Method, device and storage medium for evaluating sidelobe ratio of SAR imaging quality
A technology of imaging quality and side lobes, applied in measurement devices, radio wave measurement systems, reflection/re-radiation of radio waves, etc., which can solve the problems of subjective evaluation methods, inaccurate analysis, and complex calculations.
Active Publication Date: 2020-06-05
中科南京移动通信与计算创新研究院
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[0004] The CS (chirpscaling) algorithm is a near-perfect frequency-domain processing method for SAR imaging. It uses a phase factor to change the spatial shift characteristics of range motion, which avoids interpolation operations for range motion correction, and not only avoids complex It also maintains the phase accuracy of the image very well and has a good imaging effect. The image performance evaluation after imaging is an important standard for testing the performance of SAR imaging algorithms. Usually, some general analysis functions of mathematical tools are used, and then Then judge the quality of the imaging according to the experience of the experimenters. This evaluation method is relatively subjective, and the analysis may not be accurate in the field of SAR imaging due to the use of general analysis functions.
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[0045] refer to figure 1 -4, an embodiment of the present invention provides a method for evaluating the sidelobe ratio of SAR imaging quality, comprising the following steps:
[0046] Perform fast Fourier transform FFT and inverse fast Fourier transform IFFT on point echo data to obtain SAR imaging images;
[0047] Acquiring the coordinate points to be evaluated, the coordinate points to be evaluated are positioned on the SAR imaging image;
[0048] Obtain the radius radii of the imaging area and the signal interpolation multiple insert of the coordinate point to be evaluated;
[0049] Perform insert multiple interpolation within the radius radii of the imaging area;
[0050] Select the peak position and the -3dB positions on the left and right sides of the peak within the radius radii of the imaging area after interpolation;
[0051] Get the minimum initialization value of the side lobe;
[0052] Determine the sidelobe values on the left and right sides of the peak acc...
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The invention discloses a method and a device for evaluating a side lobe ratio of an SAR imaging quality, and a storage medium. A coordinate point needing to be evaluated is selected after performingFourier transform on an SAR image. An imaging area is marked taking the coordinate point to be evaluated as the center of a circle. A side lobe determination mode is provided, and the peak side lobe ratio and the integral side lobe ratio are respectively calculated at where the peak drop in the imaging area is 3dB, so that an evaluation basis for an experimenter is provided.
Description
technical field [0001] The present invention relates to the technical field of synthetic aperture radar (SAR) imaging, and more particularly, relates to a sidelobe ratio evaluation method, device and storage medium of SAR imaging quality. Background technique [0002] The most widely used aspect of radar imaging technology is synthetic aperture radar (Synthetic Aperture Radar, referred to as SAR). At present, the application of airborne and spaceborne SAR has been very extensive, and sub-meter resolution can be obtained, and the quality of scene images is comparable to that of optical images for similar purposes. Utilizing the high-resolution capability of SAR, combined with other radar technologies, SAR can also complete the height measurement of the scene and display the ground moving target in the scene. [0003] The high resolution of SAR relies on broadband signals in the radial distance, and the frequency band of hundreds of megahertz can reduce the distance resolutio...
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IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41G01S13/90G01S13/9011
Inventor 母洪强闫夏超赵峰马英矫胡金龙石晶林
Owner 中科南京移动通信与计算创新研究院