CN116755050A - Electromagnetic environment simulation method, device and medium - Google Patents
Electromagnetic environment simulation method, device and medium Download PDFInfo
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Abstract
The embodiment of the specification discloses an electromagnetic environment simulation method, equipment and medium, and relates to the technical field of radars, wherein the method comprises the following steps: acquiring initialization parameters and control instructions based on the main control unit, carrying out parameter configuration on preset equipment according to the initialization parameters, and carrying out workflow control on the preset equipment based on the control instructions; receiving radar emission signals based on an echo simulation unit, correcting the radar emission signals according to the distance between a preset target and a preset platform to obtain target signals, acquiring interference signals, and superposing the interference signals and the target signals to obtain 64 paths of echo signals; converting the 64 paths of echo signals into intermediate frequency echo signals by adopting a preset digital-analog converter, and connecting the intermediate frequency echo signals to a preset intermediate frequency conversion unit; based on the intermediate frequency conversion unit, the intermediate frequency echo signals are subjected to frequency conversion treatment and then output to the signal processor. The single-point target simulation capability is improved, and the simulation scene is more stereoscopic and real.
Description
Technical Field
The present disclosure relates to the field of radar technologies, and in particular, to an electromagnetic environment simulation method, apparatus, and medium.
Background
The signal processor of the radar is the most critical component in the whole radar system, and the performance of the radar is directly determined by the performance of the signal processor. With the current increasing intensity of radar electronics, the requirements on the target recognition, classification and anti-interference capabilities of signal processors are increasing. However, it is very difficult to provide a simulation test environment for a signal processor (particularly a multi-channel signal processor) that approximates a real scene.
Therefore, the current test of the signal processor mostly adopts a hardware interface test and a simple scene test. The performance of the signal processor mostly needs to be verified in a radar system, and as the radar system is complex, after various factors in the system are inter-modulated, the problem is difficult to judge, so that the problem solving time in the radar development process is long, and the overall development period is long.
Due to difficulty in multi-channel signal consistency simulation and complex scene construction, the existing scheme usually avoids the multi-channel signal consistency simulation and complex scene construction, and a digital signal simulation method and an analog signal power division phase shift method are used.
The digital signal analog method skips the multi-channel synchronous ADC part of the signal processor, and the signal processor loses the space domain processing capability. In general, radar performs target detection and countermeasure through a time domain, a frequency domain and a space domain, and after the analysis capability of the space domain dimension is lost, the detection, identification and anti-interference capability of the space domain cannot be verified, and an advanced intelligent algorithm cannot be verified.
The analog signal power division phase shift method is to perform angle simulation among multiple channels by the fixed phase characteristic of the power divider matched with the phase shifter at the rear end. The problem is that the echoes of complex targets or complex scenes are superimposed in the time domain, but the directions of different targets, different interferences and different clutters in the scene are different. After the phase of different channels is shifted, all angle information in the channels is fixed. In complex scenarios, this approach also loses the ability to simulate airspace.
Cn_106597398_a discloses an echo analog system of a digital signal processor. The industrial personal computer and the signal processor are connected through the PCI bus to realize the simulation of echo signals. However, this method skips the multi-channel synchronous ADC part of the signal processor, and cannot simulate the spatial domain dimension characteristic for the signal processor. The detection, identification and anti-interference capability of the airspace cannot be verified.
Cn_111123230_b discloses a simple target echo simulation system simulating a multi-channel signal processor. According to the method, one path of intermediate frequency echo signals are divided into multiple paths of intermediate frequency signals through power division, and each intermediate frequency signal after power division is subjected to switching, amplifying and phase shifting, so that the spatial characteristics of a single target can be simulated. However, this method can only reduce the target to one point, and details of the target (including size, shape, different angular velocities, etc.) are actually discarded, so that the simulated echo signal is not real. And background clutter and interference signals in the existing environment cannot be simulated at the same time. It is also difficult to achieve the requirements for efficient verification of the capabilities of the signal processor.
Disclosure of Invention
One or more embodiments of the present disclosure provide an electromagnetic environment simulation method, apparatus, and medium for solving the following technical problems: in the prior art, when a signal processor of a radar is tested, a real and complex environment cannot be simulated.
One or more embodiments of the present disclosure adopt the following technical solutions:
one or more embodiments of the present specification provide an electromagnetic environment simulation method, the method comprising:
acquiring initialization parameters and control instructions based on a main control unit, carrying out parameter configuration on preset equipment according to the initialization parameters, and carrying out workflow control on the preset equipment based on the control instructions;
receiving radar emission signals based on an echo simulation unit, and correcting the radar emission signals according to the distance between a preset target and a preset platform to obtain target signals;
obtaining an interference signal, and superposing the interference signal and the target signal to obtain 64 paths of echo signals;
converting the 64 paths of echo signals into intermediate frequency echo signals by adopting a preset digital-analog converter, and connecting the intermediate frequency echo signals into a preset intermediate frequency conversion unit;
and based on the intermediate frequency conversion unit, the intermediate frequency echo signal is subjected to frequency conversion treatment and then is output to a signal processor.
Further, the correcting the radar emission signal according to the distance between the preset target and the preset platform to obtain a target signal includes:
according to the radial distance between the preset target and the preset platform, carrying out delay processing on the radar emission signal to obtain a current wave beam;
calculating a target angle between the preset platform and the preset target according to the direction of the current wave beam and the radial distance between the preset target and the preset platform;
searching the scattering area and the pattern antenna gain of each scattering point of the preset target according to the target angle;
and obtaining the 64 paths of echo signals according to the scattering area and the directional pattern antenna gain.
Further, the obtaining the interference signal and superposing the interference signal and the target signal to obtain 64 paths of echo signals includes:
simulating according to the interference parameters to obtain echo signals and interference signals;
and superposing the interference signal and the target signal to obtain 64 paths of echo signals.
Further, searching the scattering area and the pattern antenna gain of each scattering point of the preset target according to the target angle specifically includes:
64 paths of 1000-point one-dimensional range profile targets are simulated through time domain convolution.
Further, the 64 paths of 1000-point one-dimensional range profile targets are simulated through time domain convolution, and the method specifically comprises the following steps:
vector synthesis of point target echo signals corresponding to a plurality of strong scattering centers on the range profile is used as an echo of a range expansion target;
and acquiring a one-dimensional range profile of the target multi-scattering center and the projection distribution of the echo signal energy of the target multi-scattering center on the radial distance axis as the target.
Further, the method specifically comprises the following steps:
acquiring delay, amplitude, phase and other information of echoes of all scattering points in a beam irradiation range;
the superposition of all scattering point information falling into the range gate represented by a certain sampling instant is made as an echo system function at that instant.
Further, the method further comprises the following steps:
a DAC chip compliant with JESD204B subs lass1 protocol is used.
Further, the method further comprises the following steps:
when SYSREF is a periodic or intermittent periodic signal, setting Clock homology and SYSREF homology;
performing delay matching on all Clock signal wires and SYSREF signal wires;
each SERDES link is delay matched.
One or more embodiments of the present specification provide an electromagnetic environment simulation apparatus including:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the memory stores instructions executable by the at least one processor to enable the at least one processor to:
acquiring initialization parameters and control instructions based on a main control unit, carrying out parameter configuration on preset equipment according to the initialization parameters, and carrying out workflow control on the preset equipment based on the control instructions;
receiving radar emission signals based on an echo simulation unit, and correcting the radar emission signals according to the distance between a preset target and a preset platform to obtain target signals;
obtaining an interference signal, and superposing the interference signal and the target signal to obtain 64 paths of echo signals;
converting the 64 paths of echo signals into intermediate frequency echo signals by adopting a preset digital-analog converter, and connecting the intermediate frequency echo signals into a preset intermediate frequency conversion unit;
and based on the intermediate frequency conversion unit, the intermediate frequency echo signal is subjected to frequency conversion treatment and then is output to a signal processor.
One or more embodiments of the present specification provide a non-volatile computer storage medium storing computer-executable instructions configured to:
acquiring initialization parameters and control instructions based on a main control unit, carrying out parameter configuration on preset equipment according to the initialization parameters, and carrying out workflow control on the preset equipment based on the control instructions;
receiving radar emission signals based on an echo simulation unit, and correcting the radar emission signals according to the distance between a preset target and a preset platform to obtain target signals;
obtaining an interference signal, and superposing the interference signal and the target signal to obtain 64 paths of echo signals;
converting the 64 paths of echo signals into intermediate frequency echo signals by adopting a preset digital-analog converter, and connecting the intermediate frequency echo signals into a preset intermediate frequency conversion unit;
and based on the intermediate frequency conversion unit, the intermediate frequency echo signal is subjected to frequency conversion treatment and then is output to a signal processor.
The above-mentioned at least one technical scheme that this description embodiment adopted can reach following beneficial effect: the multi-channel intermediate frequency echo simulation is carried out by simulating 64 paths of DACs, so that the angle information of each target can be digitally simulated before the DACs and then played by the 64 paths of DACs after digital superposition. Therefore, the system has the simulation capability of 1000-point complex targets or clutter scenes, and the single-point target simulation capability is improved. And the background noise and the enemy interference signals can be overlapped in the scene at the same time, so that the simulated scene is more stereoscopic and real.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some of the embodiments described in the present description, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
fig. 1 is a schematic flow chart of an electromagnetic environment simulation method according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of an electromagnetic environment simulation device according to an embodiment of the present disclosure;
FIG. 3 is a functional block diagram of an electromagnetic environment simulation device according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of one-dimensional range profile object echo formation according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a device workflow provided in an embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions in the present specification better understood by those skilled in the art, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only some embodiments of the present specification, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present disclosure.
The embodiment of the present disclosure provides an electromagnetic environment simulation method, and it should be noted that the execution subject in the embodiment of the present disclosure may be a server, or may be any device having data processing capability.
The invention relates to a multichannel synchronous DAC principle, and the basis of multichannel DCA synchronization is to select DAC chips conforming to JESD204B SUBCLASS1 protocol. Supglass 1: the deterministic delay is supported by a system reference signal known as SYSREF, which is suitable for sampling rates above 500 MHz.
JESD204B subs lass1 uses the SYSEF signal as a synchronization reference signal for TX and RX devices. SYSREF is a source synchronous with CLK, and deterministic delay between TX and RX devices can be achieved when the on-chip LMFC is aligned with the CLK edge when SYSREF is high. If the deterministic delay for each TX to RX link in the device is the same, multi-channel synchronization can be achieved.
JESD204B sub 1 uses the SYSREF signal as a synchronization reference signal for TX and RX devices. The SYSREF signal is a source that is synchronized to the CLK clock, either a single pulse signal or a periodic signal, which achieves deterministic delays between the TX and RX devices when the on-chip LMFC is aligned with the CLK edge when the SYSREF is high. If the deterministic delay for each TX to RX link in the device is the same, multi-channel synchronization can be achieved.
According to the synchronization mechanism of JESD204B, in order to achieve synchronization, the following design is performed;
1) All Clock homologies, SYSREF homologies, especially when SYSREF is a periodic or intermittent periodic signal;
2) All Clock, SYSREF signal wires are subjected to delay matching;
3) Each SERDES link is delay matched.
Fig. 1 is a schematic flow chart of an electromagnetic environment simulation method provided in an embodiment of the present disclosure, as shown in fig. 1, the method mainly includes the following steps:
step S101, an initialization parameter and a control instruction are obtained based on a main control unit, parameter configuration is carried out on preset equipment according to the initialization parameter, and workflow control is carried out on the preset equipment based on the control instruction.
Referring to fig. 5, after the operation starts, the device reads the local initialization parameters through the main control software and configures the initialization parameters for all software and hardware in the device; after the initialization is finished, the device performs system self-checking including hardware state checking and channel closed-loop detection; and if the self-checking result is abnormal, recording an abnormal state, displaying an abnormal warning on the UI interface, and restarting the initialization flow. If the self-checking result is normal, entering a normal working flow; the device edits a target model, interference parameters and a background model file sent by the database; the device acquires working parameters and echo data set by a user through a main control software UI interface; after entering the normal test flow, the device determines that the current working mode is the working mode.
Step S102, receiving radar emission signals based on an echo simulation unit, and correcting the radar emission signals according to the distance between a preset target and a preset platform to obtain target signals.
Referring to fig. 5, after the device is started, echo signal simulation is performed according to the current parameters. After receiving a main control instruction in the working process, updating working parameters, and receiving beam pointing, synchronous pulse and frame signals to perform echo calculation and simulation until receiving a stop instruction; after receiving the stopping instruction, the device reads the recorded test process data into the main control software; the device analyzes the read test process data, and ends the test flow after judging whether the test is qualified.
Step S103, obtaining an interference signal, and superposing the interference signal and the target signal to obtain 64 paths of echo signals;
step S104, converting the 64 paths of echo signals into intermediate frequency echo signals by adopting a preset digital-to-analog converter, and connecting the intermediate frequency echo signals into a preset intermediate frequency conversion unit;
step S105, based on the intermediate frequency conversion unit, performing frequency conversion processing on the intermediate frequency echo signal, and outputting the result to a signal processor.
The invention relates to body target simulation, and according to the theory of multiple scattering centers, backward scattering echoes of a complex target in an optical zone can be equivalently synthesized by all scattering center echoes on a target object, and vector synthesis of point target echo signals corresponding to multiple strong scattering centers on a range profile can be used as echoes of a range expansion target. The projection distribution of the target multi-scattering center and the echo signal energy thereof on the radial distance axis is called a one-dimensional range profile of the target, and reflects important characteristics such as the length, the geometric structure and the like of the target.
The process of forming the one-dimensional range profile object echo is shown in fig. 4.
Based on the formation principle of the echo signal of the one-dimensional range profile expansion target, each resolution unit can be regarded as an independent point target, and the duration of the echo is pulse widthEcho time delay of adjacent resolution unit is +.>，/>For a radar distance resolution unit, c is the propagation velocity of an electromagnetic wave in free space.
The complex form of the radar transmit signal is:
is provided with、/>、/>And->Sequentially the echo time delay, the radial distance, the RCS and the Doppler frequency of the ith target resolution unit, G is the gain of a transmitting antenna, and lambda is the wavelength, and then the echo signal of the ith target resolution unit is:
the total echo signal is:
consider the following factors:
the radar transmitting signal power is kept unchanged in the pulse;
the target size is small relative to the distance from the radar to the target, and the attenuation difference of each target resolution unit due to the distance is negligible;
the target size is small relative to the distance from the radar to the target, and the Doppler frequencies of the target resolution units are approximately the same in radial arrangement.
The echo signal can be written as:
will beRecorded as amplitude modulation factor, ">As a result of the doppler modulation factor,is denoted as the target RCS modulation factor, wherein +.>For radar transmit power, < >>For the radial distance of the target to the radar, +.>Is the doppler frequency.
From the above, it can be seen that the target echo is the superposition of all scattering point echoes within the radar illumination beam, which can be seen as the output of the radar transmit signal after it has passed through a system. The target echo can thus be expressed as a convolution of the radar transmit pulse s (t) with the target echo system function (impulse response sequence) h (t), i.e.
The system function in the above equation contains information such as delay, amplitude and phase of echoes of all scattering points in the beam irradiation range, and at this time, the echo system function at a certain sampling time (representing different equidistant rings) will be superposition of information of all scattering points falling into the range gate represented by the time.
Principle of fraud jamming
V is the detection space of the radar for various targets, and for the radar with four-dimensional (distance, azimuth, elevation and speed) detection capability, V can be expressed as
V={，/>，}
Wherein, the liquid crystal display device comprises a liquid crystal display device,、/>、/>、/>、/>the radar detection method comprises the steps of respectively detecting the minimum and maximum detection distance, the minimum and maximum detection azimuth, the minimum and maximum detection elevation, the minimum and maximum detection Doppler frequency, the minimum detection signal power and the saturation signal power of the radar. The ideal point target T determines a point for only one of V: />
In the middle ofThe distance, azimuth, elevation, doppler frequency and echo power of the target are respectively. The radar is able to distinguish between two different point targets in V +.>Is the spatial resolution of the radar:
R，/>,/>}
in the middle ofRespectively known as range resolution, azimuth resolution, elevation resolution and speed resolution of the radar. In general, radar has no resolution in energy, and therefore, the resolution of energy is the same as the detection range.
Under general conditions, decoys formed by fraudulent interferenceAlso a set of certain points in V, which are different from the real target T, i.e. +.>
Principle of angular reversal
The corner reflector is formed by adding a metal reflecting surface to a partial surface of the luneberg lens. The Robert lens is a dielectric sphere with a refractive index n varying with a radius r, i.e
Where a is the outer radius of the lens. A luneberg lens with such a refractive index can collect the plane electromagnetic waves incident on the lens to a point and then radiate this point source as a plane wave.
The Roberts lens has 90 DEG, 140 DEG and 180 DEG reflection according to the size of the added metal reflecting surfaceAnd their beamwidths are also 90 °, 140 ° and 180 °, respectively. When (when)When the effective reflection area of the luneberg lens is
According to the technical scheme, the multichannel intermediate-frequency echo simulation is performed through the analog 64-channel DAC, so that the angle information of each target can be digitally simulated before the DAC, and then played through the 64-channel DAC after digital superposition. Therefore, the system has the simulation capability of 1000-point complex targets or clutter scenes, and is improved by 1000 times compared with the original single-point target simulation capability. And the background noise and the enemy interference signals can be overlapped in the scene at the same time, so that the simulated scene is more stereoscopic and real.
The embodiment of the present disclosure further provides a radio frequency echo signal simulation device, as shown in fig. 2, where the device includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
acquiring initialization parameters and control instructions based on a main control unit, carrying out parameter configuration on preset equipment according to the initialization parameters, and carrying out workflow control on the preset equipment based on the control instructions;
receiving radar emission signals based on an echo simulation unit, and correcting the radar emission signals according to the distance between a preset target and a preset platform to obtain target signals;
obtaining an interference signal, and superposing the interference signal and the target signal to obtain 64 paths of echo signals;
converting the 64 paths of echo signals into intermediate frequency echo signals by adopting a preset digital-analog converter, and connecting the intermediate frequency echo signals into a preset intermediate frequency conversion unit;
and based on the intermediate frequency conversion unit, the intermediate frequency echo signal is subjected to frequency conversion treatment and then is output to a signal processor.
The present specification embodiments also provide a non-volatile computer storage medium storing computer-executable instructions configured to:
acquiring initialization parameters and control instructions based on a main control unit, carrying out parameter configuration on preset equipment according to the initialization parameters, and carrying out workflow control on the preset equipment based on the control instructions;
receiving radar emission signals based on an echo simulation unit, and correcting the radar emission signals according to the distance between a preset target and a preset platform to obtain target signals;
obtaining an interference signal, and superposing the interference signal and the target signal to obtain 64 paths of echo signals;
converting the 64 paths of echo signals into intermediate frequency echo signals by adopting a preset digital-analog converter, and connecting the intermediate frequency echo signals into a preset intermediate frequency conversion unit;
and based on the intermediate frequency conversion unit, the intermediate frequency echo signal is subjected to frequency conversion treatment and then is output to a signal processor.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for apparatus, devices, non-volatile computer storage medium embodiments, the description is relatively simple, as it is substantially similar to method embodiments, with reference to the section of the method embodiments being relevant.
The foregoing describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
The devices and media provided in the embodiments of the present disclosure are in one-to-one correspondence with the methods, so that the devices and media also have similar beneficial technical effects as the corresponding methods, and since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the devices and media are not repeated here.
It will be appreciated by those skilled in the art that embodiments of the present description may be provided as a method, system, or computer program product. Accordingly, the present specification may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present description can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
The present description is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the specification. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The foregoing is merely one or more embodiments of the present description and is not intended to limit the present description. Various modifications and alterations to one or more embodiments of this description will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of one or more embodiments of the present description, is intended to be included within the scope of the claims of the present description.
Claims (10)
1. A method of simulating an electromagnetic environment, the method comprising:
acquiring initialization parameters and control instructions based on a main control unit, carrying out parameter configuration on preset equipment according to the initialization parameters, and carrying out workflow control on the preset equipment based on the control instructions;
receiving radar emission signals based on an echo simulation unit, and correcting the radar emission signals according to the distance between a preset target and a preset platform to obtain target signals;
obtaining an interference signal, and superposing the interference signal and the target signal to obtain 64 paths of echo signals;
converting the 64 paths of echo signals into intermediate frequency echo signals by adopting a preset digital-analog converter, and connecting the intermediate frequency echo signals into a preset intermediate frequency conversion unit;
and based on the intermediate frequency conversion unit, the intermediate frequency echo signal is subjected to frequency conversion treatment and then is output to a signal processor.
2. The electromagnetic environment simulation method according to claim 1, wherein the correcting the radar emission signal according to the distance between the preset target and the preset platform to obtain the target signal includes:
according to the radial distance between the preset target and the preset platform, carrying out delay processing on the radar emission signal to obtain a current wave beam;
calculating a target angle between the preset platform and the preset target according to the direction of the current wave beam and the radial distance between the preset target and the preset platform;
searching the scattering area and the pattern antenna gain of each scattering point of the preset target according to the target angle;
and obtaining the 64 paths of echo signals according to the scattering area and the directional pattern antenna gain.
3. The electromagnetic environment simulation method according to claim 2, wherein the obtaining the interference signal and superposing the interference signal and the target signal to obtain 64 echo signals includes:
simulating according to the interference parameters to obtain echo signals and interference signals;
and superposing the interference signal and the target signal to obtain 64 paths of echo signals.
4. The electromagnetic environment simulation method according to claim 2, wherein the searching for the scattering area and the pattern antenna gain of each scattering point of the preset target according to the target angle specifically comprises:
64 paths of 1000-point one-dimensional range profile targets are simulated through time domain convolution.
5. The electromagnetic environment simulation method according to claim 2, wherein the 64-path 1000-point one-dimensional range profile target is simulated by time domain convolution, specifically comprising:
vector synthesis of point target echo signals corresponding to a plurality of strong scattering centers on the range profile is used as an echo of a range expansion target;
and acquiring a one-dimensional range profile of the target multi-scattering center and the projection distribution of the echo signal energy of the target multi-scattering center on the radial distance axis as the target.
6. The electromagnetic environment simulation method according to claim 5, wherein the vector synthesis of the echo signals of the point targets corresponding to the plurality of strong scattering centers on the range profile is performed as the echo of the range expansion target, comprising:
acquiring delay, amplitude, phase and other information of echoes of all scattering points in a beam irradiation range;
the superposition of all scattering point information falling into the range gate represented by a certain sampling instant is made as an echo system function at that instant.
7. The method of claim 6, further comprising:
a DAC chip compliant with JESD204B subs lass1 protocol is used.
8. The method of claim 6, further comprising:
when SYSREF is a periodic or intermittent periodic signal, setting Clock homology and SYSREF homology;
performing delay matching on all Clock and SYSREF signal wires;
and performing delay matching on each SERDES link.
9. An electromagnetic environment simulation apparatus, the apparatus comprising:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the memory stores instructions executable by the at least one processor to enable the at least one processor to:
acquiring initialization parameters and control instructions based on a main control unit, carrying out parameter configuration on preset equipment according to the initialization parameters, and carrying out workflow control on the preset equipment based on the control instructions;
receiving radar emission signals based on an echo simulation unit, and correcting the radar emission signals according to the distance between a preset target and a preset platform to obtain target signals;
obtaining an interference signal, and superposing the interference signal and the target signal to obtain 64 paths of echo signals;
converting the 64 paths of echo signals into intermediate frequency echo signals by adopting a preset digital-analog converter, and connecting the intermediate frequency echo signals into a preset intermediate frequency conversion unit;
and based on the intermediate frequency conversion unit, the intermediate frequency echo signal is subjected to frequency conversion treatment and then is output to a signal processor.
10. A non-transitory computer storage medium storing computer-executable instructions, the computer-executable instructions configured to:
acquiring initialization parameters and control instructions based on a main control unit, carrying out parameter configuration on preset equipment according to the initialization parameters, and carrying out workflow control on the preset equipment based on the control instructions;
receiving radar emission signals based on an echo simulation unit, and correcting the radar emission signals according to the distance between a preset target and a preset platform to obtain target signals;
obtaining an interference signal, and superposing the interference signal and the target signal to obtain 64 paths of echo signals;
converting the 64 paths of echo signals into intermediate frequency echo signals by adopting a preset digital-analog converter, and connecting the intermediate frequency echo signals into a preset intermediate frequency conversion unit;
and based on the intermediate frequency conversion unit, the intermediate frequency echo signal is subjected to frequency conversion treatment and then is output to a signal processor.
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