Multi-channel calibration device and calibration method of semi-physical injection simulation system

Abstract

The application discloses a kind of multichannel calibration equipment and calibration method of semi-physical injection simulation system, the multichannel calibration equipment includes: the input end of each calibration passage switch is connected with the output end of each channel of time phase difference simulation equipment, the output end of each calibration passage switch is respectively connected with the input end of one signal routing distributor and the input interface of measured equipment;The output end of each signal routing distributor is respectively connected with the input channel of multichannel phase calibration equipment, the input channel of multichannel time delay calibration equipment;Each calibration passage switch, multichannel phase calibration equipment, multichannel time delay calibration equipment is respectively connected with simulation device by communication and control circuit and communicates, the consistency of signal between the initial phase of each channel of time phase difference simulation equipment is calibrated, so that the signal amplitude phase, time difference consistency reaching the port of measured equipment meets system requirement.

Description

Technical Field

[0001] This invention relates to the field of radar target signal simulation technology, and in particular to a multi-channel calibration device and calibration method for a hardware-injection simulation system. Background Technology

[0002] In radar signal simulation, time-phase difference (TPD) simulation equipment is typically used to simulate the signal before transmitting it to the antenna of the device under test (DUT). However, TPD simulation equipment has a large number of channels, and frequent wiring operations can easily affect the consistency of signals between channels. For some devices under test, such as direction-finding interferometers, the signal characteristics and direction of arrival of the generated target signal are typically captured and tested. The essence of direction finding by a direction-finding interferometer is to determine the direction of arrival by utilizing the phase difference formed by radio waves on the direction-finding baseline. It mainly uses antenna array elements to obtain the phase distribution of the incident wave for direction finding. That is, by comparing the similarity between the obtained incident wave phase distribution and the pre-existing phase distributions of incoming waves at various directions and frequencies, the direction of the incident wave is obtained. Therefore, the accuracy of the time-phase difference of the incoming wave signal is required to be high.

[0003] Since the initial phase of each channel of a typical time-phase difference simulation device is random after power-on, if an uncalibrated time-phase difference simulation device is used directly, the phase of the signal sent to the device under test will be inaccurate, which will affect the test accuracy of the entire system. Therefore, it is necessary to calibrate the time-phase difference simulation device to avoid frequent wiring operations affecting the consistency of signals between channels and the inconsistency of the initial phase after power-on. Summary of the Invention

[0004] In view of this, the present invention provides a multi-channel calibration device and calibration method for a semi-physical injection simulation system.

[0005] This invention discloses a multi-channel calibration device for a semi-physical injection simulation system, which includes a time-phase simulation device, a simulation device, a device under test, and a multi-channel calibration device; the time-phase simulation device is connected to the device under test through the multi-channel calibration device; the simulation device is connected to both the time-phase simulation device and the multi-channel calibration device.

[0006] The time phase difference simulation device is used to receive the mode control signal sent by the simulation device, set the waveform mode of the time phase difference simulation device according to the mode control signal, generate the corresponding test signal according to the waveform mode, and send each test signal to the corresponding channel of the multi-channel calibration device through the corresponding output channel.

[0007] The multi-channel calibration device is used to receive switching control signals from the simulation device and send the received test signals to the corresponding channels according to the switching control signals; the channels include output channels to the output end of the multi-channel calibration device and test channels to the monitoring end of the multi-channel calibration device.

[0008] The simulation device is used to generate mode control signals for the calibration mode of the phase difference simulation equipment and switching control signals for the switching path of the multi-channel calibration equipment.

[0009] Furthermore, the simulation device is specifically used for:

[0010] It receives the output delay, output phase, and output amplitude of the signal under test from the input to the output of the multi-channel calibration device, as well as the test delay, test phase, and test amplitude of the signal under test from the input to the monitoring end of the multi-channel calibration device.

[0011] Based on the test delay, test phase, test amplitude, output delay, output phase, and output amplitude, calculate the delay difference, phase difference, and amplitude difference for each channel, and select the delay difference, phase difference, and amplitude difference of the first channel as the delay calibration value, phase calibration value, and amplitude calibration value, respectively.

[0012] Adjust the delay difference, phase difference, and amplitude difference of each channel according to the delay calibration value, phase calibration value, and amplitude calibration value; obtain the delay compensation value, phase compensation value, and amplitude compensation value that need to be adjusted for each channel;

[0013] The time delay compensation value, phase compensation value, and amplitude compensation value that need to be adjusted for each channel are fed back to the time phase difference simulation device.

[0014] Furthermore, the time phase difference simulation device is also used to adjust the time delay, phase, and amplitude of each channel according to the time delay compensation value, phase compensation value, and amplitude compensation value.

[0015] Furthermore, the multi-channel calibration device includes:

[0016] The calibration path switcher is used to output the signal to be tested to the corresponding path according to the switching control signal issued by the simulation device. The path includes an output path that outputs the signal to be tested to the output terminal of the multi-channel calibration device and a test path that outputs to the signal routing distributor. The output delay, output phase and output amplitude of the signal to be tested after passing through the output path are sent to the simulation device.

[0017] The signal routing distributor is used to allocate calibration paths to the signal under test according to the waveform pattern of the signal under test. The calibration paths include a time delay correction path output to a multi-channel time delay calibration device and an amplitude and phase calibration path output to a multi-channel phase calibration device.

[0018] A multi-channel delay calibration device is used to obtain the test delay of the signal under test from the input terminal of the calibration path switch to the input channel of the multi-channel delay calibration device; and to send the test delay of each channel to the simulation device.

[0019] The multi-channel phase calibration device is used to acquire the test phase and test amplitude of the signal under test from the input terminal of the calibration path switch to the input channel of the multi-channel phase calibration device, and send the test phase and test amplitude of each channel to the simulation device.

[0020] Furthermore, the input of each calibration path switch is connected to the output of each channel of the phase difference simulation device, and the output of each calibration path switch is connected to the input of a signal routing distributor and an input interface of the device under test, respectively.

[0021] The output of each signal routing distributor is connected to one input channel of a multi-channel phase calibration device and one input channel of a multi-channel time delay calibration device, respectively.

[0022] Each calibration path switcher, multi-channel phase calibration device, and multi-channel time delay calibration device are connected to the simulation device via communication and control circuits.

[0023] Furthermore, each calibration path switch includes a first switching switch, the input of each first switching switch is connected to the output of each channel of the phase difference simulation device, and the two outputs of each first switching switch are respectively connected to the input of a signal routing distributor and an input interface of the device under test;

[0024] Each signal routing splitter includes a 1-to-2 power divider. The input of the 1-to-2 power divider is connected to one output of the first switching switch. The two outputs of the 1-to-2 power divider are respectively connected to one input channel of the multi-channel phase calibration device and one input channel of the multi-channel time delay calibration device.

[0025] Furthermore, the multi-channel time delay calibration equipment includes a multi-channel oscilloscope, a second switching switch, and a third switching switch;

[0026] One output of each 1-to-2 power divider is connected to one input of the second switch. The outputs of the second switch are all connected to the input of the third switch. The outputs of the third switch are respectively connected to each input of the multi-channel oscilloscope.

[0027] This invention also discloses a multi-channel calibration method for a semi-physical injection simulation system, comprising:

[0028] Step 1: Delay calibration: Based on the delay compensation value that needs to be adjusted for each channel, ensure that the pulse edges of all channels of the phase difference simulation device are completely coincident;

[0029] Step 2: Amplitude and phase calibration: Based on the phase compensation value and amplitude compensation value that need to be adjusted for each channel, make the signal phase and amplitude of all channels of the time phase difference simulation device consistent.

[0030] Further, step 1 includes:

[0031] Step 11: Set the time phase difference simulation device to pulse mode, so that each channel of the time phase difference simulation device outputs a pulse signal with a low duty cycle;

[0032] Step 12: Obtain the output delay from the input terminal to the corresponding output terminal of the corresponding channel of the multi-channel calibration device for each pulse signal, and the test delay from the input terminal to the corresponding monitoring terminal of the corresponding channel of the multi-channel calibration device. Calculate the difference between the output delay and the test delay to obtain the delay difference of each channel pulse signal. Use the delay difference of the first channel pulse signal as the delay calibration value. Compare the delay differences of all other channel pulses with the delay calibration value to obtain the delay compensation value that needs to be adjusted for each channel.

[0033] Step 13: Based on the time delay compensation value that needs to be adjusted for each channel, the built-in time delay of the phase difference simulation device is fed back for adjustment, so that the pulse edges of all channels completely overlap.

[0034] Further, step 2 includes:

[0035] Step 21: Set the time phase difference simulation device to continuous wave mode so that each channel of the time phase difference simulation device outputs a continuous wave signal;

[0036] Step 22: Obtain the output phase and output amplitude of each continuous wave signal from the input terminal to the corresponding output terminal of the corresponding channel of the multi-channel calibration device, and the test phase and test amplitude from the input terminal to the corresponding monitoring terminal of the corresponding channel of the multi-channel calibration device. Calculate the difference between the output phase and the test phase, and the difference between the output amplitude and the test amplitude to obtain the phase difference and amplitude difference of each channel's continuous wave signal. Use the phase difference and amplitude difference of the first channel's continuous wave signal as the phase calibration value and amplitude calibration value, respectively. Compare the phase difference and amplitude difference of all other channel signals with the phase calibration value and amplitude calibration value, respectively, to obtain the phase compensation value and amplitude compensation value that each channel needs to adjust.

[0037] Step 23: Based on the phase compensation value and amplitude compensation value that need to be adjusted for each channel, the built-in phase value and amplitude of the phase difference simulation device are fed back during adjustment to make the signal phase and amplitude of all channels consistent.

[0038] Due to the adoption of the above technical solution, the present invention has the following advantages: it can achieve the consistency of signals between each channel of the time phase difference simulation device and the calibration of the initial phase, so as to realize that the signal amplitude, phase and time difference consistency reaching the port of the device under test meets the system requirements. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in the embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0040] Figure 1 This refers to a simulation system for the device under test in existing technologies.

[0041] Figure 2 A schematic diagram of the functional circuit of a semi-physical injection simulation calibration device provided in an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the circuit connection of a semi-physical injection simulation calibration device provided in an embodiment of the present invention;

[0043] Figure 4 A flowchart of a time delay calibration method for a semi-physical injection simulation system provided in an embodiment of the present invention;

[0044] Figure 5 A flowchart of an amplitude and phase calibration method for a semi-physical injection simulation system provided in an embodiment of the present invention. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0046] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0047] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0048] Before introducing the technical solution of this invention, the concepts involved need to be explained:

[0049] In this invention, the device under test can be a direction-finding interferometer, which mainly employs a direction-finding interferometer system to capture and test the signal characteristics and direction of arrival of the generated target signal. The essence of direction finding by a direction-finding interferometer is to determine the direction of arrival by utilizing the phase difference formed by radio waves on the direction-finding baseline. It primarily uses antenna array elements to acquire the phase distribution of the incident wave for direction finding. That is, by comparing the acquired incident wave phase distribution with pre-existing phase distributions of incoming waves at various directions and frequencies, the direction of the incident wave is obtained.

[0050] A typical direction-finding interferometer includes reconnaissance equipment, which mainly consists of a multi-channel antenna, a synchronous multi-channel receiver, digital signal processing equipment, and a terminal display device. For example... Figure 1 As shown, for testing the performance of the device under test (DUT), a typical process involves simulating the device generating a signal, which is then transmitted via a transmitting antenna. Multiple antennas then receive the simulated transmitted signals, and the results are obtained by analyzing the incident waves of the received signals. Therefore, the phase consistency of the timing difference simulation device is crucial when simulating DUT testing. Frequent wiring changes leading to signal inconsistencies between channels, or using a pre-powered timing difference simulation device, can result in inconsistent initial phases of the device's output channels. This affects the phase of the coherent RF signals transmitted by each channel, causing them to deviate from the designed phase, thus impacting the system's testing accuracy and failing to accurately reflect the characteristics of the DUT.

[0051] For this reason, see Figure 2 This application provides an embodiment of a multi-channel calibration device for a semi-physical injection simulation system, which includes a time-phase difference simulation device, a simulation device, a device under test, and a multi-channel calibration device; the time-phase difference simulation device is connected to the device under test through the multi-channel calibration device; the simulation device is connected to both the time-phase difference simulation device and the multi-channel calibration device.

[0052] The time phase difference simulation device is used to receive the mode control signal sent by the simulation device, set the waveform mode of the time phase difference simulation device according to the mode control signal, generate the corresponding test signal according to the waveform mode, and send each test signal to the corresponding channel of the multi-channel calibration device through the corresponding output channel.

[0053] The multi-channel calibration device is used to receive switching control signals from the simulation device and send the received test signals to the corresponding channels according to the switching control signals; the channels include output channels to the output end of the multi-channel calibration device and test channels to the monitoring end of the multi-channel calibration device.

[0054] The simulation device is used to generate mode control signals for the calibration mode of the phase difference simulation equipment and switching control signals for the switching path of the multi-channel calibration equipment.

[0055] In this embodiment, the simulation device is further specifically used for:

[0056] It receives the output delay, output phase, and output amplitude of the signal under test from the input to the output of the multi-channel calibration device, as well as the test delay, test phase, and test amplitude of the signal under test from the input to the monitoring end of the multi-channel calibration device.

[0057] Based on the test delay, test phase, test amplitude, output delay, output phase, and output amplitude, calculate the delay difference, phase difference, and amplitude difference for each channel, and select the delay difference, phase difference, and amplitude difference of the first channel as the delay calibration value, phase calibration value, and amplitude calibration value, respectively.

[0058] Adjust the delay difference, phase difference, and amplitude difference of each channel according to the delay calibration value, phase calibration value, and amplitude calibration value; obtain the delay compensation value, phase compensation value, and amplitude compensation value that need to be adjusted for each channel;

[0059] The time delay compensation value, phase compensation value, and amplitude compensation value that need to be adjusted for each channel are fed back to the time phase difference simulation device.

[0060] In this embodiment, the time phase difference simulation device is also used to adjust the time delay, phase and amplitude of each channel according to the time delay compensation value, phase compensation value and amplitude compensation value.

[0061] In this embodiment, the multi-channel calibration device includes:

[0062] The calibration path switcher is used to output the signal to be tested to the corresponding path according to the switching control signal issued by the simulation device. The path includes an output path that outputs the signal to be tested to the output terminal of the multi-channel calibration device and a test path that outputs to the signal routing distributor. The output delay, output phase and output amplitude of the signal to be tested after passing through the output path are sent to the simulation device.

[0063] The signal routing distributor is used to allocate calibration paths to the signal under test according to the waveform pattern of the signal under test. The calibration paths include a time delay correction path output to a multi-channel time delay calibration device and an amplitude and phase calibration path output to a multi-channel phase calibration device.

[0064] A multi-channel delay calibration device is used to obtain the test delay of the signal under test from the input terminal of the calibration path switch to the input channel of the multi-channel delay calibration device; and to send the test delay of each channel to the simulation device.

[0065] The multi-channel phase calibration device is used to acquire the test phase and test amplitude of the signal under test from the input terminal of the calibration path switch to the input channel of the multi-channel phase calibration device, and send the test phase and test amplitude of each channel to the simulation device.

[0066] In this embodiment, the input of each calibration path switcher is connected to the output of each channel of the phase difference simulation device, and the output of each calibration path switcher is connected to the input of a signal routing distributor and an input interface of the device under test.

[0067] The output of each signal routing distributor is connected to one input channel of a multi-channel phase calibration device and one input channel of a multi-channel time delay calibration device, respectively.

[0068] Each calibration path switcher, multi-channel phase calibration device, and multi-channel time delay calibration device are connected to the simulation device via communication and control circuits.

[0069] In this embodiment, each calibration path switcher includes a first switching switch. The input terminal of each first switching switch is connected to the output terminal of each channel of the time phase difference simulation device. The two output terminals of each first switching switch are respectively connected to the input terminal of a signal routing distributor and an input interface of the device under test.

[0070] Each signal routing splitter includes a 1-to-2 power divider. The input of the 1-to-2 power divider is connected to one output of the first switching switch. The two outputs of the 1-to-2 power divider are respectively connected to one input channel of the multi-channel phase calibration device and one input channel of the multi-channel time delay calibration device.

[0071] In this embodiment, the multi-channel time delay calibration device includes a multi-channel oscilloscope, a second switching switch, and a third switching switch;

[0072] One output of each 1-to-2 power divider is connected to one input of the second switch. The outputs of the second switch are all connected to the input of the third switch. The outputs of the third switch are respectively connected to each input of the multi-channel oscilloscope.

[0073] To achieve adjustment of the signal delay and phase amplitude for each channel, this embodiment configures an 8-channel vector network analyzer as a multi-channel phase calibration device and a 4-channel oscilloscope as a delay calibration device, supporting the system in completing amplitude / phase / time difference calibration. Specifically, as follows... Figure 3As shown, the multi-channel time delay calibration device includes a multi-channel oscilloscope, a second switch, and a third switch. One output terminal of each 1-to-2 power divider is connected to one input terminal of the second switch, and the output terminals of the second switch are all connected to the input terminals of the third switch. The output terminals of the third switch are respectively connected to each input terminal of the multi-channel oscilloscope.

[0074] It is understandable that, such as Figure 3 As shown, taking an 8-channel time-phase difference simulation device as an example, since an 8-channel vector network analyzer is configured as a multi-channel phase calibration device and a 4-channel oscilloscope as a multi-channel experimental calibration device, the system supports the calibration of amplitude / phase / time difference. Correspondingly, eight first switching switches (SPDT1#, SPDT2#, ..., SPDT8#) and eight 1-to-2 power dividers (Power Divider 1, Power Divider 2, ..., Power Divider 8) are set up. All first switching switches are single-pole double-throw switches. The input terminal of the first switching switch is connected to one channel of the time-phase difference simulation device, the output interface J1 is connected to one input channel of the device under test, and J2 is connected to the input terminal of a 1-to-2 power divider. One of the two output terminals of the power divider is connected to one input channel of the vector network analyzer; the other is connected to the second switching switch SP8T 9#. The second switching switch has eight input interfaces and one output interface. The output interface is connected to the third switching switch SP4T 10#, which has one input interface and four output interfaces. The output interfaces are connected to the input interfaces of the oscilloscope one by one. Meanwhile, the simulation device supports calibration and has functions such as controlling the switching of calibration paths, data import and export, and calibration compensation calculation within multi-channel calibration equipment.

[0075] The signal routing and distribution function of the multi-channel calibration device is used to distribute the signal to each channel between the phase difference simulation device and the device under test. The calibration of all channels is completed by switching the internal switches, which simplifies the operation and reduces the impact of human factors on signal quality. By working together with the calibration functions of the multi-channel calibration device and the simulation device, the calibration of multi-channel coherent signals is completed, and finally the amplitude, phase and time difference of the signal reaching the port of the device under test meet the system requirements.

[0076] like Figure 4 and Figure 5 As shown, the present invention also provides an embodiment of a multi-channel calibration method for a semi-physical injection simulation system, which is applied in a simulation device (for each power-on calibration of the phase difference simulation device). This embodiment includes the following steps:

[0077] S1, Delay calibration (e.g.) Figure 4 (as shown)

[0078] S11. Set the time phase difference simulation device to pulse mode so that each channel of the time phase difference simulation device outputs a pulse signal with a low duty cycle.

[0079] S12. Obtain the output delay from the input terminal to the corresponding output terminal of the corresponding channel of the multi-channel calibration device and the test delay from the input terminal to the corresponding monitoring terminal of the corresponding channel of the multi-channel calibration device for each pulse signal. Calculate the difference between the output delay and the test delay to obtain the delay difference of each channel pulse signal. Use the delay difference of the first channel pulse signal as the delay calibration value.

[0080] Specifically, the output end is the output of the calibration path switcher to the device under test, and the monitoring end is the input channel of the multi-channel time delay calibration device;

[0081] S13. Compare the time delay difference of all other channel pulses with the time delay calibration value to obtain the time delay compensation value that needs to be adjusted for each channel;

[0082] S14. Based on the time delay compensation value that needs to be adjusted for each channel, the built-in time delay of the phase difference simulation device is fed back for adjustment, so that the pulse edges of all channels completely overlap.

[0083] S2, Amplitude and Phase Calibration (e.g.) Figure 5 (as shown)

[0084] S21. Set the time phase difference simulation device to continuous wave mode so that each channel of the time phase difference simulation device outputs a continuous wave signal;

[0085] S22. Obtain the output phase and output amplitude of each continuous wave signal from the input terminal to the corresponding output terminal of the corresponding channel of the multi-channel calibration device, and the test phase and test amplitude from the input terminal to the corresponding monitoring terminal of the corresponding channel of the multi-channel calibration device. Calculate the difference between the output phase and the test phase, and the difference between the output amplitude and the test amplitude to obtain the phase difference and amplitude difference of each channel continuous wave signal. Use the phase difference and amplitude difference of the first channel continuous wave signal as the phase calibration value and amplitude calibration value, respectively.

[0086] S23. Compare the phase difference and amplitude difference of all other channel signals with the phase calibration value and amplitude calibration value respectively to obtain the phase compensation value and amplitude compensation value that need to be adjusted for each channel;

[0087] S24. Based on the phase compensation and amplitude compensation values ​​that need to be adjusted for each channel, the built-in phase and amplitude values ​​of the phase difference simulation device are fed back during adjustment to ensure that the signal phase and amplitude of all channels are consistent. This guarantees the phase-amplitude relationship at the connection interface of the device under test.

[0088] To facilitate understanding, the present invention provides a more specific example:

[0089] The calibration method is executed by a simulation device. In this invention, the simulation device is a host computer or other device with computing capabilities. To complete the calibration of the time-phase difference device, a test frequency is first set. At the test frequency F1, by controlling the first switch, the second switch, and the third switch, the output delay T1, output phase Q1, and output amplitude A1 of the test signal from the input terminal IN1 of the first channel of the multi-channel calibration device to the output terminal OUT1 of the device under test are obtained, respectively. The test delay T2, test phase Q2, and test amplitude A2 of the test signal from the input terminal IN1 of the first channel of the multi-channel calibration device to the corresponding monitoring terminal (multi-channel time delay calibration device or multi-channel phase calibration device) monitoring 1 are also obtained. The monitoring terminal is the input terminal of the multi-channel time delay calibration device or the multi-channel phase calibration device. T2 is the test delay of the test signal from the input terminal of the first channel of the multi-channel calibration device to the input terminal of the multi-channel time delay calibration device. Q2 and A2 are the phase and amplitude of the test signal from the input terminal of the first channel of the multi-channel calibration device to the input terminal of the multi-channel phase calibration device.

[0090] Calculate the delay difference between output delay and test delay, the phase difference between output phase and test phase, and the amplitude difference between output amplitude and test amplitude, respectively.

[0091] The absolute value of the delay difference is used as the delay calibration value, the absolute value of the phase difference is used as the phase calibration value, and the absolute value of the amplitude difference is used as the amplitude calibration value.

[0092] As shown in Table 1, under frequency F1, the time delay difference T1, amplitude difference A1, and phase difference Q1 between the input port and the output port (including cable) can be measured. Similarly, the time delay difference T2, amplitude difference A2, and phase difference Q2 between the input port and the monitoring port can be measured. The difference between the monitoring port and the output port (T2-T1, A2-A1, Q2-Q1), after removing the negative sign, can be used as the reverse compensation value for the system software, i.e., (T1-T2, A1-A2, Q1-Q2). All other channels of the multi-channel calibration equipment are compensated and corrected using the first channel as the reference and benchmark.

[0093] Table 1 Test Table

[0094]

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention 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 the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A multi-channel calibration device for a semi-physical injection simulation system, characterized in that, It includes a time phase difference simulation device, a simulation apparatus, a device under test (DUT), and a multi-channel calibration device; the time phase difference simulation device is connected to the DUT through the multi-channel calibration device; the simulation apparatus is connected to both the time phase difference simulation device and the multi-channel calibration device. The time phase difference simulation device is used to receive the mode control signal sent by the simulation device, set the waveform mode of the time phase difference simulation device according to the mode control signal, generate the corresponding test signal according to the waveform mode, and send each test signal to the corresponding channel of the multi-channel calibration device through the corresponding output channel. The multi-channel calibration device is used to receive switching control signals from the simulation device and send the received test signals to the corresponding channels according to the switching control signals; the channels include output channels to the output end of the multi-channel calibration device and test channels to the monitoring end of the multi-channel calibration device. The simulation device is used to generate mode control signals for the calibration mode of the phase difference simulation equipment and switching control signals for the switching path of the multi-channel calibration equipment. The multi-channel calibration device includes: The calibration path switcher is used to output the signal to be tested to the corresponding path according to the switching control signal issued by the simulation device. The path includes an output path that outputs the signal to be tested to the output terminal of the multi-channel calibration device and a test path that outputs to the signal routing distributor. The output delay, output phase and output amplitude of the signal to be tested after passing through the output path are sent to the simulation device. The signal routing distributor is used to allocate calibration paths to the signal under test according to the waveform pattern of the signal under test. The calibration paths include a time delay correction path output to a multi-channel time delay calibration device and an amplitude and phase calibration path output to a multi-channel phase calibration device. A multi-channel delay calibration device is used to obtain the test delay of the signal under test from the input terminal of the calibration path switch to the input channel of the multi-channel delay calibration device; and to send the test delay of each channel to the simulation device. The multi-channel phase calibration device is used to acquire the test phase and test amplitude of the signal under test from the input terminal of the calibration path switch to the input channel of the multi-channel phase calibration device, and send the test phase and test amplitude of each channel to the simulation device.

2. The multi-channel calibration device for the semi-physical injection simulation system according to claim 1, characterized in that, The simulation device is also specifically used for: It receives the output delay, output phase, and output amplitude of the signal under test from the input to the output of the multi-channel calibration device, as well as the test delay, test phase, and test amplitude of the signal under test from the input to the monitoring end of the multi-channel calibration device. Based on the test delay, test phase, test amplitude, output delay, output phase, and output amplitude, calculate the delay difference, phase difference, and amplitude difference for each channel, and select the delay difference, phase difference, and amplitude difference of the first channel as the delay calibration value, phase calibration value, and amplitude calibration value, respectively. Adjust the delay difference, phase difference, and amplitude difference of each channel according to the delay calibration value, phase calibration value, and amplitude calibration value respectively; Obtain the delay compensation value, phase compensation value, and amplitude compensation value that need to be adjusted for each channel; The time delay compensation value, phase compensation value, and amplitude compensation value that need to be adjusted for each channel are fed back to the time phase difference simulation device.

3. The multi-channel calibration device for the semi-physical injection simulation system according to claim 2, characterized in that, The time phase difference simulation device is also used to adjust the time delay, phase and amplitude of each channel according to the time delay compensation value, phase compensation value and amplitude compensation value.

4. The multi-channel calibration device for the semi-physical injection simulation system according to claim 1, characterized in that, The input of each calibration path switch is connected to the output of each channel of the phase difference simulation device, and the output of each calibration path switch is connected to the input of a signal routing distributor and an input interface of the device under test. The output of each signal routing distributor is connected to one input channel of a multi-channel phase calibration device and one input channel of a multi-channel time delay calibration device, respectively. Each calibration path switcher, multi-channel phase calibration device, and multi-channel time delay calibration device are connected to the simulation device via communication and control circuits.

5. The multi-channel calibration device for the semi-physical injection simulation system according to claim 1, characterized in that, Each calibration path switch includes a first switching switch, the input of which is connected to the output of each channel of the time phase difference simulation device, and the two outputs of each first switching switch are respectively connected to the input of a signal routing distributor and an input interface of the device under test. Each signal routing splitter includes a 1-to-2 power divider. The input of the 1-to-2 power divider is connected to one output of the first switching switch. The two outputs of the 1-to-2 power divider are respectively connected to one input channel of the multi-channel phase calibration device and one input channel of the multi-channel time delay calibration device.

6. The multi-channel calibration device for the semi-physical injection simulation system according to claim 5, characterized in that, The multi-channel time delay calibration equipment includes a multi-channel oscilloscope, a second switching switch, and a third switching switch; One output of each 1-to-2 power divider is connected to one input of the second switch. The outputs of the second switch are all connected to the input of the third switch. The outputs of the third switch are respectively connected to each input of the multi-channel oscilloscope.

7. A multi-channel calibration method for a hardware-injection simulation system, applicable to the multi-channel calibration equipment of the hardware-injection simulation system according to any one of claims 1-6, characterized in that, include: Step 1: Delay calibration: Based on the delay compensation value that needs to be adjusted for each channel, ensure that the pulse edges of all channels of the phase difference simulation device are completely coincident; Step 2: Amplitude and phase calibration: Based on the phase compensation value and amplitude compensation value that need to be adjusted for each channel, make the signal phase and amplitude of all channels of the time phase difference simulation device consistent.

8. The multi-channel calibration method for the semi-physical injection simulation system according to claim 7, characterized in that, Step 1 includes: Step 11: Set the time phase difference simulation device to pulse mode, so that each channel of the time phase difference simulation device outputs a pulse signal with a low duty cycle; Step 12: Obtain the output delay from the input terminal to the corresponding output terminal of the corresponding channel of the multi-channel calibration device for each pulse signal, and the test delay from the input terminal to the corresponding monitoring terminal of the corresponding channel of the multi-channel calibration device. Calculate the difference between the output delay and the test delay to obtain the delay difference of each channel pulse signal. Use the delay difference of the first channel pulse signal as the delay calibration value. Compare the delay differences of all other channel pulses with the delay calibration value to obtain the delay compensation value that needs to be adjusted for each channel. Step 13: Based on the time delay compensation value that needs to be adjusted for each channel, the built-in time delay of the phase difference simulation device is fed back for adjustment, so that the pulse edges of all channels completely overlap.

9. The multi-channel calibration method for the semi-physical injection simulation system according to claim 7, characterized in that, Step 2 includes: Step 21: Set the time phase difference simulation device to continuous wave mode so that each channel of the time phase difference simulation device outputs a continuous wave signal; Step 22: Obtain the output phase and output amplitude of each continuous wave signal from the input terminal to the corresponding output terminal of the corresponding channel of the multi-channel calibration device, and the test phase and test amplitude from the input terminal to the corresponding monitoring terminal of the corresponding channel of the multi-channel calibration device. Calculate the difference between the output phase and the test phase, and the difference between the output amplitude and the test amplitude to obtain the phase difference and amplitude difference of each channel's continuous wave signal. Use the phase difference and amplitude difference of the first channel's continuous wave signal as the phase calibration value and amplitude calibration value, respectively. Compare the phase difference and amplitude difference of all other channel signals with the phase calibration value and amplitude calibration value, respectively, to obtain the phase compensation value and amplitude compensation value that each channel needs to adjust. Step 23: Based on the phase compensation value and amplitude compensation value that need to be adjusted for each channel, the built-in phase value and amplitude of the phase difference simulation device are fed back during adjustment to make the signal phase and amplitude of all channels consistent.

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