System and method for testing anti-interference capability of data link of unmanned aerial vehicle

Abstract

The invention discloses an unmanned aerial vehicle data link anti-interference capability test system and method in the technical field of communication engineering, and aims to solve the problems in the prior art, the system comprises an interference device, an error measurement device and a mobile terminal, and the error measurement device is connected with the mobile terminal. The signal bit error rate monitoring module is used for monitoring the signal bit error rate in the communication process between the unmanned aerial vehicle transceiving processing equipment and the ground transceiving processing equipment and outputting the signal bit error rate to the mobile terminal; the interference equipment is connected with the mobile terminal and is used for transmitting an interference signal to interfere communication between the unmanned aerial vehicle transceiving processing equipment and the ground transceiving processing equipment; and the mobile terminal is used for receiving the signal bit error rate output by the error measurement equipment and setting the working parameters of the interference equipment. According to the method, the anti-interference capability of the data link of the unmanned aerial vehicle can be tested in multiple dimensions, and flight accidents caused by insufficient anti-interference capability of the data link of the unmanned aerial vehicle are effectively reduced through analysis of test results in different dimensions.

Description

Technical Field

[0001] The invention relates to a system and method for testing the anti-interference capability of a data link of an unmanned aerial vehicle, and belongs to the technical field of communication engineering. Background Art

[0002] Currently, drones are used more and more widely in the commercial, military and public security fields. They can be applied to aerial photography and photography, farmland surveying, crop monitoring, fertilizer spraying, express delivery, cargo transportation and distribution of emergency medical supplies, inspection and monitoring of infrastructure such as power lines, pipelines, bridges, reconnaissance and surveillance, disaster monitoring and rescue, and many other work scenarios.

[0003] Although the drone data link uses digital technology, there are still problems such as signal transmission distance limitation, spectrum congestion and conflict, multipath interference, and anti-interference technology limitations. The anti-interference ability of the drone data link is not only related to the stability and reliability of communication, but also to the security of the system. If the data link is interfered or attacked, it may lead to data leakage, tampering or unauthorized control, which may pose risks and threats to drones and related systems. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a UAV data link anti-interference capability testing system and method, which can perform multi-dimensional testing on the UAV data link anti-interference capability, and effectively reduce flight accidents caused by insufficient UAV data link anti-interference capability through analysis of test results in different dimensions.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions: On the one hand, the present invention proposes a UAV data link anti-interference capability test system, wherein the UAV data link includes a UAV receiving and processing device and a ground transceiver processing device that communicate with each other, including an interference device, an error measurement device and a mobile terminal, wherein the error measurement device is connected to the mobile terminal, and is used to monitor the signal bit error rate during the communication process between the UAV transceiver processing device and the ground transceiver processing device, and output it to the mobile terminal; The jamming device is connected to the mobile terminal and is used to transmit a jamming signal to interfere with the communication between the UAV transceiver processing device and the ground transceiver processing device; The mobile terminal is used to receive the signal bit error rate output by the error measurement device and set the working parameters of the interference device.

[0006] Optionally, the interference device includes an interference signal generator, a power amplifier and an antenna. The interference signal generator is connected to the mobile terminal and is used to generate an interference signal source. The power amplifier is respectively connected to the interference signal generator and the antenna through a radio frequency cable. The power amplifier is used to amplify the interference signal and transmit it to the antenna. The antenna is used to transmit the interference signal.

[0007] Optionally, the antenna is a standard gain horn antenna.

[0008] Optionally, the operating parameters include baseband data, phase offset and filter type, and the baseband data includes interference signal frequency, interference signal power, interference signal type and interference signal bandwidth.

[0009] Optionally, the interference signal types include single-tone interference, comb spectrum pseudo-code modulation interference, and broadband noise interference.

[0010] On the other hand, the present invention provides a method for testing the anti-interference capability of a drone data link, comprising: Setting the working status of the UAV transceiver processing device and the ground transceiver processing device so that the UAV transceiver processing device can communicate with the ground transceiver processing device; The communication process is monitored by using an error rate measurement device to obtain the signal bit error rate under non-interference conditions; Set the test parameters, start the interference equipment to interfere, and use the error rate measurement equipment to monitor the communication process again to obtain the signal bit error rate under interference conditions; A comparative analysis was conducted on the signal bit error rate under undisturbed conditions and that under interfered conditions, and the difference between the signal bit error rate under undisturbed conditions and that under interfered conditions was used as the test result of the UAV data link anti-interference capability.

[0011] Furthermore, the working state is divided into an uplink and a downlink, the uplink is a signal transmitted by the ground transceiver processing device and the signal received by the UAV transceiver processing device, and the downlink is a signal transmitted by the UAV transceiver processing device and the signal received by the ground transceiver processing device.

[0012] Furthermore, the testing method is carried out in a microwave darkroom.

[0013] Furthermore, the working parameters include interference signal power, interference signal frequency, interference duration, interference device antenna polarization direction, and interference signal type.

[0014] Furthermore, the test method needs to be repeated n times, where n≥3.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a system for testing the anti-interference capability of a drone data link, which includes an interference device. The interference device can set its specific working parameters through a mobile terminal to adapt to different interference test requirements and is applicable to a variety of application scenarios. The testing method of the present invention can perform multi-dimensional testing on the anti-interference capability of the UAV data link. By analyzing the test results in different dimensions, the anti-interference capability of the UAV data link in the frequency domain, airspace, and time domain can be improved according to the test results, thereby ensuring the stability and reliability of the UAV's communication and data transmission in various complex environments, and effectively reducing flight accidents caused by insufficient anti-interference capability of the UAV data link. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a UAV data link anti-interference capability testing system in one embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of the jamming device of the UAV data link anti-jamming capability test system in one embodiment of the present invention; In the figure: 1 UAV transceiver processing equipment, 2 error measurement equipment, 3 mobile terminal, 4 interference equipment, 41 interference signal generator, 42 power amplifier, 43 antenna, 44 RF cable, 45 tripod, 5 microwave darkroom. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances. Example 1

[0019] like Figure 1 As shown, an embodiment of the present invention provides a UAV data link anti-interference capability test system, wherein the UAV data link includes a UAV receiving and processing device 1 and a ground transceiver processing device, and signal communication can be performed between the UAV receiving and processing device 1 and the ground transceiver processing device.

[0020] The test system includes an interference device 4, an error measurement device 2 and a mobile terminal 3. The interference device 4 and the error measurement device 2 are both connected to the mobile terminal 3. In this embodiment, the mobile terminal 3 is a computer, and the connection method is through a USB interface, but it is not limited to this. Other mobile terminals and connection methods that can realize signal transmission control should also be allowed.

[0021] The error measurement device 2 is used to monitor the signal bit error rate during the communication between the UAV transceiver processing device 1 and the ground transceiver processing device, and output it to the mobile terminal 3. The interference device 4 is used to transmit an interference signal to interfere with the communication between the UAV transceiver processing device 1 and the ground transceiver processing device. The mobile terminal 3 is used to receive the signal bit error rate output by the error measurement device 2 and set the working parameters of the interference device 4.

[0022] The working parameters include but are not limited to baseband data, phase offset and filter type, etc. The baseband data includes interference signal frequency, interference signal type and interference signal bandwidth. In this embodiment, the interference signal types involved are single-tone interference, comb spectrum pseudo-code modulation interference, and broadband noise interference.

[0023] Combination Figure 2 The interference device 4 includes an interference signal generator 41, a power amplifier 42 and an antenna 43. The interference signal generator 41 is connected to the mobile terminal 3 through a USB interface and is used to generate an interference signal source.

[0024] The power amplifier 4 is connected to the interference signal generator 41 and the antenna 43 via a radio frequency cable 44. The power amplifier 4 is configured to amplify the interference signal, and different amplification factors can be selected according to different application scenarios.

[0025] In this embodiment, the antenna 43 is disposed on a tripod 45 and is used to transmit interference signals. Antennas of different types and gains can be selected according to different application scenarios. In this embodiment, the antenna 43 selects a standard gain horn antenna. Example 2

[0026] On the basis of Example 1, the embodiment of the present invention provides a method for testing the anti-interference capability of a drone data link. In order to eliminate the influence of other signal interferences on the test results, the test method is preferably carried out in a microwave darkroom 5.

[0027] The test method includes the following steps: The working states of the UAV transceiver processing device 1 and the ground transceiver processing device are set so that the UAV transceiver processing device 1 can communicate with the ground transceiver processing device normally, wherein the working states are divided into uplink and downlink, the uplink is the ground transceiver processing device transmitting the signal and the UAV transceiver processing device 1 receiving the signal, and the downlink is the UAV transceiver processing device 1 transmitting the signal and the ground transceiver processing device receiving the signal.

[0028] The communication process is monitored by using the error rate measurement device 2 to obtain the signal bit error rate under non-interference conditions.

[0029] The test parameters are set, the interference device 4 is started to interfere, and the error rate measurement device 2 is used again to monitor the communication process to obtain the signal bit error rate under the interference condition.

[0030] Repeat the above operation n times, preferably, n≥3, compare and analyze the average signal bit error rate under undisturbed conditions and the average signal bit error rate under interfered conditions, and take the difference between the signal bit error rate under undisturbed conditions and the signal bit error rate under interfered conditions as the test result of the UAV data link anti-interference ability.

[0031] The following is a detailed description of the method for testing the anti-interference capability of the drone data link using the above-mentioned test system in conjunction with a specific embodiment. Example 3

[0032] The anti-interference capability test is carried out under the same interference signal power and different interference signal frequencies: Set up and connect all equipment in a microwave darkroom.

[0033] The signal source uses a standard binary random sequence as the test signal, the uplink is used as the test target, the mobile terminal uses a computer, the receiving antenna of the drone to be tested is an omnidirectional antenna, and the operating frequency range of the test drone is 1200~1400MHz.

[0034] During the communication process where the ground transceiver processing equipment transmits the signal and the drone transceiver processing equipment receives the signal, the error rate measurement equipment monitors it to obtain the signal bit error rate under non-interference conditions and transmits the data to the computer. It should be noted that the signal bit error rate is required to meet the performance indicators of the communication receiving equipment.

[0035] Start the jamming device to interfere, control the jamming power unchanged and maintain it at 6dBW, change the jamming power, and use the error rate measurement device to monitor at different jamming powers to obtain the signal bit error rate when the UAV transceiver processing device receives interference, and then transmit the data to the computer.

[0036] The test results are shown in Table 1: Table 1: Anti-interference ability test results at the same interference power and different interference frequencies

[0037] From the data analysis in Table 1, we can see that co-frequency interference is one of the important factors affecting the anti-interference capability of the UAV data link. The interference impact can be reduced through backup links or spectrum spread spectrum technology. At the same time, we should also pay attention to the rationality of the allocation of uplink and downlink links. For specific judgment basis, please refer to GJB6741-2009 "Criteria for Evaluation of Digital Communication Interference Effects". Example 4

[0038] The anti-interference capability test was carried out under the same interference power and different interference frequencies. The receiving antenna of the test drone was an omnidirectional antenna. The test method was the same as that in Example 3, except that the interference frequency was kept unchanged at 1250 MHz and the interference power was changed. The test results are shown in Table 2: Table 2: Anti-interference ability test results at the same interference power and different interference frequencies

[0039] From the data analysis in Table 2, we can see that the receiving antenna of the test drone is an omnidirectional antenna. High-power interference is one of the important factors affecting interference. The interference effect can be reduced by increasing the uplink transmission power and improving the signal-to-noise ratio. At the same time, a backup link can be selected to reduce the interference effect. For specific judgment basis, please refer to GJB6741-2009 "Criteria for Evaluation of Interference Effects of Digital Communications". Example 5

[0040] The anti-interference capability test was carried out under the same interference frequency, the same interference power, and different interference durations. The test method was the same as that in Example 3, except that the interference frequency was kept at 1250 MHz, the interference power was 0 dBW, and the interference time of the interference device was controlled. The test results are shown in Table 3: Table 3: Anti-interference ability test results under the same interference frequency, the same interference power, and different interference durations

[0041] From the data analysis in Table 3, we can see that the interference duration can also deteriorate the communication link. The interference impact can be reduced by optimizing the channel adaptive algorithm and intelligent interference suppression technology. For specific judgment basis, please refer to GJB6741-2009 "Criteria for Evaluation of Digital Communication Interference Effects". Example 6

[0042] The anti-interference capability test was carried out under the same interference frequency, the same interference power, and different interference directions. The receiving antenna of the tested UAV was a directional antenna. The test method was the same as that in Example 3, except that the interference frequency was kept at 1250 MHz, the interference power was 3 dBW, and the interference direction of the interference device was controlled. The test results are shown in Table 4: Table 4: Anti-interference ability test results under the same interference frequency, the same interference power, and different interference directions

[0043] From the data analysis in Table 4, it can be seen that since the receiving antenna of the UAV under test is a directional antenna with a larger gain in the 90° direction, it receives greater co-frequency interference. An omnidirectional antenna can be used under the condition that the data link gain is sufficient, and the UAV can adjust its flight attitude to avoid the direction of the interference signal, or use multi-antenna technology to change the beam direction of the receiving antenna to reduce the impact of interference. For specific judgment basis, please refer to GJB6741-2009 "Criteria for Evaluation of Interference Effects in Digital Communications". Example 7

[0044] The anti-interference capability test is carried out under the same interference frequency, the same interference power, and different interference device antenna polarization directions. The receiving antenna of the tested drone is an omnidirectional antenna and vertically polarized. The test method is the same as that of Example 3, except that the interference frequency is kept at 1250 MHz, the interference power is 3dBW, and the interference device antenna polarization direction is controlled. The test results are shown in Table 5: Table 5: Anti-interference capability test results at the same interference frequency, the same interference power, and different interference device antenna polarization directions

[0045] From the data in Table 5, we can see that the receiving antenna of the test drone is an omnidirectional antenna with vertical polarization. The antenna polarization mode is also one of the important factors affecting interference. The drone can adjust its flight attitude to avoid the direction of the interference signal and improve the signal-to-noise ratio to reduce the impact of interference. For specific judgment basis, please refer to GJB6741-2009 "Criteria for Evaluation of Interference Effects of Digital Communications". Example 8

[0046] The anti-interference capability test is performed under the same interference power and different interference signal types. The test method is the same as that of Example 3, except that the interference power is kept at 3dBW and the interference signal type is changed. The test results are shown in Table 6: Table 6: Anti-interference ability test results under the same interference power and different interference signal types

[0047] From the data in Table 6, we can see that the UAV data link system in this test has poor ability to resist single-tone interference. The Fast-ICA algorithm, JADE algorithm, Informax algorithm and other algorithms can be used to separate the interference signal and improve the signal-to-noise ratio to reduce the interference impact. For the commonly used AMP modulation mode used in the UAV data link system in this test, the anti-interference ability is insufficient when the comb spectrum pseudo-code modulation interference type is used. FQPSK-B and FQPSK-JR or OFDM modulation modes can be used to improve the spectrum utilization rate and effectively resist multipath effects and frequency selective fading. For specific judgment basis, please refer to GJB6741-2009 "Criteria for Evaluation of Interference Effects in Digital Communications".

[0048] Through the above test methods, the anti-interference capability of the drone data link is analyzed in detail from multiple dimensions, and the improvement of the anti-interference capability of the drone data link in the frequency domain, airspace, and time domain is proposed, such as software defined radio (SDR) technology, cognitive radio technology, encryption and security technology, spectrum spread spectrum technology, multi-antenna technology, optimized channel adaptive algorithm, intelligent interference suppression technology, etc. Through the continuous development and application of these technologies, it is expected to improve the anti-interference capability of the drone data link, thereby ensuring the stability and reliability of the drone's communication and data transmission in various complex environments. At the same time, when the drone receives electromagnetic interference during the flight mission, a response strategy is made, so that the drone can adjust the flight direction and flight attitude in time to avoid the interference signal direction and reduce flight accidents.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A UAV data link anti-interference capability test system, wherein the UAV data link comprises a UAV receiving and processing device and a ground receiving and processing device that communicate with each other, characterized in that: It includes an interference device, an error measurement device and a mobile terminal. The error measurement device is connected to the mobile terminal and is used to monitor the signal bit error rate during the communication process between the UAV transceiver processing device and the ground transceiver processing device, and output it to the mobile terminal; The jamming device is connected to the mobile terminal and is used to transmit a jamming signal to interfere with the communication between the UAV transceiver processing device and the ground transceiver processing device; The mobile terminal is used to receive the signal bit error rate output by the error measurement device and set the working parameters of the interference device.

2. The UAV data link anti-interference capability test system according to claim 1 is characterized in that: The interference device includes an interference signal generator, a power amplifier and an antenna. The interference signal generator is connected to the mobile terminal and is used to generate an interference signal source. The power amplifier is respectively connected to the interference signal generator and the antenna through a radio frequency cable. The power amplifier is used to amplify the interference signal and transmit it to the antenna. The antenna is used to transmit the interference signal.

3. The UAV data link anti-interference capability test system according to claim 2 is characterized in that: The antenna is a standard gain horn antenna.

4. The UAV data link anti-interference capability test system according to claim 1 is characterized in that: The operating parameters include baseband data, phase offset and filter type, and the baseband data includes interference signal frequency, interference signal power, interference signal type and interference signal bandwidth.

5. The UAV data link anti-interference capability test system according to claim 4 is characterized in that: The interference signal types include single-tone interference, comb spectrum pseudo-code modulation interference, and broadband noise interference.

6. A method for testing the anti-interference capability of a drone data link, characterized in that: include: Setting the working status of the UAV transceiver processing device and the ground transceiver processing device so that the UAV transceiver processing device can communicate with the ground transceiver processing device; The communication process is monitored by using an error rate measurement device to obtain the signal bit error rate under non-interference conditions; Set the test parameters, start the interference equipment to interfere, and use the error rate measurement equipment to monitor the communication process again to obtain the signal bit error rate under interference conditions; A comparative analysis was conducted on the signal bit error rate under undisturbed conditions and that under interfered conditions, and the difference between the signal bit error rate under undisturbed conditions and that under interfered conditions was used as the test result of the UAV data link anti-interference capability.

7. The method for testing the anti-interference capability of a drone data link according to claim 6, characterized in that: The working state is divided into an uplink and a downlink. The uplink is when the ground transceiver processing equipment transmits signals and the unmanned aerial vehicle transceiver processing equipment receives signals. The downlink is when the unmanned aerial vehicle transceiver processing equipment transmits signals and the ground transceiver processing equipment receives signals.

8. The method for testing the anti-interference capability of a drone data link according to claim 6, characterized in that: The test method is carried out in a microwave darkroom.

9. The method for testing the anti-interference capability of a drone data link according to claim 6, characterized in that: The working parameters include interference signal power, interference signal frequency, interference duration, interference device antenna polarization direction, and interference signal type.

10. The method for testing the anti-interference capability of a drone data link according to claim 6, characterized in that: The test method needs to be repeated n times, n≥3.

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