Radar simulator calibration device distance change rate parameter verification method and device

Abstract

The invention provides a method and a device for verifying distance change rate parameters of a radar simulator calibration device, a synchronizing signal of a transmitting part of the calibration device is connected to an input port of a power divider, and an output port of the power divider is respectively connected with a trigger input port of a vector signal generator and a CH2 port of a digital oscilloscope; a radio frequency output port of the vector signal generator is connected with an input port of the power divider, an output port of the power divider is respectively connected with a radio frequency input port of a receiving part of the calibration device and a CH1 port of the digital oscilloscope, and the control computer is connected with the vector signal generator to control a loading waveform. According to the invention, calibration device parameters are traced to a general standard instrument; the distance change correlation between the echo signal and the calibration device signal is ensured; meanwhile, a digital oscilloscope is used for measuring the distance variation during verification, and the precision can reach nanoseconds and is higher than the index of the distance change rate of the calibration device, so that the parameters of the calibration device can be traced to a general standard instrument.

Description

Technical Field

[0001] This invention relates to the field of radar testing, and in particular to a method and apparatus for verifying calibration parameters of a radar simulator. Background Technology

[0002] A radar simulator calibration device is used to calibrate a radar target simulator. It consists of two parts: a transmitter and a receiver. The transmitter sends a simulated radar signal to the simulator. After the radar target simulator receives the signal, it returns a target echo signal to the calibration device. The calibration device compares the echo signal with the signal from the transmitter and with the target parameters set in the simulator to determine if the target parameters meet the technical requirements. The target distance change rate is a crucial parameter for the simulator, and the accuracy of the calibration value obtained by the calibration device is a significant issue. This invention primarily addresses the parameter verification and traceability problem of the distance change rate measurement in the calibration device.

[0003] Currently, the verification method based on general-purpose instruments involves using a high-accuracy radar target simulator to observe the consistency between the rate of change of target distance in the simulator and the rate of change of distance in the calibration device, in order to check whether the measurement results of the calibration device are correct.

[0004] However, the current solution has the following drawbacks:

[0005] Disadvantage 1: The measurement accuracy depends on the accuracy of the simulator. The accuracy of the calibration device is generally higher than that of the simulator. This method can generally only verify whether the calibration device is functioning properly, but cannot determine the actual accuracy of the calibration device.

[0006] Disadvantage 2: Radar target simulators are specialized testing equipment, not general-purpose instruments, and their technical specifications generally cannot be traced back to national standard devices.

[0007] Disadvantage 3: In general calibration processes, when using a digital oscilloscope, the acquisition time is limited by the oscilloscope's internal memory. Sampling rate × acquisition time = acquisition memory. Assuming a standard internal memory of 10ms, if a sampling rate of 1.25Gs / s is used, the calculated longest acquisition time is... Generally, the distance change time in a simulator is much longer than 8ms, so the general measurement function cannot complete the measurement of the distance change rate parameter. Summary of the Invention

[0008] To overcome the shortcomings of the prior art, the present invention provides a method and apparatus for verifying the range change rate parameter of a radar simulator calibration device.

[0009] The technical solution adopted by this invention to solve its technical problem is:

[0010] A method for verifying the range change rate parameter of a radar simulator calibration device, specifically including the following steps:

[0011] First step: Connect the synchronization signal of the transmitting section of the calibration device to the input port of the power divider. Connect the output port of the power divider to the trigger input port of the vector signal generator and the CH2 port of the digital oscilloscope. Connect the RF output port of the vector signal generator to the input port of the power divider. Connect the output port of the power divider to the RF input port of the receiving section of the calibration device and the CH1 port of the digital oscilloscope.

[0012] Second step: Turn on the radio frequency signal and synchronization signal transmission functions of the calibration device, and synchronize the pulses of the synchronization signal and the radio frequency signal;

[0013] Third step: Use the control computer to control the vector signal generator to load the waveform;

[0014] Step 4: Use the Fast Frame segmented storage function of a digital oscilloscope to simultaneously acquire and store the echo signal and the excitation signal;

[0015] Step 5: Set the trigger level of the digital oscilloscope to be triggered by both the excitation and echo signals simultaneously. To save memory space, only the absolute occurrence time of the first pulse needs to be acquired. Set the hold time of the trigger stop to be greater than the time interval between the echo signal and the excitation signal, ensuring that the echo signal and the excitation signal can be acquired only once within one acquisition frame.

[0016] Step 6: Obtain the absolute occurrence time T of each frame on a digital oscilloscope. n ;

[0017] Step 7: Measure the relative time value t of the echo signal within each frame with respect to the first radar analog signal pulse. n Calculate the standard value V1 of the distance change rate at each time point;

[0018] Step 8: Activate the distance change rate parameter calibration function of the calibration device. This function is used to automatically calibrate the distance change rate parameter of the target simulation, thereby obtaining the distance change rate measurement result and the calibration distance change rate of the receiving part of the calibration device, and obtaining the parameter distance change rate V2.

[0019] Step 9: Calculate the distance change rate error Δ of the calibration device, where Δ = V2 - V1;

[0020] Step 10: Determine whether the distance change rate error Δ meets the technical requirements for distance change rate. The requirements are: Δ≤ Maximum permissible error;

[0021] Step 11: During the actual distance change rate process of the calibration device, subtract the distance change rate error value Δ from the calibration result.

[0022] In the third step, the relationship between the waveform and the signal of the transmitting part is as follows:

[0023]

[0024] Where: t n Let T1 be the relative time value of the echo signal emitted by the vector signal generator relative to the first simulated radar signal pulse, V be the distance change rate simulated by the vector signal generator, C be the speed of light, and T1 be the absolute time value of the first simulated radar signal pulse. n This represents the absolute time value of the nth simulated radar signal pulse.

[0025] In the seventh step, the standard value V1 of the distance change rate at each time point is:

[0026]

[0027] A distance change rate parameter verification device for a radar simulator calibration apparatus includes a vector signal generator, a digital oscilloscope, a power divider, and a control computer. The synchronization signal of the transmitting part of the calibration apparatus is connected to the input port of the power divider. The output port of the power divider is connected to the trigger input port of the vector signal generator and the CH2 port of the digital oscilloscope. The RF output port of the vector signal generator is connected to the input port of the power divider. The output port of the power divider is connected to the RF input port of the receiving part of the calibration apparatus and the CH1 port of the digital oscilloscope. The control computer is connected to the vector signal generator to control the loading waveform.

[0028] The digital oscilloscope used is a Tektronix 70604 model with a frequency range of DC to 6GHz.

[0029] The vector signal generator mentioned is a Keysight E8267D vector signal generator with a frequency range of 250kHz to 40GHz.

[0030] The beneficial effects of this invention are that the calibration device and the vector signal generator are synchronized before verification, which ensures the correlation of the distance change rate emitted by the vector signal generator. At the same time, a digital oscilloscope is used to measure the distance change during verification, and its accuracy can reach nanoseconds, which is higher than the distance change rate index of the calibration device, so that the parameters of the calibration device can be traced to general standard instruments.

[0031] By utilizing the digital modulation function of the vector signal generator, this scheme avoids the problem of a single signal type. The waveform used for the echo can be reconstructed to be completely consistent with the signal waveform used by the calibration device, enabling calibration of radar analog signals of any modulation type and greatly expanding the application scenarios of the scheme.

[0032] Using segmented storage technology not only allows you to ignore unwanted waveform segments and focus on the signals of interest, but also saves storage space on the oscilloscope. Attached Figure Description

[0033] Figure 1 This is a connection diagram of the instrument being tested and the calibration instrument of this invention.

[0034] Figure 2 This is a diagram showing the relationship between the echo signal emitted by the vector signal generator of this invention and the excitation signal emitted by the calibration device. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] The technical solution of the present invention includes the following steps:

[0037] First step: Follow Figure 1 Connect the equipment by connecting the synchronization signal of the transmitting section of the calibration device to the input port of the power divider 3, and connecting the output port of the power divider 3 to the trigger input port of the vector signal generator 1 and the CH2 port of the digital oscilloscope; connect the RF output port of the vector signal generator 1 to the input port of the power divider 4, and connect the output port of the power divider 4 to the RF input port of the receiving section of the calibration device and the CH1 port of the digital oscilloscope.

[0038] Figure 1 The diagram shows the connection between the instrument under test and the calibration instrument of the present invention. Based on the standard instrument, the vector signal transmission software controls the vector signal generator to transmit the standard distance change rate signal waveform.

[0039] Second step: Turn on the radio frequency signal and synchronization signal transmission functions of the calibration device, and synchronize the pulses of the synchronization signal and the radio frequency signal;

[0040] Third step: Use the control computer to control vector signal generator 1 to load the waveform. The relationship between the waveform and the transmitted signal is shown below:

[0041]

[0042] Where: t n Let V be the relative time value of the echo signal emitted by the vector signal generator relative to the first simulated radar signal pulse, V be the distance change rate simulated by vector signal generator 1, C be the speed of light, and T1 be the absolute time value of the first simulated radar signal pulse. n This represents the absolute time value of the nth simulated radar signal pulse.

[0043] Step 4: Use the Fast Frame segmented storage function of a digital oscilloscope to simultaneously acquire and store the echo signal and the excitation signal.

[0044] Step 5: Set the trigger level of the digital oscilloscope to be triggered by both the excitation and echo signals simultaneously. To save memory space, only the absolute occurrence time of the first pulse needs to be acquired. The hold time for triggering should be set to be greater than the time interval between the echo signal and the excitation signal, ensuring that the echo signal and the excitation signal can be acquired only once within one acquisition frame.

[0045] Step 6: Obtain the absolute occurrence time T of each frame on the oscilloscope. n .

[0046] Step 7: Measure the relative time value t of the echo signal emitted by the vector signal generator within each frame relative to the nth radar analog signal pulse. n Calculate the standard value V1 of the distance change rate at each time point:

[0047]

[0048] Figure 2 The relationship between the echo signal emitted by the vector signal generator and the excitation signal emitted by the calibration device is shown. The time interval between each echo signal pulse and the excitation signal pulse changes gradually according to the standard value of the distance change rate.

[0049] Step 8: Activate the distance change rate parameter calibration function on the calibration device. This function automatically calibrates the distance change rate parameter of the target simulation to obtain the distance change rate measurement result. The receiving part of the calibration device calibrates the distance change rate and obtains the parameter distance change rate V2.

[0050] Step 9: Calculate the distance change rate error Δ of the calibration device: Δ = V2 - V1;

[0051] Step 10: Determine whether the error meets the technical requirements for the rate of change of distance: Δ≤ maximum permissible error;

[0052] Step 11: During the actual distance change rate measurement process of the calibration device, the calibration result at this point should be reduced by the distance change rate error value Δ.

[0053] A distance change rate parameter verification device for a radar simulator calibration apparatus includes a vector signal generator, a digital oscilloscope, a power divider, and a control computer. The synchronization signal of the transmitting part of the calibration apparatus is connected to the input port of the power divider. The output port of the power divider is connected to the trigger input port of the vector signal generator and the CH2 port of the digital oscilloscope. The RF output port of the vector signal generator is connected to the input port of the power divider. The output port of the power divider is connected to the RF input port of the receiving part of the calibration apparatus and the CH1 port of the digital oscilloscope. The control computer is connected to the vector signal generator to control the loading waveform.

[0054] The digital oscilloscope used is a Tektronix 70604 model, with a frequency range of DC to 6 GHz, which meets the frequency range requirements of most calibration devices. If this is not the case, a digital oscilloscope with a higher frequency range should be selected.

[0055] The vector signal generator used is the Keysight E8267D, with a frequency range of 250kHz to 40GHz, meeting the frequency range requirements of most calibration devices. In actual testing, a vector signal generator with the same specifications can be selected.

[0056] This invention utilizes a vector signal generator and a digital oscilloscope during verification to ensure that the calibration device parameters are traceable to common standard instruments. Carrier information is also obtained during echo signal transmission, and signal synchronization is performed between the vector signal generator and the calibration device. The vector signal generator is used to vary the time interval between these intervals, ensuring the correlation between distance changes in the echo signal and the calibration device signal. Segmented storage technology is employed, dividing the existing memory into a series of segments. Data acquired after each trigger fills only one segment. Trigger conditions are defined according to test requirements, capturing only waveform segments of interest, and then storing each captured event in a memory segment with its own unique number.

Claims

1. A method for verifying the range change rate parameter of a radar simulator calibration device, characterized in that... Includes the following steps: First step: Connect the synchronization signal of the transmitting part of the calibration device to the input port of the power divider, and connect the output port of the power divider to the trigger input port of the vector signal generator and the CH2 port of the digital oscilloscope respectively. Connect the RF output port of the vector signal generator to the input port of the power divider, and connect the output port of the power divider to the RF input port of the receiving section of the calibration device and the CH1 port of the digital oscilloscope, respectively. Second step: Turn on the radio frequency signal and synchronization signal transmission functions of the calibration device, and synchronize the pulses of the synchronization signal and the radio frequency signal; Third step: Use the control computer to control the vector signal generator to load the waveform; Step 4: Use the Fast Frame segmented storage function of a digital oscilloscope to simultaneously acquire and store the echo signal and the excitation signal; Step 5: Set the trigger level of the digital oscilloscope to be triggered by both the excitation and echo signals simultaneously. To save memory space, only the absolute occurrence time of the first pulse needs to be acquired. Set the hold time of the trigger stop to be greater than the time interval between the echo signal and the excitation signal, ensuring that the echo signal and the excitation signal can be acquired only once within one acquisition frame. Step 6: Obtain the absolute occurrence time T of each frame on a digital oscilloscope. n ; Step 7: Measure the relative time value t of the echo signal within each frame with respect to the first radar analog signal pulse. n Calculate the standard value V1 of the distance change rate at each time point; Step 8: Activate the distance change rate parameter calibration function of the calibration device. This function is used to automatically calibrate the distance change rate parameter of the target simulation, thereby obtaining the distance change rate measurement result and the calibration distance change rate of the receiving part of the calibration device, and obtaining the parameter distance change rate V2. Step 9: Calculate the distance change rate error Δ of the calibration device, where Δ = V2 - V1; Step 10: Determine whether the distance change rate error Δ meets the technical requirements for distance change rate. The requirements are: Δ≤ Maximum permissible error; Step 11: During the actual distance change rate process of the calibration device, subtract the distance change rate error value Δ from the calibration result.

2. The method for verifying the range change rate parameter of the radar simulator calibration device according to claim 1, characterized in that: In the third step, the relationship between the waveform and the signal of the transmitting part is as follows: Where: t n Let T1 be the relative time value of the echo signal emitted by the vector signal generator relative to the first simulated radar signal pulse, V be the distance change rate simulated by the vector signal generator, C be the speed of light, and T1 be the absolute time value of the first simulated radar signal pulse. n This represents the absolute time value of the nth simulated radar signal pulse.

3. The method for verifying the range change rate parameter of the radar simulator calibration device according to claim 1, characterized in that: In the seventh step, the standard value V1 of the distance change rate at each time point is:

4. A radar simulator calibration device for verifying the rate of change parameter using the method of claim 1, characterized in that... Includes the following steps: The radar simulator calibration device distance change rate parameter verification device includes a vector signal generator, a digital oscilloscope, a power divider, and a control computer. The synchronization signal of the transmitting part of the calibration device is connected to the input port of the power divider. The output port of the power divider is connected to the trigger input port of the vector signal generator and the CH2 port of the digital oscilloscope. The RF output port of the vector signal generator is connected to the input port of the power divider. The output port of the power divider is connected to the RF input port of the receiving part of the calibration device and the CH1 port of the digital oscilloscope. The control computer is connected to the vector signal generator to control the loaded waveform.

5. The radar simulator calibration device for verifying the rate of change parameter according to claim 4, characterized in that: The digital oscilloscope used is a Tektronix 70604 model with a frequency range of DC to 6GHz.

6. The radar simulator calibration device for verifying the range change rate parameter according to claim 1, characterized in that: The vector signal generator mentioned is a Keysight E8267D vector signal generator with a frequency range of 250kHz to 40GHz.

Images