Inverse synthetic aperture radar (ISAR) image registration method based on wave path-difference compensation
A technology of image registration and wave path difference, which is applied in the direction of radio wave reflection/re-radiation, radio wave measurement system, and utilization of re-radiation, etc. It can solve the problem of low precision of ISAR image registration method and high requirements of radar hardware system, etc. problem, to achieve the effect of eliminating wave path difference, high registration accuracy, and reducing the amount of calculation
Active Publication Date: 2018-12-18
NAT UNIV OF DEFENSE TECH
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[0004] The technical problem to be solved by the present invention is to provide an ISAR image registration method based on path difference compensation for the shortcomings of the InISAR imaging system, such as the low accuracy of the ISAR image registration method and the high requirements for the radar hardware system.
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[0025] In order to describe the present invention more clearly, the present invention will be described in detail below by taking the InISAR imaging system composed of three radars as an example.
[0026] figure 1 is the radar observation model of the embodiment of the present invention. Such as figure 1 As shown, the figure contains two parallel coordinate systems: the radar coordinate system (A-XYZ) and the target coordinate system (O-xyz); in the radar coordinate system, the Y-axis direction is the electrical axis direction; the three radars are in The positions in the radar coordinate system are A(0,0,0), B(L,0,0) and C(0,0,L). When the InISAR imaging system is used to image the target, only antenna A emits electromagnetic waves, and all three antennas receive electromagnetic waves. The position of the target center in the radar coordinate system is O(X 0 ,Y 0 ,Z 0 ); the origin of the target coordinate system is located at the geometric center of the target, that ...
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The invention provides an inverse synthetic aperture radar (ISAR) image registration method based on wave path difference compensation. According to the technical scheme, it is assumed that a first target echo, a second target echo and a third target echo are obtained by using an interferometric inverse synthetic aperture radar (InISAR) imaging system, the three target echoes come from different radars in the InISAR imaging system, an antenna corresponding to the first target echo is a transmitting antenna, and the ISAR image registration method comprises the following steps that step 1, the angular velocity of rotation of a target is estimated; step 2, according to the geometrical relation, the wave path difference between an arbitrary scattering point of the target and different antennasis calculated; step 3, a phase difference compensation phase is constructed, and phase compensation is carried out; and step 4, an ISAR image after registration is calculated. The ISAR image registration method based on the wave path difference compensation has small calculation amount and high registration accuracy.
Description
technical field [0001] The invention relates to the field of InISAR (Interferometric Inverse Synthetic Aperture Radar, Interferometric Inverse Synthetic Aperture Radar) three-dimensional imaging, in particular to an ISAR (Inverse Synthetic Aperture Radar, Inverse Synthetic Aperture Radar) image registration method. Background technique [0002] InISAR 3D imaging technology is a combination of high-resolution ISAR imaging technology and interferometric technology. The interferometric phase is obtained by interferometric processing of two registered ISAR images. ISAR image registration is an important technology in InISAR three-dimensional imaging. Its purpose is to achieve the alignment of the same scattering point in different ISAR images, so that the subsequent ISAR image interference processing is performed between the same scattering points, and finally through the interference Get the 3D coordinates of the scattered points. [0003] In recent years, domestic and foreign...
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IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41G01S13/9023G01S13/9064
Inventor 蒋李兵王壮周子铂王鑫奎喻祥任笑圆郑通
Owner NAT UNIV OF DEFENSE TECH