High-precision and fast registration method for topsar interferometric data
A high-precision, registration technology, applied in the direction of radio wave reflection/re-radiation, instruments, measuring devices, etc., can solve the problems of high image data registration accuracy and registration failure, and achieve high registration accuracy and algorithm high efficiency effect
Active Publication Date: 2020-07-31
SHANGHAI RADIO EQUIP RES INST
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Therefore, the TOPSAR working mode has extremely high requirements on the registration accuracy of image data. If the traditional data registration algorithm (such as cross-correlation method, etc.) is used, the registration will fail.
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[0048] The following combination Figure 2 ~ Figure 3 The technical content, structural features, objectives and effects of the present invention are described in detail through preferred embodiments.
[0049] Such as figure 2 As shown, the method for high-precision and fast registration of TOPSAR interferometric data provided by the present invention includes the following steps:
[0050] S1. Use the main antenna and auxiliary antenna of InSAR (Interferometric Synthetic Aperture Radar) to obtain coherent TOPSAR main image and auxiliary image of the same target respectively;
[0051] S2, using the trajectory information of the InSAR platform to correct the TOPSAR auxiliary image to obtain the TOPSAR auxiliary image after trajectory compensation;
[0052] S3. Separate the TOPSAR main image and the corrected TOPSAR auxiliary image into blocks along the distance to obtain the sub-main image and the sub-auxiliary image. The frequency domain cross-correlation method is used to estimate the...
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The invention relates to a high-precision rapid registering method of TOPSAR interference data. The high-precision rapid registering method comprises the following steps of utilizing platform track information of InSAR, and correcting the TOPSAR auxiliary image; respectively dividing the TOPSAR main image and the TOPSAR auxiliary image into a sub-main image and a sub-auxiliary image along the distance direction, adopting the frequency domain cross-correlation method to estimate the offset between the sub-main image and the sub-auxiliary image to register; generating ground height information according to the DEM information, and then obtaining the interference phase between a main antenna and an auxiliary antenna by combining the imaging geometrical relationship; compensating the TOPSAR main image by the interference phase, and adopting a frequency domain cross-correlation method to estimate the offset between the main image and the auxiliary image, and carrying out re-sampling on theTOPSAR auxiliary image; carrying out differential interference on the overlapped areas of the adjacent Burst in the TOPSAR main and auxiliary image, and adopting an enhanced spectrum diversity registration algorithm to estimate offset, and then moving the TOPSAR auxiliary image to complete final registration of the TOPSAR main image and auxiliary image. According to the method, the high-precisionregistration of long-baseline and terrain complex area images can be realized, the algorithm efficiency is high, and the method is suitable for real-time application.
Description
Technical field [0001] The invention relates to a data registration method, in particular to a high-precision and fast registration method for TOPSAR interference data, and belongs to the technical field of radar signal processing. Background technique [0002] Interferometric Synthetic Aperture Radar (InSAR, Interferometric Synthetic Aperture Radar) technology is a new ground remote sensing technology based on the rapid development of synthetic aperture radar (SAR) technology. The basic principle is to use two antennas of the SAR system (or one antenna for repeated observations) to obtain two coherent single-view complex images with a certain viewing angle difference in the same area, and to extract the ground surface based on their interference phase information. Elevation information and reconstructed Digital Elevation Model (DEM). [0003] At present, the existing InSAR system is developing in the direction of wide-range and high-precision, so a new TOPSAR (Terrain Observation...
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IPC IPC(8): G01S13/90G01S7/40
CPCG01S7/40G01S13/90G01S13/904
Inventor 李银伟夏慧婷卢护林王海涛
Owner SHANGHAI RADIO EQUIP RES INST