Calibration Method for Anti-Jamming Test Equipment of Wireless Transmission Signals

Abstract

The present invention relates to a calibration method for a wireless transmission signal anti-interference test device, which is used for calibrating the test device and test operations. The test device has an interference transmitting antenna, a monitoring antenna and a position antenna. The method includes the calibration of a signal generator; the calibration of the gain error of radio frequency components; the correction of the position antenna. When in use, the operating parameters of the signal generator and the operating gain correction data file are loaded into the test device for calling during testing. Due to the individual differences existing in the mass production of the device, however, the calibration data or file formed by the calibration method of the present invention can ensure the consistency of the signal source in the test device, effectively eliminate the influence brought by the errors of the device itself, improve the accuracy of the test results, improve the consistency of the test process and results, improve the reliability of the test results, and is suitable for the requirements of rapid batch testing and consistency in current anti-interference test devices such as Bluetooth headsets.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless signal testing, and particularly to a calibration method for a wireless transmission signal anti-interference testing device. Background Art

[0002] When mass-producing wireless transmission anti-interference devices, for example, when mass-producing the testing devices involved in the invention patent application named "Wireless Transmission Signal Anti-Interference Testing Device and Method" and the utility model patent application named "Wireless Transmission Signal Anti-Interference Testing Device" submitted by the applicant, various errors exist in each component, including, for example, signal generators, attenuators, amplifiers, filters, antennas, and shielding boxes. There are more or less errors in the devices mass-produced in different batches. Therefore, it is necessary to eliminate the errors of each component according to the measured values of the above components of the testing device, so as to ensure that the test results of each set of devices are consistent. Summary of the Invention

[0003] In view of this, a calibration method for a wireless transmission signal anti-interference testing device is provided, which can effectively reduce the error influence of the testing device itself, effectively eliminate the influence of device errors on the signal source, improve the accuracy of test results, improve the consistency of the test process and results, and improve the reliability of test results.

[0004] A calibration method for a wireless transmission signal anti-interference testing device is used for in-situ calibration of the testing device. The testing device includes an interference transmitting antenna, a monitoring antenna, and a positioning antenna. The method includes the following steps:

[0005] S10, Calibration of the signal generator: Determine the interference spectral density, control the level to make the signal generator generate a fixed-point output frequency signal, synchronously monitor the spectral signal and adjust the fine-tuning control level to move the spectral signal to a predetermined frequency point, record the level data corresponding to each frequency point, and form the operating parameters of the signal generator. The predetermined frequency points include the maximum frequency point value and the minimum frequency point value;

[0006] S20, Calibration of the gain error of the RF components, including the following sub-steps:

[0007] S21, Connect the signal generator according to the actual measurement and assembly, control the level according to the operating parameters of the signal generator obtained in step S10, start from the attenuation value of 0DB, control the waveform frequency to continuously run at the minimum interval frequency point within the predetermined range, synchronously receive the spectrum analyzer data to generate an interference intensity curve corresponding to the attenuation, and then repeat the above steps according to the predetermined DB difference of the attenuation amount to generate continuous and complete attenuation map data;

[0008] S22, Generate a standard interference intensity running diagonal line;

[0009] S23. Calculate the standard interference intensity running diagonal line and the measured attenuation data to obtain the running gain correction data file, and the gain correction is completed.

[0010] S24. The test equipment runs according to the running gain correction data file, and the first interference intensity curve is monitored by the monitoring antenna to be closest to the standard interference intensity running diagonal line to meet the measurement accuracy consistency requirements of different devices.

[0011] S30. Position antenna correction: Replace the position antenna with the monitoring antenna 130 and connect it to the spectrum analyzer. Control the calibration equipment to run according to the parameters of the running gain correction data file to obtain the second interference intensity curve corresponding to the position antenna, make the second interference intensity curve closest to the standard interference intensity running diagonal line, adjust the position of the position antenna so that the second interference intensity curve measured by the position antenna coincides with the first interference intensity curve measured by the monitoring antenna, determine the position of the position antenna, and the position antenna correction is completed.

[0012] After the above three-step correction is completed, further load the operating parameters of the signal generator and the running gain correction data file into the wireless transmission signal anti-interference test equipment to be calibrated for use during testing.

[0013] Among them, step S10 specifically includes the following steps:

[0014] S11. Determine the minimum to maximum interference spectral density, and adjust the computer control level to make the signal generator generate a fixed-point output frequency signal.

[0015] S12. Synchronously monitor the spectral signal, finely adjust the control level to move the spectral signal to the 2.4G frequency point, record the level data as the starting value level, repeat the above steps to move the spectral signal to the 2.5G frequency point, record the level data at this time as the ending value level, and store to form the operating parameters of the signal generator.

[0016] S13. Control the signal generator to generate a triangular wave or trapezoidal wave within 2.4G - 2.5G, emit an interference spectral signal, and set the starting waveform level and ending waveform level as the starting value level and ending value level respectively.

[0017] Preferably, in step S20, the attenuation amount is at an interval of -0.25 DB, repeat the above step S21, and continuously run until the attenuation amount reaches -32 DB to obtain continuous and complete attenuation map data.

[0018] Preferably, in step S20, the waveform frequency continuously runs from 0 to 5000 at the minimum interval frequency point, and synchronously receive the spectrum analyzer data to generate the interference intensity curve corresponding to each attenuation value.

[0019] The standard interference intensity running slope in step S22 is a linear slope of the change in spectral density / amplitude of the interference intensity with respect to the change in the frequency of the control waveform, preferably a change slope between 0 and a maximum value of 0.4.

[0020] In step S23, the calculation of the standard interference intensity running slope and the measured attenuation data is carried out as follows: Compare the standard interference intensity running slope with the attenuation diagrams of the measured data curves at different attenuation values, calculate the attenuation amount of each point on the standard interference intensity running slope relative to each measured interference intensity curve, and form a running gain correction data file for use during testing.

[0021] In step S30, the position antenna is in the same position as the product under test and moves synchronously. By moving and adjusting the position and / or angle of the position antenna, the second interference intensity curve measured by the position antenna is made to coincide with the first interference intensity curve measured by the monitoring antenna, thereby determining the position of the position antenna.

[0022] In a preferred embodiment, the relative angle between the interference transmitting antenna and the position antenna is 85 - 95 degrees. The interference transmitting antenna is vertical and located at the width center position of the test device, with a distance of 110 - 130 cm from the position antenna, and the height of the position antenna is 50 - 70 cm.

[0023] The calibration method for the wireless transmission signal anti-interference test device provided by the present invention has at least the following advantages:

[0024] 1. Since there are various errors in each component of the test device during mass production, these errors have a greater impact on the signal and directly affect the test effect of the test device. Through the calibration method of the present invention, the influence of the self-errors of the components in the test device on the interference signal can be effectively eliminated;

[0025] 2. This calibration method can effectively reduce the influence of the errors of the test device itself, effectively eliminate the influence of device errors on the signal source, thereby improving the accuracy of the test results, improving the consistency of the test process and results, improving the reliability of the test results, and ultimately ensuring the consistency of the test results of each set of test devices.

[0026] 3. After the test device is calibrated and used, the reliability of the batch test results is improved, batch testing is realized, and it provides convenience and effective guarantee for accurately evaluating the products under test in mass production, such as headphones. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic flowchart of the calibration method for the wireless transmission signal anti-interference test device of the embodiment of the present invention.

[0028] Figure 2It is a schematic structural diagram of a test device to which the calibration method of a wireless transmission signal anti-interference test device according to an embodiment of the present invention is applied.

[0029] Figure 3 It is a schematic diagram of a triangular wave generated by a signal generator and an interference spectrum emitted in the calibration method of a wireless transmission signal anti-interference test device according to an embodiment of the present invention.

[0030] Figure 4 It is a schematic diagram of an electrical connection structure of a test device to which the calibration method of a wireless transmission signal anti-interference test device according to an embodiment of the present invention is applied.

[0031] Figure 5 It is a schematic structural diagram of a device during calibration in the calibration method of a wireless transmission signal anti-interference test device according to an embodiment of the present invention.

[0032] Figure 6 It is a schematic diagram of interference spectrum curves at each level under interval attenuation at a sweep frequency of 940 HZ in the calibration method of a wireless transmission signal anti-interference test device according to an embodiment of the present invention.

[0033] Figure 7 It is a schematic diagram of an operating oblique line of a standard interference intensity adopted in the calibration method of a wireless transmission signal anti-interference test device according to an embodiment of the present invention. Specific embodiments

[0034] The present invention will be described in detail below in conjunction with specific embodiments and drawings.

[0035] Please combine Figure 2 Refer to Figure 1 , which shows a calibration method for a wireless transmission signal anti-interference test device provided by an embodiment of the present invention, used for in-device calibration of the test device. The test device 100 has an interference transmitting antenna 130, a monitoring antenna 120, and a position antenna 140. The method includes the following steps:

[0036] S10, calibration of the signal generator;

[0037] S20, calibration of the gain error of the radio frequency component;

[0038] S30, correction of the position antenna.

[0039] The embodiment of the present invention further includes step S40, that is, after the above three-step correction is completed, the operating parameters of the signal generator and the operating gain correction data file are further loaded into the wireless transmission signal anti-interference test device to be corrected for use during testing.

[0040] Such as Figure 2As shown in the figure, the test device 100 includes a shielding box 110 for testing the receiving performance of wireless transmission products. In this embodiment, the anti-interference performance of a Bluetooth headset is taken as an example for illustration. The test device 100 is exemplified as a 2.4G - 2.5G (Bluetooth) audio transmission anti-interference test device. Through this test device 100, rapid testing is provided for the mass production of Bluetooth headsets, which not only provides performance guarantee for the mass production of Bluetooth headsets, but also improves product quality and production efficiency. As Figure 4 shown, a pair of Bluetooth headsets 103 are the workpieces to be tested. The mobile phone 102 and the Bluetooth headsets 103 are initially installed on the corresponding fixtures, and the mobile phone 102 and the Bluetooth headsets 103 are connected. The received signal of the Bluetooth headsets 103 is amplified by an audio signal amplifier 56, and then the received signal of the Bluetooth headsets 103 is collected by a signal acquisition device 57 and transmitted to a computer for analysis and processing.

[0041] The following will specifically describe each step separately.

[0042] In step S10, first determine the interference spectrum density, control the level to make the signal generator generate a fixed-point output frequency signal, synchronously monitor the spectrum signal and adjust the fine control level to move the spectrum signal to a predetermined frequency point, record the level data corresponding to each frequency point, and form the operating parameters of the signal generator. The predetermined frequency points include the maximum frequency point value and the minimum frequency point value.

[0043] Step S10 includes the following specific operation process:

[0044] S11, determine the minimum to maximum interference spectrum density, and by adjusting the computer control level, make the signal generator generate a fixed-point output frequency signal. This embodiment is described by taking 2.4G - 2.5G as an example. As Figure 3 shown, since the signal generator uses a triangular wave or trapezoidal wave to generate a high-speed swept frequency signal within 2.4G - 2.5G to emit interference spectrum signals, in this embodiment, the 2.4G frequency point and the 2.5G frequency point are used as the minimum and maximum position values.

[0045] S12, synchronously monitor the spectrum signal, finely adjust the control level to move the spectrum signal to the 2.4G frequency point, record the level data as the starting value level, repeat the above steps to move the spectrum signal to the 2.5G frequency point, record the level data at this time as the ending value level, and store and form the operating parameters of the signal generator;

[0046] S13. The control signal generator generates a triangular wave or a trapezoidal wave within 2.4G - 2.5G, emits an interference spectrum signal, and sets the starting level and the ending level of the waveform to the starting value level and the ending value level respectively. In this way, when called, when the computer emits a triangular wave waveform, the starting level and the ending level are set to the measured values of the starting value level and the ending value level described above, thereby realizing the calibration of the signal generating device.

[0047] Please refer to Figure 4 and 5 , which shows the test equipment 100 and its related components. The radio frequency interference source equipment includes a radio frequency signal generator 61, a radio frequency amplifier 62, a radio frequency filter 63, as well as an attenuator and an antenna, etc. These components all have corresponding errors when transmitting interference signals. The superposition of these errors has a serious impact on the consistency of the interference signal and is the main reason for inaccurate measurement. After the shielding box 110 is assembled, the motors at each adjustment position return to the zero point, and the external devices are connected as shown in the figure, then the gain error calibration of the radio frequency components can be carried out.

[0048] In step S20, the gain error calibration of the radio frequency components includes the following sub - steps:

[0049] S21. Assemble and connect the signal generator according to the actual measurement, control the level according to the signal generator operation parameters obtained in step S10, start from the attenuation value of 0DB, control the waveform frequency to continuously run at the minimum interval frequency points within a predetermined range, synchronously receive the data of the spectrum analyzer to generate an interference intensity curve corresponding to the attenuation, and then repeat the above steps according to a predetermined DB difference to generate continuous and complete attenuation map data.

[0050] The curve obtained in this step S21 is as Figure 6 shown. The attenuation of each curve is at an interval of - 0.25 DB. Repeat the above - mentioned step S21 until the attenuation reaches - 32DB to obtain continuous and complete attenuation map data. Preferably, in step S21, the waveform frequency continuously runs from 0 to 5000 at the minimum interval frequency points, synchronously receives the data of the spectrum analyzer, thereby generating the interference intensity curve corresponding to each attenuation value, which is the Figure 6 shown curve graph.

[0051] S22. Generate a standard interference intensity running diagonal line; the standard interference intensity running diagonal line in this step S22 is the most ideal linear diagonal line of the interference intensity changing with the control waveform frequency for the spectrum density / amplitude change, preferably the diagonal line changing between 0 and the maximum value of 0.4. The inventor found through test practice that the interference intensity is preferably between 0 and the maximum value of 0.4. Usually, about 0.1 is more obvious for most headphones, so 0.4 can effectively interfere with all headphones. The standard interference intensity running diagonal line generated in this embodiment is as Figure 7 shown.

[0052] S23. Calculate the standard interference intensity running diagonal line and the measured attenuation data to obtain the running gain correction data file, and the gain correction is completed. In step S23, the specific operation of calculating the standard interference intensity running diagonal line and the measured attenuation data is as follows: Compare the standard interference intensity running diagonal line with the attenuation diagrams of the measured data curves at different attenuation values, calculate the attenuation amount of each point on the standard interference intensity running diagonal line relative to each measured interference intensity curve, form the running gain correction data file, and call it during testing.

[0053] S24. The test equipment runs according to the running gain correction data file, and the first interference intensity curve is monitored by the monitoring antenna to be closest to the standard interference intensity running diagonal line to meet the measurement accuracy consistency requirements of different devices. Since the attenuation amount is at an interval of -0.25 DB, the accuracy of this embodiment can be controlled to reach 0.25 DB, meeting the measurement accuracy consistency requirements of different devices.

[0054] In step S30, the calibration of the position antenna 140 includes the following operations: Replace the monitoring antenna 130 with the position antenna 140 and connect it to the spectrum analyzer 64. Control the calibration equipment to run according to the parameters of the running gain correction data file to obtain the second interference intensity curve corresponding to the position antenna 140, make the second interference intensity curve closest to the standard interference intensity running diagonal line, adjust the position of the position antenna 140 so that the second interference intensity curve measured by the position antenna 140 coincides with the first interference intensity curve measured by the monitoring antenna 130, determine the position of the position antenna 140, and the calibration of the position antenna 140 is completed.

[0055] In step S30, the position antenna 140 is in the same position as the tested product and moves synchronously. By moving and adjusting the position and / or angle of the position antenna, the second interference intensity curve measured by the position antenna coincides with the first interference intensity curve measured by the monitoring antenna, and the position of the position antenna is determined.

[0056] As shown in the figure, the position of the tested product is placed on the fixture 141, and the position antenna 140 moves synchronously with the fixture 141.

[0057] Such as Figure 2 and 5As shown, the interference transmitting antenna 130 and the monitoring antenna 120 are arranged on a first moving mechanism 150. The first moving mechanism 150 includes a mounting base plate 15, a slide rail 16, and a slider 17. The interference transmitting antenna 130 and the monitoring antenna 120 are mounted on the slider 17 and horizontally move along the first direction under the drive of the slider 17. In other embodiments, the first moving mechanism further includes another sliding structure that drives the slider 17 or the slide rail 16 to horizontally move along the second direction, and the second direction is perpendicular to the first direction. The interference transmitting antenna 130 and the monitoring antenna 120 are arranged parallel to each other on the slider 17, preferably moving synchronously, or can be set to move asynchronously and move independently. In addition, a rotating mechanism can be provided on the slider 17 to adjust the angles of the interference transmitting antenna 130 and the monitoring antenna 120 relative to the position antenna 140. In some preferred embodiments, the horizontal or height positions of the interference transmitting antenna 130 and / or the monitoring antenna 120 are adjusted by moving, and further, the angle of the position antenna 140 is adjusted by rotation, and the angles of the interference transmitting antenna 130 and / or the monitoring antenna 120 are adjusted by rotation, so as to adjust and calibrate the positions of the antennas.

[0058] As Figure 2 and 5 shown, the position antenna 140 and the fixture 141 are both mounted on a second moving mechanism 160. The second moving mechanism 160 is preferably of the same structure as the first moving mechanism 150 and also includes a mounting base plate 45, a slide rail 46, and a slider 47. The workpiece 41 is mounted on the slider 47. The second moving mechanism 160 can also include another sliding mechanism and a rotating mechanism, which will not be elaborated here.

[0059] In a preferred embodiment, the relative angle between the interference transmitting antenna 130 and the position antenna 140 is 85 - 95 degrees. The interference transmitting antenna 130 is vertical and located at the width center position of the test device 100, and the distance from the position antenna 140 is 110 - 130 cm. The relative height of the position antenna 140 is 50 - 70 cm.

[0060] The calibration method of the wireless transmission signal anti-interference test device provided by the present invention has at least the following advantages:

[0061] 1. Since various errors exist in each component during mass production of the test device, these errors have a great impact on the signal and directly affect the test effect of the test device. Through the calibration method of the present invention, the influence of the self-errors of the components in the test device on the interference signal can be effectively eliminated;

[0062] 2. This calibration method can effectively reduce the error influence of the test equipment itself and effectively eliminate the influence of device errors on the signal source, thereby improving the accuracy of test results, improving the consistency of the test process and results, improving the reliability of test results, and ultimately ensuring the consistency of test results for each set of test equipment.

[0063] 3. After the test equipment is calibrated and used, the reliability of batch test results is improved, batch testing is achieved, and it provides convenient and effective guarantee for accurately evaluating the tested products in mass production, such as headphones.

[0064] As mentioned above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent replacements or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A calibration method for wireless transmission signal anti-interference test equipment, used for calibration of the test equipment and test operation, wherein the test equipment has an interference transmission antenna, a monitoring antenna, and a position antenna, and comprises the following steps: S10, signal generator calibration: determine the interference spectrum density, control the level so that the signal generator generates a fixed-point output frequency signal, synchronously monitor the spectrum signal and adjust the fine-tuning control level to move the spectrum signal to the predetermined frequency point, record the level data corresponding to each frequency point, and form the signal generator operating parameters. The predetermined frequency points include the maximum frequency point value and the minimum frequency point value; S20, RF component gain error calibration, includes the following steps: S21: Assemble and connect the signal generator according to the actual measurement. Control the level according to the signal generator operating parameters obtained in step S10. Starting from the attenuation value of 0 dB, control the waveform frequency to continuously operate at the minimum interval frequency point within the predetermined range. Synchronously receive the spectrum analyzer data to generate the corresponding attenuation interference intensity curve. Then, adjust the attenuation amount according to the predetermined dB difference. Repeat the above steps to generate continuous and complete attenuation graph data. S22, generate standard interference intensity running slash; S23, calculating the standard interference intensity running slash line and the measured attenuation data obtained in step S21 to obtain a running gain correction data file, and the gain correction is completed; S24, the test equipment operates according to the operating gain correction data file, and monitors the first interference intensity curve by the monitoring antenna to be as close as possible to the standard interference intensity operating slope line to meet the measurement accuracy consistency requirements of different devices; S30, position antenna correction: replace the monitoring antenna with the position antenna and connect it to the spectrum analyzer, control the correction equipment to operate according to the parameters of the operating gain correction data file, obtain the second interference intensity curve corresponding to the position antenna, make the second interference intensity curve as close as possible to the standard interference intensity operating slope, adjust the position of the position antenna so that the second interference intensity curve measured by the position antenna coincides with the first interference intensity curve measured by the monitoring antenna, determine the position of the position antenna, and complete the position antenna correction.

2. The calibration method of wireless transmission signal anti-interference test equipment according to claim 1, characterized in that: After the calibration of the above steps S10, S20-S24, and S30 is completed, the signal generator operating parameters and the operating gain calibration data file are further loaded into the calibrated wireless transmission signal anti-interference test equipment for use during testing.

3. The calibration method of wireless transmission signal anti-interference test equipment according to claim 1, characterized in that: in, Step S10 specifically includes the following steps: S11, determining the minimum to maximum value of the interference spectrum density, and adjusting the computer control level to make the signal generator generate a fixed-point output frequency signal; S12, synchronously monitoring the spectrum signal, fine-tuning the control level, moving the spectrum signal to the 2.4 GHz frequency point, recording the level data as the starting value level, repeating the above steps, moving the spectrum signal to the 2.5 GHz frequency point, recording the level data at this time as the end value level, and storing it to form the signal generator operating parameters; S13, controlling the signal generator to generate a triangular wave or a trapezoidal wave within 2.4G-2.5G, and sending out an interference spectrum signal, so that the starting level and the ending level of the waveform are respectively set to the starting value level and the ending value level.

4. The calibration method of wireless transmission signal anti-interference test equipment according to claim 1, wherein: The attenuation in step S20 is repeated at intervals of -0.25 DB, and step S21 is continuously run until the attenuation reaches -32 DB, thereby obtaining continuous and complete attenuation map data.

5. The calibration method of wireless transmission signal anti-interference test equipment according to claim 3, characterized in that: In step S20 , the waveform frequency is continuously run from 0 to 5000 at the minimum interval frequency point, and the spectrum analyzer data is synchronously received, thereby generating the interference intensity curve corresponding to each attenuation value.

6. The calibration method of wireless transmission signal anti-interference test equipment according to claim 1, characterized in that: The standard interference intensity running slope in step S22 is a linear slope showing the variation of the interference intensity with the spectral density / amplitude of the control waveform frequency.

7. The calibration method of wireless transmission signal anti-interference test equipment according to claim 1, characterized in that: In step S23, the standard interference intensity running slope and the measured attenuation data are calculated. The specific operations are as follows: the standard interference intensity running slope is compared with the attenuation diagram of the measured data curve under different attenuation values, and the attenuation of each point on the standard interference intensity running slope relative to each measured interference intensity curve is calculated to form an operating gain correction data file, which is called during testing.

8. The calibration method for wireless transmission signal anti-interference test equipment according to claim 1, wherein: In step S30, the position of the positioning antenna is consistent with the position of the tested product and moves synchronously. The position and / or angle of the positioning antenna is adjusted by movement so that the second interference intensity curve measured by the positioning antenna coincides with the first interference intensity curve measured by the monitoring antenna, thereby determining the position of the positioning antenna.

9. The calibration method of the wireless transmission signal anti-interference test equipment as claimed in claim 1, characterized in that: The relative angle between the interference transmitting antenna and the position antenna is 85-95 degrees. The interference transmitting antenna is vertical and located at the width center of the test equipment, 110-130 cm away from the position antenna, and the height of the position antenna is 50-70 cm.

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