteristics of the transponder product. By automatically testing all items, the complexity and operation difficulty of the test system are reduced, the labor intensity and dependence on manual labor are reduced, and the production efficiency and large-scale production capacity of the transponder are improved.

[0029] (4) The present invention centrally controls all test equipment (signal generator, power meter, spectrum analyzer, etc.) through a computer, automatically performs frequency sweeping, signal adjustment, data acquisition and analysis, eliminates manual intervention, and realizes full-process automated testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the structure of the automatic test system of the transponder of the present invention;

[0031] Figure 2 Flowchart of the transponder testing process designed for use within a computer;

[0032] Figure 3 Schematic diagram of the transponder energy receiving antenna resonance point test process of the present invention;

[0033] Figure 4 Schematic diagram of the IO characteristic test process of the present invention;

[0034] Figure 5 Schematic diagram of the uplink signal characteristic test process of the present invention;

[0035] Figure 6 Schematic diagram of the active transponder control interface characteristic measurement process of the present invention;

[0036] Figure 7 Schematic diagram of the overall structure of the test antenna of the present invention;

[0037] Figure 8 This is a schematic diagram of the structure of the 27.095MHz energy signal transmitting antenna and the first uplink signal receiving antenna in the present invention;

[0038] Figure 9 It is a structural diagram of the second uplink signal receiving antenna in the present invention.

[0039] Description of reference numerals:

[0040] 20—27.095 MHz energy signal transmitting antenna; 21—Second uplink signal receiving antenna; 211—4.23 MHz modified receiving loop; 212—4.23 MHz transformer; 22—First uplink signal receiving antenna; 221—4.23 MHz loop; 223—27.095 MHz transformer; 224—Current detection transformer; 225—4.23 MHz transformer; 23—Current probe; 24—Balun; 25—Coaxial cable; 26—Plastic support; 27—Shielded aluminum plate; 31—RF power amplifier terminal; 32—Power meter terminal; 33—Spectrum analyzer terminal; 34—Oscilloscope terminal. DETAILED DESCRIPTION

[0041] The following combination Figures 1 to 9 , the present invention is further described:

[0042] like Figure 1 As shown, a transponder automatic test system includes a signal generator that outputs a source signal that activates the transponder to be tested; a radio frequency power amplifier that amplifies the source signal output by the signal generator; a test antenna that radiates the energy signal that activates the transponder to the transponder to be tested and simultaneously receives the uplink signal output by the transponder to be tested; a power meter for monitoring the power of the signal transmitted by the 27.095 MHz energy signal transmitting antenna in the test antenna; a low-pass filter that filters out the energy signal that activates the transponder and retains the uplink signal output by the transponder; a spectrum analyzer for collecting the spectrum and signal strength of the uplink signal; a transponder reading and writing tool for wirelessly reading and writing transponder messages; a C-interface test signal generator for outputting various C-interface signals that meet requirements; an oscilloscope for real-time sampling of the uplink signal; and a computer as the control center of the test system that controls various instruments and test equipment to automatically execute test steps, simultaneously records test data, calculates the results of each test item according to the calculation algorithm preset for each test item, compares the results with preset conditions to determine whether the test results meet the requirements, and automatically generates a test report based on the test results.

[0043] The system and method provided by the present invention can improve the level of industrial production automation, increase test efficiency and the accuracy of test results, and improve the quality stability and consistency of transponder products.

[0044] Specifically, the functions of each component are as follows:

[0045] Computer (control software): used to control the operation of each device, realize automatic testing, and process the data from each device. It calculates the test results obtained from different cases according to the test cases, and compares them with the indicators required by the transponder technical specifications to determine whether the test results meet the requirements. At the same time, it automatically generates a test report to realize automated testing of the transponder.

[0046] The signal generator generates downlink energy signals of various frequencies and amplitudes for testing the resonance point of the transponder 10 and the transponder energy receiving antenna.

[0047] RF power amplifier: amplifies the RF signal output by the signal generator to meet the test requirements.

[0048] Test antenna: Consists of three parts: a 27.095MHz energy signal transmitting antenna, a first uplink signal receiving antenna, and a second uplink signal receiving antenna. The 27.095MHz energy signal transmitting antenna transmits the 27.095MHz signal amplified by the RF power amplifier to the transponder to activate it. The first uplink signal receiving antenna receives the uplink signal from the transponder for I / O testing, and the second uplink signal receiving antenna receives the uplink signal from the transponder for uplink signal electrical characteristics testing.

[0049] Low-pass filter: Filters out 27 MHz RF energy signals from the signal received by the first uplink signal receiving antenna in the test antenna, retaining the uplink signal.

[0050] Spectrum analyzer: receives the uplink signal after the 27 MHz frequency is filtered out by low-pass filter 6, and measures the power of the uplink signal.

[0051] Oscilloscope: collects the uplink signal received by the second uplink signal receiving antenna in the test antenna and collects data according to the set sampling frequency and sampling depth.

[0052] Transponder reading and writing tool: reads or writes transponder messages;

[0053] Power meter: collects the 27.095 MHz energy signal from the test antenna and the signal power transmitted by the transmitting antenna.

[0054] The C-interface test signal generator generates C-interface signals for active transponder testing. The computer controls the state of the C-interface signal transmission: maximum or minimum energy, highest or lowest average data rate, and return loss state: capacitive, inductive, high resistance, or low resistance.

[0055] The automatic transponder test system of the present invention is divided into two cases: passive transponder test and active transponder test. The passive transponder can test the transponder's energy receiving antenna operating resonance point, IO characteristics, uplink signal electrical characteristics (Chapter D6 Uplink Signal Characteristics of "TB / T 3544-2018 Transponder Transmission System Test Specification") and the transponder's message reading and writing functions; the active transponder can also test the active transponder control interface characteristic measurement in addition to the above test items (Chapter D7 of "TB / T3544-2018 Transponder Transmission System Test Specification": Active transponder control interface characteristic measurement).

[0056] like Figure 2 As shown, the transponder testing process designed in the computer:

[0057] First, place the transponder reader / writer tool directly above the transponder and use computer software to control the reader / writer to write a specific target message. After writing, read the message to confirm that the written message is correct. After the transponder message reading and writing function test is completed, remove the transponder reader / writer tool from above the transponder.

[0058] The resonant point test of the transponder energy receiving antenna is carried out by controlling the signal generator through computer software to output the downlink energy signal. After being amplified by the RF power amplifier, the energy signal is sent to the transponder by the 27.095MHz energy signal transmitting antenna of the test antenna, and the transmission strength of the signal is detected by a power meter. The software controls the signal generator to output the corresponding energy signal according to the set test algorithm based on the detected signal strength. The uplink signal sent by the transponder is received by the first uplink signal receiving antenna in the test antenna, and the signal strength is detected by a spectrum analyzer. The computer obtains the uplink signal transmission strength of the transponder by collecting the uplink signal power received on the spectrum analyzer. The signal generator output signal frequency corresponding to the maximum power value obtained on the spectrum is the resonant point of the transponder energy receiving antenna.

[0059] The transponder IO characteristic test uses computer software to control the signal generator to output the downlink energy signal. The frequency of the energy signal is 27.095MHz, and the amplitude is based on the P specified in Table D.1 of the "TB / T 3544-2018 Transponder Transmission System Test Specification". csThe offset value corresponds to the amplitude of the signal generator output, that is, the signal strength sent by the 27.095MHz energy signal transmitting antenna after passing through the RF power amplifier meets the Pcs requirements in Table D.1. The signal strength sent by the 27.095MHz energy signal transmitting antenna is detected by a power meter. The uplink signal sent by the transponder is received by the first uplink signal receiving antenna in the test antenna, and the power of the received uplink signal is detected by the spectrum analyzer to obtain the uplink signal transmission strength of the transponder. The loop current generated by the transponder uplink signal is calculated according to the formula. The computer compares and judges the test loop current with the upper and lower limits of the loop current specified in the standard, and outputs the corresponding test data results and image results.

[0060] To test the electrical characteristics of the transponder uplink signal, computer software controls a signal generator to output a downlink energy signal. This energy signal has a frequency of 27.095 MHz and an amplitude that meets the magnetic flux levels specified in Tables D.2 and D.9 of the "TB / T 3544-2018 Transponder Transmission System Test Specification." This means that the signal output from the signal generator, after passing through the RF power amplifier and transmitted by the 27.095 MHz energy signal transmitting antenna, meets the magnetic flux requirements in Tables D.2 and D.9. Passive transponders are tested according to Table D.2, while active transponders are tested according to Table D.9. The uplink signal transmitted by the transponder is received by the second uplink signal receiving antenna in the test antenna. An oscilloscope performs analog-to-digital conversion, digitizes the uplink signal, and transmits it to a computer. The computer calculates the test results for each electrical characteristic indicator based on a pre-defined algorithm and verifies that the selected message transmitted by the transponder is the specified message specified in the test requirements. The computer compares the test results with the upper and lower limits of the indicators specified in the standard, and outputs the corresponding test data results and image results.

[0061] To measure the active transponder control interface characteristics, the computer controls the C-interface test signal generator according to pre-set commands to output the various signal combinations specified in Tables D.18, D.20, and D.21 of the "TB / T 3544-2018 Transponder Transmission System Test Specification." The transponder uplink signal electrical characteristics are then tested under each signal combination.

[0062] like Figure 3 As shown in the figure, the transponder energy receiving antenna resonance point test process:

[0063] Step 1: Place the transponder to be tested in the test position 220mm from the electrical center directly above the test antenna. Place the transponder reader / writer tool above the transponder to be tested, aligning the electrical centers. Use a computer to control the transponder reader / writer tool to write the message corresponding to number 18 in Table B.4 of the "TB / T 3544-2018 Transponder Transmission System Test Specification" into the transponder to be tested. Use the transponder reader / writer tool to read back the message for verification. After completion, move the transponder reader / writer tool away from the radiation range of the test antenna, outside the radius of 1m of the test antenna.

[0064] Step 2: The computer controls the signal generator to sweep the frequency within the range of 27.095 MHz ± 1 MHz. The signal output by the signal generator is amplified by the radio frequency power method and then transmitted to the transponder under test through the 27.095 MHz energy signal transmitting antenna in the test antenna.

[0065] Step 3: The computer reads P through the power meter CS The signal strength of the 27.095MHz energy signal transmitting antenna is detected, and the output amplitude of the signal transmitter is calibrated so that the signal strength of the 27.095MHz energy signal transmitting antenna in the test antenna is Φ within the frequency range of 27.095MHz±1MHz. d1 -2dB, magnetic flux Φ and power meter reading P CS The conversion method can be found in Section D.3.3.2 of "TB / T 3544-2018 Transponder Transmission System Test Specification". The specific formula is as follows:

[0066] ;

[0067] Step 4: The computer reads the uplink signal power received by the spectrum analyzer to obtain the uplink signal transmission strength of the transponder. According to the signal strength change trend, the signal generator frequency and amplitude are adjusted until the magnetic flux of the signal strength transmitted by the test antenna is locked at 27.095MHz energy signal transmission antenna. d1 Under the condition of -2dB, the signal transmitter frequency value with the maximum uplink signal transmission strength of the transponder is the resonance point of the transponder energy receiving antenna.

[0068] like Figure 4 As shown, the IO characteristic test process:

[0069] Step 1: Place the transponder to be tested in the test position 220mm from the electrical center directly above the test antenna. Place the transponder reader / writer tool above the transponder to be tested, aligning the electrical centers. Use a computer to control the transponder reader / writer tool to write the message corresponding to Type 1 in Table B.4 of the "TB / T 3544-2018 Transponder Transmission System Test Specification" into the transponder to be tested. Use the transponder reader / writer tool to read back the message for verification. After completion, move the transponder reader / writer tool away from the radiation range of the test antenna, outside the radius of 1m of the test antenna.

[0070] Step 2: The computer controls the signal generator to output a frequency of 27.095 MHz. The signal output by the signal generator is amplified by the radio frequency power method and then transmitted to the transponder under test through the 27.095 MHz energy signal transmitting antenna in the test antenna.

[0071] Step 3: The computer reads P through the power meter CS The signal strength of the 27.095MHz energy signal transmitting antenna is detected, and the output amplitude of the signal transmitter is calibrated so that the signal strength of the 27.095MHz energy signal transmitting antenna in the test antenna is consistent with the P specified in Table D.1 of the "TB / T 3544-2018 Transponder Transmission System Test Specification" cs The corresponding offset value.

[0072] Step 4: The computer detects the received uplink signal power P by reading the spectrum analyzer. 42 , calculate each P cs The uplink signal loop current corresponding to the offset value is I loop , conversion formula:

[0073] .

[0074] like Figure 5 As shown in the figure, the uplink signal characteristic test process:

[0075] Step 1: Place the transponder to be tested in the test position 220mm from the electrical center directly above the test antenna. Place the transponder reader / writer tool above the transponder to be tested, aligning the electrical centers. Use a computer to control the transponder reader / writer tool to write the message corresponding to Type 1 in Table B.4 of the "TB / T 3544-2018 Transponder Transmission System Test Specification" into the transponder to be tested. Use the transponder reader / writer tool to read back the message for verification. After completion, move the transponder reader / writer tool away from the radiation range of the test antenna, outside the radius of 1m of the test antenna.

[0076] Step 2: The computer controls the signal generator to output a frequency of 27.095 MHz and adjusts the output amplitude of the signal generator. For the sidelobe post-test or the start-up zone test, the signal generator needs to be controlled to modulate the output signal. The signal output by the signal generator is amplified by the RF power method and then transmitted to the transponder under test through the 27.095 MHz energy signal transmitting antenna in the test antenna.

[0077] Step 3: The computer reads P through the power meter CS Detect the signal strength transmitted by the 27.095 MHz energy signal transmitting antenna and calibrate the output amplitude of the signal transmitter. The amplitude must meet the magnetic flux levels specified in Table D.2 and Table D.9 of the "TB / T 3544-2018 Transponder Transmission System Test Specification". Passive transponders must comply with Table D.2, while active transponders must comply with Table D.9.

[0078] Step 4: The computer controls the triggering of the oscilloscope to collect the transponder uplink signal received by the second uplink signal receiving antenna, obtain valid data, and analyze the uplink signal characteristics, namely, the center frequency, frequency offset, amplitude jitter, average data rate, and MTIE (MTIE1 or MTIE2) of the uplink signal.

[0079] like Figure 6 As shown in the figure, the active transponder control interface characteristic measurement process is as follows:

[0080] Step 1: Place the active transponder to be tested at the test position 220mm from the electrical center directly above the test antenna. Place the transponder reader / writer tool above the active transponder to be tested, aligning the electrical centers. Use a computer to control the transponder reader / writer tool to write a message from type 1 to 5 in Table B.4 of the "TB / T 3544-2018 Transponder Transmission System Test Specification" into the transponder to be tested. Use the transponder reader / writer tool to read back and verify. After completion, move the transponder reader / writer tool away from the radiation range of the test antenna, outside the radius of the test antenna of 1m.

[0081] Step 2: Connect the C-interface of the active transponder to be tested to the C-interface test signal generator; the computer controls the C-interface test signal generator to send a specific signal, which is consistent with Tables D.15, D.16, D.17, D.18, and D.23 in the "TB / T 3544-2018 Transponder Transmission System Test Specification";

[0082] Step 3: The computer controls the signal generator to output a frequency of 27.095 MHz and adjusts the output amplitude of the signal generator. The signal output by the signal generator is amplified by the radio frequency power method and then transmitted to the transponder under test through the 27.095 MHz energy signal transmitting antenna in the test antenna.

[0083] Step 4: The computer reads P through the power meter CS Detect the signal strength sent by the 27.095 MHz energy signal transmitting antenna and calibrate the output amplitude of the signal transmitter to ensure that the amplitude meets the magnetic flux level specified in Table D.9 of the "TB / T 3544-2018 Transponder Transmission System Test Specification";

[0084] Step 5: The computer controls the triggering of the oscilloscope to collect the transponder uplink signal received by the second uplink signal receiving antenna, obtain valid data, and analyze the uplink signal characteristics, namely, the center frequency, frequency offset, amplitude jitter, average data rate, and MTIE (MTIE1 or MTIE2) of the uplink signal.

[0085] like Figure 7 As shown, the overall structure of the test antenna is as follows:

[0086] 27.095MHz energy signal transmitting antenna 20: transmits the 27.095MHz signal amplified by the RF power amplifier to the transponder to activate the transponder.

[0087] The first uplink signal receiving antenna 22 receives uplink signals from the transponder for performing IO testing.

[0088] The second uplink signal receiving antenna 21 receives the uplink signal from the transponder for testing the electrical characteristics of the uplink signal, eliminating the commonly used preamplifier.

[0089] like Figure 8 As shown, the structures of the 27.095MHz energy signal transmitting antenna 20 and the first uplink signal receiving antenna 22 are as follows:

[0090] The 27.095 MHz energy signal transmitting antenna 20 comprises: a 27.095 MHz loop made of solid copper with a cross section of 10 mm*20 mm and a corner inner radius of 10 mm, and a tuning capacitor C.

[0091] The 27.095MHz transformer 223 has a primary winding of 6 turns and a secondary winding of 1 turn of the loop itself. The inner diameter of the magnetic ring is about 25mm and the cross-section is a ring structure of 10mm*20mm.

[0092] The current detection transformer 224 has a primary winding of 8 turns and a secondary winding of 1 turn. The primary winding wire passes through the current probe and is short-circuited. The inner diameter of the magnetic ring is about 25 mm and the cross-section is 10 mm*20 mm.

[0093] The first uplink signal receiving antenna 22 comprises a 4.23 MHz loop 221 made of solid brass with a cross-sectional diameter of 2 mm and an inner radius of a bend of 5 mm.

[0094] The 4.23MHz transformer 225 has 7 turns of primary winding and 1 turn of the secondary winding itself. The outer diameter of the magnetic ring is about 15mm.

[0095] The 27.095 MHz transformer 223 is connected to a balun 24 via a coaxial cable 25 and then to the output of the RF power amplifier 31 for receiving RF power signals and radiating RF energy outward through a 27 MHz loop to activate the transponder.

[0096] After the current detection transformer 224 is connected to the current probe 23, it is connected to another balun 24 through a coaxial cable 25, and then connected to a power meter through the power meter terminal 32 to determine the currently transmitted 27.095MHz RF energy and calibrate the magnetic flux size.

[0097] After being connected to the third balun 24 via the coaxial cable 25 , the 4.23 MHz transformer 225 is connected to a spectrum analyzer via the spectrum analyzer terminal 33 for detecting the uplink signal loop current.

[0098] The second uplink signal receiving antenna 21 is connected to the fourth balun 24 via a coaxial cable 25 , and the oscilloscope terminal 34 of the fourth balun 24 is connected to an oscilloscope.

[0099] The coaxial cables 25 are four independent cables.

[0100] like Figure 9 As shown, the structure of the second uplink signal receiving antenna 21 is:

[0101] 4.23MHz modified receiving ring 211: Made of solid brass with a cross-sectional diameter of 2mm and a corner inner radius of 5mm, the size is 100mm*100mm.

[0102] 4.23MHz transformer 212: The transformer has 7 turns on the primary winding and 1 turn on the secondary winding of the loop itself. The outer diameter of the magnetic ring is about 15mm.

[0103] The second uplink signal receiving antenna 21 can receive a sufficiently large uplink signal and directly connect it to the oscilloscope. A preamplifier is no longer needed, and the low-pass filter is eliminated. The effective signal is extracted through filtering by the host computer software algorithm for uplink signal characteristic testing.

[0104] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A transponder automatic testing system, characterized in that: include: A signal generator, used to generate a downlink energy signal for activating the transponder; A radio frequency power amplifier, used to amplify the signal output by the signal generator; a test antenna, comprising a 27.095 MHz energy signal transmitting antenna, a first uplink signal receiving antenna, and a second uplink signal receiving antenna, for transmitting an activation signal and receiving an uplink signal from the transponder; a power meter, configured to monitor the signal power transmitted by the 27.095 MHz energy signal transmitting antenna; A low-pass filter is used to filter out the 27.095 MHz energy signal in the uplink signal; Spectrum analyzer, used to measure the power of uplink signals; Oscilloscope, used to collect electrical characteristics of uplink signals; Transponder reading and writing tools, used to modify and verify transponder messages; C-interface test signal generator, used to generate C-interface signals required for active transponder testing; Computer, used to control the above-mentioned test equipment and process test data;.

2. The automatic transponder testing system according to claim 1, characterized in that: The computer controls the frequency and amplitude output by the signal generator and reads the reading of the power meter to keep the output power consistent within the frequency band of 27.095MHz±1MHz, and determines the resonance point of the transponder by reading the uplink signal power detected by the spectrum analyzer.

3. The automatic transponder testing system according to claim 2, wherein: The computer determines the resonance point by controlling the frequency of the signal generator to sweep within the range of 27.095 MHz ± 1 MHz, and adjusts the signal amplitude so that the radio frequency energy sent by the test antenna is Φ d1 -2dB, the frequency point corresponding to the maximum value of the uplink signal power is detected by a spectrum analyzer, which is the resonance point of the transponder, Φ d1 It is the reference magnetic flux value in transponder testing.

4. The automatic transponder testing system according to claim 1, wherein: The computer directly collects the uplink signal by controlling the oscilloscope, extracts valid data by using a filtering algorithm, and analyzes the center frequency, frequency offset, amplitude jitter, average data rate and MTIE (MTIE1 or MTIE2) of the uplink signal.

5. A transponder automatic testing method using the transponder automatic testing system according to claim 1, comprising the following steps: Step 1: Use a computer to control the signal generator to output a 27.095MHz signal, which is amplified by the RF power amplifier and then sent to the transponder through the test antenna; Step 2: Monitor the power of the transmitted signal using a power meter and adjust the signal generator output to meet the test requirements. Step 3: Receive the uplink signal of the transponder through the test antenna, filter out the interference signal through a low-pass filter, and then analyze the signal with a spectrum analyzer or oscilloscope; Step 4: The computer calculates the test results according to the preset algorithm, compares them with the standard values, and generates a test report.

6. The transponder automatic testing method according to claim 5, characterized in that: The transponder automatic testing method further comprises: Generate specific signals through computer-controlled C-interface test signal generator for testing control interface characteristics of active transponders; Modify and verify the transponder message through the transponder reading and writing tool.

7. A method for testing the resonance point of a transponder energy receiving antenna, using the transponder automatic testing system according to claim 1, comprising the following steps: Step 1: Place the transponder to be tested above the test antenna and write the preset message using the transponder reading and writing tool; Step 2: The computer controls the signal generator to sweep the frequency within the range of 27.095MHz±1MHz, and adjusts the signal amplitude so that the RF energy sent by the test antenna is Φ d1 -2dB; Step 3: Monitor the signal strength using a power meter and the uplink signal power using a spectrum analyzer. Step 4: Determine the frequency corresponding to the maximum uplink signal power as the resonance point of the transponder.

8. A method for testing transponder uplink signal characteristics, using the transponder automatic testing system of claim 1, comprising the following steps: Step 1: Place the transponder to be tested above the test antenna and write the preset message using the transponder reading and writing tool; Step 2: The computer controls the signal generator to output a 27.095 MHz signal and adjusts the amplitude to conform to the magnetic flux level specified in TB / T 3544-2018. Step 3: Use an oscilloscope to acquire the uplink signal and analyze the center frequency, frequency offset, amplitude jitter, average data rate, and MTIE.

9. A method for testing the control interface characteristics of an active transponder, using the transponder automatic test system of claim 1, comprising the following steps: Step 1: Connect the active transponder to be tested to the C-interface test signal generator and write the preset message; Step 2: The computer controls the C-interface test signal generator to output a specific signal that complies with the requirements of TB∕T 3544-2018; Step 3: Perform uplink signal characteristic test to analyze whether the signal parameters meet the standards.

10. A computer-readable storage medium, characterized in that: A computer program is stored, and when the computer program is executed by a processor, the testing method according to any one of claims 5 to 9 is implemented.

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