Imaging method for fixed station bistatic synthetic aperture radar
A synthetic aperture radar, bistatic technology, applied in the field of radar, can solve problems such as two-dimensional space variability
Active Publication Date: 2013-08-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0007] The purpose of the present invention is to study and design an OS-BSAR imaging processing method for the defects in the background technology, to overcome the two-dimensional and spatial variability of the traditional SAR imaging method and the existing fixed-station bistatic SAR imaging method for OS-BSAR data processing. question
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[0067] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0068] The present invention mainly adopts the mode of simulation experiment to verify, and the simulation verification platform is Matlab2010. The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0069] The system structure adopted in this embodiment is as follows figure 2 As shown, the system coordinate system takes the imaging center target point O as the coordinate origin, the platform moves along the y-axis, the x-axis is the direction tangent to the track, and the z-axis is the direction vertical to the ground.
[0070] The schematic flow chart of the fixed station bistatic synthetic aperture radar imaging method of the present invention is as follows figure 1 As shown, the specific process is as follows:
[0071] Step 1: Imaging system parameter init...
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The invention discloses an imaging method for fixed station bistatic synthetic aperture radar, which aims at the problem of two-dimensional spatial-variant properties when operating system-bistatic synthetic aperture radar (OS-BASR) data processing is performed. By the method provided by the invention, after a point target reference spectrum is obtained, a final image is obtained by performing polynomial expansion on the obtained point target reference spectrum, merging expanded phases to generate a scale transformation factor, and performing mutative-scale Fourier inverse transform in the distance direction, and performing Fourier inverse transform and phase compensation in an azimuth direction. According to the imaging method provided by the invention, after the scale transformation factor in the distance direction is obtained, the mutative-scale Fourier inverse transform is performed in the distance direction, and the Fourier inverse transform and the phase compensation are performed in the azimuth direction, so that two-dimensional spatial-variant correction is finished; the problem of the spatial-variant properties in the azimuth direction caused by the conventional SAR imaging method and the conventional fixed base bistatic SAR imaging method aiming the OS-BSAR data processing is solved by the mutative-scale Fourier inverse transform specifically; and moreover, only multiplication and fast Fourier transform are utilized, so that the processing efficiency is high.
Description
technical field [0001] The invention belongs to the technical field of radar, and in particular relates to an imaging method of a fixed station bistatic SAR in a synthetic aperture radar imaging technology. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, all-weather modern high-resolution microwave remote sensing imaging radar, which uses the relative motion between the radar antenna and the target area to obtain high spatial resolution. Synthetic aperture radar has played an increasingly important role in military reconnaissance, topographic mapping, vegetation analysis, ocean and hydrological observation, environmental and disaster monitoring, resource exploration, and detection of crustal changes. [0003] Bistatic SAR is a new radar system. The system’s transmitting station and receiving station are placed on different platforms. The characteristics of separate sending and receiving make it have many outstanding advantages and characterist...
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IPC IPC(8): G01S13/90
Inventor 武俊杰李中余黄钰林杨建宇李文超夏永红
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA