CN102445584A - System and method for testing working voltage of electronic tag - Google Patents

Abstract

The invention discloses a system and method for testing working voltage of an electronic tag. According to the invention, the speed of a tangential direction of a turntable is utilized to simulate the speed of high-speed linear motion of the RFID (radio frequency identification device) electronic tag in practical application, so that an application scenario of the RFID with the electronic tag being in a high-speed motion state can be effectively simulated in a laboratory; and due to the system, the test space is saved, and the size of test equipment is reduced. Meanwhile, according to the invention, the minimal working voltage of an electronic tag product at different motion speed and different working frequency can be scientifically and repetitively analyzed, so that the influence of motion speed on the different electronic tag products can be obtained.

Description

System and method for testing electronic tag working voltage

technical field

The invention relates to the technical field of radio frequency identification in the electronics industry, in particular to a system and method for testing the working voltage of an electronic tag.

Background technique

The full name of RFID is radio frequency identification (Radio Frequency Identification), which is a non-contact automatic identification technology realized by radio frequency technology. Electronic tags have the characteristics of small size, fast read and write speed, various shapes, long service life, reusable, large storage capacity, and can penetrate non-conductive materials. Combining with RFID readers can realize multi-target identification and mobile target identification , Further, through the combination with Internet technology, it can also realize the tracking of items and the sharing of information on a global scale. RFID technology is used in logistics, manufacturing, public information services and other industries, which can greatly improve management and operation efficiency and reduce costs.

As the core technology of the Internet of Things, with the further promotion of the Internet of Things, RFID technology has developed rapidly, and the number of manufacturers of related products has gradually increased. From handheld to fixed, the variety of RFID readers and tags has also risen to hundreds. And are constantly launching new products. In order to choose the product that can best meet the needs of users among the many RFID readers and tags, it is necessary to conduct special tests on the performance indicators of RFID products. The minimum working voltage of electronic tags is one of the important performance indicators of electronic tag products.

The minimum working voltage of the electronic tag is the minimum voltage required by the reader to drive the electronic tag chip to work normally in a standard test environment without obstacles. This performance index is mainly affected by the design of the electronic tag antenna and the power consumption of the chip. At present, there is still a lack of a quantitative analysis method and equipment to test the specific impact on the minimum operating voltage of the electronic tag under the state of motion, especially when the motion speed is fast.

Contents of the invention

(1) Technical problems to be solved

In order to solve one or more of the above problems, the present invention provides a system and method for testing the working voltage of electronic tags, so as to conduct simple, clear and effective automatic testing of the working voltage of electronic tags in a moving state.

(2) Technical solutions

According to one aspect of the present invention, a test system for the working voltage of an electronic tag is provided. The system includes: turntable, protective cover, driving motor, driving motor controller, support table, signal source, signal source transmitting antenna, signal source transmitting antenna bracket, spectrum analyzer receiving antenna and spectrum analyzer, among which: the electronic label to be tested Set on the edge of the turntable; the turntable is attached to the rotation plane of the drive motor; the protective cover is placed outside the turntable and the electronic label to be tested, and there is a rectangular opening in the middle of the upper part of the protective cover; the protective cover and the drive motor are placed on the support table; The signal source transmitting antenna is placed on the signal source transmitting antenna bracket; the spectrum analyzer receiving antenna is placed on the protective cover, and the spectrum analyzer receiving antenna and the rectangular opening are located at the center of the main lobe axis of the signal source transmitting antenna and the built-in antenna of the electronic tag to be tested on the connecting line of the center of the main lobe axis.

Preferably, the electronic tag operating voltage testing system of the present invention also includes: a control computer, the control computer is respectively connected to the signal source, the spectrum analyzer and the drive motor controller through the data line, and the signal source transmitting antenna is connected to the signal source and the spectrum analyzer receiving antenna It is connected with the spectrum analyzer through the RF feeder; the drive motor controller is connected with the drive motor; the control computer sends the speed control command to the drive motor controller, so that the drive motor drives the turntable to rotate at the speed, so that the electronic label to be tested rotates accordingly ; The control computer sends control instructions to the signal source, so that the reader-writer with controllable output power and frequency of the signal source transmitting antenna reads the electronic tag signal; the spectrum analyzer monitors the signal source transmitting antenna and the electronic tag to be tested through the receiving antenna of the spectrum analyzer. communication process.

Preferably, in the electronic tag operating voltage testing system of the present invention, the drive motor controller, control computer, signal source, and spectrum analyzer are placed outside the full anechoic chamber; the signal source transmitting antenna, the signal source transmitting antenna bracket, and the spectrum analyzer receiving Antennas, protective covers, turntables, electronic tags to be tested, support tables, and drive motors are placed inside the anechoic chamber.

Preferably, in the electronic tag operating voltage testing system of the present invention, the signal source transmitting antenna bracket and the turntable are made of materials with a dielectric constant less than 1.5; the edge of the turntable has firmware for installing the electronic tag, and the material of the firmware is consistent with the material of the turntable .

Preferably, in the electronic tag operating voltage test system of the present invention, the spectrum analyzer receiving antenna is a double dipole antenna with a gain of 2dBi and 2dBi; the signal source transmitting antenna is a standard gain antenna with a gain of 10dBi and 10dBi. Within the bandwidth range, the gain of the transmitting antenna of the signal source remains constant.

Preferably, in the electronic tag operating voltage testing system of the present invention, the signal source is an instrument capable of outputting the RFID reader-writer to read the electronic tag signal at a preset frequency and preset power, and the preset frequency and preset power are remotely controlled by the control computer Adjustment.

Preferably, in the electronic tag operating voltage testing system of the present invention, the protective cover is made of a steel plate with a wave-absorbing material pasted on the outside; the casing of the driving motor is made of metal material, and a layer of wave-absorbing material is pasted on the outside of the casing.

According to another aspect of the present invention, a method for testing the working voltage of an electronic tag by using the above system is also provided. The method includes: Step A: the control computer sends instructions to the drive motor controller, so that the electronic label moves with the turntable at a set speed V, V=2πRn/60, R is the distance from the position of the label to the center of the turntable, and n is the drive The speed of the motor per minute, set the number of initial communications; Step B: Set the transmission power of the signal source through the control computer, and the analog reader-writer transmitted by the signal source reads the signal frequency of the electronic tag; Step C: The spectrum analyzer captures the transmission of the signal source The electromagnetic signal of the communication process between the antenna and the electronic tag to be tested, demodulate the read tag signal and the tag signal in the captured electromagnetic signal, and add 1 to the number of communication; Step D: Whether the number of communication is less than the preset threshold, if yes, execute the step E, otherwise, execute step H; step E: judge whether the electronic tag signal is correctly demodulated, if yes, execute step F, otherwise, execute step G; step F, the spectrum analyzer sends the demodulated read tag signal and tag The signal is recorded at the control computer, and the transmission power of the signal source is lowered. If the transmission power of the signal source is not zero at this time, perform step G; step G, re-execute step C; step H, use the voltage of the control computer at this time as the electronic label working voltage.

Preferably, in the method for testing the working voltage of the electronic tag of the present invention, step F further includes: step I, if the transmitting power of the signal source is zero at this time; and the recorded working frequency of the signal source changes, then re-execute step B.

Preferably, in the method for testing the working voltage of the electronic tag of the present invention, step I further includes: step J, if the transmitted power of the signal source is zero; and the recorded operating frequency of the signal source has not changed; and the movement speed of the electronic tag to be tested changes , then perform step A again.

Preferably, in the method for testing the working voltage of the electronic tag of the present invention, before step A, it also includes: step A', respectively establishing communication connections between the control computer and the signal source, the drive motor controller, and the spectrum analyzer, so that the signal source and the drive The motor controller enters the work preparation state, and the spectrum analyzer enters the frequency domain template trigger mode preparation state of the spectrum analyzer.

(3) Beneficial effects

The system and method for testing the working voltage of electronic tags in the present invention have the following beneficial effects:

(1) The present invention utilizes the speed in the tangential direction of the turntable to simulate the high-speed linear motion speed of the RFID electronic tag in practical applications, which can effectively simulate the RFID application scene where the electronic tag is in a high-speed motion state in the laboratory, and the system saves the test space and reduces the Small test equipment volume;

(2) The present invention can scientifically and repeatably analyze the minimum operating voltage of electronic label products at different moving speeds and different working frequencies, and obtain the influence of moving speed on different electronic label products.

Description of drawings

Fig. 1 is a schematic structural view of an electronic tag working voltage testing system according to an embodiment of the present invention;

Fig. 2 is a flowchart of a method for testing the working voltage of an electronic tag according to an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. While illustrations of parameters including particular values may be provided herein, it should be understood that parameters need not be exactly equal to the corresponding values, but rather may approximate the values within acceptable error margins or design constraints.

In an exemplary embodiment of the present invention, a system for testing the working voltage of an electronic tag is provided. FIG. 1 is a schematic structural diagram of an electronic tag working voltage testing system according to an embodiment of the present invention. As shown in Figure 1, the system includes: standard test environment 1, signal source transmitting antenna 2, signal source transmitting antenna bracket 3, spectrum analyzer receiving antenna 4, protective cover 5, turntable 6, electronic label to be tested 7, support platform 8. Drive motor 9, drive motor controller 10, control computer 11, signal source 12, spectrum analyzer 13.

As shown in Figure 1, the signal source transmitting antenna 2, the signal source transmitting antenna bracket 3, the spectrum analyzer receiving antenna 4, the protective cover 5, the turntable 6, the electronic label to be tested 7, the supporting platform 8, and the driving motor 9 are placed in the standard test Inside the environment 1, the drive motor controller 10, the control computer 11, the signal source 12, and the spectrum analyzer 13 are placed outside the standard test environment 1, and the signal source transmitting antenna 2 is placed on the signal source transmitting antenna support 3, and the spectrum analyzer The receiving antenna 4 is placed on the protective cover 5, the electronic tag 7 to be tested is installed on the turntable 6 through the label slot, the receiving antenna 4 of the spectrum analyzer is placed in the center of the main lobe axis of the signal source transmitting antenna 2 and the electronic tag 7 to be tested is built in The connecting line of the center of the main lobe axis of the antenna. The turntable 6 is fixed on the drive motor 9 , the protective cover 5 is set on the outside of the turntable 6 and the electronic label 7 to be tested, and the protective cover 5 and the drive motor 9 are placed on the supporting platform 8 . The signal source transmitting antenna bracket and turntable are made of materials with low conductivity and a dielectric constant less than 1.5.

The signal source transmitting antenna 2 is connected to the signal source 12, the spectrum analyzer receiving antenna 4 and the spectrum analyzer 13 respectively through a radio frequency feeder, and the control computer 11 is connected to the signal source 12, the spectrum analyzer 13 and the drive motor controller 10 through data lines. connected separately.

During the test, the control computer 11 sends a speed control command to the drive motor controller 10 to make the electronic tag 7 to be tested move at a set speed; the control computer 11 sends a control command to the signal source 12 to make the signal source transmit antenna 2 output power Read the electronic tag signal with a frequency-controllable reader-writer; the spectrum analyzer 13 monitors the communication process between the signal source transmitting antenna 2 and the electronic tag 7 to be tested through the spectrum analyzer receiving antenna 4, and captures the electromagnetic signal corresponding to the communication process, Demodulate the read tag signal and tag signal in the captured electromagnetic signal; if the correctly demodulated electronic tag signal is found, the demodulated read tag signal and tag signal are sent to the control computer 11 for recording, and the control computer 11 sends the control again. Instructions are sent to the signal source 12, and the transmission power of the signal source 12 is reduced by one adjustment unit, and continue to capture the electromagnetic signal in the communication process until the tag signal cannot be demodulated correctly, and the next test starts after adjusting the transmission power and frequency after statistics. If the label movement speed has been adjusted, set the movement speed on the control computer 11 to start the next test.

In one embodiment of the present invention, the standard test environment 1 is set up in a long 6 meters, wide 3 meters, high 3 meters in a fully anechoic chamber, signal source 12, spectrum analyzer 13, control computer 11, drive motor controller 10 are placed Located outside the anechoic chamber, the RF interface and power interface of these instruments are connected to the equipment in the anechoic chamber through the fiber optic waveguide located on the wall of the anechoic chamber, so that the electromagnetic radiation emitted by the equipment interface outside the anechoic chamber will not affect the equipment in the anechoic chamber. The electromagnetic environment causes changes.

The signal source transmitting antenna bracket 3 is 2 meters high, made of polystyrene material, wrapped with absorbing material, and the standard gain antenna with a fixed gain of 10dBi above the bracket is used as the signal source transmitting antenna 2, and the signal source transmitting antenna 2 is placed on each The antenna gain indicators of the frequency points are the same. A double dipole antenna with a fixed gain of 2.3dBi is used as the receiving antenna 4 of the spectrum analyzer, and the distance between the receiving antenna 4 of the spectrum analyzer and the transmitting antenna 2 of the signal source is 0.7 meters. The signal source 12 selects a vector signal generator capable of outputting a signal of an electronic tag read by an analog RFID reader at a preset frequency and preset power, the frequency range of which is 0-3GHz, the minimum step frequency is 1Hz, and the minimum step power is 0.02 dBm; the spectrum analyzer receiving antenna 4 is close to the label reading window, and the spectrum analyzer 13 selects a real-time spectrum analyzer that can trigger in the frequency domain and display the instantaneous waveform of the wireless signal, and the control computer 11 selects a PC with a LAN interface, and real-time The spectrum analyzer 13 and the signal source 12 are connected through a 1000Mbps Ethernet switch, and the data exchange is completed using the TCP/IP protocol transmission mode based on the VXI bus. The driving motor 9 adopts an AC servo system, and the speed accuracy is one thousandth of the rotation speed, the highest The rotating speed is 2000 rpm, and the shell of the driving motor 9 is wrapped with a wave-absorbing material.

As shown in FIG. 2 , FIG. 2 is a flowchart of a method for testing the working voltage of an electronic tag according to an embodiment of the present invention. As shown in Figure 2, this embodiment includes the following steps:

Step S202: equipment initialization, set up the communication connection between control computer 11 and signal source 12, drive motor controller 10, spectrum analyzer 13 respectively, set the parameters of signal source 12 and spectrum analyzer 13, make signal source 12 and the drive motor controller 10 enter the work preparation state, and the spectrum analyzer 13 enters the frequency domain template trigger mode preparation state of the spectrum analyzer, and the capture communication times is 0;

Among them, the communication connections between the control computer and the signal source, drive motor controller, and spectrum analyzer are respectively established through Ethernet, serial port or GPIB bus, so that the control computer can send and receive signals from the signal source, drive motor control control instructions and query results of the analyzer and spectrum analyzer. Setting the frequency domain template trigger of the spectrum analyzer on the control computer side is to trigger the corresponding equipment operation command when a signal that meets the set frequency and power conditions appears in the frequency domain within a very short sampling time period.

Step S204: Set the range of the moving speed of the tag 7 to be tested on the control computer 11 to [10km/h, 160km/h], the moving speed of the electronic tag 7 to be tested is V=100km/h, and the control computer 11 drives the motor controller 10 Send an instruction to make the electronic label 7 to be tested move with the turntable 6 at a set speed V=100km/h, V=2πRn/60, R is the distance from the position of the label to the center of the turntable, and n is the speed of the drive motor per minute , where the driving motor adopts an AC servo system, the speed accuracy is one thousandth of the speed, and the maximum speed is 2000 rpm;

Step S206: Set the transmission power of the signal source 12 through the control computer 11 as _PSG = 20dBm, and the signal frequency of the analog reader-writer transmitted by the signal source 12 to read the electronic tag is _fc = 920MHz, and its range is 840～845MHz and 920～ 925MHz, open the signal source 12 launch port;

Step S208: The spectrum analyzer 13 captures the electromagnetic signal of the communication process between the signal source transmitting antenna 2 and the electronic tag 7 to be tested, demodulates the tag reading signal and the tag signal in the captured electromagnetic signal, and adds 1 to the number of capture communications;

Step S210: Judging whether the number of capture communications is less than 100, if it is, go to step S212, otherwise go to step S222;

Step S212: If a correctly demodulated electronic tag signal is found, go to step S214, otherwise go to step S208;

Step S214: Send the demodulated tag reading signal and tag signal to the control computer 11 for recording, and lower the transmission power of the signal source 12, for example, the adjustment unit of the signal source transmission power is 1dBm;

Step S216: If it is found that the transmission power of the signal source 12 has been reduced to 0, go to step S218, otherwise go to step S208;

Step S218: If the transmission frequency of the signal source 12 has changed, go to step S206, otherwise go to step S220;

Step S220: If the movement speed of the electronic tag 7 to be tested has changed, then go to step S204, otherwise go to step S222;

Step S222: the control computer 11 statistically analyzes the recorded data, uses the working voltage at this time as the working voltage of the electronic tag, disconnects the communication connection between the control computer 11 and the signal source 12, the drive motor controller 10, and the spectrum analyzer 13, Turn off all test equipment and the test is complete.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. the test macro of an electronic tag WV; It is characterized in that; Comprise: rotating disk, protective cover, drive motor, drive motor controller, brace table, signal source, signal source emitting antenna, signal source emitting antenna support, spectrum analyzer receiving antenna and spectrum analyzer, wherein:

Electronic tag to be measured is arranged at the edge of said rotating disk; Said rotating disk is mounted on the rotational plane of said drive motor; Shielding cover is outside at rotating disk and electronic tag to be measured, and there is a rectangular opening centre directly over the protective cover; Protective cover and drive motor place brace table; The signal source emitting antenna places on the signal source emitting antenna support; The spectrum analyzer receiving antenna places on the protective cover, and spectrum analyzer receiving antenna and said oblong openings all are positioned on the connecting line at main lobe axle center of main lobe axle center and electronic tag built-in aerial to be measured of signal source emitting antenna.

2. electronic tag WV test macro according to claim 1 is characterized in that, also comprises: control computer,

Said control computer links to each other respectively with signal source, spectrum analyzer and drive motor controller through data line, links to each other through radio frequency feed line respectively between signal source emitting antenna and signal source, spectrum analyzer receiving antenna and the spectrum analyzer; The drive motor controller is connected with said drive motor;

Control computer is sent the rotating speed steering order to drive motor controller, make said drive motor drive rotating disk with said rotational speed, thereby said electronic tag to be measured rotates thereupon; Control computer makes the controlled read write line of signal source emitting antenna output power and frequency read the electronic tag signal to the signal source sending controling instruction; Spectrum analyzer is through the communication process of spectrum analyzer receiving antenna monitor signal source emitting antenna and electronic tag to be measured.

3. electronic tag WV test macro according to claim 2 is characterized in that,

Said drive motor controller, control computer, signal source, spectrum analyzer place the outside of fully anechoic chamber;

Said signal source emitting antenna, signal source emitting antenna support, spectrum analyzer receiving antenna, protective cover, rotating disk, electronic tag to be measured, brace table, drive motor place the inside of fully anechoic chamber.

4. electronic tag WV test macro according to claim 1 is characterized in that:

Said signal source emitting antenna support and rotating disk adopt specific inductive capacity to process less than 1.5 material;

There is the firmware that electronic tag is installed at the edge of rotating disk, and the material of this firmware is consistent with the material of said rotating disk.

5. electronic tag WV test macro according to claim 1 is characterized in that:

The spectrum analyzer receiving antenna is that gain is 2dBi and the above double dipole antenna of 2dBi;

Said signal source emitting antenna is that gain is 10dBi and the above standard gain antenna of 10dBi, and in the calibration tape wide region, the gain of signal source emitting antenna remains unchanged.

6. electronic tag WV test macro according to claim 1; It is characterized in that: said signal source is to read the instrument of electronic tag signal with predeterminated frequency and preset power output rfid interrogator, and this predeterminated frequency and preset power are through the long-range adjustment of control computer.

7. the electronic tag WV test macro under the motion state according to claim 1 is characterized in that:

Protective cover is to be processed by the steel plate that absorbing material has been pasted in the outside;

The shell of said drive motor is a metal material, and one deck absorbing material has been pasted in the outside of shell.

8. one kind is utilized the method that each described system carries out the test of electronic tag WV in the claim 1 to 7, it is characterized in that, comprising:

Steps A: control computer is sent instruction to drive motor controller; Electronic tag is moved with rotating disk with setting speed V, V=2 π Rn/60, R must distance to the center of turntable position for the label position; N is the rotating speed of drive motor per minute, sets the initial communication number of times;

Step B: through the emissive power in control computer setting signal source, the simulation read write line of signal source emission is read the electronic tag signal frequency;

Step C: the electromagnetic signal of the communication process of spectrum analyzer lock-on signal source emitting antenna and electronic tag to be measured, label signal and label signal are read in demodulation in the electromagnetic signal that captures, and number of communications adds 1;

Step D: whether number of communications less than predetermined threshold value, if, execution in step E, otherwise, execution in step H;

Step e: judge whether that correct Solution accesses the electronic tag signal, if, execution in step F, otherwise, execution in step H;

Step F, spectrum analyzer are sent and to be read label signal and label signal to control computer end record after the demodulation, turn down the signal source emissive power;

Step G judges this moment, whether the signal source emissive power was zero, if non-vanishing, execution in step C;

Step H is with the WV of said control computer voltage at this moment as said electronic tag.

9. electronic tag Working voltage testing method according to claim 8 is characterized in that, said step G also comprises:

If this moment, the signal source emissive power was zero, judge then whether the signal source frequency of operation of record changes, if the signal source frequency of operation of record changes, execution in step B again then.

10. electronic tag Working voltage testing method according to claim 9 is characterized in that, said step G also comprises:

If this moment, the signal source emissive power was zero, and the signal source frequency of operation of record does not change; Whether the movement velocity of then judging electronic tag to be measured changes, if when the movement velocity of electronic tag to be measured changes, and execution in step A again then; Otherwise flow process finishes.

11. each described electronic tag Working voltage testing method in 10 is characterized in that according to Claim 8, also comprises before the said steps A:

Steps A '; Setting up control computer respectively is connected with communication between signal source, drive motor controller, the spectrum analyzer; Make signal source and drive motor controller get into readiness for operation, spectrum analyzer gets into the frequency domain template trigger mode SBR of spectrum analyzer.

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