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

Abstract

The invention relates to a multi-scattering-point radar target echo simulation method and device based on a wide-spectrum light source, and the method comprises the steps: dividing the wide-spectrum light source passing through a polarizer into a wide-spectrum light signal of an upper branch and a wide-spectrum light signal of a lower branch; modulating a radar signal on a wide-spectrum optical signal of an upper branch by suppressing a carrier single side band; performing amplitude and phase regulation and control on the wide-spectrum optical signal of the lower branch so as to change the impulse response of the radar target simulator to be tested; combining the modulated wide-spectrum optical signal of the upper branch and the regulated wide-spectrum optical signal of the lower branch, and transmitting the combined optical signal to pass through a dispersive medium; and a simulated radar target echo signal is obtained through photoelectric conversion so as to simulate the scattering characteristic of the radar target. Therefore, the problems that large-bandwidth signals are difficult to process in related technologies, modulation of complex scattering characteristics of the large-bandwidth signals is difficult to achieve, and the complex scattering characteristics of a target are difficult to simulate due to the fact that the related technologies are limited by storage depth and computing power are solved.

Description

Technical Field

[0001] The present application relates to the technical field of radar target simulation, and in particular to a method and device for simulating multi-scattering point radar target echoes based on a wide-spectrum light source. Background Art

[0002] The radar transmits an electromagnetic signal of a certain frequency band and bandwidth to the target, and the target scatters the electromagnetic signal. The radar then obtains the target's motion characteristics and scattering characteristics by detecting the electromagnetic signal scattered back by the target. The motion characteristics include information such as the position and speed of the target. Based on the scattering characteristics of the target, the radar can obtain information such as the size and shape of the target, and obtain the two-dimensional image and three-dimensional image of the target, so as to perform fine target identification. Radar is constantly developing in the direction of high frequency and broadband. New radar systems such as microwave photon radar can generate and process broadband signals of the order of 10GHz, and achieve high-resolution detection and imaging of the order of cm, so as to obtain more detailed scattering characteristic information of the target.

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

[0004] However, in the related technologies, the solution based on digital RF storage has difficulty in processing large-bandwidth signals, and is limited by storage depth and computing power, making it difficult to modulate the complex scattering characteristics of large-bandwidth signals; the solution based on mixers is only applicable to linear frequency-modulated signals; the solution based on optical delay lines has difficulty in simulating the complex scattering characteristics of the target and urgently needs to be improved. Summary of the invention

[0005] The present application provides a method and device for simulating multi-scattering point radar target echoes based on a wide-spectrum light source, so as to solve the problem that the related technology is difficult to process large-bandwidth signals, and is limited by storage depth and computing power, making it difficult to modulate complex scattering characteristics of large-bandwidth signals and simulating complex scattering characteristics of targets.

[0006] The first aspect of the present application provides a method for simulating multi-scattering point radar target echo based on a wide-spectrum light source, comprising the following steps: dividing a wide-spectrum light source passing through a polarizer into a wide-spectrum optical signal of an upper branch and a wide-spectrum optical signal of a lower branch; receiving a radar signal emitted by a radar to be tested, and modulating the radar signal on the wide-spectrum optical signal of the upper branch by suppressing carrier single-sideband modulation to obtain a modulated wide-spectrum optical signal of the upper branch; regulating the amplitude and phase of the wide-spectrum optical signal of the lower branch to change the impulse response of the radar target simulator to be tested, and obtaining a regulated wide-spectrum optical signal of the lower branch; combining the modulated wide-spectrum optical signal of the upper branch and the regulated wide-spectrum 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; converting the optical signal into a radio frequency signal by photoelectric conversion, and using the radio frequency signal as a radar simulation target echo signal to simulate the scattering characteristics of the radar target.

[0007] Optionally, in one embodiment of the present application, the amplitude and phase of the broadband optical signal of the lower branch are controlled, including: obtaining a corresponding one-dimensional radar range image according to the electromagnetic scattering characteristics of the radar to be tested at a preset rotation angle; obtaining a spectrum control function according to the corresponding one-dimensional radar range image, and controlling the amplitude and phase of the broadband optical signal of the lower branch according to the control function to obtain the broadband optical signal of the lower branch after control.

[0008] Optionally, in one embodiment of the present application, the calculation formula of the spectrum control function is:

[0009] H(Ω)=A(Ω)exp(jΦ(Ω)),

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

[0011] Optionally, in one embodiment of the present application, the radio frequency signal is used as a 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 using the two-dimensional imaging result to simulate the scattering characteristics of the radar target.

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

[0013]

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

[0015] The second aspect of the present application provides a multi-scattering point radar target echo simulation device based on a wide-spectrum light source, including: a division module, used to divide the wide-spectrum light source passed through a polarizer into a wide-spectrum light signal of an upper branch and a wide-spectrum light signal of a lower branch; an acquisition module, used to receive a radar signal emitted by a radar to be tested, and modulate the radar signal on the wide-spectrum light signal of the upper branch by suppressing carrier single-sideband to obtain a modulated wide-spectrum light signal of the upper branch; a control module, used to control the amplitude and phase of the wide-spectrum light signal of the lower branch to change the impulse response of the radar target simulator to be tested, and obtain a regulated wide-spectrum light signal of the lower branch; a combining module, used to combine the modulated wide-spectrum light signal of the upper branch and the regulated wide-spectrum light signal of the lower branch to obtain a combined light signal, and transmit the combined light signal through a dispersive medium to generate a final light signal; a simulation module, used to convert the light signal into a radio frequency signal by photoelectric conversion, and use the radio frequency signal as a radar simulation target echo signal to simulate the scattering characteristics of the radar target.

[0016] Optionally, in one embodiment of the present application, the control module includes: a first acquisition unit, used to obtain a corresponding radar one-dimensional range image according to the electromagnetic scattering characteristics of the radar to be tested at a preset rotation angle; a control unit, used to obtain a spectral control function according to the corresponding radar one-dimensional range image, and control the amplitude and the phase of the wide-spectrum optical signal of the lower branch according to the control function to obtain the wide-spectrum optical signal of the lower branch after control.

[0017] Optionally, in one embodiment of the present application, the calculation formula of the spectrum control function is:

[0018] H(Ω)=A(Ω)exp(jΦ(Ω)),

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

[0020] Optionally, in one embodiment of the present 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 the present application, the calculation formula of the broadband light source is:

[0022]

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

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

[0025] The fourth aspect embodiment of the present application provides a computer-readable storage medium, which stores a computer program. When the program is executed by a processor, it implements the above-mentioned multi-scattering point radar target echo simulation method based on a wide-spectrum light source.

[0026] The embodiment of the present application can divide the wide-spectrum light source into two paths, the received radar signal is modulated on the upper branch, and the lower branch reconstructs the amplitude and phase of the entire spectrum through the spectrum processor. The two signals are combined and transmitted through the dispersive medium, and converted into radio frequency signals by the photoelectric detector, and then the simulated radar target echo is output, thereby realizing the broadband echo simulation of multi-scattering point targets, breaking through the bottleneck that the existing scheme is difficult to realize the accurate simulation of multi-scattering point echoes in broadband conditions, and helping to speed up the development and calibration of microwave photon radars. Thus, the problem that the related technology is difficult to process large-bandwidth signals, and is limited by storage depth and computing power, it is difficult to realize the modulation of complex scattering characteristics of large-bandwidth signals, and it is difficult to simulate the complex scattering characteristics of targets is solved.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Figure 1 A flowchart of a method for simulating multi-scattering point radar target echo based on a wide-spectrum light source according to an embodiment of the present application;

[0030] Figure 2 A system schematic diagram of a method for simulating multi-scattering point radar target echoes based on a wide-spectrum light source according to an embodiment of the present application;

[0031] Figure 3 This is a schematic diagram of a one-dimensional range image result of a method for simulating a multi-scattering point radar target echo based on a wide-spectrum light source according to an embodiment of the present application;

[0032] Figure 4A schematic diagram of two-dimensional imaging results of a method for simulating multi-scattering point radar target echoes based on a wide-spectrum light source according to an embodiment of the present application;

[0033] Figure 5 It is a structural schematic diagram of a multi-scattering point radar target echo simulation device based on a wide-spectrum light source provided according to an embodiment of the present application;

[0034] Figure 6 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

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

[0036] The following describes the multi-scattering point radar target echo simulation method and device based on a wide-spectrum light source according to the embodiment of the present application with reference to the accompanying drawings. In view of the problem that the related technology mentioned in the above background technology is difficult to process large-bandwidth signals, and is limited by storage depth and computing power, it is difficult to realize the modulation of complex scattering characteristics of large-bandwidth signals, and it is difficult to simulate the complex scattering characteristics of targets, the present application provides a multi-scattering point radar target echo simulation method based on a wide-spectrum light source, in which the wide-spectrum light source can be divided into two paths, the received radar signal is modulated on the upper branch, and the lower branch reconstructs the amplitude and phase of the entire spectrum through a spectrum processor, and the two-path signal is combined and transmitted through a dispersive medium, and after being converted into a radio frequency signal by a photoelectric detector, a simulated radar target echo is output, thereby realizing broadband echo simulation of multi-scattering point targets, breaking through the bottleneck that the existing scheme is difficult to realize accurate simulation of multi-scattering point echoes in broadband conditions, and helping to accelerate the development and calibration of microwave photon radars. Thus, the problems that the related technology is difficult to process large-bandwidth signals, and is limited by storage depth and computing power, it is difficult to realize the modulation of complex scattering characteristics of large-bandwidth signals, and it is difficult to simulate the complex scattering characteristics of targets are solved.

[0037] Specifically, Figure 1 A schematic flow chart of a method for simulating multi-scattering point radar target echoes based on a wide-spectrum light source provided in an embodiment of the present application.

[0038] like Figure 1 As shown, the multi-scattering point radar target echo simulation method based on a wide-spectrum light source includes the following steps:

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

[0040] In the actual implementation process, Figure 2 As shown, the embodiment of the present application may include: a broadband light source, an electro-optic modulator, a dispersive medium, a spectrum processor, an adjustable optical delay line and a photodetector, wherein the bandwidth of the modulator is greater than the highest frequency of the signal to be processed. The broadband light source in the embodiment of the present application is first transmitted through a polarizer, and then divided into two paths, that is, it can be divided into a broadband light signal of an upper branch and a broadband light signal of a lower branch, to provide support for subsequent targeted processing of broadband light signals on different branches, thereby realizing broadband echo simulation of multi-scattering point targets.

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

[0042]

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

[0044] Specifically, in the embodiment of the present application, the broadband light source can be regarded as a collection of infinite single-wavelength light sources, and the expression is:

[0045]

[0046] According to the formula, the accuracy of calculation can be improved, so as to accurately obtain a wide-spectrum light source.

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

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

[0049] During the actual execution process, the embodiment of the present application can receive the radar signal emitted by the radar to be tested, and modulate the received radar signal on the wide-spectrum optical signal in the upper branch by suppressing the carrier single-sideband, so as to obtain the modulated wide-spectrum optical signal of the upper branch, thereby further providing 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 adjusted to change the impulse response of the radar target simulator to be tested, thereby obtaining the broadband optical signal of the lower branch after adjustment.

[0051] It can be understood that in the embodiment of the present application, the impulse response of the linear processing system of the radar signal is adjusted to simulate the scattering characteristics of the target.

[0052] As a possible implementation method, the embodiment of the present application can use a spectral processor to regulate the amplitude and phase of the wide-spectrum optical signal of the lower branch, and adjust the adjustable optical delay line to change the impulse response of the radar target simulator to be tested, and obtain the regulated wide-spectrum optical signal of the lower branch, thereby further providing support for realizing broadband echo simulation of multi-scattering point targets.

[0053] Furthermore, when the in-band dispersion is not considered, the impulse response is:

[0054]

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

[0056] It can be seen that the impulse response corresponds to the spectral control function.

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

[0058]

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

[0060] The embodiment of the present application changes the impulse response of the system and simulates the scattering characteristics of the target by reasonably adjusting the spectral response function of the spectral processor and the delay difference between the two signals.

[0061] Optionally, in one embodiment of the present application, the amplitude and phase of the broadband optical signal of the lower branch are regulated, including: obtaining a corresponding one-dimensional radar range image according to the electromagnetic scattering characteristics of the radar to be tested at a preset rotation angle; obtaining a spectrum control function according to the corresponding one-dimensional radar range image, and regulating the amplitude and phase of the broadband optical signal of the lower branch according to the control function to obtain the broadband optical signal of the lower branch after regulation.

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

[0063] In the actual implementation process, the embodiment of the present application can process 8-12GHz radar signals, and based on the electromagnetic scattering model or measured data, the electromagnetic scattering characteristics under a certain observation angle are simulated on a computer. The time domain expression of the electromagnetic scattering characteristics corresponds to the radar one-dimensional range image and also corresponds to the impulse response of the target simulation system. The corresponding radar one-dimensional range image is converted into a spectrum control function and sequentially input into the spectrum processor, and the simulated echo output by the system is pulse compressed. The radar one-dimensional range image is as follows: Figure 3 As shown, it can be seen that the present application generates the echo of the target with complex scattering characteristics. Further, the embodiment of the present application can adjust the amplitude and phase of the broadband optical signal of the lower branch according to the control function to obtain the broadband optical signal of the lower branch after adjustment, thereby simulating the echo of the target at different rotation angles.

[0064] The embodiment of the present application can perform pulse compression on the simulated echo output by the system, and the radar one-dimensional distance image is as follows: Figure 3 As shown, it can be seen that the present application generates echoes of 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 actual conditions and is not specifically limited here.

[0066] Optionally, in one embodiment of the present application, the calculation formula of the spectrum control function is:

[0067] H(Ω)=A(Ω)exp(jΦ(Ω)),

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

[0069] Specifically, the spectrum processor in the embodiment of the present application can introduce a spectrum control 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 regulated 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 a final optical signal.

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

[0074] In the actual implementation process, the embodiment of the present application can combine two signals, combine the modulated broadband optical signal of the upper branch and the regulated broadband optical signal of the lower branch to obtain a combined broadband optical signal, and transmit the combined broadband optical signal through a dispersive medium with a second-order dispersion coefficient of β2 to generate a final optical signal.

[0075] The present application is applicable to testing the detection capability of new radar systems such as microwave photon radar for targets with various scattering characteristics, and helps to accelerate the development and calibration of microwave photon radar.

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

[0077] In the actual implementation process, the embodiment of the present application can convert the optical signal into a radio frequency signal through photoelectric conversion by a photoelectric detector. The radio frequency signal is a simulated radar target echo signal. The radar simulated target echo signal can be used to simulate the scattering characteristics of the radar target.

[0078] The embodiments of the present application can utilize the advantages of large bandwidth and low transmission loss of optoelectronic devices to realize broadband echo simulation of targets with multiple scattering points. Based on the advantage of parallel processing of photon technology, a linear system with arbitrarily reconstructed impulse response is constructed in the optical domain to realize simulation of complex electromagnetic scattering characteristics of the target, thus breaking through the bottleneck that existing solutions are difficult to realize accurate simulation of multi-scattering point echoes in broadband conditions.

[0079] Optionally, in one embodiment of the present application, the radio frequency signal is used as a 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 using the two-dimensional imaging result to simulate the scattering characteristics of the radar target.

[0080] In the actual implementation process, the embodiment of the present application can obtain a simulated two-dimensional imaging result based on the radar simulated target echo signal, and use the simulated two-dimensional imaging result to simulate the scattering characteristics of the radar target. The embodiment of the present application converts the radar one-dimensional range image under multiple observation angles into a spectral processing function in sequence, inputs it into the spectral processor, receives and processes multiple radar pulses output by the system, and uses the ISAR imaging algorithm to obtain the imaging result of the simulated target, that is, the two-dimensional image Figure 4 As shown, it can be seen that the present application can accurately reconstruct the scattering characteristics of the target in a broadband situation.

[0081] The embodiment of the present application can continuously change the impulse response of the system, so that the system simulates radar echoes under multiple observation angles, and can test the imaging function of the radar to be tested, thereby simulating the complex scattering characteristics of the target.

[0082] According to the multi-scattering point radar target echo simulation method based on a wide-spectrum light source proposed in the embodiment of the present application, the wide-spectrum light source can be divided into two paths, the received radar signal is modulated on the upper branch, and the lower branch reconstructs the amplitude and phase of the entire spectrum through a spectrum processor. The two signals are combined and transmitted through a dispersive medium, and after being converted into a radio frequency signal by a photoelectric detector, a simulated radar target echo is output, thereby realizing broadband echo simulation of multi-scattering point targets, breaking through the bottleneck that the existing solution is difficult to achieve accurate simulation of multi-scattering point echoes in broadband conditions, and helping to speed up the development and calibration of microwave photon radars. Thus, the problem that the related technology is difficult to process large-bandwidth signals, and is limited by storage depth and computing power, it is difficult to modulate complex scattering characteristics of large-bandwidth signals, and it is difficult to simulate the complex scattering characteristics of targets is solved.

[0083] Next, a multi-scattering point radar target echo simulation device based on a wide-spectrum light source proposed in an embodiment of the present application is described with reference to the accompanying drawings.

[0084] Figure 5 It is a structural schematic diagram of a multi-scattering point radar target echo simulation device based on a wide-spectrum light source in an embodiment of the present application.

[0085] like Figure 5 As shown, the multi-scattering point radar target echo simulation device 10 based on a wide-spectrum 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 passing through the polarizer into a broadband light signal of an upper branch and a broadband light signal of a lower branch.

[0087] The acquisition module 200 is used to receive the radar signal emitted by the radar to be tested, and modulate the radar signal on 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.

[0088] The control module 300 is used to control the amplitude and phase of the broadband optical signal of the lower branch to change the impulse response of the radar target simulator to be tested and obtain the broadband optical signal of the lower branch after control.

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

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

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

[0092] Wherein, the first acquisition unit is used to obtain the corresponding radar one-dimensional range image according to the electromagnetic scattering characteristics of the radar to be tested at a preset rotation angle.

[0093] The control unit is used to obtain a spectrum control function according to the corresponding radar one-dimensional range image, and to control the amplitude and phase of the broadband optical signal of the lower branch according to the control function to obtain the broadband optical signal of the lower branch after control.

[0094] Optionally, in one embodiment of the present application, the calculation formula of the spectrum control function is:

[0095] H(Ω)=A(Ω)exp(jΦ(Ω)),

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

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

[0098] The second acquisition unit is used to obtain a two-dimensional imaging result based on the radar simulated target echo signal.

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

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

[0101]

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

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

[0104] According to the multi-scattering point radar target echo simulation device based on a wide-spectrum light source proposed in the embodiment of the present application, the wide-spectrum light source can be divided into two paths, the received radar signal is modulated on the upper branch, and the lower branch reconstructs the amplitude and phase of the entire spectrum through a spectrum processor. The two signals are combined and transmitted through a dispersive medium, and after being converted into a radio frequency signal by a photoelectric detector, a simulated radar target echo is output, thereby realizing broadband echo simulation of multi-scattering point targets, breaking through the bottleneck that the existing solution is difficult to achieve accurate simulation of multi-scattering point echoes in broadband conditions, and helping to speed up the development and calibration of microwave photon radars. Thus, the problem that the relevant technology is difficult to process large-bandwidth signals, and is limited by storage depth and computing power, it is difficult to modulate complex scattering characteristics of large-bandwidth signals, and it is difficult to simulate the complex scattering characteristics of targets is solved.

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

[0106] A memory 601 , a processor 602 , and a computer program stored in the memory 601 and executable on the processor 602 .

[0107] When the processor 602 executes the program, the multi-scattering point radar target echo simulation method based on a wide-spectrum light source provided in the above embodiment is implemented.

[0108] Furthermore, the electronic device further comprises:

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

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

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

[0112] If the memory 601, the processor 602 and the communication interface 603 are implemented independently, the communication interface 603, the memory 601 and the processor 602 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

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

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

[0115] This embodiment also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned multi-scattering point radar target echo simulation method based on a wide-spectrum light source is implemented.

[0116] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

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

[0118] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0119] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0120] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0121] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0122] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0123] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for simulating multi-scattering point radar target echo based on a wide-spectrum light source, characterized in that: The following steps are involved: The broadband light source passing through the polarizer is divided into a broadband light signal of an upper branch and a broadband light signal of a lower branch; Receiving a radar signal emitted by the radar to be tested, and modulating the radar signal on the broadband optical signal of the upper branch by suppressing carrier single sideband to obtain a modulated broadband optical signal of the upper branch; The broadband optical signal of the lower branch is regulated in amplitude and phase to change the impulse response of the radar target simulator to be tested, thereby obtaining the broadband optical signal of the lower branch after regulation; Combining the modulated broadband optical signal of the upper branch with the regulated 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; The optical signal is converted into a radio frequency signal through photoelectric conversion, and the radio frequency signal is used as a radar simulated target echo signal to simulate the scattering characteristics of the radar target.

2. The method according to claim 1, characterized in that The regulating the amplitude and phase of the broadband optical signal of the lower branch includes: According to the electromagnetic scattering characteristics of the radar to be tested at a preset rotation angle, a corresponding one-dimensional range image of the radar is obtained; A spectrum control function is obtained according to the corresponding one-dimensional radar range image, and the amplitude and the phase of the broadband optical signal of the lower branch are controlled according to the control function to obtain the broadband optical signal of the lower branch after control.

3. The method according to claim 2, characterized in that The calculation formula of the spectrum control function is: H(Ω)=A(Ω)exp(jΦ(Ω)), Wherein, A(Ω) and Φ(Ω) are the amplitude and phase of the optical signal with a wavelength of Ω, respectively.

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

5. The method according to claim 1, characterized in that The calculation formula of the broadband light source is: Among them, N(Ω k ) is the power spectrum of the wide-spectrum noise, Φ k The wavelength is Ω k The initial phase corresponding to the optical signal.

6. A multi-scattering point radar target echo simulation device based on a wide-spectrum light source, characterized in that: include: A division module, used for dividing the broadband light source passing through the polarizer into a broadband light signal of an upper branch and a broadband light signal of a lower branch; An acquisition module is used to receive a radar signal emitted by the radar to be tested, and modulate the radar signal on the broadband optical signal of the upper branch by suppressing carrier single sideband to obtain a modulated broadband optical signal of the upper branch; A control module, used for controlling the amplitude and phase of the broadband optical signal of the lower branch to change the impulse response of the radar target simulator to be tested, and obtaining the broadband optical signal of the lower branch after control; A combining module, used for combining the modulated broadband optical signal of the upper branch and the regulated 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; 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 a radar simulation target echo signal to simulate the scattering characteristics of the radar target.

7. The device according to claim 6, characterized in that The control module includes: An acquisition unit, configured to obtain a corresponding one-dimensional radar range image according to the electromagnetic scattering characteristics of the radar to be tested at a preset rotation angle; A control unit is used to obtain a spectrum control function according to the corresponding radar one-dimensional range image, and to control the amplitude and the phase of the broadband optical signal of the lower branch according to the control function to obtain the broadband optical signal of the lower branch after control.

8. The device according to claim 7, characterized in that The calculation formula of the spectrum control function is: H(Ω)=A(Ω)exp(jΦ(Ω)), Wherein, A(Ω) and Φ(Ω) are the amplitude and phase of the optical signal with a wavelength of Ω, respectively.

9. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the multi-scattering point radar target echo simulation method based on a wide-spectrum light source as described in any one of claims 1 to 5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the multi-scattering point radar target echo simulation method based on a wide-spectrum light source as described in any one of claims 1 to 5.

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