SAR (Synthetic Aperture Radar) scene target generation method and device based on spatial calibration

Abstract

The invention discloses an SAR scene target generation method and device based on spatial calibration, and the method comprises the steps: carrying out the reconnaissance of an SAR signal through a sensor, and obtaining the flight direction of an SAR carrier; the method comprises the following steps: selecting an SAR target data set by setting a database; performing rotation and folding processing on the SAR target data set according to the flight direction of the SAR carrier to obtain a processed SAR target data set; performing uniform resolution processing on the processed SAR target data set and the SAR scene to obtain the SAR target data set and the SAR scene with uniform resolution; and through setting a fusion strategy, carrying out fusion processing on the SAR target data set and the SAR scene with the unified resolution to generate an SAR scene target. According to the method, the SAR scene target data set conforming to the actual imaging geometric features can be generated in a large scale in a relatively short time, and the data generation efficiency is improved.

Description

Technical Field

[0001] The present invention specifically relates to a method and device for generating SAR scene targets based on spatial calibration. It relates to the technical field of scene target generation and signal processing Background Art

[0002] Synthetic Aperture Radar (SAR) image datasets are particularly important for expanding the training set of neural networks. By increasing the size of SAR image datasets, we can significantly improve the training effect of neural networks, thereby enhancing the robustness of the network. This improvement in robustness helps the network maintain good performance when facing complex and changing environments. At the same time, rich datasets can also effectively reduce the underfitting phenomenon in the neural network training process, allowing the network to more accurately learn and simulate the characteristics of SAR images, thereby improving the prediction accuracy and reliability in practical applications. Therefore, increasing research on the collection and generation methods of SAR image datasets is of great significance to promoting the development of the remote sensing field.

[0003] However, current SAR image datasets face challenges such as high acquisition costs, complex processing procedures, and limited data volume, which undoubtedly limit their breadth and effectiveness in practical applications. In order to overcome this problem, researchers have proposed many methods to generate SAR data. However, traditional SAR target dataset generation methods, such as slicing the original SAR target dataset or using generative adversarial networks to generate datasets, are mainly limited to slice sets or ignore the spatial geometry of SAR images, resulting in the generated datasets not fitting the actual imaging.

[0004] Therefore, how to invent a SAR scene target generation method based on spatial calibration to improve the efficiency of data generation has become an urgent problem to be solved. Summary of the invention

[0005] To this end, the present invention provides a SAR scene target generation method and device based on spatial calibration, which can generate SAR scene target data sets that meet actual imaging geometric characteristics in large quantities in a relatively short time, thereby improving the efficiency of data generation.

[0006] In order to achieve the above object, the present invention provides the following technical solution: a SAR scene target generation method based on spatial calibration, comprising:

[0007] SAR signals are detected by sensors to obtain the flight direction of the SAR carrier;

[0008] By setting the database, select the SAR target data set;

[0009] Rotating and folding the SAR target data set according to the flight direction of the SAR carrier to obtain a processed SAR target data set;

[0010] Performing unified resolution processing on the processed SAR target data set and SAR scene to obtain the SAR target data set and the SAR scene with unified resolution;

[0011] By setting a fusion strategy, the SAR target data set and the SAR scene with uniform resolution are fused to generate a SAR scene target.

[0012] As a preferred solution of a SAR scene target generation method based on spatial calibration, in the process of rotating the SAR target data set, the rotation matrix expression is:

[0013]

[0014] Where θ is the set rotation angle.

[0015] As a preferred solution of a SAR scene target generation method based on spatial calibration, in the process of folding the SAR target data set, the expression of the folding process is:

[0016] C(i,j)=B(i,N+1-j)

[0017] Where C is the matrix after folding; B is the matrix before folding; i and j are matrix coordinates; N is the matrix size.

[0018] As a preferred solution of a SAR scene target generation method based on spatial calibration, in the process of subjecting the processed SAR target dataset and the SAR scene to unified resolution processing, the high-resolution SAR target dataset is converted into a low-resolution SAR target dataset through a downsampling strategy, so that the resolutions of the SAR target dataset and the SAR scene are unified.

[0019] As a preferred solution of a SAR scene target generation method based on spatial calibration, in the process of fusing the SAR target data set and the SAR scene with uniform resolution by setting the fusion strategy, the SAR target data set and the SAR scene with uniform resolution are respectively subjected to inverse imaging processing; after the inverse imaging processing, fusion is performed in the echo domain; the fusion processing expression is:

[0020]

[0021] Where γ is the adjustment factor; B' is the echo matrix corresponding to the SAR target after rotation; C' is the echo matrix corresponding to the SAR target after folding; D is the echo corresponding to the N×N size scene part in the SAR scene; L represents the left view; R represents the right view.

[0022] The present invention also provides a SAR scene target generation device based on spatial calibration, based on the above SAR scene target generation method based on spatial calibration, comprising:

[0023] The SAR carrier flight direction acquisition module is used to detect the SAR signal through the sensor and obtain the flight direction of the SAR carrier;

[0024] A SAR target data set selection module is used to select a SAR target data set by setting a database;

[0025] A SAR target data set processing module, used for rotating and folding the SAR target data set according to the flight direction of the SAR carrier to obtain a processed SAR target data set;

[0026] A resolution unification module, used for performing unified resolution processing on the processed SAR target data set and SAR scene to obtain the SAR target data set and the SAR scene with unified resolution;

[0027] The fusion processing module is used to fuse the SAR target data set and the SAR scene with uniform resolution by setting a fusion strategy to generate a SAR scene target.

[0028] As a preferred solution of a SAR scene target generation device based on spatial calibration, in the SAR target data set processing module, in the process of rotating the SAR target data set, the rotation matrix expression is:

[0029]

[0030] Where θ is the set rotation angle.

[0031] As a preferred solution of a SAR scene target generation device based on spatial calibration, in the SAR target data set processing module, in the process of folding the SAR target data set, the expression of the folding process is:

[0032] C(i,j)=B(i,N+1-j)

[0033] Where C is the matrix after folding; B is the matrix before folding; i and j are matrix coordinates; N is the matrix size.

[0034] As a preferred solution of a SAR scene target generation device based on spatial calibration, in the resolution unification module, in the process of performing unified resolution processing on the processed SAR target dataset and the SAR scene, the high-resolution SAR target dataset is converted into a low-resolution SAR target dataset through a downsampling strategy, so that the resolutions of the SAR target dataset and the SAR scene are unified.

[0035] As a preferred solution of a SAR scene target generation device based on spatial calibration, in the fusion processing module, in the process of fusing the SAR target data set and the SAR scene with uniform resolution by setting the fusion strategy, the SAR target data set and the SAR scene with uniform resolution are respectively subjected to inverse imaging processing; after the inverse imaging processing, fusion is performed in the echo domain; the fusion processing expression is:

[0036]

[0037] Where γ is the adjustment factor; B' is the echo matrix corresponding to the SAR target after rotation; C' is the echo matrix corresponding to the SAR target after folding; D is the echo corresponding to the N×N size scene part in the SAR scene; L represents the left view; R represents the right view.

[0038] The present invention has the following advantages: the SAR signal is detected by the sensor to obtain the flight direction of the SAR carrier; the SAR target data set is selected by setting the database; the SAR target data set is rotated and folded according to the flight direction of the SAR carrier to obtain the processed SAR target data set; the processed SAR target data set and the SAR scene are processed with uniform resolution to obtain the SAR target data set and the SAR scene with uniform resolution; the SAR target data set and the SAR scene with uniform resolution are fused by setting the fusion strategy to generate the SAR scene target. Based on the principle of spatial calibration, the present invention effectively transforms a variety of SAR target data sets through precise rotation and folding operations, and then fuses them with the SAR scene. This process can generate a large number of SAR image data sets that meet the actual imaging geometric features in a relatively short time, thereby solving the problem that the existing SAR image data sets ignore the SAR imaging geometric features. This breakthrough not only greatly improves the efficiency of data generation, but also ensures that the data set can adapt to a variety of application scenarios and meet the needs of different fields. More importantly, the present invention has excellent scalability and can be flexibly expanded to generate more types of SAR scene target data sets according to specific research or application requirements, thereby providing great convenience and broad possibilities for the continued development of remote sensing technology and future research. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0040] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0041] Figure 1 This is a schematic flow chart of a method for generating a SAR scene target based on spatial calibration provided in Embodiment 1 of the present invention;

[0042] Figure 2 This is a schematic diagram of a SAR scene result in a standard spatial coordinate system in a SAR scene target generation method based on spatial calibration provided in Example 1 of the present invention;

[0043] Figure 3 This is a schematic diagram of SAR scene imaging results in a SAR scene target generation method based on spatial calibration provided in Example 1 of the present invention;

[0044] Figure 4 This is a schematic diagram of a SAR target result in a standard spatial coordinate system in a SAR scene target generation method based on spatial calibration provided in Example 1 of the present invention;

[0045] Figure 5 This is a schematic diagram of the SAR target and scene fusion result in a standard spatial coordinate system in a SAR scene target generation method based on spatial calibration provided in Example 1 of the present invention;

[0046] Figure 6 This is a schematic diagram of a SAR target and a scene fusion result without transformation in a SAR scene target generation method based on spatial calibration provided in Example 1 of the present invention;

[0047] Figure 7 This is a schematic diagram of a SAR target and scene fusion result without transformation in a standard spatial coordinate system in a SAR scene target generation method based on spatial calibration provided in Example 1 of the present invention;

[0048] Figure 8 This is a schematic diagram of the SAR target and scene fusion result after transformation in a SAR scene target generation method based on spatial calibration provided in Example 1 of the present invention;

[0049] Fig. 9 A schematic diagram of a transformed SAR target and scene fusion result in a standard spatial coordinate system in a SAR scene target generation method based on spatial calibration provided in Example 1 of the present invention;

[0050] Fig.10 This is a schematic diagram of SAR scene results in a standard spatial coordinate system in a possible embodiment provided in Embodiment 1 of the present invention;

[0051] Fig.11 This is a schematic diagram of SAR scene imaging results in a possible embodiment provided in Embodiment 1 of the present invention;

[0052] Fig.12 This is a schematic diagram of SAR target results in a standard spatial coordinate system in a possible embodiment provided in Embodiment 1 of the present invention;

[0053] Fig.13 This is a schematic diagram of SAR target imaging results in a possible embodiment provided in Embodiment 1 of the present invention;

[0054] Fig.14 This is a schematic diagram of imaging results after SAR target and SAR scene fusion in a possible embodiment provided in Embodiment 1 of the present invention;

[0055] Fig.15 This is a schematic diagram of the fusion result of the SAR target and the SAR scene in a standard spatial coordinate system in a possible embodiment provided in Embodiment 1 of the present invention;

[0056] Fig.16 This is a schematic diagram of detection results after SAR target and SAR scene fusion in a possible embodiment provided in Embodiment 1 of the present invention;

[0057] Fig.17 This is a schematic diagram of the architecture of a SAR scene target generation device based on spatial calibration provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0058] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] Example 1

[0060] See also Figure 1 Embodiment 1 of the present invention provides a method for generating a SAR scene target based on spatial calibration, comprising the following steps:

[0061] S1. Detect SAR signals through sensors to obtain the flight direction of the SAR carrier;

[0062] S2. Selecting a SAR target data set by setting a database;

[0063] S3, rotating and folding the SAR target data set according to the flight direction of the SAR carrier to obtain a processed SAR target data set;

[0064] S4, performing unified resolution processing on the processed SAR target data set and SAR scene to obtain the SAR target data set and the SAR scene with unified resolution;

[0065] S5. By setting a fusion strategy, the SAR target data set and the SAR scene with uniform resolution are fused to generate a SAR scene target.

[0066] In this embodiment, in step S1, the SAR signal is detected by a sensor to obtain the flight direction of the SAR carrier;

[0067] Specifically, the SAR signal is reconnaissance-measured by the sensor to obtain the flight direction of the SAR carrier corresponding to the SAR scene.

[0068] In this embodiment, in step S2, a SAR target data set is selected by setting a database.

[0069] Specifically, the required SAR target data set is selected by setting the database.

[0070] In this embodiment, in step S3, the SAR target data set is rotated and folded according to the flight direction of the SAR carrier to obtain a processed SAR target data set;

[0071] Specifically, Figure 2As shown in the figure, the flight direction of the SAR carrier is from south to north, 45° north by east, and it is looking right. From the perspective of the SAR flight carrier, its flight direction is the azimuth after imaging, and the vertical direction is the distance direction. The corresponding imaging results are as follows: Figure 3 At this time, if you want to Figure 4 The SAR targets shown are fused into the SAR scene to form Figure 5 The results shown. Figure 4 If the fusion is performed directly without any transformation, the obtained range and azimuth imaging image is as follows: Figure 6 As shown, this Figure 6 The corresponding results in the standard space coordinate system are as follows Figure 7 As shown, this obviously does not meet the requirements. Therefore, it is necessary to Figure 4 Perform a rotation transformation and then fuse it into the range-azimuth imaging map, such as Figure 8 As shown in the figure, the result of the fused imaging result in the spatial coordinate system meets the requirements, such as Fig. 9 shown.

[0072] The rotation angle is related to the flight direction and the left and right side views. The present invention rotates counterclockwise. The flight angle is the angle between the flight direction and the due south and due north directions. Specifically:

[0073] If the flight direction is from south to north, and the angle of north-west is α, then the rotation angle β is:

[0074]

[0075] If the flight direction is from south to north, and the angle of north-east is α, then the rotation angle β is:

[0076]

[0077] If the flight direction is from north to south, and the angle of south-west is α, then the rotation angle β is:

[0078]

[0079] If the flight direction is from north to south, and the angle of south-east is α, then the rotation angle β is:

[0080]

[0081] In the above formula, R represents right-side viewing, and L represents left-side viewing. In order to achieve spatial calibration, if the SAR carrier is left-side viewing, it needs to be folded on the basis of rotation.

[0082] In this embodiment, the rotation angle operation is specifically as follows:

[0083] An element A(i,j) in the N×N matrix A is transformed into A after rotation. θ (i θ ,j θ ). It can be expressed as a matrix:

[0084]

[0085] Among them, the rotation matrix T can be expressed as:

[0086]

[0087] Where θ is the set rotation angle.

[0088] Finally, all pixels in matrix A are rotated to obtain matrix B.

[0089] In this embodiment, the folding operation is specifically as follows:

[0090] After rotation, each row of the N×N matrix B is folded to obtain the folded matrix C, where:

[0091] C(i,j)=B(i,N+1-j)

[0092] Where C is the matrix after folding; B is the matrix before folding; i and j are matrix coordinates; N is the matrix size.

[0093] In this embodiment, in step S4, the processed SAR target data set and SAR scene are processed with a uniform resolution to obtain the SAR target data set and the SAR scene with a uniform resolution;

[0094] Specifically, because the resolution of the SAR target dataset is different from that of the SAR scene, downsampling processing is required. The downsampling method reduces a pixel area in the SAR image to a pixel, whose value is the average of the pixel values ​​in this pixel area. The size of the pixel area is determined by the multiple relationship between the resolution of the SAR target dataset and the SAR scene. Downsampling converts the high-resolution SAR target dataset output by the spatial calibration module into a low-resolution SAR image target dataset, thereby unifying the resolution of the SAR target dataset and the SAR scene. Therefore, after processing, the resolution of the SAR target dataset and the SAR scene are the same. The subsequent steps only require selecting the target part and scene part of the same size in the SAR target dataset and the SAR scene for processing and fusion.

[0095] In this embodiment, in step S5, a fusion strategy is set to fuse the SAR target data set and the SAR scene with uniform resolution to generate a SAR scene target.

[0096] Specifically, firstly, the SAR scene and SAR target data with unified resolution are inversely imaged and fused in the echo domain. The fusion processing expression is:

[0097]

[0098] Where γ is the adjustment factor. The existence of the adjustment factor makes the fused image fit naturally in the scene; B' is the echo matrix corresponding to the SAR target after rotation; C' is the echo matrix corresponding to the SAR target after folding; D is the echo corresponding to the N×N size scene part in the SAR scene.

[0099] In a possible embodiment, a specific simulation experiment example is provided as follows:

[0100] like Fig.10 As shown in the figure, the corresponding SAR carrier flight direction is from south to north through reconnaissance, 63.5° north-east, and right-side viewing. Therefore, from the perspective of the SAR flight carrier, the range and azimuth diagram of its imaging is as follows: Fig.11 So, if we want to convert Fig.12 The SAR target shown in the figure is fused with the SAR scene. Fig.12 Calibrate to get Fig.13 The result is then unified in resolution, and finally the SAR target and SAR scene with unified resolution are fused to obtain the following image: Fig.14 The results shown in the spatial coordinate system are as follows Fig.15 As shown. And the SAR target generated by the method proposed in the present invention can be detected by target detection algorithms such as CFAR, which verifies the correctness of the proposed method. Fig.16 shown.

[0101] In summary, the present invention detects SAR signals through sensors to obtain the flight direction of the SAR carrier; selects a SAR target data set by setting a database; rotates and folds the SAR target data set according to the flight direction of the SAR carrier to obtain a processed SAR target data set; performs unified resolution processing on the processed SAR target data set and the SAR scene to obtain the SAR target data set and the SAR scene with unified resolution; and fuses the SAR target data set and the SAR scene with unified resolution by setting a fusion strategy to generate a SAR scene target. Based on the principle of spatial calibration, the present invention effectively transforms a variety of SAR target data sets through precise rotation and folding operations, and then fuses them with the SAR scene. This process can generate a large number of SAR image data sets that meet the actual imaging geometric features in a relatively short time, thereby solving the problem that the existing SAR image data sets ignore the SAR imaging geometric features. This breakthrough not only greatly improves the efficiency of data generation, but also ensures that the data set can adapt to a variety of application scenarios and meet the needs of different fields. More importantly, the present invention has excellent scalability and can be flexibly expanded to generate more types of SAR scene target data sets according to specific research or application requirements, thereby providing great convenience and broad possibilities for the continued development of remote sensing technology and future research.

[0102] It should be noted that the method of the embodiment of the present disclosure can be performed by a single device, such as a computer or a server. The method of the present embodiment can also be applied in a distributed scenario and completed by multiple devices cooperating with each other. In the case of such a distributed scenario, one of the multiple devices can only perform one or more steps in the method of the embodiment of the present disclosure, and the multiple devices will interact with each other to complete the described method.

[0103] It should be noted that the above describes some embodiments of the present disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0104] Example 2

[0105] See also Fig.17 Embodiment 2 of the present invention further provides a SAR scene target generation device based on spatial calibration, comprising:

[0106] The SAR carrier flight direction acquisition module 001 is used to detect the SAR signal through the sensor and obtain the flight direction of the SAR carrier;

[0107] SAR target data set selection module 002, used to select SAR target data set by setting database;

[0108] A SAR target data set processing module 003 is used to rotate and fold the SAR target data set according to the flight direction of the SAR carrier to obtain a processed SAR target data set;

[0109] A resolution unification module 004 is used to perform unified resolution processing on the processed SAR target data set and SAR scene to obtain the SAR target data set and the SAR scene with unified resolution;

[0110] The fusion processing module 005 is used to fuse the SAR target data set and the SAR scene with uniform resolution by setting a fusion strategy to generate a SAR scene target.

[0111] In this embodiment, in the SAR target data set processing module 003, in the process of rotating the SAR target data set, the rotation matrix expression is:

[0112]

[0113] Where θ is the set rotation angle.

[0114] In this embodiment, in the SAR target data set processing module 003, in the process of folding the SAR target data set, the expression of folding is:

[0115] C(i,j)=B(i,N+1-j)

[0116] Where C is the matrix after folding; B is the matrix before folding; i and j are matrix coordinates; N is the matrix size.

[0117] In this embodiment, in the resolution unification module 004, in the process of performing unified resolution processing on the processed SAR target dataset and the SAR scene, the high-resolution SAR target dataset is converted into the low-resolution SAR target dataset through a downsampling strategy, so that the resolutions of the SAR target dataset and the SAR scene are unified.

[0118] In this embodiment, in the fusion processing module 005, in the process of fusing the SAR target data set and the SAR scene with uniform resolution by setting the fusion strategy, the SAR target data set and the SAR scene with uniform resolution are respectively subjected to inverse imaging processing; after the inverse imaging processing, fusion is performed in the echo domain; the fusion processing expression is:

[0119]

[0120] Where γ is the adjustment factor; B' is the echo matrix corresponding to the SAR target after rotation; C' is the echo matrix corresponding to the SAR target after folding; D is the echo corresponding to the N×N size scene part in the SAR scene; L represents the left view; R represents the right view.

[0121] It should be noted that the information interaction, execution process and other contents between the modules of the above-mentioned system are based on the same concept as the method embodiment in Example 1 of the present application, and the technical effects they bring are the same as those of the method embodiment of the present application. For specific contents, please refer to the description in the method embodiment shown above in the present application, and will not be repeated here.

[0122] Example 3

[0123] Embodiment 3 of the present invention provides a non-transitory computer-readable storage medium, in which a program code for a SAR scene target generation method based on spatial calibration is stored. The program code includes instructions for executing the SAR scene target generation method based on spatial calibration of embodiment 1 or any possible implementation thereof.

[0124] The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more available media. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0125] Example 4

[0126] Embodiment 4 of the present invention provides an electronic device, including: a memory and a processor;

[0127] The processor and the memory communicate with each other via a bus; the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute a SAR scene target generation method based on spatial calibration of embodiment 1 or any possible implementation thereof.

[0128] Specifically, the processor can be implemented by hardware or by software. When implemented by hardware, the processor can be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor can be a general-purpose processor implemented by reading software codes stored in a memory. The memory can be integrated in the processor or can be located outside the processor and exist independently.

[0129] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable systems. The computer instructions can be stored in a computer-readable storage medium, or transmitted from a computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center.

[0130] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing system, they can be concentrated on a single computing system, or distributed on a network composed of multiple computing systems, and optionally, they can be implemented by a program code executable by a computing system, so that they can be stored in a storage system and executed by the computing system, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0131] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A method for generating SAR scene targets based on spatial calibration, characterized in that: include: SAR signals are detected by sensors to obtain the flight direction of the SAR carrier; By setting the database, select the SAR target data set; Rotating and folding the SAR target data set according to the flight direction of the SAR carrier to obtain a processed SAR target data set; Performing unified resolution processing on the processed SAR target data set and SAR scene to obtain the SAR target data set and the SAR scene with unified resolution; By setting a fusion strategy, the SAR target data set and the SAR scene with uniform resolution are fused to generate a SAR scene target.

2. The method for generating SAR scene targets based on spatial calibration according to claim 1, characterized in that: In the process of rotating the SAR target data set, the rotation matrix expression is: Where θ is the set rotation angle.

3. The method for generating SAR scene targets based on spatial calibration according to claim 2, characterized in that: In the process of folding the SAR target data set, the expression of folding is: C(i,j)=B(i,N+1-j) Where C is the matrix after folding; B is the matrix before folding; i and j are matrix coordinates; N is the matrix size.

4. The method for generating SAR scene targets based on spatial calibration according to claim 3, characterized in that: In the process of performing unified resolution processing on the processed SAR target dataset and the SAR scene, the high-resolution SAR target dataset is converted into the low-resolution SAR target dataset through a downsampling strategy, so that the resolutions of the SAR target dataset and the SAR scene are unified.

5. The method for generating SAR scene targets based on spatial calibration according to claim 4, characterized in that: In the process of fusing the SAR target data set and the SAR scene with uniform resolution by setting the fusion strategy, the SAR target data set and the SAR scene with uniform resolution are respectively subjected to inverse imaging processing; after the inverse imaging processing, fusion is performed in the echo domain; the fusion processing expression is: Where γ is the adjustment factor; B' is the echo matrix corresponding to the SAR target after rotation; C' is the echo matrix corresponding to the SAR target after folding; D is the echo corresponding to the N×N size scene part in the SAR scene; L represents the left view; R represents the right view.

6. A SAR scene target generation device based on spatial calibration, using a SAR scene target generation method based on spatial calibration according to any one of claims 1 to 5, characterized in that: include: The SAR carrier flight direction acquisition module is used to detect the SAR signal through the sensor and obtain the flight direction of the SAR carrier; A SAR target data set selection module is used to select a SAR target data set by setting a database; A SAR target data set processing module, used for rotating and folding the SAR target data set according to the flight direction of the SAR carrier to obtain a processed SAR target data set; A resolution unification module, used for performing unified resolution processing on the processed SAR target data set and SAR scene to obtain the SAR target data set and the SAR scene with unified resolution; The fusion processing module is used to fuse the SAR target data set and the SAR scene with uniform resolution by setting a fusion strategy to generate a SAR scene target.

7. The SAR scene target generation device based on spatial calibration according to claim 6, characterized in that: In the SAR target data set processing module, in the process of rotating the SAR target data set, the rotation matrix expression is: Where θ is the set rotation angle.

8. The SAR scene target generation device based on spatial calibration according to claim 7, characterized in that: In the SAR target data set processing module, in the process of folding the SAR target data set, the expression of folding is: C(i,j)=B(i,N+1-j) Where C is the matrix after folding; B is the matrix before folding; i and j are matrix coordinates; N is the matrix size.

9. The SAR scene target generation device based on spatial calibration according to claim 8, characterized in that: In the resolution unification module, in the process of performing unified resolution processing on the processed SAR target dataset and the SAR scene, the high-resolution SAR target dataset is converted into the low-resolution SAR target dataset through a downsampling strategy, so that the resolutions of the SAR target dataset and the SAR scene are unified.

10. The SAR scene target generation device based on spatial calibration according to claim 9, characterized in that: In the fusion processing module, in the process of fusing the SAR target data set and the SAR scene with uniform resolution by setting the fusion strategy, the SAR target data set and the SAR scene with uniform resolution are respectively subjected to inverse imaging processing; after the inverse imaging processing, fusion is performed in the echo domain; the fusion processing expression is: Where γ is the adjustment factor; B' is the echo matrix corresponding to the SAR target after rotation; C' is the echo matrix corresponding to the SAR target after folding; D is the echo corresponding to the N×N size scene part in the SAR scene; L represents the left view; R represents the right view.

Images