A Correction Method of Missile-borne SAR Image
An image correction and missile-borne technology, which is applied in the direction of instruments, measuring devices, and the use of re-radiation, can solve the problems of incompatibility, unfavorable engineering realization, and large amount of calculation.
Active Publication Date: 2021-05-04
THE GENERAL DESIGNING INST OF HUBEI SPACE TECH ACAD
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When performing image matching, if the deformation is not corrected, there will be errors in image matching, or even failure to match
[0004] At present, most of the correction methods of missile-borne SAR images are to deduce the complex coordinate relationship between the coordinates of the ground scene and the coordinates of the final SAR image through the imaging geometric configuration, and perform geometric correction. In the projection process, complex coordinate mapping relationships need to be derived according to the imaging configuration, and all points on the imaging plane need to be mapped point by point, which requires a large amount of calculation and is not conducive to engineering implementation
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[0078] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0079] see figure 1 As shown, the embodiment of the present invention provides a missile-borne SAR image correction method, which includes:
[0080] Step 1. Establish the ground coordinate system O-x-y-z according to the parameters of the projectile at the moment of the aperture center.
[0081] The parameters of the projectile at the center of the imaging aperture include projectile height, oblique angle of view, beam azimuth, beam elevation angle, velocity information, etc. Among them, the Oxz plane is on the ground plane, Ox points to the direction of velocity projection on the ground, Oy is vertical to the ground, and Oz, Ox and Oy satisfy the right-hand rule.
[0082] Step 2: Set up the image coordinate system P-xp-yp with the center point P of the beam as the origin.
[0083] Preferably, the image coordinate system P-xp-yp can be esta...
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The invention discloses a missile-borne SAR image correction method, which relates to the technical field of radar signal processing. The method comprises: establishing a ground coordinate system; establishing an image coordinate system; reading echo signals to obtain a focused oblique plane image; The image grid is established in the coordinate system, and the coordinates of each point on the image grid are obtained according to the real-time image size and resolution on the ground; the coordinates of each point on the image grid are rotated and transformed to obtain the coordinates of the point in the ground coordinate system; calculation The distance and Doppler information of the points on the image grid on the imaging oblique plane are converted into the row information and column information of the corresponding oblique plane image; two-dimensional sinc interpolation is performed on the row information and column information. The missile-borne SAR image correction method of the present invention adopts the back projection method to accurately calculate the distance and Doppler information corresponding to each point on the image grid by establishing the image grid model on the ground, and accurately obtain the distance and Doppler information within the range of the image grid. Deformation-free SAR image.
Description
technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a method for correcting missile-borne SAR images. Background technique [0002] Synthetic Aperture Radar (SAR) is a high-resolution imaging radar. Because of its advantages of high resolution, all-weather and penetrability to some ground objects, as a new imaging tool, missile-borne SAR Seekers are playing an increasing role in the field of precision guidance. [0003] The missile-borne radar seeker adopts the SAR imaging mode in the missile descent section to obtain the two-dimensional high-resolution SAR image of the ground scene in real time, and then match the real-time image with the reference template map to obtain the position information of the matching target point in the reference map. Based on the geometric relationship, the precise distance between the projectile and the target point can be obtained, and multiple accurate distances can be obtained by ...
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IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41
Inventor 李芬芬黄龙侍伟伟周世平胡哲桂阳靳永亮韩建莉石稳李姣
Owner THE GENERAL DESIGNING INST OF HUBEI SPACE TECH ACAD