Antenna near-field external mixing multi-frequency-point test acquisition system and antenna near-field external mixing multi-frequency-point test acquisition method

Abstract

The invention discloses an antenna near-field external mixing multi-frequency-point test acquisition system and method, and relates to the technical field of antenna test. The system is composed of a scanning frame, a pulse synchronizer, a radio frequency signal source, a local oscillator signal source, a vector network analyzer and the like, a control computer controls the scanning frame to move and generates trigger pulses, the pulse synchronizer generates synchronous pulses accordingly, the radio frequency signal source and the local oscillator signal source are synchronously triggered to be switched and output according to a preset frequency list, and after being processed by a frequency mixer, the signals are sent to the vector network analyzer. The vector network analyzer analyzes the signals and transmits the data to the computer to generate a report. The method comprises the steps of moving the scanning frame, generating synchronous pulses, switching frequencies, processing signals, collecting and analyzing data, testing circularly, outputting results and the like. According to the scheme, equipment collaboration is achieved through the external pulse synchronizer, instrument trigger limitation is broken through, long-distance test delay is reduced, multi-frequency-point test efficiency is improved, cost is reduced, the method is suitable for automatic test, and test precision and feasibility are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna testing, and particularly to an antenna near-field external mixing multi-frequency point test acquisition system and method. Background Art

[0002] In the current context of the rapid development of communication technologies, higher requirements are placed on the performance of communication antennas in fields such as mobile communication and the Internet of Things. As the core component for wireless signal transmission and reception, the performance testing during the design, production, and deployment of antennas has become a crucial link. Especially in antenna pattern testing, a large amount of data needs to be quickly collected, and extremely high requirements are imposed on the time synchronization of multi-frequency point testing. Any data error may lead to a decrease in the overall testing accuracy.

[0003] Currently, the mainstream antenna testing solutions on the market mostly adopt the mode of a vector network analyzer or a self-developed antenna test receiver combined with two signal sources. Although this method can achieve the synchronization of collected data, it has significant limitations: on the one hand, the deployment and implementation cost is high, and it must rely on instruments with transceiver trigger functions, which restricts the application of low-cost receivers; on the other hand, when the instrument spacing is relatively far, the serial pulse transmission delay is obvious, and the time cost increases significantly. It needs to wait for the feedback of the previous device to complete the testing of each frequency point, resulting in low efficiency of multi-frequency point testing. In addition, for instruments without trigger functions, the traditional solution is not applicable and it is difficult to meet the requirements of diverse testing scenarios.

[0004] Therefore, how to break through the instrument trigger function limitation, reduce the time cost of long-distance testing, and achieve efficient synchronization of multi-frequency point testing while ensuring the testing accuracy has become an urgent problem to be solved in the technical field of antenna testing. Summary of the Invention

[0005] The purpose of the present invention is to provide an antenna near-field external mixing multi-frequency point test acquisition system and method to solve the problem that testing cannot be carried out due to excessive distance or the lack of trigger generation in the receiver and signal source in the above background art.

[0006] The present invention is achieved through the following technical solutions: An antenna near-field external mixing multi-frequency point test acquisition system includes: a scanning frame, a pulse synchronizer, a radio frequency signal source, a local oscillator signal source, a vector network analyzer, a transmitting mixer, a receiving mixer, a control computer, and an installation table, where: Scanning frame: The scanning frame receives the control instruction issued by the control computer and accurately moves to the test position to generate a trigger pulse; Pulse synchronizer: Receives the trigger pulse generated by the scanning frame to generate a synchronous pulse and synchronously trigger the radio frequency signal source, the local oscillator signal source, and the vector network analyzer.

[0007] RF signal source and local oscillator signal source: After receiving the synchronization pulse, switch the output frequencies of the RF signal source and the local oscillator signal source, and output the RF signal and the local oscillator signal.

[0008] Transmitter mixer: Mix and down-convert the RF signal and the local oscillator signal to obtain the transmitted signal and the reference signal, and send them to the scanning frame and the vector network analyzer respectively; Mounting table: A fixed axis and a receiving antenna are set, and the receiving antenna receives the transmitted signal of the transmitting antenna; Receiver mixer: Used to receive the received signal generated by the transmitting signal of the receiving antenna and the local oscillator signal generated by the local oscillator signal source, down-convert the received signal and the local oscillator signal to obtain the test signal and input it to the test port of the vector network analyzer; Vector network analyzer: Used to receive the synchronization pulse generated by the pulse synchronizer, the reference signal generated by the transmitter mixer, and the test signal generated by the receiver mixer, and analyze the test signal to obtain the analysis data and send it to the control computer; Control computer: Preset the motion path and the distance trigger interval to control the movement of the scanning frame and generate trigger pulses.

[0009] Furthermore, The scanning frame receives the instruction sent by the control computer through the LAN port and moves to the test point according to the instruction, sends a position confirmation signal to the control computer, generates a trigger pulse to the pulse synchronizer after the position of the scanning frame is correct, and a motion axis and a transmitting antenna are set on the scanning frame.

[0010] Furthermore, A pulse trigger number threshold is preset in the pulse synchronizer. The pulse synchronizer receives the trigger pulse generated by the scanning frame, and generates the same number of synchronization pulses as the pulse trigger number threshold as the activation signal and synchronizes them to the RF signal source, the local oscillator signal source, and the vector network analyzer.

[0011] Furthermore, An RF frequency list and a local oscillator frequency list are respectively preset in the RF signal source and the local oscillator signal source. Every time the RF signal source and the local oscillator signal source receive a synchronization pulse, the RF signal source and the local oscillator signal source respectively switch the output frequency once in the order of the frequency points in the RF frequency list and the local oscillator frequency list, and the output frequency is the same as the frequency point, and output the RF signal and the local oscillator signal to the transmitter mixer. At the same time, the local oscillator signal source transmits the local oscillator signal to the receiver mixer.

[0012] Furthermore, The transmitting mixer mixes the RF signal with the local oscillator signal and then transmits the mixed signal to the transmitting antenna to generate a transmitted signal. The RF signal and the local oscillator signal are down-converted to obtain a reference signal, which is input to the reference port of the vector network analyzer. Both the transmitted signal and the reference signal are filtered by a band-pass filter before being output.

[0013] Further, The vector network analyzer is built-in with a digital signal processor, which filters the collected test signals in real time, and converts the reference signal and the test signal into analog-to-digital signals to generate analysis data of amplitude and phase based on the reference signal.

[0014] Further, The preset distance trigger interval in the control computer refers to the fixed interval distance that the moving axis moves with the scanning frame.

[0015] Further, The number of frequency points in the RF frequency list and the local oscillator frequency list is the same as the pulse trigger number threshold.

[0016] Further, An antenna near-field external mixing multi-frequency point test and acquisition method can be applied to the above-mentioned antenna near-field external mixing multi-frequency point test and acquisition system, and includes the following steps: S1. Control the movement of the scanning frame: The control computer sends instructions to the scanning frame according to the preset movement path and distance trigger interval. The scanning frame accurately moves along the movement path to the specified test position according to the instructions and generates a trigger pulse after arrival. S2. Synchronous pulse generation: The pulse synchronizer receives the trigger pulse from the scanning frame, generates the same number of synchronous pulses according to the preset pulse trigger number threshold, and synchronously sends them to the RF signal source, the local oscillator signal source, and the vector network analyzer in sequence. S3. Frequency switching and signal output: Each time the RF signal source and the local oscillator signal source receive a synchronous pulse, they switch and output frequencies according to the preset RF frequency list and local oscillator frequency list respectively to generate an RF signal and a local oscillator signal. S4. Processing of the RF signal and the local oscillator signal: The transmitting mixer receives the RF signal and the local oscillator signal, mixes and down-converts them to generate a transmitted signal and a reference signal respectively. The transmitted signal is sent to the transmitting antenna of the scanning frame, and the transmitted signal is input to the reference port of the vector network analyzer. S5. Processing of the received signal: The receiving mixer receives the received signal obtained by the receiving antenna on the mounting table capturing the transmitted signal from the transmitting antenna, down-converts the received signal with the local oscillator signal, generates a test signal, and inputs it to the test port of the vector network analyzer. S6. Data acquisition and analysis: Under the trigger of a synchronous pulse, the vector network analyzer synchronously acquires the reference signal and the test signal, performs analog-to-digital conversion, real-time filtering, and amplitude / phase analysis to generate test data; S7. Loop execution: Repeat steps S1 - S6, move the scanning frame to the next test point according to the preset movement path and distance trigger interval, and traverse all frequency points in each frequency list to complete the automated test of multiple positions and multiple frequency points; S8. Result storage and output: The control computer aggregates the analysis data of the vector network analyzer, stores it, and generates a test report to complete the entire test process.

[0017] The beneficial effects of the present invention are as follows: 1. Traditional antenna testing relies on the transceiver trigger function of the instrument itself, and there is a significant delay when transmitting serial pulses over long distances, resulting in high time costs and low flexibility in equipment replacement. The present invention receives the trigger pulse of the scanning frame through an external pulse synchronizer and synchronously generates multi-channel activation signals, enabling the collaborative work of the radio frequency signal source, the local oscillator signal source, and the vector network analyzer without the instrument having a trigger function. For low-cost receivers that do not support the trigger function, or in scenarios where the instrument spacing in the test site exceeds 10 meters, traditional serial pulses need to be transmitted back and forth multiple times, while the synchronous pulse mechanism avoids signal round-trip loss through centralized triggering, reduces the single-trigger response time, and improves the feasibility and efficiency of long-distance testing.

[0018] 2. Traditional testing uses a serial pulse loop mechanism, and it is necessary to wait for the feedback of the previous device after each frequency point is completed, resulting in a linear increase in the time-consuming of multi-frequency point testing at a single position with the number of frequency points. The present invention converts a single scanning frame trigger pulse into synchronous pulses consistent with the number of frequency points through a pulse synchronizer, simultaneously triggers the radio frequency signal source, the local oscillator signal source, and the vector network analyzer. The radio frequency signal source and the local oscillator signal source switch their outputs according to their respective frequency lists, and trigger the vector network analyzer to synchronously collect data at each frequency point in real time, improving efficiency. Brief description of the drawings

[0019] Figure 1 is a schematic diagram of the system of the present invention; Figure 2 is a flowchart of the method applied to the system of the present invention. Detailed implementation manners

[0020] The following combines the embodiments and the drawings to further elaborate on the present invention in detail, but the implementation manners of the present invention are not limited thereto.

[0021] Embodiment

[0022] See Figures 1 to 2 : An antenna near-field external mixing multi-frequency point test acquisition system, comprising: a scanning frame, a pulse synchronizer, a radio frequency signal source, a local oscillator signal source, a vector network analyzer, a transmitting mixer, a receiving mixer, a control computer, and an installation platform, where: Scanning frame: The scanning frame receives the control instructions sent by the control computer, accurately moves to the test position, and generates a trigger pulse. Pulse synchronizer: Receives the trigger pulse generated by the scanning frame, generates a synchronous pulse, and synchronously triggers the radio frequency signal source, the local oscillator signal source, and the vector network analyzer.

[0023] Radio frequency signal source and local oscillator signal source: After receiving the synchronous pulse, switch the output frequencies of the radio frequency signal source and the local oscillator signal source, and output a radio frequency signal and a local oscillator signal.

[0024] Transmitting mixer: Mixes and down-converts the radio frequency signal and the local oscillator signal to obtain a transmitted signal and a reference signal, and sends them to the scanning frame and the vector network analyzer respectively. Installation platform: A fixed axis and a receiving antenna are provided. The receiving antenna receives the transmitted signal of the transmitting antenna. Receiving mixer: Used to receive the received signal generated by the receiving antenna due to the transmitted signal and the local oscillator signal generated by the local oscillator signal source, down-convert the received signal and the local oscillator signal to obtain a test signal, and input it to the test port of the vector network analyzer. Vector network analyzer: Used to receive the synchronous pulse generated by the pulse synchronizer, the reference signal generated by the transmitting mixer, and the test signal generated by the receiving mixer, and analyze the test signal to obtain analysis data and send it to the control computer. Control computer: Presets a motion path and a distance trigger interval to control the movement of the scanning frame and generate trigger pulses.

[0025] Furthermore, The scanning frame receives the instructions sent by the control computer through the LAN port, moves to the test point according to the instructions, sends a position confirmation signal to the control computer. After the position of the scanning frame is correct, a trigger pulse is generated to the pulse synchronizer, and a motion axis and a transmitting antenna are provided on the scanning frame.

[0026] Receiving instructions through the LAN port and feedbacking a position confirmation signal ensure the accuracy and reliability of the movement of the scanning frame, and avoid inaccurate test data caused by instruction transmission errors or position deviations. The generation mechanism of the trigger pulse can achieve strict synchronization between the position of the scanning frame and signal acquisition, and improve the coordination of the test process.

[0027] In an embodiment, the control computer sends instructions to the scanning frame through the LAN port, causing it to move to the first test point at 5-cm intervals along a preset path. After the scanning frame arrives, it sends a position confirmation signal to the computer. After confirmation, a trigger pulse is generated to trigger devices such as the RF signal source to start working, ensuring that the signal acquisition at each test position is based on precise positioning and the pulse synchronizer receives the trigger pulse through the BNC interface and receives the instructions issued by the control software through the COM port.

[0028] Further, A pulse trigger number threshold is preset in the pulse synchronizer. The pulse synchronizer receives the trigger pulses generated by the scanning frame and generates the same number of synchronization pulses as the pulse trigger number threshold as activation signals and synchronously sends them to the RF signal source, the local oscillator signal source, and the vector network analyzer.

[0029] The preset pulse trigger number threshold in the pulse synchronizer allows the system to quickly generate the same number of activation signals as the pulse trigger number threshold as needed, and the number of activation signals corresponds one-to-one with the frequency points in the RF frequency list and the local oscillator frequency list, and together with the working mechanism of the pulse synchronizer, ensures that each device works strictly synchronously, eliminating the influence of timing deviation on the mixed-frequency signal. The design of circularly sending synchronization pulses supports multi-frequency point automated testing, significantly improving the testing efficiency, especially suitable for the fast sweep frequency requirements of wide-band antennas.

[0030] In an embodiment, the preset pulse trigger number threshold of the pulse synchronizer is 10. After the trigger pulse of the scanning frame is input, the synchronizer generates 10 synchronization pulses, sequentially triggering the RF signal source and the local oscillator signal source to switch to each frequency point in the list, such as sequentially switching from 1 GHz to 10 GHz, and at the same time triggering the vector network analyzer to synchronously collect data at each frequency point to complete the continuous testing of 10 frequency points.

[0031] Further, An RF frequency list and a local oscillator frequency list are respectively preset in the RF signal source and the local oscillator signal source. Each time the RF signal source and the local oscillator signal source receive a synchronization pulse, the RF signal source and the local oscillator signal source respectively switch the output frequency once in the order of the frequency points in the RF frequency list and the local oscillator frequency list, and the output frequency is the same as the frequency point, and output the RF signal and the local oscillator signal to the transmitting mixer, and the local oscillator signal source simultaneously transmits the local oscillator signal to the receiving mixer.

[0032] The independent RF and local oscillator frequency lists support flexible frequency point combinations to meet the requirements of complex testing scenarios (such as harmonic analysis or intermodulation testing); the synchronous switching mechanism ensures the frequency consistency of the mixed-frequency signal, avoiding the phase mismatch between the reference signal and the test signal caused by the asynchronous signal sources, thereby improving the measurement accuracy.

[0033] Further, The transmitting mixer mixes the RF signal with the local oscillator signal and then transmits it to the transmitting antenna to generate a transmitted signal. The RF signal and the local oscillator signal are down-converted to obtain a reference signal, which is input to the reference port of the vector network analyzer. Both the transmitted signal and the reference signal are filtered by a band-pass filter before being output.

[0034] Furthermore, The vector network analyzer is built-in with a digital signal processor, which filters the collected test signal in real time and performs analog-to-digital conversion on the reference signal and the test signal to generate analysis data of the amplitude and phase based on the reference signal.

[0035] The built-in digital signal processor filters, amplifies the signal and performs analog-to-digital conversion in real time, which can enhance the readability of weak signals, suppress noise interference, ensure the accuracy of amplitude and phase data, and provide a reliable basis for subsequent analysis.

[0036] For example, when a weak test signal (such as -80 dBm) is collected by the receiving antenna, the vector network analyzer first removes the environmental noise through a digital filter, then amplifies the signal, and then converts the analog signal into a digital signal to generate accurate amplitude and phase data for analyzing the frequency response characteristics of the antenna.

[0037] Furthermore, The preset distance trigger interval in the control computer refers to the fixed interval distance that the moving axis moves with the scanning frame.

[0038] Presetting the motion path and the distance trigger interval can achieve the automatic path planning and fixed-point testing of the scanning frame, avoid path deviation or missing test points caused by manual operation, and improve the consistency and efficiency of testing.

[0039] In one embodiment, a coordinate system is established for the antenna near-field plane. The control computer presets the motion path as a straight line from the coordinate (0, 0, 0) to (100, 0, 0), and the distance trigger interval is 10 cm. The scanning frame moves along this path and triggers a test every 10 cm, collecting data at 10 positions in sequence to cover the entire scanning area and ensure a comprehensive evaluation of the antenna near-field characteristics.

[0040] Furthermore, The number of frequency points in both the RF frequency list and the local oscillator frequency list is the same as the pulse trigger number threshold.

[0041] So that each generated synchronization pulse can correspond to the frequency switched by a RF signal source and a local oscillator signal source, and at the same time make the generated reference signal and test signal correspond to each other.

[0042] Furthermore, An antenna near-field external mixing multi-frequency point test and acquisition method, which can be applied to the above-mentioned antenna near-field external mixing multi-frequency point test and acquisition system, includes the following steps: S1. Control the movement of the scanning frame: The control computer sends instructions to the scanning frame according to the preset movement path and distance trigger interval. The scanning frame accurately moves along the movement path to the specified test position according to the instructions and generates a trigger pulse after arrival; S2. Synchronous pulse generation: The pulse synchronizer receives the trigger pulse from the scanning frame, generates the same number of synchronous pulses according to the preset pulse trigger number threshold and synchronously sends them to the RF signal source, local oscillator signal source and vector network analyzer in sequence; S3. Frequency switching and signal output: Each time the RF signal source and the local oscillator signal source receive a synchronous pulse, they switch and output frequencies according to the preset RF frequency list and local oscillator frequency list respectively to generate an RF signal and a local oscillator signal; S4. RF signal and local oscillator signal processing: The transmitting mixer receives the RF signal and the local oscillator signal, mixes and down-converts them to generate a transmitting signal and a reference signal respectively. The transmitting signal is sent to the transmitting antenna of the scanning frame, and the transmitting signal is input to the reference port of the vector network analyzer; S5. Received signal processing: The receiving mixer receives the received signal captured by the receiving antenna on the mounting table from the transmitting antenna, down-converts the received signal and the local oscillator signal to generate a test signal and inputs it to the test port of the vector network analyzer; S6. Data acquisition and analysis: The vector network analyzer synchronously acquires the reference signal and the test signal under the trigger of the synchronous pulse, performs analog-to-digital conversion, real-time filtering and amplitude / phase analysis to generate test data; S7. Loop execution: Repeat steps S1-S6, move the scanning frame to the next test point according to the preset movement path and distance trigger interval, and traverse all frequency points in each frequency list to complete the automatic test of multiple positions and multiple frequency points; S8. Result storage and output: The control computer aggregates the analysis data of the vector network analyzer, stores it and generates a test report to complete the entire test process.

[0043] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention / invention. However, the present invention / invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention / invention, and these modifications and improvements are also regarded as the protection scope of the present invention / invention.

Claims

1. An antenna near-field external mixing multi-frequency point test and acquisition system, characterized in that Including: A scanning frame, a pulse synchronizer, a radio frequency signal source, a local oscillator signal source, a vector network analyzer, a transmitting mixer, a receiving mixer, a control computer, and a mounting table. Among them: Scanning frame: The scanning frame receives the control instructions sent by the control computer and accurately moves to the test position to generate trigger pulses; Pulse synchronizer: Receives the trigger pulses generated by the scanning frame to generate synchronization pulses and synchronously trigger the radio frequency signal source, the local oscillator signal source, and the vector network analyzer; Radio frequency signal source and local oscillator signal source: After receiving the synchronization pulses, switch the output frequencies of the radio frequency signal source and the local oscillator signal source, and output radio frequency signals and local oscillator signals; Transmitting mixer: Mixes and down-converts the radio frequency signal and the local oscillator signal to obtain a transmitted signal and a reference signal, and sends them to the scanning frame and the vector network analyzer respectively; Mounting table: A fixed axis and a receiving antenna are provided, and the receiving antenna receives the transmitted signal of the transmitting antenna; Receiving mixer: Used to receive the received signal generated by the transmitting signal of the receiving antenna and the local oscillator signal generated by the local oscillator signal source, down-convert the received signal and the local oscillator signal to obtain a test signal and input it to the test port of the vector network analyzer; Vector network analyzer: Used to receive the synchronization pulses generated by the pulse synchronizer, the reference signal generated by the transmitting mixer, and the test signal generated by the receiving mixer, and analyze the test signal to obtain analysis data and send it to the control computer; Control computer: Presets a motion path and a distance trigger interval to control the movement of the scanning frame and generate trigger pulses, aggregates the analysis data of the vector network analyzer and generates a test report.

2. The antenna near-field external mixing multi-frequency point test and acquisition system according to claim 1, wherein The scanning frame receives the instructions sent by the control computer through the LAN port and moves to the test point according to the instructions, sends a position confirmation signal to the control computer, generates a trigger pulse to the pulse synchronizer after the position of the scanning frame is correct, and a motion axis and a transmitting antenna are provided on the scanning frame.

3. An antenna near-field external mixing multi-frequency point test and acquisition system according to claim 2, characterized in that, A pulse trigger number threshold is preset in the pulse synchronizer. The pulse synchronizer receives the trigger pulses generated by the scanning frame and generates the same number of synchronization pulses as the trigger number threshold as activation signals and synchronously sends them to the radio frequency signal source, the local oscillator signal source, and the vector network analyzer.

4. An antenna near-field external mixing multi-frequency point test and acquisition system according to claim 3, characterized in that, A radio frequency frequency list and a local oscillator frequency list are respectively preset in the radio frequency signal source and the local oscillator signal source. Each time the radio frequency signal source and the local oscillator signal source receive a synchronization pulse, the radio frequency signal source and the local oscillator signal source respectively switch the output frequency once in the order of the frequency points in the radio frequency frequency list and the local oscillator frequency list, and the output frequency is the same as the frequency point, and output radio frequency signals and local oscillator signals to the transmitting mixer. The local oscillator signal source simultaneously transmits the local oscillator signal to the receiving mixer.

5. An antenna near-field external mixing multi-frequency point test and acquisition system according to claim 4, characterized in that, The transmitting mixer mixes the radio frequency signal and the local oscillator signal and then transmits them to the transmitting antenna. The transmitting antenna generates a transmitted signal and transmits it to the receiving antenna. After down-converting the radio frequency signal and the local oscillator signal, a reference signal is input to the reference port of the vector network analyzer. Both the transmitted signal and the reference signal are filtered by a band-pass filter and then output.

6. The antenna near-field external mixing multi-frequency point test and acquisition system according to claim 5, characterized in that The built-in digital signal processor of the vector network analyzer performs real-time filtering on the acquired test signals, and performs analog-to-digital conversion on the reference signal and the test signal to generate analysis data of the amplitude and phase based on the reference signal.

7. An antenna near-field external mixing multi-frequency point test and acquisition system according to claim 2, characterized in that, The preset distance trigger interval in the control computer refers to the fixed interval distance that the motion axis moves with the scanning frame.

8. An antenna near-field external mixing multi-frequency point test and acquisition system according to claim 4, characterized in that The number of frequency points in both the radio frequency frequency list and the local oscillator frequency list is the same as the pulse trigger number threshold.

9. A method for testing and collecting multi-frequency points of antenna near-field external mixing, which can be applied to the antenna near-field external mixing multi-frequency point testing and collecting system described in claims 1 to 8, is characterized in that, It includes the following steps: S1. Control the movement of the scanning frame: The control computer sends instructions to the scanning frame according to the preset motion path and distance trigger interval. The scanning frame accurately moves along the motion path to the specified test position according to the instructions and generates a trigger pulse after arrival. S2. Synchronous pulse generation: The pulse synchronizer receives the trigger pulse of the scanning frame, generates the same number of synchronous pulses according to the preset pulse trigger number threshold, and synchronously sends them to the radio frequency signal source, the local oscillator signal source, and the vector network analyzer in sequence. S3. Frequency switching and signal output: Each time the radio frequency signal source and the local oscillator signal source receive a synchronous pulse, they switch and output frequencies according to the preset radio frequency frequency list and local oscillator frequency list respectively to generate a radio frequency signal and a local oscillator signal. S4. Processing of radio frequency signal and local oscillator signal: The transmitting mixer receives the radio frequency signal and the local oscillator signal, mixes and down-converts them to generate a transmitted signal and a reference signal respectively. The transmitted signal is sent to the transmitting antenna of the scanning frame, and the transmitted signal is input to the reference port of the vector network analyzer. S5. Processing of received signal: The receiving mixer receives the received signal captured by the receiving antenna on the mounting table from the transmitting antenna, performs down-conversion processing on the received signal and the local oscillator signal to generate a test signal, and inputs it to the test port of the vector network analyzer. S6. Data acquisition and analysis: The vector network analyzer synchronously acquires the reference signal and the test signal under the trigger of the synchronous pulse, performs analog-to-digital conversion, real-time filtering, and amplitude / phase analysis to generate test data. S7. Loop execution: Repeat steps S1 - S6, move the scanning frame to the next test point according to the preset motion path and distance trigger interval, and traverse all the frequency points in each frequency list to complete the automated test of multiple positions and multiple frequency points. S8. Result storage and output: The control computer summarizes the analysis data of the vector network analyzer, stores it and generates a test report to complete the entire test process.

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