CN116500567B - Semi-physical injection simulation system and method - Google Patents
Semi-physical injection simulation system and method Download PDFInfo
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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Abstract
The application discloses a semi-physical injection simulation system and a method, which relate to the field of radar target signal simulation, and comprise a simulation device for simulating a target echo signal and generating a target parameter file according to the echo signal; the simulation device is used for generating a plurality of phase-coherent radio frequency signals with amplitude-phase/time-difference changes according to the target parameter file, and directly injecting each generated phase-coherent radio frequency signal into each receiving channel of the tested device at the same time through each corresponding output channel in a coaxial injection mode, and is also used for receiving a calculation result obtained after the tested device performs calculation by using the injected phase-coherent radio frequency signals; and comparing the calculation result with a preset labeling result, and detecting the calculation precision of the tested equipment. According to the application, the tested equipment is a direction-finding interferometer, and the tested equipment is quickly simulated and verified by constructing a complex battlefield environment, so that the design advancement of the tested equipment is promoted and the technical index is ensured to meet the real battlefield requirement.
Description
Technical Field
The application relates to the field of radar signal simulation, in particular to a semi-physical injection simulation system and method.
Background
The radar direction-finding interferometer mainly adopts a direction-finding system of the direction-finding interferometer to capture and test the signal characteristics and the incoming wave direction of the generated target signal. The essence of direction finding by a direction finding interferometer is to determine the direction of an incoming wave by using the phase difference formed by radio waves on a direction finding base line. The method mainly utilizes antenna array elements to acquire the phase distribution of incident waves to measure the direction. That is, the direction of the incident wave is obtained by comparing the acquired phase distribution of the incident wave with the previously stored phase distribution of the incoming wave at each azimuth and each frequency. Before the direction-finding interferometer is put into practical use, the direction-finding interferometer needs to be tested by simulating the practical scene, the performance of the direction-finding interferometer is detected to improve the direction-finding accuracy of the direction-finding interferometer, and different incident wave phases need to be simulated to simulate real target echoes. However, because the use scene of the direction-finding interferometer is very complex and the targets are also relatively disordered, how to construct a simulation environment which can be used for carrying out quick simulation and verification on the direction-finding interferometer is very important.
Disclosure of Invention
The application aims to provide a semi-physical injection simulation system and a semi-physical injection simulation method, which adopt a coaxial injection mode to directly send multichannel signals generated by time-phase simulation equipment into a same-frequency multichannel receiver of tested equipment. According to the application, the tested equipment is a direction-finding interferometer, and the determined amplitude and phase relation exists among all paths of signals of the multichannel signals, and the tested equipment is quickly simulated and verified by constructing a complex battlefield environment, so that the design advancement of the tested equipment is promoted and the technical index is ensured to meet the real battlefield requirement.
In one aspect, the present application provides a semi-physical injection simulation system, comprising: a simulation device and a time phase simulation apparatus having a plurality of output channels, wherein,
the simulation device is used for simulating a target echo signal, wherein the echo signal is a signal generated by the target after receiving a radar signal sent by the tested equipment; generating a target parameter file according to the echo signal, and transmitting the target parameter file to a time difference simulation device;
the time difference simulation device is used for generating a plurality of phase-related radio frequency signals with amplitude-phase/time difference changes according to the target parameter file, and each generated phase-related radio frequency signal is directly injected into each receiving channel of the same-frequency multi-channel receiver of the tested device at the same time through each corresponding output channel in a coaxial injection mode;
the simulation device is also used for receiving a calculation result obtained after the tested equipment performs calculation by using the injected coherent radio frequency signals; and comparing the calculation result with a preset labeling result, and detecting the calculation precision of the tested equipment.
Further, each output channel of the time-phase analog device is connected with a coaxial cable, a plurality of receiving channels of the same-frequency multichannel receiver are all radio frequency access ports, and each output channel is connected with the radio frequency access ports through the coaxial cable.
Further, the simulation device is used for simulating a plurality of echo signals generated after a plurality of targets at the same position and at the same moment receive radar signals sent by the tested equipment, synthesizing the echo signals into an overlapped echo signal, generating a target parameter file according to the overlapped echo signals, and sending the target parameter file to the time difference simulation equipment.
Further, the simulation apparatus includes:
the simulation target construction module is used for simulating a plurality of echo signal parameters respectively generated after a plurality of targets at the same position and at the same moment receive radar signals sent by tested equipment;
the ARB modulation module is used for synthesizing echo signal parameters of a plurality of simulation targets by utilizing an ARB mode to generate a multi-target synthesized waveform file; extracting overlapped waveform fragments from the multi-target synthesized waveform file, and storing the overlapped waveform fragments into an ARB waveform list file according to a time sequence;
the PDW modulation module is used for synthesizing echo signal parameters of a plurality of simulation targets by utilizing a PDW mode to generate a PDW synthesis description file; adding a marking field and a control field in the PDW synthesis description file to generate a PDW overlapped waveform description file;
the control field is used for judging whether to call the overlapped waveform fragments under the corresponding time sequence from the ARB waveform list file according to the marks of the mark fields;
and the sending module is used for sending the target parameter file to the time phase simulation equipment, wherein the target parameter file comprises a PDW overlapped waveform description file and an ARB waveform list file.
Further, the phase difference simulation apparatus includes:
the analysis module is used for analyzing the PDW overlapped waveform description file to obtain a plurality of pieces of description data arranged according to time sequence; for each piece of description data, firstly reading a mark field of the piece of description data;
the signal generation module is used for generating a radio frequency signal under the current time sequence according to the mark of the mark field: when the marks of the mark fields are overlapped, calling an overlapped waveform segment corresponding to the current time sequence from the ARB waveform list file according to the control word of the control field; performing radio frequency modulation on the overlapped waveform segments corresponding to the current time sequence to generate a radio frequency signal under the current time sequence;
when the marks of the mark fields are non-overlapping, performing radio frequency modulation on all the fields corresponding to the data, and generating a radio frequency signal under the current time sequence;
the coherent radio frequency signal generation module is used for adjusting the amplitude phase/time difference of the radio frequency signals generated by the signal generation module to generate a plurality of different coherent radio frequency signals;
and the injection module is used for respectively and directly injecting a plurality of different coherent radio frequency signals into the tested equipment through a plurality of output channels.
In a second aspect, the application provides a semi-physical injection simulation method, which comprises the following steps:
s1, receiving a target parameter file issued by a simulation device by time-phase simulation equipment, wherein the target parameter file is a target parameter file generated by the simulation device according to a simulation target echo signal; the echo signal is a signal generated after a target receives a radar signal sent by tested equipment;
s2, generating a plurality of phase-coherent radio frequency signals with amplitude-phase/time-difference changes by the phase-phase simulation equipment according to the target parameter file;
s3, the phase-time phase simulation equipment adopts a coaxial injection mode, and each generated phase-reference radio frequency signal is directly injected into each receiving channel of the same-frequency multi-channel receiver of the tested equipment at the same time through each corresponding output channel.
Further, the echo signals are overlapped echo signals, and the overlapped echo signals are synthesized by a plurality of echo signals generated after a plurality of targets at the same position and at the same time receive radar signals sent by the tested equipment.
Further, the target parameter file includes a PDW overlapping waveform description file and an ARB waveform list file, and the generating process of the target parameter file is as follows:
s11, simulating a plurality of echo signal parameters respectively generated by a plurality of targets at the same position and at the same moment after receiving radar signals sent by tested equipment;
s12, synthesizing echo signal parameters of a plurality of simulation targets by using an ARB mode to generate a multi-target synthesized waveform file; extracting overlapped waveform fragments from the multi-target synthesized waveform file, and storing the overlapped waveform fragments into an ARB waveform list file according to a time sequence;
s13, synthesizing echo signal parameters of a plurality of simulation targets by using a PDW mode to generate a PDW synthesis description file; adding a marking field and a control field in the PDW synthesis description file to generate a PDW overlapped waveform description file; the mark field is used for marking whether echo signal parameters of a plurality of simulation targets are overlapped or not at the current time sequence, and the control field is used for judging whether to call overlapped waveform fragments at the corresponding time sequence from the ARB waveform list file or not according to the mark of the mark field.
Further, the specific process of generating the coherent radio frequency signal is as follows:
s21, analyzing the PDW overlapped waveform description file to obtain a plurality of pieces of description data arranged according to time sequence; for each piece of description data, firstly reading a mark field of the piece of description data;
s22, generating a radio frequency signal under the current time sequence according to the mark of the mark field: when the marks of the mark fields are overlapped, calling an overlapped waveform segment corresponding to the current time sequence from the ARB waveform list file according to the control word of the control field; performing radio frequency modulation on the overlapped waveform segments corresponding to the current time sequence to generate a radio frequency signal under the current time sequence;
when the marks of the mark fields are non-overlapping, performing radio frequency modulation on all the fields corresponding to the data, and generating a radio frequency signal under the current time sequence;
s23, performing amplitude-phase/time difference adjustment on the radio frequency signals generated by the signal generation module to generate a plurality of different coherent radio frequency signals.
The application has the beneficial effects that:
the application constructs an injection simulation system capable of simulating an actual scene, takes a direction-finding interferometer as tested equipment, adopts a coaxial injection mode, and directly sends multichannel signals generated by the time-phase simulation equipment into a same-frequency multichannel receiver of the tested equipment (direction-finding interferometer). And a certain amplitude and phase relation exists between the signals of the multi-channel signals.
The application can simulate the long-time overlapping condition of multiple targets, process the overlapping signals of multiple targets by adopting a PDW+ARB mode, finally generate a long-time overlapping coherent radio frequency signal, and superimpose and compound the multiple target signals into a signal for transmission by adopting an ARB coding mode when the multiple target signals are overlapped.
Drawings
FIG. 1 is a schematic diagram of a simulation method of a device under test in the prior art;
FIG. 2 is a schematic diagram of a semi-physical simulation injection system according to the present application;
FIG. 3 is a schematic diagram of a semi-physical simulation injection system under a multi-objective simulation scenario according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a semi-physical simulation injection method according to an embodiment of the present application;
FIG. 5 is a flowchart illustrating a method for generating a target parameter file according to an embodiment of the present application;
fig. 6 is a schematic diagram of data storage of a PDW overlapped waveform description file according to an embodiment of the present application;
fig. 7 is a schematic diagram of a waveform of a synthesized signal generated after overlapping waveform files of a multi-target signal according to an embodiment of the present application;
fig. 8 is a schematic diagram of a time domain signal of the target signal #1 in fig. 7 at a certain time;
fig. 9 is a schematic diagram of a time domain signal of the target signal #2 in fig. 7 at a certain time
Fig. 10 is a schematic diagram of vector synthesis of the overlapped signal in the time domain when the waveforms of the target signal #1 and the target signal #2 in fig. 8 and 9 overlap.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
In addition, descriptions of well-known structures, functions and configurations may be omitted for clarity and conciseness. Those of ordinary skill in the art will recognize that various changes and modifications of the examples described herein can be made without departing from the spirit and scope of the present disclosure.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
Before introducing the technical scheme of the application, concepts to be involved are described:
1、PDW：
the PDW is a pulse descriptor which can describe long-time pulse characteristics by occupying a small amount of memory, and the pulse descriptor is a signal specially used for describing a pulse modulation type, and has the advantage of greatly reducing the data volume. For one signal source, a plurality of transmitters can be simulated by writing scene information by using a radar pulse word (PDW), and specific scenes such as a scene of a high-density signal, an angle of arrival (AOA) and the like can be simulated by using a plurality of signal sources. The signal system of the traditional waveform playing mode is flexible, but the memory occupies a large playing time and is limited; the memory is greatly saved by adopting a PDW state storage mode, and scene playing for a few hours is easily realized; the infinite long-time scene simulation can be realized through the real-time PDW input mode. The Pulse Descriptor (PDW) describes an important feature of the information carried by each pulse seen by a receiver.
2、ARB：
ARB represents an arbitrary waveform file, is a vector signal generation mode, and the process of the ARB mode before DAC is realized on a PC through corresponding software (the software can be Agilent signal studio, matlab, visual), and the data is stored in a RAM in a signal source in the form of a waveform file after being encoded. The ARB is flexible in application and can be used for generating arbitrary waveforms in a user-defined manner.
The tested equipment adopted by the application is military equipment, and mainly adopts a direction-finding interferometer direction-finding system to capture and test the signal characteristics and the incoming wave direction of the generated target signal. The essence of direction finding by a direction finding interferometer is to determine the direction of an incoming wave by using the phase difference formed by radio waves on a direction finding base line. The method mainly utilizes antenna array elements to acquire the phase distribution of incident waves to measure the direction. That is, the direction of the incident wave is obtained by comparing the acquired phase distribution of the incident wave with the previously stored phase distribution of the incoming wave at each azimuth and each frequency. The direction finding interferometer is provided with a detection device which mainly comprises a multichannel antenna, a synchronous multichannel receiver, a digital signal processing device and a terminal display device. As shown in fig. 1, for testing the performance of a tested device, generally, a signal generated by an analog device is transmitted by a transmitting antenna, then, a multichannel antenna receives the analog transmitting signal X (t) respectively, in fig. 1, X1 (t) -XM (t) represents the transmitting signals received by each channel antenna of a direction-finding interferometer at the same time t, a synchronous multichannel receiver processes the transmitting signals X1 (t) -XM (t) respectively to obtain corresponding incident waves X1 (n) -XM (n), a digital signal processing device analyzes the received incident waves X1 (n) -XM (n) of the transmitting signals to obtain a calculation result, and a terminal display device displays the calculation result. Because the distance between a real target and tested equipment needs to be simulated, the simulation is troublesome, and the application adopts the following scheme aiming at the problem:
example 1: as shown in fig. 2, embodiment 1 provides a semi-physical injection simulation system, which includes: a simulation device and a time phase simulation apparatus having a plurality of output channels, wherein,
the simulation device is used for simulating a target echo signal, wherein the echo signal is a signal generated by the target after receiving a radar signal sent by the tested equipment; generating a target parameter file according to the echo signal, and transmitting the target parameter file to a time difference simulation device;
the time difference simulation device is used for generating a plurality of phase-related radio frequency signals with amplitude-phase/time difference changes according to the target parameter file, and each generated phase-related radio frequency signal is directly injected into each receiving channel of the same-frequency multi-channel receiver of the tested device at the same time through each corresponding output channel in a coaxial injection mode;
the simulation device is also used for receiving a calculation result obtained after the tested equipment performs calculation by using the injected coherent radio frequency signals; and comparing the calculation result with a preset labeling result, and detecting the calculation precision of the tested equipment.
Specifically, the key of the system is that the coherent radio frequency signals corresponding to all channels are generated, and the amplitude, phase and time delay relation among all channels can be accurately adjustable. Each output channel of the time-phase difference simulation device is connected with a coaxial cable, a plurality of receiving channels of the same-frequency multichannel receiver are all radio frequency access ports, and each output channel is connected with the radio frequency access ports through the coaxial cable.
For a plurality of targets transmitting signals at the same time, an overlapped waveform is generated in actual situations, so that the simulation device in this embodiment can be used to simulate a plurality of echo signals generated after the plurality of targets at the same position and the same time receive the radar signal sent by the tested device, synthesize the plurality of echo signals into an overlapped echo signal, generate a target parameter file according to the overlapped echo signal, and send the target parameter file to the time difference simulation device.
In the implementation process, as shown in fig. 3, the simulation device includes:
the simulation target construction module is used for simulating a plurality of echo signal parameters respectively generated after a plurality of targets at the same position and at the same moment receive radar signals sent by tested equipment;
the ARB modulation module is used for synthesizing echo signal parameters of a plurality of simulation targets by utilizing an ARB mode to generate a multi-target synthesized waveform file; extracting overlapped waveform fragments from the multi-target synthesized waveform file, and storing the overlapped waveform fragments into an ARB waveform list file according to a time sequence;
the PDW modulation module is used for synthesizing echo signal parameters of a plurality of simulation targets by utilizing a PDW mode to generate a PDW synthesis description file; adding a marking field and a control field in the PDW synthesis description file to generate a PDW overlapped waveform description file;
the control field is used for judging whether to call the overlapped waveform fragments under the corresponding time sequence from the ARB waveform list file according to the marks of the mark fields;
and the sending module is used for sending the target parameter file to the time phase simulation equipment, wherein the target parameter file comprises a PDW overlapped waveform description file and an ARB waveform list file.
The phase difference simulation apparatus includes:
the analysis module is used for analyzing the PDW overlapped waveform description file to obtain a plurality of pieces of description data arranged according to time sequence; for each piece of description data, firstly reading a mark field of the piece of description data;
the signal generation module is used for generating a radio frequency signal under the current time sequence according to the mark of the mark field: when the marks of the mark fields are overlapped, calling an overlapped waveform segment corresponding to the current time sequence from the ARB waveform list file according to the control word of the control field; performing radio frequency modulation on the overlapped waveform segments corresponding to the current time sequence to generate a radio frequency signal under the current time sequence;
when the marks of the mark fields are non-overlapping, performing radio frequency modulation on all the fields corresponding to the data, and generating a radio frequency signal under the current time sequence;
the coherent radio frequency signal generation module is used for adjusting the amplitude phase/time difference of the radio frequency signals generated by the signal generation module to generate a plurality of different coherent radio frequency signals;
and the injection module is used for respectively and directly injecting a plurality of different coherent radio frequency signals into the tested equipment through a plurality of output channels.
It can be understood that the semi-physical injection simulation system in this embodiment is mainly used for performing rapid simulation and verification on the tested device by constructing a complex battlefield environment, promoting the design advancement of the tested device and ensuring that the technical index meets the real battlefield requirement. Mainly realizes the following functions:
a) The echo signal of the inclusion sum and difference channel which is modulated by RCS, distance delay, space attenuation and Doppler frequency shift according to scene information can be generated by simulating the echo characteristics of the moving target after the irradiation of the tested radars at different positions;
b) Simulating at least 4 co-frequency/non-co-frequency target signals at different positions at the same time in the instantaneous bandwidth, and deducing along with the movement of the target to generate 8-channel coherent radio frequency signals with the amplitude-phase/time difference variation of the multi-target signals reaching the interface of the receiver of the tested equipment according to scene planning;
c) Simulating the capability of at least 40 time-sharing multi-target signals in the instantaneous bandwidth, and deducing along with the movement of the target, and generating 8-channel coherent radio frequency signals with the amplitude-phase/time-difference variation of the multi-target signals reaching the receiver port surface of the tested equipment according to the scene planning.
The key of the system is that the coherent radio frequency signals of multiple channels are generated, the determined amplitude and phase relation exists among all the channels, and the coherent radio frequency signals are directly transmitted to the same-frequency multiple-channel receiver in a desktop coaxial injection mode. The system is connected to the tested equipment in an injection mode, so that the tested equipment is simulated to be received by a plurality of antennas of the receiving equipment after an aerial target passes through different paths, and the radio frequency access port is required to be excited. In this embodiment, the device under test is 8 channels, so the system needs to generate different reference rf signals with amplitude/phase difference variation corresponding to the 8 channels.
Example 2: as shown in fig. 4, the embodiment provides a semi-physical injection simulation method, which includes the following steps:
s1, receiving a target parameter file issued by a simulation device by time-phase simulation equipment, wherein the target parameter file is a target parameter file generated by the simulation device according to a simulation target echo signal; the echo signal is a signal generated after a target receives a radar signal sent by tested equipment;
when the echo signals are overlapped echo signals, the overlapped echo signals are synthesized by a plurality of echo signals generated after a plurality of targets at the same position and at the same time receive radar signals sent by tested equipment. At this time, the target parameter file includes a PDW overlapped waveform description file and an ARB waveform list file, as shown in fig. 5, the generation process of the target parameter file is:
s11, simulating a plurality of echo signal parameters respectively generated by a plurality of targets at the same position and at the same moment after receiving radar signals sent by tested equipment;
s12, synthesizing echo signal parameters of a plurality of simulation targets by using an ARB mode to generate a multi-target synthesized waveform file; extracting overlapped waveform fragments from the multi-target synthesized waveform file, and storing the overlapped waveform fragments into an ARB waveform list file according to a time sequence; the ARB waveform list includes signal parameters of waveform segments of the overlapping portion and their corresponding pulse arrival times.
Specifically, the synthesis processing procedure in step S12 is:
encoding signal parameters corresponding to each simulation target according to an ARB format to obtain a waveform file corresponding to each simulation target; vector synthesis is carried out on the waveform files corresponding to all the simulation targets, and a multi-target synthesized waveform file is obtained; converting waveform files corresponding to all simulation targets into time domain signals in the same time domain respectively; overlapping the amplitudes of all the time domain signals at the same time to obtain multi-target overlapped time domain signals; taking an example of an overlapped waveform segment of the target signal waveform #1 and the target signal waveform #2 in a certain time domain in fig. 7, the overlapped waveform segment of the waveform #1 is converted into a #1 time domain signal in the time domain as shown in fig. 8, the overlapped waveform segment of the waveform #2 is converted into a #2 time domain signal in the time domain as shown in fig. 9, the #1 time domain signal in the time domain and the #2 time domain signal are vector-synthesized into one synthesized time domain signal, and the result of vector synthesis is shown in fig. 10.
S13, synthesizing echo signal parameters of a plurality of simulation targets by using a PDW mode to generate a PDW synthesis description file; adding a marking field and a control field in the PDW synthesis description file to generate a PDW overlapped waveform description file; the mark field is used for marking whether echo signal parameters of a plurality of simulation targets are overlapped or not at the current time sequence, and the control field is used for judging whether to call overlapped waveform fragments at the corresponding time sequence from the ARB waveform list file or not according to the mark of the mark field. It can be seen that the actual control field is bound to the ARB waveform list.
S2, generating a plurality of phase-coherent radio frequency signals with amplitude-phase/time-difference changes by the phase-phase simulation equipment according to the target parameter file;
the specific process for generating the coherent radio frequency signal comprises the following steps:
s21, analyzing the PDW overlapped waveform description file to obtain a plurality of pieces of description data arranged according to time sequence; for each piece of description data, firstly reading a mark field of the piece of description data;
s22, generating a radio frequency signal under the current time sequence according to the mark of the mark field: when the marks of the mark fields are overlapped, calling an overlapped waveform segment corresponding to the current time sequence from the ARB waveform list file according to the control word of the control field; performing radio frequency modulation on the overlapped waveform segments corresponding to the current time sequence to generate a radio frequency signal under the current time sequence;
when the marks of the mark fields are non-overlapping, performing radio frequency modulation on all the fields corresponding to the data, and generating a radio frequency signal under the current time sequence;
s23, performing amplitude-phase/time difference adjustment on the radio frequency signals generated by the signal generation module to generate a plurality of different coherent radio frequency signals.
S3, the phase-time phase simulation equipment adopts a coaxial injection mode, and each generated phase-reference radio frequency signal is directly injected into each receiving channel of the same-frequency multi-channel receiver of the tested equipment at the same time through each corresponding output channel.
It will be appreciated that the data structure of the PDW overlap waveform description file in this embodiment includes fields: pulse time of arrival (TOA), pulse Width (Width), carrier frequency (Center), frequency Offset (Offset), phase (Phase), amplitude (Level), echo type (MOP), mark field, and control field. Specifically, as shown in fig. 6, a data storage structure of a PDW overlapped waveform description file is given, where TOA is in units of milliseconds (ms), width is in units of microseconds (us), center is in units of GHz, offset is in units of kHz, phase is omitted, and is represented by x, level is in units of dB, and CW represents radar continuous wave. It should be noted that, the time sequence, the current time sequence and the pulse arrival time mentioned in the present application are corresponding, and it can be understood that the current time sequence takes the current pulse arrival time as the starting time, the whole time period from the current time sequence to the arrival time of the next pulse is the current time sequence, and the starting time of the time sequence is the arrival time of the previous pulse in the two adjacent pulses.
Referring to fig. 7, if the waveforms generated by the pulse signal parameters of the three simulation targets are #1, #2, and #3, it can be seen that the three targets overlap at time sequences T1-T2 and T3-T4, so that vector waveforms of the three waveform files are superimposed by an ARB method, and finally a resultant waveform is generated, as shown by resultant waveform Result in fig. 7, an overlapping waveform segment is extracted from the resultant waveform Result (Result), and pulse arrival time and end time of the overlapping waveform segment are recorded, and sequentially stored in an ARB waveform list according to the storage sequence numbers of 1# and 2# … in order of pulse arrival time, and finally an ARB waveform list file is generated according to the ARB waveform list.
Meanwhile, for the multi-target waveforms of fig. 7, the PDW synthesis description file is generated according to the PDW mode, and since the PDW discards the waveform with lower priority in the PDW synthesis description file at the time sequence of waveform overlapping, only one target waveform is reserved, and therefore, a control field and a flag field need to be added in the PDW synthesis description file. When the PDW synthesis description file is generated, simultaneously recording when the waveform fragments are discarded, wherein the waveform at the time sequence is non-overlapped when 0 represents the arrival time of the pulse to the arrival time of the next pulse in the mark field, and the waveform at the time sequence is overlapped when 1 represents the arrival time of the pulse to the arrival time of the next pulse; when the tag value of the tag field is read to be 0, the conventional PDW mode can be directly adopted, and all fields of the data corresponding to the current time sequence are generated into a parameter file so as to carry out radio frequency modulation, so that a radio frequency signal under the current time sequence is generated. If the tag value is 1, the control field is read, and the overlapped waveform segment corresponding to the current time sequence is called from the ARB waveform list file according to the control word of the control field, specifically, since the pulse arrival time of the TOA field of the PDW overlapped waveform description file corresponds to the time sequence start time of the ARB waveform list, the overlapped waveform segment corresponding to the storage sequence number can be called from the ARB waveform list according to the pulse arrival time.
The PDW overlapped waveform description file of fig. 6 is sent to the time difference simulation device, each piece of data is sequentially read according to time sequence, and the arrival interval of two adjacent pulses can be regarded as a time sequence, for example, signals of a plurality of targets overlap in a period of T1-T2, so that overlapped waveform fragments with a storage sequence number of 1# are called from the ARB waveform list file according to a control word, multi-target signal transmission is generated according to the overlapped waveform fragments, but in the period of T2-T3, the situation is non-overlapped, and at this time, the target signal transmission can be directly generated according to the PDW overlapped waveform description file corresponding to the time T2. Similarly, in the period of T5-T6, the multi-target signals overlap, and at the moment, overlapping waveform fragments with the storage sequence number of 2# are called from the ARB waveform list file again, and multi-target signal transmission is generated according to the overlapping waveform fragments.
The foregoing description of the preferred embodiment of the application is not intended to limit the application in any way, but rather to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the application.
Claims (6)
1. A semi-physical injection simulation system, comprising: a simulation device and a time phase simulation apparatus having a plurality of output channels, wherein,
the simulation device is used for simulating a target echo signal, wherein the echo signal is a signal generated by the target after receiving a radar signal sent by the tested equipment; generating a target parameter file according to the echo signal, and transmitting the target parameter file to a time difference simulation device;
the time difference simulation device is used for generating a plurality of phase-related radio frequency signals with amplitude-phase/time difference changes according to the target parameter file, and each generated phase-related radio frequency signal is directly injected into each receiving channel of the same-frequency multi-channel receiver of the tested device at the same time through each corresponding output channel in a coaxial injection mode;
the simulation device is also used for receiving a calculation result obtained after the tested equipment performs calculation by using the injected coherent radio frequency signals; comparing the calculation result with a preset labeling result, and detecting the calculation precision of the tested equipment;
the simulation device is used for simulating a plurality of echo signals generated after a plurality of targets at the same position and at the same moment receive radar signals sent by tested equipment, synthesizing the echo signals into an overlapped echo signal, generating a target parameter file according to the overlapped echo signals, and sending the target parameter file to the time difference simulation equipment;
the simulation device includes:
the simulation target construction module is used for simulating a plurality of echo signal parameters respectively generated after a plurality of targets at the same position and at the same moment receive radar signals sent by tested equipment;
the ARB modulation module is used for synthesizing echo signal parameters of a plurality of simulation targets by utilizing an ARB mode to generate a multi-target synthesized waveform file; extracting overlapped waveform fragments from the multi-target synthesized waveform file, and storing the overlapped waveform fragments into an ARB waveform list file according to a time sequence;
the PDW modulation module is used for synthesizing echo signal parameters of a plurality of simulation targets by utilizing a PDW mode to generate a PDW synthesis description file; adding a marking field and a control field in the PDW synthesis description file to generate a PDW overlapped waveform description file;
the control field is used for judging whether to call the overlapped waveform fragments under the corresponding time sequence from the ARB waveform list file according to the marks of the mark fields;
and the sending module is used for sending the target parameter file to the time phase simulation equipment, wherein the target parameter file comprises a PDW overlapped waveform description file and an ARB waveform list file.
2. The semi-physical injection simulation system of claim 1, wherein each output channel of the time-phase simulation device is connected with a coaxial cable, a plurality of receiving channels of the same-frequency multi-channel receiver are radio frequency access ports, and each output channel is connected with one radio frequency access port through the coaxial cable.
3. The semi-physical injection simulation system of claim 1 wherein said phase difference simulation means comprises:
the analysis module is used for analyzing the PDW overlapped waveform description file to obtain a plurality of pieces of description data arranged according to time sequence; for each piece of description data, firstly reading a mark field of the piece of description data;
the signal generation module is used for generating a radio frequency signal under the current time sequence according to the mark of the mark field: when the marks of the mark fields are overlapped, calling an overlapped waveform segment corresponding to the current time sequence from the ARB waveform list file according to the control word of the control field; performing radio frequency modulation on the overlapped waveform segments corresponding to the current time sequence to generate a radio frequency signal under the current time sequence;
when the marks of the mark fields are non-overlapping, performing radio frequency modulation on all fields corresponding to the piece of description data to generate a radio frequency signal under the current time sequence;
the coherent radio frequency signal generation module is used for adjusting the amplitude phase/time difference of the radio frequency signals generated by the signal generation module to generate a plurality of different coherent radio frequency signals;
and the injection module is used for respectively and directly injecting a plurality of different coherent radio frequency signals into the tested equipment through a plurality of output channels.
4. The semi-physical injection simulation method is characterized by comprising the following steps of:
s1, receiving a target parameter file issued by a simulation device by time-phase simulation equipment, wherein the target parameter file is a target parameter file generated by the simulation device according to a simulation target echo signal; the echo signal is a signal generated after a target receives a radar signal sent by tested equipment;
the target parameter file comprises a PDW overlapped waveform description file and an ARB waveform list file, and the generation process of the target parameter file comprises the following steps:
s11, simulating a plurality of echo signal parameters respectively generated by a plurality of targets at the same position and at the same moment after receiving radar signals sent by tested equipment;
s12, synthesizing echo signal parameters of a plurality of simulation targets by using an ARB mode to generate a multi-target synthesized waveform file; extracting overlapped waveform fragments from the multi-target synthesized waveform file, and storing the overlapped waveform fragments into an ARB waveform list file according to a time sequence;
s13, synthesizing echo signal parameters of a plurality of simulation targets by using a PDW mode to generate a PDW synthesis description file; adding a marking field and a control field in the PDW synthesis description file to generate a PDW overlapped waveform description file; the control field is used for judging whether to call the overlapped waveform fragments under the corresponding time sequence from the ARB waveform list file according to the marks of the mark fields;
s2, generating a plurality of phase-coherent radio frequency signals with amplitude-phase/time-difference changes by the phase-phase simulation equipment according to the target parameter file;
s3, the phase-time phase simulation equipment adopts a coaxial injection mode, and each generated phase-reference radio frequency signal is directly injected into each receiving channel of the same-frequency multi-channel receiver of the tested equipment at the same time through each corresponding output channel.
5. The method for simulating semi-physical injection according to claim 4, wherein the echo signals are overlapped echo signals, and the overlapped echo signals are synthesized by a plurality of echo signals generated after a plurality of targets at the same position and at the same time receive radar signals sent by the tested device.
6. The semi-physical injection simulation method of claim 4, wherein the specific process of generating the coherent radio frequency signal is:
s21, analyzing the PDW overlapped waveform description file to obtain a plurality of pieces of description data arranged according to time sequence; for each piece of description data, firstly reading a mark field of the piece of description data;
s22, generating a radio frequency signal under the current time sequence according to the mark of the mark field: when the marks of the mark fields are overlapped, calling an overlapped waveform segment corresponding to the current time sequence from the ARB waveform list file according to the control word of the control field; performing radio frequency modulation on the overlapped waveform segments corresponding to the current time sequence to generate a radio frequency signal under the current time sequence;
when the marks of the mark fields are non-overlapping, performing radio frequency modulation on all fields corresponding to the piece of description data to generate a radio frequency signal under the current time sequence;
s23, performing amplitude-phase/time difference adjustment on the radio frequency signals generated by the signal generation module to generate a plurality of different coherent radio frequency signals.
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