A kind of rd imaging method and device for non-linear frequency modulation sar
A technology of non-linear frequency modulation and imaging method, which is applied in the field of range Doppler imaging, and can solve problems such as the inapplicability of non-linear frequency modulation signals
Active Publication Date: 2020-05-08
INST OF ELECTRONICS CHINESE ACAD OF SCI
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However, the RD algorithm requires the echo signal to have the characteristics of a linear frequency modulation signal, which is not applicable to the nonlinear frequency modulation signal
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[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.
[0040]In the embodiment of the present invention, after the nonlinear frequency modulation signal is transmitted, range Fourier transform is performed on the echo data to obtain the echo data in the range frequency domain; according to the nonlinear frequency modulation signal, the range frequency domain performing range pulse compression processing on the echo data to obtain range frequency domain data compressed by the range pulse; transforming the range frequency domain data compressed by the range pulse into a range Doppler domain to obtain range Doppler domain data; Perform range migration correction RCMC and azimuth pulse compression processing sequentially on the data in the range Doppler domain to obtain data after the azimuth pulse compression processing; obtain SAR im...
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The embodiment of the invention discloses an RD (Range Doppler) imaging method and device capable of aiming at a nonlinear frequency modulation SAR (Synthetic Aperture Radar). The method comprises thefollowing steps that: after a nonlinear frequency modulation signal is emitted, carrying out range direction Fourier transform on echo data to obtain the echo data of a range frequency domain; according to the nonlinear frequency modulation signal, carrying out range direction pulse compression processing on the echo data of the range frequency domain to obtain the range frequency domain data ofthe range direction pulse compression; transforming the range frequency domain data of the range direction pulse compression to a range Doppler domain to obtain the data of the range Doppler domain; carrying out RCMC (Range Cell Migration Correction) and azimuth pulse compression processing on the data of the range Doppler domain in sequence to obtain data subjected to the azimuth pulse compression processing; and according to the data subjected to the azimuth pulse compression processing, obtaining SAR image data. Therefore, an improved RD algorithm imaging method is provided for the SAR of which the nonlinear frequency modulation signal is of an emission waveform, and an image with good focusing is obtained.
Description
technical field [0001] The present invention relates to synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging technology, in particular to a range Doppler (Range Doppler, RD) imaging method and device for non-linear frequency modulation SAR, which can be applied to non-linear frequency modulation signals as SAR imaging of transmitted waveforms at small oblique viewing angles. Background technique [0002] SAR is a high-resolution imaging radar that can obtain high-resolution radar images similar to optical photography under weather conditions with extremely low visibility. SAR is usually installed on an aircraft or satellite, and the distance and two-dimensional imaging. The linear frequency modulation (Linear Frequency Modulation, LFM) signal is the most commonly used transmission waveform in SAR. After this waveform is matched and filtered, the response function generated by the normalized PSLR (Peak Side Lobe Ratio) is -13dB. In order to suppress the height ...
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IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9004
Inventor 金国栋王宇邓云凯王伟张永伟刘开雨
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI