Methods for differencing and self-focusing phases of synthetic aperture laser imaging radar

A technology of synthetic aperture laser and imaging radar, which is applied in the direction of instruments, measuring devices, and utilization of re-radiation, and can solve problems such as optimization of the azimuth of radar echo signals that are not mentioned
CN103163531AActive Publication Date: 2013-06-19SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Publication Date
2013-06-19

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Abstract

The invention discloses methods for differencing and self-focusing phases of a synthetic aperture laser imaging radar. According to a principal, an azimuth phase signal with a noise phase is extracted from a radar echo signal subjected to range focusing and shifted, the shifted phase signal and an unshifted phase signal are differenced, a signal obtained through differencing is sequentially subjected to Fourier transformation, band-pass filtering and inversion Fourier transformation to obtain signals, the obtained signals are sampled and accumulated at equal intervals to obtain an optimized azimuth quadratic phase, and the optimized azimuth quadratic phase is subjected to azimuth focusing to image a target. By the method, quadratic phase process crucial to target aperture synthesis is optimized, so that the imaging quality can be improved; and the method is important technological improvement of the synthetic aperture laser imaging radar.
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Description

technical field

[0001] The invention relates to a synthetic aperture laser imaging radar, in particular to a synthetic aperture laser imaging radar phase difference self-focusing method, which is used for radar echo signal focus imaging processing. Background technique

[0002] The principle of synthetic aperture laser imaging radar is taken from the principle of synthetic aperture radar in the radio frequency field, and it is the only optical imaging method reported abroad that can obtain centimeter-level resolution at long distances. The emission laser of the synthetic aperture laser imaging radar adopts optical frequency linear modulation, that is, chirp modulation, and the optoelectronic heterodyne reception adopts the deskewing demodulation method, that is, the same chirp emission laser is used as the heterodyne local oscillator beam, so the distance An echo difference frequency signal that contains distance information and phase history information in the azimuth direc...

Claims

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