Multi-scattering point radar target echo simulation method and device based on wide spectrum light source

Abstract

The application relates to a multi-scattering point radar target echo simulation method and device based on a wide-spectrum light source, wherein the method comprises the following steps: dividing the wide-spectrum light source through a polarizer into wide-spectrum light signals of an upper branch and wide-spectrum light signals of a lower branch; modulating radar signals on the wide-spectrum light signals of the upper branch through single sideband modulation with carrier suppression; regulating the amplitudes and phases of the wide-spectrum light signals of the lower branch to change the impulse response of a radar target simulator to be tested; combining the modulated wide-spectrum light signals of the upper branch and the regulated wide-spectrum light signals of the lower branch, and transmitting the combined light signals through a dispersion medium; and obtaining simulated radar target echo signals through photoelectric conversion to simulate the scattering characteristics of a radar target. Therefore, the problems that related technologies are difficult to process signals with large bandwidth, are restricted by storage depth and computing power, are difficult to realize modulation of complex scattering characteristics of signals with large bandwidth, and are difficult to simulate complex scattering characteristics of targets are solved.

Description

Technical Field

[0001] This application relates to the field of radar target simulation technology, and in particular to a method and apparatus for simulating radar target echoes from multiple scattering points based on a broadband light source. Background Technology

[0002] Radar emits electromagnetic signals of a specific frequency band and bandwidth to a target. The target scatters these signals, and the radar then detects the reflected signals to obtain the target's motion and scattering characteristics. Motion characteristics include the target's position and velocity. Based on the target's scattering characteristics, radar can acquire information such as the target's size and shape, and obtain two-dimensional and three-dimensional images, enabling precise target identification. Radar is continuously evolving towards higher frequencies and wider bandwidths. New radar systems, such as microwave photonic radar, can generate and process broadband signals on the order of 10 GHz, achieving high-resolution detection and imaging on the order of centimeters, thus obtaining more detailed information about the target's scattering characteristics.

[0003] In related technologies, current radar target simulators mainly have the following implementation schemes: 1. The scheme based on digital radio frequency storage (DRFM) can downconvert the radar signal and sample it into the digital domain for processing, and then generate radio frequency echo through digital-to-analog conversion; 2. The scheme based on mixer can directly modulate the received signal by utilizing the relationship between the delay and frequency shift of linear frequency modulation signal to generate simulated target echo; 3. The scheme based on fiber delay line can use the true delay of fiber to simulate the delay of target echo.

[0004] However, among related technologies, digital radio frequency storage-based solutions struggle to handle high-bandwidth signals and are limited by storage depth and computing power, making it difficult to modulate complex scattering characteristics of high-bandwidth signals; mixer-based solutions are only suitable for linear frequency modulated signals; and optical delay line-based solutions struggle to simulate the complex scattering characteristics of targets and urgently need improvement. Summary of the Invention

[0005] This application provides a method and apparatus for simulating radar target echoes from multiple scattering points based on a broadband light source, in order to solve the problems that related technologies are difficult to process large bandwidth signals and are limited by storage depth and computing power, making it difficult to modulate the complex scattering characteristics of large bandwidth signals and simulate the complex scattering characteristics of targets.

[0006] The first aspect of this application provides a method for simulating radar target echoes from multiple scattering points based on a broadband light source, comprising the following steps: dividing a broadband light source, after passing through a polarizer, into a broadband optical signal in an upper branch and a broadband optical signal in a lower branch; receiving a radar signal emitted by a radar under test, and modulating the radar signal onto the broadband optical signal in the upper branch using a suppressed carrier single-sideband modulation to obtain a modulated broadband optical signal in the upper branch; modulating the amplitude and phase of the broadband optical signal in the lower branch to change the impulse response of the radar target simulator under test, to obtain a modulated broadband optical signal in the lower branch; combining the modulated broadband optical signal in the upper branch and the modulated broadband optical signal in the lower branch to obtain a combined optical signal, and transmitting the combined optical signal through a dispersive medium to generate a final optical signal; converting the optical signal into a radio frequency signal through photoelectric conversion, and using the radio frequency signal as the radar target echo signal to simulate the scattering characteristics of the radar target.

[0007] Optionally, in one embodiment of this application, the amplitude and phase modulation of the broadband optical signal of the lower branch includes: obtaining a corresponding one-dimensional radar range profile based on the electromagnetic scattering characteristics of the radar under test at a preset rotation angle; obtaining a spectral modulation function based on the corresponding one-dimensional radar range profile; and modulating the amplitude and phase of the broadband optical signal of the lower branch based on the modulation function to obtain the modulated broadband optical signal of the lower branch.

[0008] Optionally, in one embodiment of this application, the calculation formula for the spectral modulation function is:

[0009] H(Ω)=A(Ω)exp(jΦ(Ω)),

[0010] Where A(Ω) and Φ(Ω) are the amplitude and phase of the optical signal with wavelength Ω, respectively.

[0011] Optionally, in one embodiment of this application, the step of using the radio frequency signal as a radar simulated target echo signal to simulate the scattering characteristics of a radar target includes: obtaining a two-dimensional imaging result based on the radar simulated target echo signal; and using the two-dimensional imaging result to simulate the scattering characteristics of the radar target.

[0012] Optionally, in one embodiment of this application, the calculation formula for the broadband light source is:

[0013]

[0014] Wherein, N(Ω) k ) represents the power spectrum of broadband noise, Φ k The wavelength is Ω k The initial phase corresponding to the optical signal.

[0015] A second aspect of this application provides a multi-scattering point radar target echo simulation device based on a broadband light source, comprising: a dividing module for dividing a broadband light source passing through a polarizer into a broadband optical signal of an upper branch and a broadband optical signal of a lower branch; an acquisition module for receiving a radar signal emitted by a radar under test and modulating the radar signal onto the broadband optical signal of the upper branch using a suppressed carrier single-sideband modulation to obtain a modulated broadband optical signal of the upper branch; a modulation module for modulating the amplitude and phase of the broadband optical signal of the lower branch to change the impulse response of the radar target simulator under test, thereby obtaining a modulated broadband optical signal of the lower branch; a combining module for combining the modulated broadband optical signal of the upper branch and the modulated broadband optical signal of the lower branch to obtain a combined optical signal, and transmitting the combined optical signal through a dispersive medium to generate a final optical signal; and a simulation module for converting the optical signal into a radio frequency signal through photoelectric conversion and using the radio frequency signal as a radar simulated target echo signal to simulate the scattering characteristics of the radar target.

[0016] Optionally, in one embodiment of this application, the control module includes: a first acquisition unit, configured to obtain a corresponding one-dimensional range profile of the radar under test based on the electromagnetic scattering characteristics of the radar under test at a preset rotation angle; and a control unit, configured to obtain a spectral control function based on the corresponding one-dimensional range profile of the radar, and to control the amplitude and phase of the broadband optical signal of the lower branch based on the control function to obtain the controlled broadband optical signal of the lower branch.

[0017] Optionally, in one embodiment of this application, the calculation formula for the spectral modulation function is:

[0018] H(Ω)=A(Ω)exp(jΦ(Ω)),

[0019] Where A(Ω) and Φ(Ω) are the amplitude and phase of the optical signal with wavelength Ω, respectively.

[0020] Optionally, in one embodiment of this application, the simulation module includes: a second acquisition unit, used to obtain a two-dimensional imaging result based on the radar simulated target echo signal; and a simulation unit, used to simulate the scattering characteristics of the radar target using the two-dimensional imaging result.

[0021] Optionally, in one embodiment of this application, the calculation formula for the broadband light source is:

[0022]

[0023] Wherein, N(Ω) k ) represents the power spectrum of broadband noise, Φ k The wavelength is Ωk The initial phase corresponding to the optical signal.

[0024] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the multi-scattering point radar target echo simulation method based on a broadband light source as described in the above embodiments.

[0025] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for simulating multi-scattering point radar target echoes based on a broadband light source.

[0026] This embodiment of the application can split a broadband light source into two paths. The received radar signal is modulated on the upper branch, and the lower branch uses a spectral processor to reconstruct the amplitude and phase of the entire spectrum. The two signals are combined and transmitted through a dispersive medium. After being converted into radio frequency signals by a photodetector, a simulated radar target echo is output, thereby realizing broadband echo simulation of multi-scattering point targets. This overcomes the bottleneck of existing solutions that are difficult to accurately simulate multi-scattering point echoes under broadband conditions, and also helps to accelerate the development and calibration of microwave photonic radar. Thus, it solves the problems of related technologies being unable to process large-bandwidth signals and being limited by storage depth and computing power, making it difficult to modulate complex scattering characteristics of large-bandwidth signals and simulate the complex scattering characteristics of targets.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0029] Figure 1 This is a flowchart of a method for simulating the echo of a multi-scattering radar target based on a broadband light source, according to an embodiment of this application.

[0030] Figure 2 This is a system schematic diagram of a multi-scattering point radar target echo simulation method based on a broadband light source according to an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of a one-dimensional range profile result according to an embodiment of the multi-scattering point radar target echo simulation method based on a broadband light source according to this application;

[0032] Figure 4This is a schematic diagram of a two-dimensional imaging result of a multi-scattering point radar target echo simulation method based on a broadband light source according to an embodiment of this application;

[0033] Figure 5 This is a schematic diagram of a multi-scattering point radar target echo simulation device based on a broadband light source, according to an embodiment of this application.

[0034] Figure 6 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of this application. Detailed Implementation

[0035] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0036] The following description, with reference to the accompanying drawings, describes a method and apparatus for simulating multi-scattering point radar target echoes based on a broadband light source, according to embodiments of this application. Addressing the problems mentioned in the background art, such as the difficulty in processing large-bandwidth signals and the limitations of storage depth and computing power in modulating complex scattering characteristics of large-bandwidth signals, making it difficult to simulate the complex scattering characteristics of targets, this application provides a method for simulating multi-scattering point radar target echoes based on a broadband light source. In this method, the broadband light source is divided into two paths. The received radar signal is modulated on the upper branch, and the lower branch uses a spectral processor to reconstruct the amplitude and phase of the entire spectrum. The two signals are combined and transmitted through a dispersive medium, converted into radio frequency signals by a photodetector, and then output as simulated radar target echoes. This achieves broadband echo simulation of multi-scattering point targets, overcoming the bottleneck of existing solutions' inability to accurately simulate multi-scattering point echoes in broadband conditions, and also helps to accelerate the development and calibration of microwave photonic radar. Therefore, this solves the problems of related technologies being unable to process large-bandwidth signals and being limited by storage depth and computing power, making it difficult to modulate complex scattering characteristics of large-bandwidth signals and simulate the complex scattering characteristics of targets.

[0037] Specifically, Figure 1 This is a flowchart illustrating a method for simulating the echo of a multi-scattering radar target based on a broadband light source, as provided in an embodiment of this application.

[0038] like Figure 1 As shown, the method for simulating radar target echoes from multiple scattering points based on broadband light sources includes the following steps:

[0039] In step S101, the broadband light source passing through the polarizer is divided into a broadband optical signal in the upper branch and a broadband optical signal in the lower branch.

[0040] In actual implementation, such as Figure 2 As shown, embodiments of this application may include: a broadband light source, an electro-optic modulator, a dispersive medium, a spectral processor, a tunable optical delay line, and a photodetector, wherein the bandwidth of the modulator is greater than the highest frequency of the signal to be processed. In this embodiment, the broadband light source first transmits the signal through a polarizer, then splits it into two paths: an upper branch broadband optical signal and a lower branch broadband optical signal. This provides support for subsequent targeted processing of the broadband optical signals on different branches, thereby achieving broadband echo simulation of multi-scattering point targets.

[0041] Optionally, in one embodiment of this application, the calculation formula for the broadband light source is:

[0042]

[0043] Wherein, N(Ω) k ) represents the power spectrum of broadband noise, Φ k The wavelength is Ω k The initial phase corresponding to the optical signal.

[0044] Specifically, in this application embodiment, a broadband light source can be considered as a collection of an infinite number of single-wavelength light sources, expressed as:

[0045]

[0046] According to the formula, the accuracy of the calculation can be improved, thereby accurately obtaining a broadband light source.

[0047] In step S102, the radar signal emitted by the radar under test is received, and the radar signal is modulated onto the broadband optical signal of the upper branch by suppressing the carrier single sideband to obtain the modulated broadband optical signal of the upper branch.

[0048] It is understood that the embodiments of this application can use a linear system to describe the scattering of radar signals by a target.

[0049] In actual implementation, the embodiments of this application can receive radar signals emitted by the radar under test, and modulate the received radar signals onto a broadband optical signal in the upper branch by suppressing the carrier single sideband, thereby obtaining the modulated broadband optical signal of the upper branch, which further provides support for realizing broadband echo simulation of multi-scattering point targets.

[0050] In step S103, the amplitude and phase of the broadband optical signal of the lower branch are modulated to change the impulse response of the radar target simulator under test, thereby obtaining the modulated broadband optical signal of the lower branch.

[0051] It is understood that the impulse response of the linear processing system for adjusting the radar signal in the embodiments of this application can simulate the scattering characteristics of the target.

[0052] As one possible approach, embodiments of this application can utilize a spectral processor to modulate the amplitude and phase of the broadband optical signal in the lower branch and adjust the tunable optical delay line to change the impulse response of the radar target simulator under test, thereby obtaining the modulated broadband optical signal in the lower branch, which further supports the realization of broadband echo simulation of multi-scattering point targets.

[0053] Furthermore, when in-band dispersion is neglected, the impulse response is:

[0054]

[0055] Where β2 is the second-order dispersion of the optical fiber, and f0 is the carrier frequency of the radar signal.

[0056] It is evident that the impulse response corresponds to the spectral modulation function.

[0057] Therefore, a spectral processing function can be used to adjust the impulse response of the system, thereby constructing different one-dimensional radar range profiles to simulate the scattering characteristics of the target. In the above equation, f0 is determined by the time delay difference τ between the upper and lower branches, where τ is adjusted using an optical delay line, expressed as:

[0058]

[0059] Adjust the delay line so that f0 is consistent with the center frequency of the radar signal.

[0060] This application embodiment modifies the system's impulse response by reasonably adjusting the spectral response function of the spectral processor and the delay difference between the two signals, thereby simulating the scattering characteristics of the target.

[0061] Optionally, in one embodiment of this application, amplitude and phase modulation of the broadband optical signal of the lower branch includes: obtaining a corresponding one-dimensional range profile of the radar based on the electromagnetic scattering characteristics of the radar under test at a preset rotation angle; obtaining a spectral modulation function based on the corresponding one-dimensional range profile of the radar; and modulating the amplitude and phase of the broadband optical signal of the lower branch based on the modulation function to obtain the modulated broadband optical signal of the lower branch.

[0062] It is understood that the preset rotation angle in the embodiments of this application can be different observation angles; the spectral adjustment function in the embodiments of this application is the spectral processing function.

[0063] In practical implementation, the embodiments of this application can process 8-12GHz radar signals. Based on electromagnetic scattering models or measured data, the electromagnetic scattering characteristics at a certain observation angle are simulated on a computer. The time-domain expression of the electromagnetic scattering characteristics corresponds to the one-dimensional range profile of the radar and also to the impulse response of the target simulation system. The corresponding one-dimensional range profile of the radar is converted into a spectral modulation function and sequentially input into the spectral processor to perform pulse compression on the simulated echo output by the system. The one-dimensional range profile of the radar is as follows: Figure 3 As shown, this application generates echoes from targets with complex scattering characteristics. Furthermore, embodiments of this application can modulate the amplitude and phase of the broadband optical signal of the lower branch according to a modulation function to obtain the modulated broadband optical signal of the lower branch, thereby simulating the echoes of targets at different rotation angles.

[0064] This application embodiment can perform pulse compression on the simulated echo output by the system, such as the radar one-dimensional range image. Figure 3 As shown, this application generates echoes from targets with complex scattering characteristics.

[0065] It should be noted that the preset rotation angle can be set by those skilled in the art according to the actual situation, and no specific restrictions are imposed here.

[0066] Optionally, in one embodiment of this application, the formula for calculating the spectral modulation function is:

[0067] H(Ω)=A(Ω)exp(jΦ(Ω)),

[0068] Where A(Ω) and Φ(Ω) are the amplitude and phase of the optical signal with wavelength Ω, respectively.

[0069] Specifically, the spectral processor in this application embodiment can introduce a spectral modulation function:

[0070] H(Ω)=A(Ω)exp(jΦ(Ω)),

[0071] According to the formula, the accuracy of the calculation is improved, which facilitates the subsequent simulation of the complex electromagnetic scattering characteristics of the target.

[0072] In step S104, the modulated broadband optical signal of the upper branch and the modulated broadband optical signal of the lower branch are combined to obtain a combined optical signal, and the combined optical signal is transmitted through a dispersive medium to generate the final optical signal.

[0073] It is understood that the final optical signal in the embodiments of this application can be a broadband optical signal after passing through a dispersive medium.

[0074] In actual implementation, the embodiments of this application can combine two signals, combining the modulated broadband optical signal of the upper branch and the modulated broadband optical signal of the lower branch to obtain a combined broadband optical signal, and then transmitting the combined broadband optical signal through a dispersion medium with a second-order dispersion coefficient of β2 to generate the final optical signal.

[0075] This application is applicable to testing the detection capabilities of new radar systems such as microwave photonic radar against targets with various scattering characteristics, and helps to accelerate the development and calibration of microwave photonic radar.

[0076] In step S105, the optical signal is converted into a radio frequency signal through photoelectric conversion, and the radio frequency signal is used as the radar simulated target echo signal to simulate the scattering characteristics of the radar target.

[0077] In actual implementation, the embodiments of this application can use a photodetector to convert optical signals into radio frequency signals through photoelectric conversion. The radio frequency signals are simulated radar target echo signals. The scattering characteristics of radar targets can be simulated by using simulated radar target echo signals.

[0078] The embodiments of this application can utilize the advantages of optoelectronic devices, such as large bandwidth and low transmission loss, to realize broadband echo simulation of multi-scattering point targets. Furthermore, based on the advantage of photonic technology that allows for parallel processing, a linear system in the optical domain can be constructed that can arbitrarily reconstruct the impulse response, thereby realizing the simulation of the complex electromagnetic scattering characteristics of the target. This overcomes the bottleneck of existing schemes that are difficult to achieve accurate simulation of multi-scattering point echoes in broadband conditions.

[0079] Optionally, in one embodiment of this application, a radio frequency signal is used as the radar simulated target echo signal to simulate the scattering characteristics of the radar target, including: obtaining a two-dimensional imaging result based on the radar simulated target echo signal; and simulating the scattering characteristics of the radar target using the two-dimensional imaging result.

[0080] In actual implementation, this embodiment can obtain simulated two-dimensional imaging results based on radar simulated target echo signals. The simulated two-dimensional imaging results are then used to simulate the scattering characteristics of the radar target. Based on the radar one-dimensional range image from multiple observation angles, this embodiment sequentially converts it into a spectral processing function, inputs it into a spectral processor, receives and processes multiple radar pulses output by the system, and uses the ISAR imaging algorithm to obtain the simulated target imaging result, i.e., the two-dimensional image. Figure 4 As shown, this application can accurately reconstruct the scattering characteristics of a target in the case of broadband.

[0081] The embodiments of this application can continuously change the impulse response of the system, so that the system can simulate radar echoes under multiple observation angles, which can test the imaging function of the radar under test, and thus simulate the complex scattering characteristics of the target.

[0082] The multi-scattering point radar target echo simulation method based on a broadband light source proposed in this application can divide the broadband light source into two paths. The received radar signal is modulated on the upper branch, and the lower branch uses a spectral processor to reconstruct the amplitude and phase of the entire spectrum. The two signals are combined and transmitted through a dispersive medium. After being converted into radio frequency signals by a photodetector, the simulated radar target echo is output, thereby realizing broadband echo simulation of multi-scattering point targets. This overcomes the bottleneck of existing schemes that are difficult to accurately simulate multi-scattering point echoes under broadband conditions, and also helps to accelerate the development and calibration of microwave photonic radar. Thus, it solves the problems of related technologies being unable to process large-bandwidth signals and being limited by storage depth and computing power, making it difficult to modulate complex scattering characteristics of large-bandwidth signals and simulate the complex scattering characteristics of targets.

[0083] Next, referring to the accompanying drawings, a multi-scattering point radar target echo simulation device based on a broadband light source, according to an embodiment of this application, is described.

[0084] Figure 5 This is a schematic diagram of the structure of a multi-scattering point radar target echo simulation device based on a broadband light source according to an embodiment of this application.

[0085] like Figure 5 As shown, the multi-scattering point radar target echo simulation device 10 based on broadband light source includes: a division module 100, an acquisition module 200, a control module 300, a combining module 400, and a simulation module 500.

[0086] Specifically, the dividing module 100 is used to divide the broadband light source after passing through the polarizer into a broadband optical signal of the upper branch and a broadband optical signal of the lower branch.

[0087] The acquisition module 200 is used to receive the radar signal emitted by the radar under test, and modulate the radar signal onto the broadband optical signal of the upper branch by suppressing the carrier single sideband, so as to obtain the modulated broadband optical signal of the upper branch.

[0088] The modulation module 300 is used to modulate the amplitude and phase of the broadband optical signal of the lower branch to change the impulse response of the radar target simulator under test, and obtain the modulated broadband optical signal of the lower branch.

[0089] The combiner module 400 is used to combine the modulated broadband optical signal of the upper branch and the modulated broadband optical signal of the lower branch to obtain the combined optical signal, and then transmit the combined optical signal through the dispersive medium to generate the final optical signal.

[0090] The analog module 500 is used to convert optical signals into radio frequency signals through photoelectric conversion, and use the radio frequency signals as radar simulated target echo signals to simulate the scattering characteristics of radar targets.

[0091] Optionally, in one embodiment of this application, the control module 300 includes: a first acquisition unit and a control unit.

[0092] The first acquisition unit is used to obtain the corresponding one-dimensional range profile of the radar based on the electromagnetic scattering characteristics of the radar under test at a preset rotation angle.

[0093] The control unit is used to obtain the spectral control function based on the corresponding one-dimensional radar range image, and to control the amplitude and phase of the broadband optical signal of the lower branch according to the control function, so as to obtain the controlled broadband optical signal of the lower branch.

[0094] Optionally, in one embodiment of this application, the formula for calculating the spectral modulation function is:

[0095] H(Ω)=A(Ω)exp(jΦ(Ω)),

[0096] Where A(Ω) and Φ(Ω) are the amplitude and phase of the optical signal with wavelength Ω, respectively.

[0097] Optionally, in one embodiment of this application, the simulation module 500 includes a second acquisition unit and a simulation unit.

[0098] The second acquisition unit is used to obtain two-dimensional imaging results based on radar simulated target echo signals.

[0099] The simulation unit is used to simulate the scattering characteristics of radar targets using two-dimensional imaging results.

[0100] Optionally, in one embodiment of this application, the calculation formula for the broadband light source is:

[0101]

[0102] Wherein, N(Ω) k ) represents the power spectrum of broadband noise, Φ k The wavelength is Ω k The initial phase corresponding to the optical signal.

[0103] It should be noted that the foregoing explanation of the embodiment of the multi-scattering point radar target echo simulation method based on broadband light source also applies to the multi-scattering point radar target echo simulation device based on broadband light source in this embodiment, and will not be repeated here.

[0104] The multi-scattering point radar target echo simulation device based on a broadband light source proposed in this application can split the broadband light source into two paths. The received radar signal is modulated on the upper branch, and the lower branch uses a spectral processor to reconstruct the amplitude and phase of the entire spectrum. The two signals are combined and transmitted through a dispersive medium. After being converted into radio frequency signals by a photodetector, the simulated radar target echo is output, thereby realizing broadband echo simulation of multi-scattering point targets. This overcomes the bottleneck of existing solutions that are difficult to accurately simulate multi-scattering point echoes under broadband conditions, and also helps to accelerate the development and calibration of microwave photonic radar. Thus, it solves the problems of related technologies being unable to process large-bandwidth signals and being limited by storage depth and computing power, making it difficult to modulate complex scattering characteristics of large-bandwidth signals and simulate the complex scattering characteristics of targets.

[0105] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include:

[0106] The memory 601, the processor 602, and the computer program stored on the memory 601 and capable of running on the processor 602.

[0107] When the processor 602 executes the program, it implements the multi-scattering point radar target echo simulation method based on broadband light source provided in the above embodiments.

[0108] Furthermore, electronic devices also include:

[0109] Communication interface 603 is used for communication between memory 601 and processor 602.

[0110] The memory 601 is used to store computer programs that can run on the processor 602.

[0111] The memory 601 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0112] If the memory 601, processor 602, and communication interface 603 are implemented independently, then the communication interface 603, memory 601, and processor 602 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0113] Optionally, in a specific implementation, if the memory 601, processor 602, and communication interface 603 are integrated on a single chip, then the memory 601, processor 602, and communication interface 603 can communicate with each other through an internal interface.

[0114] The processor 602 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0115] This embodiment also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for simulating the echo of a multi-scattering radar target based on a broadband light source.

[0116] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0117] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0118] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0119] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0120] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0121] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0122] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0123] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A method for simulating radar target echoes from multiple scattering points based on a broadband light source, characterized in that, Includes the following steps: The broadband light source passing through the polarizer is divided into a broadband optical signal in the upper branch and a broadband optical signal in the lower branch; Receive the radar signal emitted by the radar under test, and modulate the radar signal onto the broadband optical signal of the upper branch by suppressing carrier single sideband, to obtain the modulated broadband optical signal of the upper branch; The amplitude and phase of the broadband optical signal of the lower branch are modulated to change the impulse response of the radar target simulator under test, thereby obtaining the modulated broadband optical signal of the lower branch. The modulated broadband optical signal of the upper branch and the modulated broadband optical signal of the lower branch are combined to obtain a combined optical signal, and the combined optical signal is transmitted through a dispersive medium to generate the final optical signal. The optical signal is converted into a radio frequency signal through photoelectric conversion, and the radio frequency signal is used as the radar simulated target echo signal to simulate the scattering characteristics of the radar target; The amplitude and phase modulation of the broadband optical signal of the lower branch includes: Based on the electromagnetic scattering characteristics of the radar under test at a preset rotation angle, the corresponding one-dimensional range profile of the radar is obtained. The spectral modulation function is obtained based on the corresponding one-dimensional radar range profile, and the amplitude and phase of the broadband optical signal of the lower branch are modulated according to the modulation function to obtain the modulated broadband optical signal of the lower branch. The formula for calculating the spectral modulation function is as follows: ， in, and The wavelengths are respectively The amplitude and phase of the optical signal.

2. The method according to claim 1, characterized in that, The step of using the radio frequency signal as the radar simulated target echo signal to simulate the scattering characteristics of the radar target includes: Two-dimensional imaging results are obtained based on the radar simulated target echo signal; The scattering characteristics of the radar target are simulated using the two-dimensional imaging results.

3. The method according to claim 1, characterized in that, The calculation formula for the broadband light source is: ， in, The power spectrum of broadband noise. For wavelength The initial phase corresponding to the optical signal.

4. A multi-scattering point radar target echo simulation device based on a broadband light source, characterized in that, The method for simulating radar target echoes based on broadband light sources as described in any one of claims 1-3 includes: The segmentation module is used to divide the broadband light source after passing through the polarizer into a broadband optical signal of the upper branch and a broadband optical signal of the lower branch; The acquisition module is used to receive the radar signal emitted by the radar under test, and modulate the radar signal onto the broadband optical signal of the upper branch by suppressing carrier single sideband, so as to obtain the modulated broadband optical signal of the upper branch. The modulation module is used to modulate the amplitude and phase of the broadband optical signal of the lower branch to change the impulse response of the radar target simulator under test, and obtain the modulated broadband optical signal of the lower branch. The combining module is used to combine the modulated broadband optical signal of the upper branch and the modulated broadband optical signal of the lower branch to obtain the combined optical signal, and transmit the combined optical signal through the dispersive medium to generate the final optical signal. The simulation module is used to convert the optical signal into a radio frequency signal through photoelectric conversion, and use the radio frequency signal as the radar simulated target echo signal to simulate the scattering characteristics of the radar target.

5. The apparatus according to claim 4, characterized in that, The control module includes: The acquisition unit is used to obtain the corresponding one-dimensional range profile of the radar based on the electromagnetic scattering characteristics of the radar under test at a preset rotation angle. The control unit is used to obtain a spectral control function based on the corresponding one-dimensional radar range image, and to control the amplitude and phase of the broadband optical signal of the lower branch according to the control function, so as to obtain the controlled broadband optical signal of the lower branch.

6. The apparatus according to claim 5, characterized in that, The formula for calculating the spectral modulation function is as follows: ， in, and The wavelengths are respectively The amplitude and phase of the optical signal.

7. An electronic device, characterized in that, include: The memory, the processor, and the computer program stored in the memory and executable on the processor, the processor executing the program to implement the method for simulating the echo of a multi-scattering point radar target based on a broadband light source as described in any one of claims 1-3.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the method for simulating the echo of a multi-scattering radar target based on a broadband light source as described in any one of claims 1-3.

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