RF desensitization automatic test equipment and test method thereof

Abstract

The invention relates to the field of RF desensitization testing, in particular to RF desensitization automatic testing equipment and a testing method thereof, and the testing equipment comprises a baseband signal source module which is used for generating baseband digital or low-frequency voice signals with different waveforms such as analog AM / FM, digital FSK and PSK; the up-conversion unit is used for realizing frequency conversion of a higher-frequency radio-frequency signal; the audio signal analysis module is used for carrying out accurate frequency response measurement and detailed harmonic distortion analysis; the system also comprises a related communication interface module and an excitation antenna. The test method comprises the following specific steps: S1, setting a channel; s2, receiving a signal; s3, recording data; s4, recording a result; s5, repeating; s6, importing data; after the RF desensitization automatic test equipment is connected with the airborne equipment interface through the test interface, the system is automatically controlled to work by using the control instruction, so that the RF desensitization characteristic automatic test of the tested airborne radio frequency equipment is realized, and the test speed and precision of the system are improved.

Description

Technical Field

[0001] The invention relates to the field of RF desensitization testing, in particular to RF desensitization automatic testing equipment and a testing method thereof. Background Art

[0002] At present, quantitative testing of the sensitivity of airborne communication equipment in an installed environment and evaluation and analysis of the performance degradation of communication equipment in an actual installed environment are important indicators reflecting the product quality of airborne communication systems. They directly affect the aircraft's communication performance and flight safety. Therefore, relevant RF desensitization characteristic tests are required during aircraft manufacturing and repair. However, the current domestic system testing time through general testing methods is relatively long, and the test accuracy needs to be improved. Summary of the invention

[0003] In order to solve the above problems, the present invention provides an RF desensitization automatic test device and a test method thereof.

[0004] An RF desensitization automated test device, comprising:

[0005] Baseband signal source module, used to generate baseband digital or low-frequency voice signals of different waveforms such as analog AM / FM, digital FSK, and PSK;

[0006] Up-conversion unit, which realizes the frequency conversion of higher frequency RF signals;

[0007] Audio signal analysis module for precise frequency response measurement and detailed harmonic distortion analysis;

[0008] It also includes related communication interface modules and excitation antennas.

[0009] The baseband signal source module is based on high-performance arbitrary waveform parameters and radio frequency signal source output control.

[0010] The related communication interface modules include audio interface, RF interface and PXLe interface.

[0011] The excitation antenna radiates the signal required by the airborne radio frequency device, automatically adjusts the output power, and the output power increases in fixed steps.

[0012] The excitation antenna extracts the collected spatial radio frequency data through a remote control network port to obtain the actual emission spectrum characteristics of the airborne radio frequency device.

[0013] The space radio frequency data is controlled by a measurement and control computer, and the FC-AE-ASM protocol is used for message transmission.

[0014] The fixed step is ≯0.5dB.

[0015] A test method for RF desensitization automated test equipment, the specific steps of which are as follows:

[0016] S1. Set the channel: Use the RF desensitization test equipment to simulate the cockpit command to configure the onboard communication radio receiver to the channel and communication mode to be tested;

[0017] S2, receiving signal: using the ground baseband signal source module to communicate with the transceiver link of the airborne RF device, and judging whether the audio signal is received through the ground audio signal analysis module;

[0018] S3, record data: if no audio signal is received, control the baseband signal source module to increase the output power step by step until the audio signal analysis module receives the audio signal, stop signal power adjustment, keep stable for 1 to 2 seconds, and record the spectrum power reading and time stamp at this time, that is, obtain the receiving sensitivity value corresponding to the frequency f at that moment;

[0019] S4. Record the results: disconnect the ground communication signal output, record the spectrum power reading and time stamp, that is, obtain the noise interference level corresponding to the frequency f at that moment; and record and save the scanning test curve results on the spectrum analyzer for 3 consecutive seconds;

[0020] S5, repeat: change to the next test channel or frequency through the RF desensitization test equipment, and repeat steps S2 to S5 until all channel frequencies are completed or the test procedure is terminated;

[0021] S6. Import data: take relevant RF attenuation coefficients into account and correct the real-time correction of the test data.

[0022] The frequency of the channel in step S1 is f, and the channel of the communication mode is AM or FM.

[0023] The signal-to-noise ratio of the audio signal in step S3 is not less than 9dB.

[0024] The beneficial effects of the present invention are as follows: after the RF desensitization automatic test equipment is connected to the airborne device interface through the test interface, the control command is used to automatically control the system operation, thereby realizing the automatic test of the RF desensitization characteristics of the airborne radio frequency device under test, and improving the system test speed and accuracy; the working parameters of the airborne radio frequency device and the baseband signal source module are automatically controlled by the measurement and control computer, and the equipment is designed through the RF desensitization automatic test process, thereby realizing the RF desensitization automatic test function of the airborne communication equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a schematic diagram of the principle of the RF desensitization automatic test system of the present invention;

[0027] Figure 2 It is a block diagram of the RF desensitization automatic test equipment of the present invention;

[0028] Figure 3 It is a schematic diagram of the RF desensitization automated testing process of the present invention. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below.

[0030] like Figures 1 to 3 As shown, an RF desensitization automatic test equipment comprises:

[0031] Baseband signal source module, used to generate baseband digital or low-frequency voice signals of different waveforms such as analog AM / FM, digital FSK, and PSK;

[0032] Up-conversion unit, which realizes the frequency conversion of higher frequency RF signals;

[0033] Audio signal analysis module for precise frequency response measurement and detailed harmonic distortion analysis;

[0034] It also includes related communication interface modules and excitation antennas.

[0035] The baseband signal source module is based on high-performance arbitrary waveform parameters and RF signal source output control. The ground RF signal source output is achieved by controlling the baseband signal source and up-conversion unit module through a measurement and control computer, using an excitation antenna to radiate the signal required by the airborne RF equipment and automatically adjusting the output power.

[0036] The related communication interface modules include an audio interface, an RF interface, and a PXLe interface. After the RF desensitization automatic test equipment is connected to the airborne equipment interface through the test interface, the control command is used to automatically control the system to work, thereby realizing the automatic test of the RF desensitization characteristics of the airborne radio frequency equipment under test, thereby improving the system test speed and accuracy.

[0037] The excitation antenna radiates the signal required by the airborne radio frequency device, automatically adjusts the output power, and increases the output power in fixed steps. When the airborne radio frequency device effectively receives and demodulates the communication signal for the first time, the spectrum reading at this time is recorded as the first sensitivity test result. The measurement and control computer initializes the output power of the ground radio frequency signal source, repeats the above sensitivity test, and obtains the second sensitivity test result. The average of the cycle n times is the sensitivity value under the parameter setting, which means that the desensitization test of the airborne radio frequency device parameter setting is completed.

[0038] The excitation antenna extracts the collected spatial radio frequency data through the remote control network port, obtains the actual emission spectrum characteristics of the airborne radio frequency equipment, forms a waterfall diagram of the relationship between the spectrum and time, and converts it into the equipment working status and time.

[0039] The space radio frequency data is controlled by a measurement and control computer, and the FC-AE-ASM protocol is used for message transmission. When the desensitization test is completed, the control software in the measurement and control computer can automatically adjust the parameters of the airborne radio frequency equipment through the FC debugging interface.

[0040] The control software is LABVIEW for programming control.

[0041] Before the test, the number and content of parameter adjustments to be performed are preset. After each parameter setting desensitization test is completed, the next parameter setting test is automatically entered until all parameter setting tests are completed, and a statistical analysis report of the test results is given.

[0042] The operating parameters of the airborne RF equipment and baseband signal source module are automatically controlled by the measurement and control computer. The equipment is designed with the RF desensitization automatic test process to realize the RF desensitization automatic test function of the airborne communication equipment.

[0043] The fixed step is ≯0.5dB.

[0044] A test method for RF desensitization automated test equipment, the specific steps of which are as follows:

[0045] S1. Set the channel: Use the RF desensitization test equipment to simulate the cockpit command to configure the onboard communication radio receiver to the channel and communication mode to be tested;

[0046] S2, receiving signal: using the ground baseband signal source module to communicate with the transceiver link of the airborne RF device, and judging whether the audio signal is received through the ground audio signal analysis module;

[0047] S3, record data: if no audio signal is received, control the baseband signal source module to increase the output power step by step until the audio signal analysis module receives the audio signal, stop signal power adjustment, keep stable for 1 to 2 seconds, and record the spectrum power reading and time stamp at this time, that is, obtain the receiving sensitivity value corresponding to the frequency f at that moment;

[0048] S4. Record the results: disconnect the ground communication signal output, record the spectrum power reading and time stamp, that is, obtain the noise interference level corresponding to the frequency f at that moment; and record and save the scanning test curve results on the spectrum analyzer for 3 consecutive seconds, and save them in the spectrum waterfall format;

[0049] S5, repeat: change to the next test channel or frequency through the RF desensitization test equipment, and repeat steps S2 to S5 until all channel frequencies are completed or the test procedure is terminated;

[0050] S6. Import data: take into account the relevant RF attenuation coefficients and correct the test data in real time. The correction coefficients can be imported before testing.

[0051] The frequency of the channel in step S1 is f, and the channel of the communication mode is AM or FM.

[0052] The signal-to-noise ratio of the audio signal in step S3 is not less than 9dB.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An RF desensitization automated test device, characterized in that: include: Baseband signal source module, used to generate baseband digital or low-frequency voice signals of different waveforms such as analog AM / FM, digital FSK, and PSK; Up-conversion unit, which realizes the frequency conversion of higher frequency RF signals; Audio signal analysis module for precise frequency response measurement and detailed harmonic distortion analysis; It also includes related communication interface modules and excitation antennas.

2. The RF desensitization automated test equipment according to claim 1, characterized in that: The baseband signal source module is based on high-performance arbitrary waveform parameters and radio frequency signal source output control.

3. The RF desensitization automated testing device according to claim 1, characterized in that: The related communication interface modules include audio interface, RF interface and PXLe interface.

4. The RF desensitization automated test equipment according to claim 1, characterized in that: The excitation antenna radiates the signal required by the airborne radio frequency device, automatically adjusts the output power, and the output power increases in fixed steps.

5. The RF desensitization automated testing device according to claim 1, characterized in that: The excitation antenna extracts the collected spatial radio frequency data through a remote control network port to obtain the actual emission spectrum characteristics of the airborne radio frequency device.

6. The RF desensitization automated test equipment according to claim 5, characterized in that: The space radio frequency data is controlled by a measurement and control computer, and the FC-AE-ASM protocol is used for message transmission.

7. The RF desensitization automated test equipment according to claim 4, characterized in that: The fixed step is ≯0.5dB.

8. A testing method using a RF desensitization automated testing device according to any one of claims 1 to 7, characterized in that: The specific steps are as follows: S1. Set the channel: Use the RF desensitization test equipment to simulate the cockpit command to configure the onboard communication radio receiver to the channel and communication mode to be tested; S2, receiving signal: using the ground baseband signal source module to communicate with the transceiver link of the airborne RF device, and judging whether the audio signal is received through the ground audio signal analysis module; S3, record data: if no audio signal is received, control the baseband signal source module to increase the output power step by step until the audio signal analysis module receives the audio signal, stop signal power adjustment, keep stable for 1 to 2 seconds, and record the spectrum power reading and time stamp at this time, that is, obtain the receiving sensitivity value corresponding to the frequency f at that moment; S4. Record the results: disconnect the ground communication signal output, record the spectrum power reading and time stamp, that is, obtain the noise interference level corresponding to the frequency f at that moment; and record and save the scanning test curve results on the spectrum analyzer for 3 consecutive seconds; S5, repeat: change to the next test channel or frequency through the RF desensitization test equipment, and repeat steps S2 to S5 until all channel frequencies are completed or the test procedure is terminated; S6. Import data: take relevant RF attenuation coefficients into account and correct the real-time correction of the test data.

9. A test method for RF desensitization automated test equipment according to claim 8, characterized in that: The frequency of the channel in step S1 is f, and the channel of the communication mode is AM or FM.

10. The testing method of RF desensitization automatic testing equipment according to claim 8, characterized in that: The signal-to-noise ratio of the audio signal in step S3 is not less than 9dB.

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