A detection method and a detection system of a radar environment simulation system

Abstract

The application relates to the field of radio and communication technology, and discloses a detection method and a detection system of a radar environment simulation system. The detection method comprises the following steps: a scene simulator generates a radar target scene signal, a target model processor generates a baseband digital signal and a radar transponder S-mode target signal; a link converter mixes, detects and demodulates signals of a radar interface unit and external reference signals to obtain radio frequency signals; a signal control unit performs power distribution and path selection on the radio frequency signals, and injects the radio frequency signals into the detection system; the performance indicators of the radar environment simulation system are detected respectively; the actual measured values of the actually obtained performance indicators are compared with corresponding preset values, and the comparison results are compared with the performance indicator requirement values of the radar environment simulation system to determine whether the requirements are met. The application realizes accurate, quantifiable and verifiable detection of the performance indicators of the radar environment simulation system.

Description

Technical Field

[0001] This application relates to the fields of radio and communication technology, and in particular to a detection method and detection system for a radar environment simulation system. Background Technology

[0002] A radar environment simulation system is a crucial system for simulating complex radar signal scenarios. It primarily consists of a scenario generator, link converter, radar system, antenna system, and control computer, employing a software and hardware co-design approach. It can simultaneously simulate the required radar environment signals and generate reflection signals and antenna performance data for thousands of SSR (Secondary Surveillance Radar) or Mode S targets. The antenna system then injects the required radar signals from the actual scenario into the device under test. By simulating radar signals in aerial flight scenarios, the radar environment simulation system provides vital technical support for ground-based equipment in research and production, and also enables thorough verification and performance optimization of radar equipment.

[0003] In the field of airborne radar, radar environment simulation systems are indispensable core testing equipment. The accuracy of their performance indicators directly affects the reliability and safety of the entire radar system. Therefore, performance testing of the system itself is a crucial step in ensuring system quality. To ensure the authenticity, stability, and compliance of the system's output signal with technical specifications, specialized testing methods are required to verify and evaluate its complete operational chain.

[0004] Radar environment simulation systems are primarily used to simulate and generate target signals from secondary surveillance radars or Mode S. If key performance parameters such as the accuracy, resolution, and target detection probability of the output radar signals cannot be effectively traced and periodically corrected, systemic deviations will be introduced into equipment development, production, and subsequent use. Test data cannot be effectively guaranteed, ultimately affecting the overall quality and reliability of the equipment. Currently, the main challenge in testing this system is the lack of professional testing methods and systems. Summary of the Invention

[0005] To address the lack of detection methods and systems for radar environment simulation systems, this application provides a detection method and system for radar environment simulation systems. For the detection of parameters related to the radar environment simulation system, such as the frequency accuracy of the radar transponder's Mode S signal, the accuracy of the transmit power level, and the background noise, the method employs two approaches: recombining the signal flow between internal working circuits and constructing a detection sequence. This combined approach verifies and calibrates the performance parameters of the radar environment simulation system.

[0006] This application discloses a detection method for a radar environment simulation system, which includes: Disconnect the VR signal and CLK signal transmission channels between the signal synthesis unit of the scene generator and the radar interface unit of the link converter in the radar environment simulation system, so that the scene generator stops loading baseband digital signals to the link converter. The signal synthesis unit injects the radar transponder mode S target signal into the radar interface unit; the link converter mixes, detects and demodulates the signal from the radar interface unit with the external reference signal to obtain the radio frequency signal and sends it to the signal control unit of the link converter. The signal control unit performs power distribution and path selection for the radio frequency signal, and finally injects the radio frequency signal into the test instrument of the detection system through the Σ channel and Δ channel; The performance indicators of the radar environment simulation system are tested, including radio frequency accuracy, transmit power level accuracy, and background noise value. The actual measured values ​​of the performance indicators obtained by the test instruments are calculated with the corresponding preset values, and the calculation results are compared with the required performance indicators of the radar environment simulation system to determine whether the requirements are met.

[0007] Furthermore, when the performance indicator is radio frequency accuracy and the testing instrument is a frequency counter, the testing of the performance indicators of the radar environment simulation system includes: Connect the Σ channel of the signal control unit in the link converter to the input of the attenuator and connect the Δ channel of the signal control unit to the blocking load; or connect the Δ channel of the signal control unit in the link converter to the input of the attenuator and connect the Σ channel of the signal control unit to the blocking load. Connect the output of the attenuator to the input of the power divider, connect the first signal output of the power divider to the external reference signal input of the link converter, and connect the second signal output of the power divider to the signal input of the frequency counter. Set the frequency counter to pulse operation mode and trigger it with the rising edge of an external reference signal; set the first relevant parameters through the metrology calibration and testing software, which include the operating mode, pulse power, attenuation parameter, pulse width, and RF frequency; run the RF frequency accuracy detection subroutine in the metrology calibration and testing software, measure the frequency through the frequency counter, and obtain the measured frequency value; the actual measured values ​​of the performance indicators include the measured frequency value. The difference between the measured frequency value and the nominal frequency value is the frequency deviation value. By comparing the frequency deviation value with the performance index requirement value, it is determined whether the radar environment simulation system meets the requirements.

[0008] Furthermore, the step of determining whether the radar environment simulation system meets the requirements by comparing the frequency difference with the performance index requirements includes: If the frequency deviation value is less than or equal to the frequency performance index requirement value, the radar environment simulation system meets the requirements; the performance index requirement value includes the frequency performance index requirement value. If the frequency deviation value is greater than the required frequency performance index value, the radar environment simulation system does not meet the requirements.

[0009] Furthermore, when the performance indicator is the accuracy of the transmit power level, the testing instrument is a peak power analyzer, and the detection system also includes a power sensor, the detection of the performance indicators of the radar environment simulation system includes: Connect the Σ channel of the signal control unit in the link converter to the input of the attenuator and connect the Δ channel of the signal control unit to the blocking load; or connect the Δ channel of the signal control unit in the link converter to the input of the attenuator and connect the Σ channel of the signal control unit to the blocking load. Connect the output of the attenuator to the input of the power divider, connect the first signal output of the power divider to the external reference signal input of the link converter, and connect the second signal output of the power divider to the signal input of the peak power analyzer through a power sensor. Connect the power sensor to the calibration terminal of the peak power analyzer for calibration and zeroing; The second relevant parameters are set through the metrology calibration and testing software. The second relevant parameters include the working mode, attenuation parameter, pulse width, radio frequency and phase parameter. Run the transmit power level accuracy detection subroutine in the metrology calibration and testing software, measure the transmit power level using a peak power analyzer, and obtain the measured power level value; the actual measured values ​​of performance indicators include the measured power level value; Subtract the nominal power level from the measured calibrated power level, and then subtract the measured power level from the difference to obtain the power level error value. By comparing the error value of the power level with the required performance index value, it can be determined whether the radar environment simulation system meets the requirements.

[0010] Furthermore, the step of determining whether the radar environment simulation system meets the requirements by comparing the power level error value with the performance index requirement value includes: If the error value of the power level is less than or equal to the required value of the power level performance index, then the radar environment simulation system meets the requirements; the required value of the performance index includes the required value of the power level performance index. If the error value of the power level is greater than the required value of the power level performance index, then the radar environment simulation system does not meet the requirements.

[0011] Furthermore, when the performance indicator is the noise floor and the testing instrument is a spectrum analyzer, the testing of the performance indicators of the radar environment simulation system includes: The third relevant parameters are set through metrological calibration and testing software. The third relevant parameters include Σ mode, pulse power, attenuation parameter, pulse width, radio frequency and phase. Connect the Σ channel of the signal control unit in the link converter to the input of the attenuator and connect the Δ channel of the signal control unit to the blocking load; or connect the Δ channel of the signal control unit in the link converter to the input of the attenuator and connect the Σ channel of the signal control unit to the blocking load. Connect the output of the attenuator to the input of the power divider, connect the first signal output of the power divider to the external reference signal input of the link converter, and connect the second signal output of the power divider to the signal input of the spectrum analyzer through a power sensor. Run the background noise detection subroutine in the metrology calibration and testing software, and measure the background noise using a spectrum analyzer to obtain the measured background noise value; the actual measured values ​​of performance indicators include the measured background noise value; By comparing the measured background noise value with the performance index requirements, it can be determined whether the radar environment simulation system meets the requirements.

[0012] Furthermore, the step of determining whether the radar environment simulation system meets the requirements by comparing the measured background noise value with the performance index requirement value includes: If the measured value of the background noise is less than or equal to the required value of the background noise performance index, then the radar environment simulation system meets the requirements; the required value of the performance index includes the required value of the background noise performance index. If the measured value of the background noise is greater than the required value of the background noise performance index, then the radar environment simulation system does not meet the requirements.

[0013] Furthermore, it also includes: The measured values ​​of the actual performance indicators obtained by the testing instrument and the results of whether the radar environment simulation system meets the requirements are fed back to the computer for data acquisition, processing, display and storage by the metrology calibration and testing software.

[0014] This application also discloses a detection system for a radar environment simulation system, implementing the detection method for the radar environment simulation system described above. The system includes: a computer, testing instruments, an attenuator, a power divider, and a blocking load. The computer is connected to the scene generator and link converter of the radar environment simulation system, respectively. The computer is also connected to the testing instruments. The attenuator and blocking load are connected to the Σ channel and Δ channel of the link converter, respectively. The attenuator is connected to the link converter and the testing instruments via the power divider. The testing instruments include a power counter, a peak power analyzer, and a spectrum analyzer.

[0015] Furthermore, in the link converter, the Σ channel of the signal control unit is connected to the input terminal of the attenuator, and the Δ channel of the signal control unit is connected to the blocking load; or in the link converter, the Δ channel of the signal control unit is connected to the input terminal of the attenuator, and the Σ channel of the signal control unit is connected to the blocking load. The output terminal of the attenuator is connected to the input terminal of the power divider, the first signal output terminal of the power divider is connected to the external reference signal input terminal of the link converter, and the second signal output terminal of the power divider is connected to the signal input terminal of the test instrument.

[0016] Due to the adoption of the above technical solution, this application has the following advantages: 1. This application can effectively overcome the technical bottlenecks in the detection aspect of existing radar environment simulation systems and improve the overall measurability and reliability of the system.

[0017] 2. This application can significantly improve the efficiency of such systems or testing equipment, reduce research and production costs, and greatly improve the timeliness of metrological calibration.

[0018] 3. This application achieves automated detection and metrological calibration by reconstructing the detection chain and employing computer and instrument control technology. It can accurately detect and calibrate key performance indicators of radar environment simulation systems, including RF frequency accuracy, transmit power level accuracy, and background noise. This method overcomes the technical bottlenecks of existing systems, such as inability to perform autonomous detection, difficulty in metrological calibration, and lack of metrological traceability. While improving detection reliability and accuracy, it significantly reduces metrological calibration costs and timelines. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be introduced below. Obviously, the drawings described below are only the embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings. The drawings are described as follows: Figure 1 This is a connection block diagram of the scene generator and link converter in the radar environment simulation system of this application embodiment; Figure 2 This is a block diagram illustrating the working principle of a radar environment simulation system and its detection method according to an embodiment of this application. Figure 3 This is a block diagram illustrating the detection principle of a radar environment simulation system according to an embodiment of this application; Figure 4 This is a block diagram illustrating the principle of radio frequency accuracy detection in a radar environment simulation system according to an embodiment of this application. Figure 5This is a block diagram illustrating the transmission power level accuracy detection principle of a radar environment simulation system according to an embodiment of this application. Figure 6 This is a block diagram illustrating the principle of background noise detection in a radar environment simulation system according to an embodiment of this application. Detailed Implementation

[0020] The present application will be further described in conjunction with the accompanying drawings and embodiments. The described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by those skilled in the art should fall within the protection scope of the embodiments of the present application.

[0021] See Figure 1 and Figure 2 This application provides an embodiment of a radar environment simulation system detection method, which includes: Disconnect the VR signal and CLK signal transmission channels between the signal synthesis unit of the scene generator and the radar interface unit of the link converter in the radar environment simulation system, so that the scene generator stops loading baseband digital signals to the link converter. The signal synthesis unit injects the radar transponder mode S target signal into the radar interface unit; the link converter mixes, detects and demodulates the signal from the radar interface unit with the external reference signal to obtain the radio frequency signal and sends it to the signal control unit of the link converter. The signal control unit performs power distribution and path selection for the radio frequency signal, and finally injects the radio frequency signal into the test instrument of the detection system through the Σ channel and Δ channel; The performance indicators of the radar environment simulation system are tested, including radio frequency accuracy, transmit power level accuracy, and background noise. The actual measured values ​​of the performance indicators obtained by the test instruments are compared with the corresponding preset values, and the calculation results are compared with the required performance indicators of the radar environment simulation system to determine whether the requirements are met.

[0022] Figure 1 In the process, the VL signal terminal of the signal synthesis unit inputs the radar transponder S-mode target signal to the VL signal terminal of the radar interface unit.

[0023] Optionally, when the performance indicator is radio frequency accuracy and the testing instrument is a frequency counter, the testing of the performance indicators of the radar environment simulation system includes: Connect the Σ channel of the signal control unit in the link converter to the input of the attenuator and connect the Δ channel of the signal control unit to the blocking load; or connect the Δ channel of the signal control unit in the link converter to the input of the attenuator and connect the Σ channel of the signal control unit to the blocking load. Connect the output of the attenuator to the input of the power divider, connect the first signal output of the power divider to the external reference signal input of the link converter, and connect the second signal output of the power divider to the signal input of the frequency counter. Set the frequency counter to pulse operation mode and trigger it with the rising edge of an external reference signal; set the first relevant parameters through the metrology calibration and testing software, which include the operating mode, pulse power, attenuation parameter, pulse width, and RF frequency; run the RF frequency accuracy detection subroutine in the metrology calibration and testing software, measure the frequency through the frequency counter, and obtain the measured frequency value; the actual measured values ​​of the performance indicators include the measured frequency value. The difference between the measured frequency value and the nominal frequency value is the frequency deviation. By comparing the frequency deviation value with the performance index requirement value, it is determined whether the radar environment simulation system meets the requirements.

[0024] Optionally, the metrology calibration and testing software is designed in parallel using both Visual C# and CVI development platforms. The software integrates the functions of detection sequence, error calculation, and result judgment. It uses the standard communication protocol and control commands between the system equipment and the test instrument to build the detection sequence and driver for the detection software for radio frequency accuracy, transmit power level accuracy, and background noise.

[0025] Optionally, the step of determining whether the radar environment simulation system meets the requirements by comparing the frequency deviation value with the performance index requirement value includes: If the frequency deviation value is less than or equal to the frequency performance index requirement value, the radar environment simulation system meets the requirements; the performance index requirement value includes the frequency performance index requirement value. If the frequency deviation value is greater than the required frequency performance index value, the radar environment simulation system does not meet the requirements.

[0026] Optionally, when the performance indicator is the accuracy of the transmit power level, the testing instrument is a peak power analyzer, and the detection system also includes a power sensor, the detection of the performance indicators of the radar environment simulation system includes: Connect the Σ channel of the signal control unit in the link converter to the input of the attenuator and connect the Δ channel of the signal control unit to the blocking load; or connect the Δ channel of the signal control unit in the link converter to the input of the attenuator and connect the Σ channel of the signal control unit to the blocking load. Connect the output of the attenuator to the input of the power divider, connect the first signal output of the power divider to the external reference signal input of the link converter, and connect the second signal output of the power divider to the signal input of the peak power analyzer through a power sensor. Connect the power sensor to the calibration terminal of the peak power analyzer for calibration and zeroing; The second relevant parameters are set through the metrology calibration and testing software. The second relevant parameters include the working mode, attenuation parameter, pulse width, radio frequency and phase parameter. Run the transmit power level accuracy detection subroutine in the metrology calibration and testing software, measure the transmit power level using a peak power analyzer, and obtain the measured power level value; the actual measured values ​​of performance indicators include the measured power level value; The error of the power level is obtained by subtracting the nominal power level from the measured power level, and then subtracting the measured power level from the difference. By comparing the error value of the power level with the required performance index value, it can be determined whether the radar environment simulation system meets the requirements.

[0027] Optionally, the detection method for the radar environment simulation system, wherein determining whether the radar environment simulation system meets the requirements by comparing the power level error value with the performance index requirement value, includes: If the error value of the power level is less than or equal to the required value of the power level performance index, then the radar environment simulation system meets the requirements; the required value includes the required value of the power level performance index. If the error value of the power level is greater than the required value of the power level performance index, then the radar environment simulation system does not meet the requirements.

[0028] Optionally, when the performance indicator is the noise floor and the testing instrument is a spectrum analyzer, the testing of the performance indicators of the radar environment simulation system includes: The third relevant parameters are set through metrological calibration and testing software. The third relevant parameters include Σ mode, pulse power, attenuation parameter, pulse width, radio frequency and phase. Connect the Σ channel of the signal control unit in the link converter to the input of the attenuator and connect the Δ channel of the signal control unit to the blocking load; or connect the Δ channel of the signal control unit in the link converter to the input of the attenuator and connect the Σ channel of the signal control unit to the blocking load. Connect the output of the attenuator to the input of the power divider, connect the first signal output of the power divider to the external reference signal input of the link converter, and connect the second signal output of the power divider to the signal input of the spectrum analyzer through a power sensor. Run the background noise detection subroutine in the metrology calibration and testing software, and measure the background noise using a spectrum analyzer to obtain the measured background noise value; the actual measured values ​​of performance indicators include the measured background noise value; By comparing the measured background noise value with the performance index requirements, it can be determined whether the radar environment simulation system meets the requirements.

[0029] Optionally, the step of determining whether the radar environment simulation system meets the requirements by comparing the measured background noise value with the performance index requirement value includes: If the measured value of the background noise is less than or equal to the required value of the background noise performance index, then the radar environment simulation system meets the requirements; the required value of the performance index includes the required value of the background noise performance index. If the measured value of the background noise is greater than the required value of the background noise performance index, then the radar environment simulation system does not meet the requirements.

[0030] Optionally, it also includes: The actual measured values ​​of the performance indicators obtained by the testing instrument and the results of whether the radar environment simulation system meets the requirements are fed back to the computer for data acquisition, processing, display and storage by the metrology calibration and testing software.

[0031] See Figures 3 to 6 This application also provides an embodiment of a detection system for a radar environment simulation system, implementing the detection method for the radar environment simulation system described in the above embodiment, comprising: a computer, testing instruments, an attenuator, a power divider, and a blocking load; the computer is connected to the scene generator and the link converter of the radar environment simulation system respectively; the computer is also connected to the testing instruments; the attenuator and the blocking load are connected to the Σ channel and Δ channel of the link converter respectively; the attenuator is connected to the link converter and the testing instruments respectively through the power divider; the testing instruments include a power counter, a peak power analyzer, and a spectrum analyzer.

[0032] Optionally, the computer is connected to the scene generator and link converter of the radar environment simulation system via a universal interface bus (IEEE-488 bus).

[0033] Optionally, the Σ channel of the signal control unit in the link converter is connected to the input terminal of the attenuator, and the Δ channel of the signal control unit is connected to the blocking load; or the Δ channel of the signal control unit in the link converter is connected to the input terminal of the attenuator, and the Σ channel of the signal control unit is connected to the blocking load. The output terminal of the attenuator is connected to the input terminal of the power divider, the first signal output terminal of the power divider is connected to the external reference signal input terminal of the link converter, and the second signal output terminal of the power divider is connected to the signal input terminal of the test instrument.

[0034] For ease of understanding, this application provides a more specific embodiment: This invention addresses the lack of detection and calibration methods for radar environment simulation systems by employing two methods: reorganizing the signal flow within the internal operating circuits and reconstructing the detection sequence, implemented concurrently. The detection sequence is integrated into the calibration software, which can detect frequency accuracy, power level accuracy, and background noise, as well as calculate errors and determine results.

[0035] 1. Internal circuit signal reconstruction and neologism detection sequence The signal transmission between the signal synthesis unit of the radar environment simulation system scene generator and the VR and CLK signals of the link converter radar interface unit is disconnected. The RF signal from the link converter's signal control unit is injected into an external power divider, which splits the signal in two. One signal serves as the external reference signal for the link converter, and this signal is mixed, detected, and demodulated with the signal from the link converter's radar interface unit. Subsequently, the RF signals are injected into the detection system through the Σ and Δ channels respectively. Test instruments, including a frequency counter, peak power analyzer, and spectrum analyzer, are used to test and calibrate the frequency accuracy, power level accuracy, and background noise performance parameters of the radar environment simulation system.

[0036] 2. Human-computer interaction calibration software for computer-controlled testing At the metrology calibration and testing software and control level, a communication link between system equipment and testing instruments is established through computer general interface bus technology. Based on standard communication protocols and control commands for equipment and testing instruments, a set of metrology calibration and testing software was custom-developed for the radar environment simulation system. This software integrates subroutines for detecting RF frequency accuracy, transmit power level, and background noise. It can dynamically configure parameters of system equipment and testing instruments, such as operating frequency, power level, and pulse width. Simultaneously, the metrology calibration and testing software supports fully automated testing, data acquisition, error calculation, result evaluation, result display, and report generation. Through efficient human-computer interaction technology, this software provides support for the verification and metrology calibration of the radar environment simulation system's performance indicators.

[0037] This invention relates to three detection techniques, the detailed technical solutions of which are described below.

[0038] 1. Radio Frequency Accuracy Testing Method The methods for detecting the radio frequency accuracy of radar environment simulation systems include the Σ method and the Δ method, as detailed below: 1) Detection of Σ-mode radio frequency accuracy The testing steps are as follows: a) Connect the signal output terminal of the radar environment simulation system link converter signal control unit Σ to the signal input terminal of the attenuator, and connect the signal output terminal of the attenuator to the signal input terminal of the power divider.

[0039] b) The first signal output terminal of the power divider is connected to the external reference signal input terminal of the link converter of the radar environment simulation system, and the second signal output terminal of the power divider is connected to the signal input terminal of the frequency counter.

[0040] c) Connect the Δ channel signal output of the radar environment simulation system link converter signal control unit to the blocking load input.

[0041] d) Run the metrology calibration and testing software, set the operating mode to Σ mode, the pulse trigger mode to external reference signal, the power mode to pulse power mode, the parameter to 0.0dBm, the attenuation parameter to external attenuation, the parameter to 10dB, the pulse width to 3us, and the RF frequency... The value is set to 1030MHz.

[0042] e) The frequency counter is set to pulse operation mode, the gate time is set to less than 2s, and the trigger level is set to rising edge.

[0043] f) Run the radio frequency accuracy detection subroutine in the metrology calibration and testing software.

[0044] g) Measure the frequency using a frequency counter and read the measured frequency. value.

[0045] h) Stop running the RF frequency accuracy detection subroutine and restore the factory default parameter settings of the radar environment simulation system and frequency counter.

[0046] i) The method for calculating the deviation of the Σ-mode radio frequency in the radar environment simulation system is to use the frequency measured by the frequency counter. Measured value minus the system set frequency The difference between the nominal value and the obtained value should be the frequency deviation.

[0047] 2) Detection of RF frequency accuracy using the delta method The testing steps are as follows: a) Connect the signal output terminal of the radar environment simulation system link converter signal control unit Δ to the signal input terminal of the attenuator, and connect the signal output terminal of the attenuator to the signal input terminal of the power divider.

[0048] b) The first signal output terminal of the power divider is connected to the external reference signal input terminal of the link converter of the radar environment simulation system, and the second signal output terminal of the power divider is connected to the signal input terminal of the frequency counter.

[0049] c) Connect the Σ-channel signal output of the radar environment simulation system link converter signal control unit to the blocking load input.

[0050] d) Run the metrology calibration and testing software, set the operating mode to Δ mode, the pulse trigger mode to external reference signal, the power mode to pulse power mode, the parameter to -5.0dBm, the attenuation parameter to external attenuation, the parameter to 5dB, the pulse width to 3us, and the RF frequency... The value is set to 1090MHz.

[0051] e) The frequency counter is set to pulse operation mode, the gate time is set to less than 2s, and the trigger level is set to rising edge.

[0052] f) Run the radio frequency accuracy detection subroutine in the metrology calibration and testing software.

[0053] g) Measure the frequency using a frequency counter and read the measured frequency. Measured value.

[0054] h) Stop running the RF frequency accuracy detection subroutine and restore the factory default parameter settings of the radar environment simulation system and frequency counter.

[0055] i) The method for calculating the deviation of the Δ-mode radio frequency in the radar environment simulation system is to use the frequency measured by the frequency counter... Measured value minus the system set frequency The difference between the nominal value and the obtained value should be the frequency deviation.

[0056] 2. Detection of transmit power level accuracy The methods for detecting the accuracy of transmit power level in radar environment simulation systems include the Σ method and the Δ method, as detailed below: 1) Detection of accuracy of transmit power level in Σ mode The testing steps are as follows: a) Connect the signal output terminal of the radar environment simulation system link converter signal control unit Σ to the signal input terminal of the attenuator, and connect the signal output terminal of the attenuator to the signal input terminal of the power divider.

[0057] b) The first signal output terminal of the power divider is connected to the external reference signal input terminal of the link converter of the radar environment simulation system. After the power sensor calibration is completed, the second signal output terminal of the power divider is connected to the signal input terminal of the power sensor.

[0058] c) Connect the Δ channel signal output of the radar environment simulation system link converter signal control unit to the blocking load input.

[0059] d) First, connect the power sensor to the calibration signal terminal of the peak power analyzer for calibration. After the calibration is completed and the sensor is zeroed, remove it from the peak power analyzer and connect it to the second signal output terminal of the power divider.

[0060] e) Run the metrology calibration and testing software, set the working mode to Σ mode, the pulse trigger mode to external reference signal, the attenuation to external attenuator, the parameter to 10dB, the pulse width to 3us, the RF frequency to 1030MHz, the phase "DDS Phase" parameter to 180deg, and the pulse power level calibration value to 0.0dBm.

[0061] f) The input channel of the peak power analyzer is set to channel one, the measurement mode is pulse mode, the frequency is set to 1030MHz, the marker is set to average, the vertical scale is set to 2dB / div, the time base is set to 200ns, and the level is set to -3dBm.

[0062] g) Run the transmit power level accuracy detection subroutine in the metrology calibration and testing software.

[0063] h) Measure the pulse power level calibration value using a peak power analyzer and read the measured power level. Measured value.

[0064] i) Pause the execution of the transmit power level accuracy detection subroutine and set the pulse power level of the radar environment simulation system. The nominal value is +5dBm.

[0065] j) Run the transmit power level accuracy detection subroutine again, and use a peak power analyzer to measure the pulse power level. Measure the value and read the measured power level. Measured value.

[0066] k) Stop running the transmit power level accuracy detection subroutine and restore the factory default parameter settings of the radar environment simulation system.

[0067] l) The error calculation method for the Σ mode transmit power level of the radar environment simulation system is to set the pulse power level of the radar environment simulation system. Calibration by subtracting the pulse power level measured by the peak power analyzer from the nominal value. The measured values ​​are then subtracted from the pulse power level measured by the peak power analyzer. The measured values ​​indicate that the total difference should be the error in the transmit power level.

[0068] 2) Detection of accuracy of transmit power level in Δ mode The testing steps are as follows: a) Connect the signal output terminal of the radar environment simulation system link converter signal control unit Δ to the signal input terminal of the attenuator, and connect the signal output terminal of the attenuator to the signal input terminal of the power divider.

[0069] b) The first signal output terminal of the power divider is connected to the external reference signal input terminal of the link converter of the radar environment simulation system, and the second signal output terminal of the power divider is connected to the signal input terminal of the power sensor.

[0070] c) Connect the Σ-channel signal output of the radar environment simulation system link converter signal control unit to the blocking load input.

[0071] d) Set the operating mode to Δ mode, the pulse trigger mode to external reference signal, the attenuation to external attenuator, the parameter to 10dB, the pulse width to 3us, the RF frequency to 1090MHz, the phase "DDSPhase" parameter to 180deg, and the pulse power level calibration value to 0.0dBm.

[0072] e) The input channel of the peak power analyzer is set to channel one, the measurement mode is pulse mode, the frequency is set to 1090MHz, the marker is set to average, the vertical scale is set to 2dB / div, the time base is set to 200ns, and the level is set to -3dBm.

[0073] f) Run the transmit power level accuracy detection subroutine in the metrology calibration and testing software.

[0074] g) Measure the pulse power level calibration value using a peak power analyzer and read the measured power level. Measured value.

[0075] h) Pause the execution of the transmit power level accuracy detection subroutine and set the pulse power level of the radar environment simulation system. The nominal value is -10dBm.

[0076] i) Run the transmit power level accuracy detection subroutine again, and use a peak power analyzer to measure the pulse power level. Measure the value and read the measured power level. Measured value.

[0077] j) Stop running the transmit power level accuracy detection subroutine and restore the factory default parameter settings of the radar environment simulation system.

[0078] k) The error calculation method for the Δ mode transmit power level of the radar environment simulation system is to set the pulse power level of the radar environment simulation system. Calibration by subtracting the pulse power level measured by the peak power analyzer from the nominal value. The measured values ​​are then subtracted from the pulse power level measured by the peak power analyzer. The measured values ​​indicate that the total difference should be the error in the transmit power level.

[0079] 3. Detection of background noise The steps for detecting background noise in a radar environment simulation system are as follows: a) Connect the signal output terminal of the radar environment simulation system link converter signal control unit Σ to the signal input terminal of the attenuator, and connect the signal output terminal of the attenuator to the signal input terminal of the power divider.

[0080] b) The first signal output terminal of the power divider is connected to the external reference signal input terminal of the link converter of the radar environment simulation system, and the second signal output terminal of the power divider is connected to the radio frequency signal input terminal of the spectrum analyzer.

[0081] c) Connect the Δ channel signal output of the radar environment simulation system link converter signal control unit to the blocking load input.

[0082] d) Run the metrology calibration and testing software, set the operating mode to Σ mode, the pulse trigger mode to external reference signal, the power mode to pulse power mode, the parameter to 0.0dBm, the attenuation to external attenuator, the parameter to 10dB, the pulse width to 3us, the RF frequency to 1030MHz, the phase "DDS Phase" parameter to 180deg, and the pulse power level to... The value is set to 0.0 dBm.

[0083] e) Run the background noise detection subroutine in the metrology calibration and testing software.

[0084] f) Measure the background noise using a spectrum analyzer and read the measured background noise. Measured value.

[0085] g) Stop running the background noise detection subroutine and restore the factory default parameter settings of the radar environment simulation system and spectrum analyzer.

[0086] h) The measurement results of the background noise of the radar environment simulation system are obtained by comparison, which compares the measured value of the background noise measured by the spectrum analyzer with the performance index requirement value.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and not to limit them. Although this application has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this application. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this application should be covered within the protection scope of the claims of this application.

Claims

1. A detection method for a radar environment simulation system, characterized in that, include: The computer sends working instructions to the scene generator in the radar environment simulation system, so that the scene simulator in the scene generator generates various radar target scene signals, and generates baseband digital signals and radar transponder mode S target signals through the target model processor. Disconnect the VR signal and CLK signal transmission channels between the signal synthesis unit of the scene generator and the radar interface unit of the link converter in the radar environment simulation system to terminate the loading of baseband digital signals by the scene generator onto the link converter. The signal synthesis unit injects the radar transponder mode S target signal into the radar interface unit; the link converter mixes, detects and demodulates the signal from the radar interface unit with the external reference signal to obtain the radio frequency signal and sends it to the signal control unit of the link converter. The signal control unit performs power distribution and path selection for the radio frequency signal, and finally injects the radio frequency signal into the test instrument of the detection system through the Σ channel and Δ channel; The performance indicators of the radar environment simulation system were tested, including radio frequency accuracy, transmit power level accuracy, and background noise. The actual measured values ​​of the performance indicators obtained by the testing instrument are calculated and compared with the corresponding preset values. The calculation results are then compared with the performance indicator requirements of the radar environment simulation system to determine whether the requirements are met.

2. The detection method of the radar environment simulation system according to claim 1, characterized in that, When the performance indicator is radio frequency accuracy and the testing instrument is a frequency counter, the performance indicator testing of the radar environment simulation system includes: Connect the Σ channel of the signal control unit in the link converter to the input of the attenuator and connect the Δ channel of the signal control unit to the blocking load; or connect the Δ channel of the signal control unit in the link converter to the input of the attenuator and connect the Σ channel of the signal control unit to the blocking load. Connect the output of the attenuator to the input of the power divider, connect the first signal output of the power divider to the external reference signal input of the link converter, and connect the second signal output of the power divider to the signal input of the frequency counter. Set the frequency counter to pulse operation mode and trigger it with the rising edge of an external reference signal; set the first relevant parameters through the metrology calibration and testing software, which include the operating mode, pulse power, attenuation parameter, pulse width, and RF frequency; run the RF frequency accuracy detection subroutine in the metrology calibration and testing software, measure the frequency through the frequency counter, and obtain the measured frequency value; the actual measured values ​​of the performance indicators include the measured frequency value. The difference between the measured frequency value and the nominal frequency value is the frequency deviation value. By comparing the frequency deviation value with the performance index requirement value, it is determined whether the radar environment simulation system meets the requirements.

3. The detection method of the radar environment simulation system according to claim 2, characterized in that, The step of determining whether the radar environment simulation system meets the requirements by comparing the frequency deviation value with the performance index requirement value includes: If the frequency deviation value is less than or equal to the frequency performance index requirement value, the radar environment simulation system meets the requirements; the performance index requirement value includes the frequency performance index requirement value. If the frequency deviation value is greater than the required frequency performance index value, the radar environment simulation system does not meet the requirements.

4. The detection method of the radar environment simulation system according to claim 1, characterized in that, When the performance indicator is the accuracy of the transmit power level, the testing instrument is a peak power analyzer, and the detection system also includes a power sensor, the detection of the performance indicators of the radar environment simulation system includes: Connect the Σ channel of the signal control unit in the link converter to the input of the attenuator and connect the Δ channel of the signal control unit to the blocking load; or connect the Δ channel of the signal control unit in the link converter to the input of the attenuator and connect the Σ channel of the signal control unit to the blocking load. Connect the output of the attenuator to the input of the power divider, connect the first signal output of the power divider to the external reference signal input of the link converter, and connect the second signal output of the power divider to the signal input of the peak power analyzer through a power sensor. Connect the power sensor to the calibration terminal of the peak power analyzer for calibration and zeroing; The second relevant parameters are set through the metrology calibration and testing software. The second relevant parameters include the working mode, attenuation parameter, pulse width, radio frequency and phase parameter. Run the transmit power level accuracy detection subroutine in the metrology calibration and testing software, measure the transmit power level using a peak power analyzer, and obtain the measured power level value; the actual measured values ​​of performance indicators include the measured power level value; Subtract the nominal power level value from the measured power level value, and then subtract the measured power level value from the difference to obtain the power level error value. By comparing the error value of the power level with the required performance index value, it can be determined whether the radar environment simulation system meets the requirements.

5. The detection method of the radar environment simulation system according to claim 4, characterized in that, The step of comparing the power level error value with the performance index requirement value to determine whether the radar environment simulation system meets the requirements includes: If the error value of the power level is less than or equal to the required value of the power level performance index, then the radar environment simulation system meets the requirements; the required value of the performance index includes the required value of the power level performance index. If the error value of the power level is greater than the required value of the power level performance index, then the radar environment simulation system does not meet the requirements.

6. The detection method of the radar environment simulation system according to claim 1, characterized in that, When the performance indicator is the noise floor and the testing instrument is a spectrum analyzer, the performance indicator testing of the radar environment simulation system includes: The third relevant parameters are set through metrological calibration and testing software. The third relevant parameters include Σ mode, pulse power, attenuation parameter, pulse width, radio frequency and phase. Connect the Σ channel of the signal control unit in the link converter to the input of the attenuator and connect the Δ channel of the signal control unit to the blocking load; or connect the Δ channel of the signal control unit in the link converter to the input of the attenuator and connect the Σ channel of the signal control unit to the blocking load. Connect the output of the attenuator to the input of the power divider, connect the first signal output of the power divider to the external reference signal input of the link converter, and connect the second signal output of the power divider to the signal input of the spectrum analyzer through a power sensor. Run the background noise detection subroutine in the metrology calibration and testing software, and measure the background noise using a spectrum analyzer to obtain the measured background noise value; the actual measured values ​​of performance indicators include the measured background noise value; By comparing the measured background noise value with the performance index requirements, it can be determined whether the radar environment simulation system meets the requirements.

7. The detection method of the radar environment simulation system according to claim 6, characterized in that, The step of comparing the measured background noise value with the performance index requirement to determine whether the radar environment simulation system meets the requirements includes: If the measured value of the background noise is less than or equal to the required value of the background noise performance index, then the radar environment simulation system meets the requirements; the required value includes the required value of the background noise performance index. If the measured value of the background noise is greater than the required value of the background noise performance index, then the radar environment simulation system does not meet the requirements.

8. The detection method of the radar environment simulation system according to claim 1, characterized in that, Also includes: The measured values ​​of the actual performance indicators obtained by the testing instrument and the results of whether the radar environment simulation system meets the requirements are fed back to the computer for data acquisition, processing, display and storage by the metrology calibration and testing software.

9. A detection system for a radar environment simulation system, implementing the detection method for the radar environment simulation system according to any one of claims 1-8, characterized in that, include: The system includes a computer, testing instruments, an attenuator, a power divider, and a blocking load. The computer is connected to the scene generator and the link converter of the radar environment simulation system. The computer is also connected to the testing instruments. The attenuator and the blocking load are connected to the Σ channel and Δ channel of the link converter, respectively. The attenuator is connected to the link converter and the testing instruments via the power divider. The testing instruments include a frequency counter, a peak power analyzer, and a spectrum analyzer.

10. The detection system of the radar environment simulation system according to claim 9, characterized in that, The Σ channel of the signal control unit in the link converter is connected to the input terminal of the attenuator, and the Δ channel of the signal control unit is connected to the blocking load; or the Δ channel of the signal control unit in the link converter is connected to the input terminal of the attenuator, and the Σ channel of the signal control unit is connected to the blocking load. The output terminal of the attenuator is connected to the input terminal of the power divider, the first signal output terminal of the power divider is connected to the external reference signal input terminal of the link converter, and the second signal output terminal of the power divider is connected to the signal input terminal of the test instrument.

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