Method for preprocessing high speed platform ultra-high resolution stop and reserves (SAR) data
A technology of ultra-high resolution and data preprocessing, which is applied in the preprocessing of ultra-high resolution SAR data of high-speed platforms and ultra-high resolution SAR imaging of high-speed motion platforms. It can solve the problems of inapplicability and low imaging accuracy, and achieve High resolution, the effect of eliminating image ghosting phenomenon
Active Publication Date: 2012-03-28
XIAN CETC XIDIAN UNIV RADAR TECH COLLABORATIVE INNOVATION INST CO LTD
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[0005] The purpose of the present invention is to provide a high-speed platform ultra-high resolution SAR data preprocessing method to overcome the traditional SAR imaging technology for high-speed platform ultra-high resolution SAR echo data imaging accuracy is not high, and the existing frequency modulation continuous wave SAR data The processing method is not suitable for the problem of ultra-high resolution SAR echo data processing of high-speed platform
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[0033] refer to figure 1 , the present invention is as follows to the preprocessing step of SAR data:
[0034] Step 1, receiving SAR echo data, and performing carrier frequency removal processing on the echo data by using an existing orthogonal demodulation method.
[0035] Step 2, judge whether the azimuth spectrum of the SAR echo data is aliased, when the azimuth Doppler bandwidth B a When it is greater than the azimuth sampling rate PRF, it is judged that the SAR echo data has azimuth spectrum aliasing, and then go to step 3, otherwise go to step 4.
[0036] Step 3, performing azimuth defuzzification processing on the SAR echo data;
[0037] 3.1 By combining the SAR echo data with the quadratic phase reference function S that varies with distance and frequency ref Perform convolution to realize non-aliasing of SAR echo azimuth spectrum;
[0038] The expression of the quadratic phase reference function is:
[0039] S ref =...
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The invention provides a method for preprocessing high speed platform ultra-high resolution stop and reserves (SAR) data, mainly solving the problem that the traditional SAR imaging technology has low echo imaging precision of the high speed platform ultra-high resolution SAR. The realizing process comprises the following steps of: firstly, judging whether an SAR echo data azimuth frequency spectrum is overlapped, carrying out azimuth defuzzification treatment on the SAR echo with overlapped azimuth frequency spectrum; and then carrying out a go-stop movement assuming judgment on the SAR echodata, carrying out a phase compensation on the SAR echo data which do not satisfy the go-stop movement assuming judgment, and transforming the SAR echo data into the SAR echo constructed based on thego-stop movement assumption. The invention develops the application range of the traditional SAR imaging technology, through the preprocess of the invention, the high speed platform ultra-high resolution SAR data can continuously use the traditional SAR imaging technology assumed based on the go-stop movement assumption for imaging; and the invention can be applied to the ultra-high resolution SAR imaging process of the satellite-based, the missile-borne and the hypersonic unmanned planes.
Description
technical field [0001] The invention belongs to the field of radar signal processing, and relates to a preprocessing method for ultra-high resolution SAR data of a high-speed platform, which is used for ultra-high-resolution SAR imaging of a high-speed motion platform whose motion platform is a satellite, a missile, and a supersonic unmanned aerial vehicle. Background technique [0002] Synthetic Aperture Radar (SAR) imaging belongs to high-resolution imaging technology. In the direction of distance, it obtains high resolution by transmitting large-bandwidth signals; in the direction of azimuth, a moving sensor is used to simulate a long antenna array to obtain Better resolution in direction. In the past half a century, the theory and technology of SAR imaging have been greatly developed, and have been widely used, such as remote sensing and map surveying. [0003] Traditional SAR imaging methods include back projection algorithm, range migration algorithm for ultra-wideban...
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IPC IPC(8): G01S13/90G01S7/02
Inventor 刘燕孙光才邢孟道保铮
Owner XIAN CETC XIDIAN UNIV RADAR TECH COLLABORATIVE INNOVATION INST CO LTD