Multi-dimensional SAR data acquisition method, device and electronic equipment

Abstract

The present disclosure provides a multi-dimensional SAR data acquisition method, device, electronic device, storage medium and computer program product. The multi-dimensional SAR data acquisition method includes: generating a reference clock signal and a reference frequency signal, the reference clock signal and the reference frequency signal are used to provide a clock reference and a frequency reference for multiple band radars; configuring the working parameters of the multiple band radars according to the reference clock signal and the reference frequency signal, and sending the working parameters to the corresponding band radars; obtaining the first pulse repetition frequency signal fed back by each band radar, and determining the sampling delay correction parameter of each band radar according to the first pulse repetition frequency signal and the reference clock signal; correcting the working parameters of each band radar according to the sampling delay correction parameter of each band radar, so as to realize the synchronous acquisition of echo data by multiple band radars; and obtaining the echo data fed back by multiple band radars, and obtaining multi-dimensional SAR data accordingly.

Description

Technical Field

[0001] The present disclosure relates to the field of synthetic aperture radar technology, and in particular to a multi-dimensional SAR data acquisition method, device, electronic device, storage medium and computer program product. Background Art

[0002] Synthetic Aperture Radar (SAR) has the ability to observe the earth around the clock and in all weather conditions, and is of great significance in urban mapping, disaster monitoring and other fields. Traditional SAR imaging systems can only obtain the scattering characteristics of the target in a certain band if they want to obtain the observation data of the target. However, the target will show different scattering characteristics when imaged in different bands. If the scattering characteristics of the target in multiple bands can be obtained, the target scattering characteristic spectrum can be obtained, which will be beneficial to SAR image interpretation and target recognition.

[0003] With the development of SAR technology, the development of multi-dimensional SAR systems has become a research hotspot in the field of synthetic aperture radar at home and abroad. However, how to achieve the acquisition of multi-dimensional SAR data to provide data support for the acquisition of multi-dimensional scattering characteristics of targets is still a difficult problem that needs to be solved in this field. Summary of the invention

[0004] In view of this, the present disclosure provides a multi-dimensional SAR data acquisition method, device, electronic device, storage medium and computer program product, in order to at least partially solve the above technical problems.

[0005] According to one aspect of the present disclosure, a multi-dimensional SAR data acquisition method is provided, comprising:

[0006] Generate a reference clock signal and a reference frequency signal, wherein the reference clock signal and the reference frequency signal are used to provide a clock reference and a frequency reference for multiple-band radars;

[0007] Configure the operating parameters of multiple band radars according to the reference frequency signal and the reference clock signal, and send the operating parameters to the corresponding band radars;

[0008] Acquire a first pulse repetition frequency signal fed back by each band radar, and determine a first sampling delay correction parameter of each band radar according to the first pulse repetition frequency signal and a reference clock signal;

[0009] Correcting the working parameters of each band radar according to the first sampling delay correction parameter of each band radar, so as to enable multiple band radars to synchronously acquire echo data; and

[0010] Acquire echo data fed back by multiple-band radars and obtain multi-dimensional SAR data based on them.

[0011] According to an embodiment of the present disclosure, the first pulse repetition frequency signal includes a clock signal, and the sampling delay correction parameters of the radars of each band are determined according to the first pulse repetition frequency signal and the reference clock signal, including: for each band radar,

[0012] Determining a phase difference between the clock signal and the reference clock signal based on the clock signal and the reference clock signal;

[0013] The first sampling delay correction parameter of the radar in each band is determined according to the phase difference and the reference frequency signal.

[0014] According to an embodiment of the present disclosure, before acquiring echo data fed back by radars of multiple bands, the method further includes:

[0015] Acquire a second pulse repetition frequency signal fed back by each band radar, and determine a second sampling delay correction parameter of each band radar according to the second pulse repetition frequency signal and a reference clock signal;

[0016] Determine the magnitude of the second sampling delay correction parameter and a preset threshold;

[0017] When the second sampling delay correction parameter is not greater than a preset threshold, echo data of multiple band radars are obtained.

[0018] According to an embodiment of the present disclosure, determining a phase difference between the clock signal and the reference clock signal according to the clock signal and the reference clock signal includes:

[0019] The clock signal and the reference clock signal are subjected to fast Fourier transform processing to obtain a phase difference between the clock signal and the reference clock signal.

[0020] According to an embodiment of the present disclosure, the first sampling delay correction parameter of each band radar satisfies the following relationship:

[0021]

[0022] In the formula, Δt i represents the first sampling delay correction parameter of the i-th band radar, φ i represents the phase difference between the pulse repetition frequency signal fed back by the radar in the i-th band and the reference clock signal, F ref Indicates the frequency of the reference frequency signal.

[0023] According to an embodiment of the present disclosure, the operating bands of the multi-band radar include at least two of the P-band, L-band, S-band, C-band, X-band, Ku-band and Ka-band.

[0024] According to another aspect of the present disclosure, a multi-dimensional SAR data acquisition device is provided, comprising:

[0025] A generation module, used for generating a reference clock signal and a reference frequency signal, wherein the reference clock signal and the reference frequency signal are used for providing a clock reference and a frequency reference for multiple band radars;

[0026] A configuration module, used to configure the operating parameters of multiple band radars according to the reference frequency signal and the reference clock signal, and send the operating parameters to the corresponding band radars;

[0027] A first determination module is used to obtain a first pulse repetition frequency signal fed back by each band radar, and determine a first sampling delay correction parameter of each band radar according to the first pulse repetition frequency signal and a reference clock signal;

[0028] A first acquisition module, used to correct the working parameters of each band radar according to the first sampling delay correction parameter of each band radar, so as to achieve synchronous acquisition of echo data by multiple band radars; and

[0029] The second acquisition module is used to acquire echo data fed back by radars of multiple bands and obtain multi-dimensional SAR data based on them.

[0030] According to an embodiment of the present disclosure, the first pulse repetition frequency signal includes a clock signal, and the first determination module further includes:

[0031] A first determination submodule is used to determine the phase difference between the clock signal and the reference clock signal according to the clock signal and the reference clock signal for each band radar;

[0032] The second determination submodule is used to determine the first sampling delay correction parameter of each band radar according to the phase difference and the reference frequency signal.

[0033] According to an embodiment of the present disclosure, the device further includes:

[0034] A second determination module is used to receive a second pulse repetition frequency signal fed back by each band radar before acquiring the echo data fed back by the multiple band radars, and determine a second sampling delay correction parameter of each band radar according to the second pulse repetition frequency signal and a reference clock signal;

[0035] A determination module, used for determining the magnitude of the second sampling delay correction parameter and a preset threshold;

[0036] The third acquisition module is used to acquire the echo data of multiple band radars when the second sampling delay correction parameter is not greater than a preset threshold.

[0037] According to another aspect of the present disclosure, an electronic device is provided, comprising: one or more processors; and a memory for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors execute the multi-dimensional SAR data acquisition method as described above.

[0038] According to another aspect of the present disclosure, a computer-readable storage medium is further provided, on which executable instructions are stored. When the instructions are executed by a processor, the processor executes the multi-dimensional SAR data acquisition method as described above.

[0039] According to another aspect of the present disclosure, a computer program product is further provided, including a computer program, which implements the multi-dimensional SAR data acquisition method as described above when executed by a processor.

[0040] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above contents and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0042] Figure 1 is a flow chart of a multi-dimensional SAR data acquisition method according to an embodiment of the present disclosure;

[0043] Figure 2 is a flow chart of a method for determining first sampling delay correction parameters of radars of each band according to an embodiment of the present disclosure;

[0044] Figure 3A and Figure 3B is a schematic diagram of a process for achieving consistent sampling delay of echo data of multiple-band radars according to an embodiment of the present disclosure;

[0045] Figure 4 is a flow chart of a multi-dimensional SAR data acquisition method according to another embodiment of the present disclosure;

[0046] Figure 5 is a structural block diagram of a multi-dimensional SAR data acquisition device according to an embodiment of the present disclosure; and

[0047] Figure 6 It is a block diagram of an electronic device suitable for implementing a multi-dimensional SAR data acquisition method according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0048] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0049] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "include", "comprises", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components. In addition, if there are descriptions of "first", "second", etc. in the embodiments of the present disclosure, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0050] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0051] In the case of using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.). In the case of using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, or C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0052] Some block diagrams and / or flow charts are shown in the accompanying drawings. It should be understood that some boxes or combinations thereof in the block diagrams and / or flow charts can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that these instructions can create a device for implementing the functions / operations described in these block diagrams and / or flow charts when executed by the processor. The technology of the present disclosure can be implemented in the form of hardware and / or software (including firmware, microcode, etc.). In addition, the technology of the present disclosure can take the form of a computer program product on a computer-readable storage medium storing instructions, which can be used by an instruction execution system or used in conjunction with an instruction execution system.

[0053] Figure 1 is a flowchart of a multi-dimensional SAR data acquisition method according to an embodiment of the present disclosure.

[0054] like Figure 1 As shown, the multi-dimensional SAR data acquisition method 100 includes operations S110 to S150.

[0055] In operation S110 , a reference clock signal and a reference frequency signal are generated.

[0056] During the signal transmission and reception process, due to the differences in the internal time management modules of multiple-band radars, there are errors in the data receiving time windows of each band radar, making it difficult to achieve unified control of multiple-band radars and unable to synchronously obtain the echo data fed back by multiple-band radars.

[0057] In the embodiments of the present disclosure, the above technical problems can be overcome by providing a unified reference clock signal and a reference frequency signal for multiple band radars to provide a clock reference and a frequency reference for the multiple band radars.

[0058] Specifically, high-precision time alignment of multiple band radars can be achieved based on the reference clock signal, and the reference frequency signal can be used as the frequency reference to provide multiple band radars with a homogeneous, frequency-duration-phase adjustable pulse repetition frequency. The reference clock signal is subsequently used to estimate the delay error of each band, and then the error of each band is compensated according to the delay error, so that the sampling delay of the echo data of multiple band radars is consistent, and then the multi-band echo data with signal level coherence is synchronously obtained; and the different pulse repetition frequency signals configured for each band radar based on the reference frequency signal can be used to verify the consistency of the delay.

[0059] In the embodiment of the present disclosure, the operating bands of the multi-band radar may include, for example, but not limited to, at least two of the P-band, L-band, S-band, C-band, X-band, Ku-band, and Ka-band. In the embodiment of the present disclosure, the operating bands of the multi-band radar may be selected according to actual needs and are not limited here.

[0060] In addition, the reference clock signal and reference frequency signal provided to the multiple-band radars may be set according to actual conditions and are not specifically limited.

[0061] In operation S120, operating parameters of radars of multiple bands are configured according to the reference frequency signal and the reference clock signal, and the operating parameters are sent to radars of corresponding bands.

[0062] For each band radar, the radar's operating parameters can be configured according to the reference frequency signal and the reference clock signal, and the operating parameters are sent to the corresponding band radar. After receiving the operating parameters, each band radar will send and receive signals.

[0063] The radar operating parameters may include, but are not limited to, radar operating mode, frequency modulation time width, frequency modulation bandwidth, pulse repetition frequency (PRF), AD operating mode, number of sampling points, sampling delay, polarization mode, transceiver switch pulse width, etc., without specific limitation. In the disclosed embodiment, the operating parameters of radars of different bands may be different.

[0064] In this embodiment, a unified clock reference and frequency reference are provided for multiple band radars, thereby ensuring the time consistency of the radars of each band, thereby achieving the purpose of synchronously acquiring data by the multi-band radars.

[0065] In operation S130, a first pulse repetition frequency signal fed back by each band radar is acquired, and a first sampling delay correction parameter of each band radar is determined according to the first pulse repetition frequency signal and a reference clock signal.

[0066] For example, the first sampling delay correction parameter of each band radar can be determined based on the first pulse repetition frequency signal and the reference clock signal fed back by each band radar. The first sampling delay correction parameter will be used to correct the working parameters of each band radar so that the echo data sampling delay of each band radar is consistent, thereby synchronously acquiring multi-band echo data with signal level coherence.

[0067] In operation S140, the operating parameters of the radars of each band are corrected according to the first sampling delay correction parameters of the radars of each band, so that the radars of multiple bands can synchronously acquire echo data.

[0068] In this embodiment, the first sampling delay correction parameter of each band radar is used to correct the working parameters of each band radar. For example, it can refer to using the first sampling delay correction parameter to correct the sampling delay amount, thereby making the echo data sampling delay of each band radar consistent, thereby enabling multiple band radars to synchronously acquire echo data.

[0069] In operation S150, echo data fed back by radars of multiple bands are acquired, and multi-dimensional SAR data is obtained accordingly.

[0070] After the working parameters of the radars of each band are corrected, the sampling delay of the echo data of the radars of each band is consistent. At this time, the echo data fed back by multiple band radars can be obtained synchronously, and multi-dimensional SAR data can be obtained based on the echo data fed back by multiple band radars.

[0071] The technical solution of the disclosed embodiment provides a unified clock reference and frequency reference for multiple-band radars, and compensates for the delay errors of the signals fed back by the radars of each band accordingly, thereby making the sampling delays of the echo data of the multiple-band radars consistent. It is possible to synchronously acquire multi-band echo data with signal-level coherence in a simple and efficient manner, thereby obtaining multi-dimensional SAR data.

[0072] Figure 2 is a flowchart of a method for determining the first sampling delay correction parameter of each band radar according to an embodiment of the present disclosure, and will be referred to below Figure 2 An example implementation of the above operation S130 is described below.

[0073] like Figure 2 As shown, the method for determining the first sampling delay correction parameter of each band radar includes operations S231-S232.

[0074] In operation S231 , for each band radar, a phase difference between the clock signal and the reference clock signal is determined according to the clock signal and the reference clock signal.

[0075] For each band radar, after obtaining the first pulse repetition frequency signal fed back by each band radar, the clock signal in the first pulse repetition frequency signal can be extracted, and the clock signal and the reference clock signal are processed by Fast Fourier Transform (FFT) to obtain the phase difference between the clock signal and the reference clock signal.

[0076] In operation S232, a first sampling delay correction parameter of each band radar is determined according to the phase difference and the reference frequency signal.

[0077] After the phase difference between the clock signal of each band and the reference clock signal is obtained, the first sampling delay correction parameter of the radar of each band can be determined based on the phase difference and the reference frequency signal.

[0078] Among them, the first sampling delay correction parameters of radars in each band satisfy the following relationship:

[0079]

[0080] In the formula, Δt i represents the first sampling delay correction parameter of the i-th band radar, φ i represents the phase difference between the pulse repetition frequency signal fed back by the radar in the i-th band and the reference clock signal, F ref Indicates the frequency of the reference frequency signal.

[0081] Based on the above method, the first sampling delay correction parameter of each band radar can be accurately calculated, so that the delay error of each band radar can be compensated according to the first sampling delay correction parameter, thereby realizing the synchronous acquisition of echo data fed back by multiple band radars, and obtaining multi-dimensional SAR data based on the echo data fed back by multiple band radars.

[0082] Figure 3A and Figure 3B FIG. 1 is a schematic diagram of a process for achieving consistent sampling delay of echo data of multiple band radars according to an embodiment of the present disclosure. Figure 3A and Figure 3B The principle of achieving consistent sampling delay of echo data of multi-band radars is briefly explained.

[0083] like Figure 3A As shown in the figure, for multiple band radars, such as band 1 radar to band n radar, before the delay error correction, due to the difference in the internal time management module of each band radar, the data receiving time window of each band radar has an error. For example, the receiving time windows of the data feedback from band 1 radar to band n radar are not synchronized with each other, so it is impossible to obtain and process the feedback data of multiple band radars in the same dimension, so it is necessary to correct the consistency of the sampling delay of the echo data of multiple band radars.

[0084] Figure 3B The schematic diagram shows the echo data fed back by the radars of each band after compensating or correcting the delay errors of the radars of each band. Figure 3B As shown, by compensating the delay errors of radars in each band, the data receiving time windows of radars in each band are aligned, that is, the sampling delay consistency of radars in each band is achieved, so that the echo data of radars in multiple bands can be obtained synchronously.

[0085] Figure 4is a flowchart of a multi-dimensional SAR data acquisition method according to another embodiment of the present disclosure.

[0086] like Figure 4 As shown, the multi-dimensional SAR data acquisition method 400 includes operations S410 to S470. Operations S410 to S440 and operation S470 can be implemented in the same manner as operations S110 to S150, respectively, and the repeated parts will not be described in detail.

[0087] In operation S410, a reference clock signal and a reference frequency signal are generated.

[0088] In operation S420, operating parameters of radars of multiple bands are configured according to the reference clock signal and the reference frequency signal, and the operating parameters are sent to radars of corresponding bands.

[0089] In operation S430, a first pulse repetition frequency signal fed back by each band radar is acquired, and a first sampling delay correction parameter of each band radar is determined according to the first pulse repetition frequency signal and a reference clock signal.

[0090] In operation S440, the operating parameters of the radars of each band are corrected according to the first sampling delay correction parameters of the radars of each band, so that the radars of multiple bands can synchronously acquire echo data.

[0091] In operation S450, a second pulse repetition frequency signal fed back by each band radar is acquired, and a second sampling delay correction parameter of each band radar is determined according to the second pulse repetition frequency signal and a reference clock signal.

[0092] After correcting the working parameters of the radars of each band, the effect of the correction can be verified to determine whether the correction effect meets expectations. If the corrected result meets expectations, it means that the error of the receiving time window of the echo data of multiple band radars is within the allowable range, which means that the echo data of the radars of each band has achieved sampling delay consistency. At this time, the echo data of multiple band radars can be obtained, and multi-dimensional SAR data can be obtained based on it; if the corrected result does not meet expectations, it means that the working parameters of the radars of each band need to be corrected according to the above method until the delay error value meets the expected result.

[0093] For example, the second pulse repetition frequency signal fed back by each band radar can be obtained, and the second sampling delay correction parameter of each band radar can be determined based on the second pulse repetition frequency signal and the reference clock signal. The second sampling delay correction parameter will be used later to verify the correction effect.

[0094] In operation S460, the magnitude of the second sampling delay correction parameter and the preset threshold is determined. If the second sampling delay correction parameter is not greater than the preset threshold, operation S470 is performed; otherwise, operations S430 to S460 are performed.

[0095] For example, the effect of the correction can be determined by judging the difference between the second sampling delay correction parameter and the preset threshold. When the second sampling delay correction parameter is not greater than the preset threshold, it means that the echo data of the radars of each band have achieved sampling delay consistency. At this time, the echo data of multiple bands of radars can be obtained, and multi-dimensional SAR data can be obtained accordingly; otherwise, the working parameters of the radars of each band are continuously corrected until the above requirements are met.

[0096] In operation S470, echo data fed back by radars of multiple bands are acquired, and multi-dimensional SAR data is obtained accordingly.

[0097] In the disclosed embodiment, the correction effect is verified based on the second pulse repetition frequency signal fed back by the radars of each band, thereby reducing the error of the acquired data and improving the accuracy of the multi-dimensional SAR data.

[0098] Based on the above multi-dimensional SAR data acquisition method, the present disclosure also provides a multi-dimensional SAR data acquisition device. Figure 5 The multi-dimensional SAR data acquisition device is described in detail.

[0099] Figure 5 It is a structural block diagram of a multi-dimensional SAR data acquisition device according to an embodiment of the present disclosure.

[0100] like Figure 5 As shown, the multi-dimensional SAR data acquisition device 500 includes a generation module 510 , a configuration module 520 , a first determination module 530 , a first acquisition module 540 and a second acquisition module 550 .

[0101] The generating module 510 is used to generate a reference clock signal and a reference frequency signal, and the reference clock signal and the reference frequency signal are used to provide a clock reference and a frequency reference for multi-band radars.

[0102] The configuration module 520 is used to configure the operating parameters of multiple band radars according to the reference clock signal and the reference frequency signal, and send the operating parameters to the corresponding band radars.

[0103] The first determination module 530 is used to obtain a first pulse repetition frequency signal fed back by each band radar, and determine a first sampling delay correction parameter of each band radar according to the first pulse repetition frequency signal and a reference clock signal.

[0104] The first acquisition module 540 is used to correct the working parameters of each band radar according to the first sampling delay correction parameter of each band radar, so as to achieve synchronous acquisition of echo data by multiple band radars.

[0105] as well as

[0106] The second acquisition module 550 is used to acquire echo data fed back by radars of multiple bands, and obtain multi-dimensional SAR data accordingly.

[0107] In some embodiments of the present disclosure, the first pulse repetition frequency signal includes a clock signal, and the first determination module 530 further includes a first determination submodule and a second determination submodule.

[0108] The first determination submodule is used to determine the phase difference between the clock signal and the reference clock signal according to the clock signal and the reference clock signal for each band of radar.

[0109] The second determination submodule is used to determine the first sampling delay correction parameter of each band radar according to the phase difference and the reference frequency signal.

[0110] In some embodiments of the present disclosure, the multi-dimensional SAR data acquisition device 500 further includes a second determination module, a judgment module and a third acquisition module.

[0111] The second determination module is used to receive the second pulse repetition frequency signal fed back by each band radar before acquiring the echo data fed back by multiple band radars, and determine the second sampling delay correction parameter of each band radar according to the second pulse repetition frequency signal and the reference clock signal.

[0112] The judging module is used to judge the magnitude of the second sampling delay correction parameter and a preset threshold.

[0113] The third acquisition module is used to acquire the echo data of multiple band radars when the second sampling delay correction parameter is not greater than a preset threshold.

[0114] The technical solution of the disclosed embodiment provides a unified clock reference and frequency reference for multiple-band radars, and compensates for the delay errors of the signals fed back by the radars of each band accordingly, thereby making the sampling delays of the echo data of the multiple-band radars consistent. It is possible to synchronously acquire multi-band echo data with signal-level coherence in a simple and efficient manner, thereby obtaining multi-dimensional SAR data.

[0115] It should be noted that the implementation methods, technical problems solved, functions realized, and technical effects achieved of each module / unit / sub-unit in the device part embodiment are the same or similar to the implementation methods, technical problems solved, functions realized, and technical effects achieved of each corresponding step in the method part embodiment, and will not be repeated here.

[0116] According to an embodiment of the present disclosure, any multiple modules of the generation module 510, the configuration module 520, the first determination module 530, the first acquisition module 540, and the second acquisition module 550 can be combined in one module for implementation, or any one of the modules can be split into multiple modules. Alternatively, at least part of the functions of one or more of these modules can be combined with at least part of the functions of other modules and implemented in one module. According to an embodiment of the present disclosure, at least one of the generation module 510, the configuration module 520, the first determination module 530, the first acquisition module 540, and the second acquisition module 550 can be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), a system on a chip, a system on a substrate, a system on a package, an application specific integrated circuit (ASIC), or can be implemented by hardware or firmware such as any other reasonable way of integrating or packaging the circuit, or implemented in any one of the three implementation methods of software, hardware, and firmware or in a suitable combination of any of them. Alternatively, at least one of the generating module 510 , the configuring module 520 , the first determining module 530 , the first acquiring module 540 , and the second acquiring module 550 may be at least partially implemented as a computer program module, which may perform a corresponding function when executed.

[0117] In the technical solution disclosed herein, the acquisition, collection, storage, use, processing, transmission, provision, disclosure and application of data all comply with the provisions of relevant laws and regulations, take necessary confidentiality measures, and do not violate public order and good morals.

[0118] Figure 6 A block diagram of an electronic device suitable for implementing a multi-dimensional SAR data acquisition method according to an embodiment of the present disclosure is schematically shown.

[0119] like Figure 6 As shown, the electronic device 600 according to an embodiment of the present disclosure includes a processor 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage part 608 into a random access memory (RAM) 603. The processor 601 may include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor and / or a related chipset and / or a special-purpose microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 601 may also include an onboard memory for caching purposes. The processor 601 may include a single processing unit or multiple processing units for performing different actions of the method flow according to an embodiment of the present disclosure.

[0120] In RAM 603, various programs and data required for the operation of electronic device 600 are stored. Processor 601, ROM 602 and RAM 603 are connected to each other via bus 604. Processor 601 performs various operations of the method flow according to the embodiment of the present disclosure by executing the program in ROM 602 and / or RAM 603. It should be noted that the program can also be stored in one or more memories other than ROM 602 and RAM 603. Processor 601 can also perform various operations of the method flow according to the embodiment of the present disclosure by executing the program stored in the one or more memories.

[0121] According to an embodiment of the present disclosure, the electronic device 600 may further include an input / output (I / O) interface 605, which is also connected to the bus 604. The electronic device 600 may further include one or more of the following components connected to the I / O interface 605: an input portion 606 including a keyboard, a mouse, etc.; an output portion 607 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage portion 608 including a hard disk, etc.; and a communication portion 609 including a network interface card such as a LAN card, a modem, etc. The communication portion 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as needed. A removable medium 611, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 610 as needed, so that a computer program read therefrom is installed into the storage portion 608 as needed.

[0122] The present disclosure also provides a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments; or may exist independently without being assembled into the device / apparatus / system. The above computer-readable storage medium carries one or more programs, and when the above one or more programs are executed, the method according to the embodiment of the present disclosure is implemented.

[0123] According to an embodiment of the present disclosure, the computer-readable storage medium may be a non-volatile computer-readable storage medium, for example, may include but is not limited to: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, an apparatus or a device. For example, according to an embodiment of the present disclosure, a computer-readable storage medium may include the ROM 602 and / or RAM 603 described above and / or one or more memories other than ROM 602 and RAM 603.

[0124] The embodiment of the present disclosure also includes a computer program product, which includes a computer program, and the computer program contains program code for executing the method shown in the flowchart. When the computer program product is run in a computer system, the program code is used to enable the computer system to implement the multi-dimensional SAR data acquisition method provided by the embodiment of the present disclosure.

[0125] The above functions defined in the system / device of the embodiment of the present disclosure are performed when the computer program is executed by the processor 601. According to the embodiment of the present disclosure, the system, device, module, unit, etc. described above can be implemented by a computer program module.

[0126] In one embodiment, the computer program may rely on tangible storage media such as optical storage devices, magnetic storage devices, etc. In another embodiment, the computer program may also be transmitted and distributed in the form of signals on a network medium, and downloaded and installed through the communication part 609, and / or installed from a removable medium 611. The program code contained in the computer program may be transmitted using any appropriate network medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0127] In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 609, and / or installed from the removable medium 611. When the computer program is executed by the processor 601, the above functions defined in the system of the embodiment of the present disclosure are performed. According to the embodiment of the present disclosure, the system, device, apparatus, module, unit, etc. described above can be implemented by a computer program module.

[0128] According to an embodiment of the present disclosure, the program code for executing the computer program provided by the embodiment of the present disclosure can be written in any combination of one or more programming languages. Specifically, these computing programs can be implemented using high-level process and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, Java, C++, python, "C" language or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, partially on the remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device can be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computing device (for example, using an Internet service provider to connect through the Internet).

[0129] The flow charts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flow chart or block diagram can represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flow chart, and the combination of the boxes in the block diagram or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0130] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways, even if such combinations and / or combinations are not explicitly described in the present disclosure. In particular, the features described in the various embodiments and / or claims of the present disclosure may be combined and / or combined in a variety of ways without departing from the spirit and teachings of the present disclosure. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0131] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present disclosure is defined by the attached claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A multi-dimensional SAR data acquisition method, characterized in that: include: Generate a reference clock signal and a reference frequency signal, wherein the reference clock signal and the reference frequency signal are used to provide a clock reference and a frequency reference for multiple band radars; configuring the operating parameters of the multiple band radars according to the reference frequency signal and the reference clock signal, and sending the operating parameters to the corresponding band radars; Acquire a first pulse repetition frequency signal fed back by each band radar, and determine a first sampling delay correction parameter of each band radar according to the first pulse repetition frequency signal and the reference clock signal; wherein the first pulse repetition frequency signal includes a clock signal, and the determining the first sampling delay correction parameter of each band radar according to the first pulse repetition frequency signal and the reference clock signal includes: for each band radar, determining a phase difference between the clock signal and the reference clock signal according to the clock signal and the reference clock signal; and determining the first sampling delay correction parameter of the radar of each band according to the phase difference and the reference frequency signal; Correcting the working parameters of the radars of each band according to the first sampling delay correction parameters of the radars of each band, so as to enable the radars of multiple bands to synchronously acquire echo data; Acquire a second pulse repetition frequency signal fed back by each band radar, and determine a second sampling delay correction parameter of each band radar according to the second pulse repetition frequency signal and the reference clock signal; Determine the magnitude of the second sampling delay correction parameter and a preset threshold; When the second sampling delay correction parameter is not greater than the preset threshold, Acquire echo data fed back by multiple-band radars and obtain multi-dimensional SAR data based on them.

2. The multi-dimensional SAR data acquisition method according to claim 1, characterized in that: The step of determining a phase difference between the clock signal and the reference clock signal according to the clock signal and the reference clock signal comprises: The clock signal and the reference clock signal are subjected to fast Fourier transform processing to obtain a phase difference between the clock signal and the reference clock signal.

3. The multi-dimensional SAR data acquisition method according to claim 1 or 2, characterized in that: The first sampling delay correction parameters of the radars of each band satisfy the following relationship: In the formula, represents the first sampling delay correction parameter of the i-th band radar, represents the phase difference between the pulse repetition frequency signal fed back by the i-th band radar and the reference clock signal, F ref represents the frequency of the reference frequency signal.

4. The multi-dimensional SAR data acquisition method according to claim 3, characterized in that: The operating bands of the multi-band radar include at least two of P-band, L-band, S-band, C-band, X-band, Ku-band and Ka-band.

5. A multi-dimensional SAR data acquisition device, characterized in that: include: A generating module, used for generating a reference clock signal and a reference frequency signal, wherein the reference clock signal and the reference frequency signal are used for providing a clock reference and a frequency reference for multiple-band radars; A configuration module, configured to configure the operating parameters of the multiple band radars according to the reference frequency signal and the reference clock signal, and send the operating parameters to the corresponding band radars; a first determination module, configured to obtain a first pulse repetition frequency signal fed back by each band radar, and determine a first sampling delay correction parameter of each band radar according to the first pulse repetition frequency signal and the reference clock signal; wherein the first pulse repetition frequency signal includes a clock signal, and the first determination module further includes: a first determination submodule, configured to determine, for each band radar, a phase difference between the clock signal and the reference clock signal according to the clock signal and the reference clock signal; and a second determination submodule, configured to determine the first sampling delay correction parameter of each band radar according to the phase difference and the reference frequency signal; A first acquisition module, configured to correct the working parameters of each band radar according to the first sampling delay correction parameter of each band radar, so as to enable multiple band radars to synchronously acquire echo data; and The second acquisition module is used to acquire echo data fed back by radars of multiple bands and obtain multi-dimensional SAR data accordingly; A second determination module is used to receive a second pulse repetition frequency signal fed back by each band radar before acquiring the echo data fed back by the multiple band radars, and determine a second sampling delay correction parameter of each band radar according to the second pulse repetition frequency signal and the reference clock signal; A judging module, used for judging the difference between the second sampling delay correction parameter and a preset threshold value; The third acquisition module is used to acquire the echo data of multiple band radars when the second sampling delay correction parameter is not greater than the preset threshold.

6. An electronic device, characterized in that: include: one or more processors; a memory for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors execute the multi-dimensional SAR data acquisition method according to any one of claims 1 to 4.

Images