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Phase-difference autofocus method for synthetic aperture imaging lidar

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

Active Publication Date: 2014-10-01
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

However, in all the above-mentioned related reports [see Documents 1, 2, 3, 4, 5], there is no mention of the optimization of the phase history of the quadratic term in the azimuth direction of the radar echo signal

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  • Phase-difference autofocus method for synthetic aperture imaging lidar
  • Phase-difference autofocus method for synthetic aperture imaging lidar
  • Phase-difference autofocus method for synthetic aperture imaging lidar

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Embodiment Construction

[0060] The invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention should not be limited thereto.

[0061] see first figure 1 , figure 1 It is a schematic diagram of the steps of the synthetic aperture laser imaging radar phase difference self-focusing method of the present invention. It can be seen from the figure that the synthetic aperture laser imaging radar phase difference self-focusing method of the present invention includes the following steps:

[0062] ①The synthetic aperture laser imaging radar transmitting system transmits chirped pulse laser signals with chirped frequency modulation, which are reflected by the target after being irradiated. The reflected light waves are stored in the computer,

[0063] see again figure 2 , figure 2 It is a schematic diagram of the simplified structure of the synthetic aperture laser imaging radar and the acquisition of t...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/89G01S7/48
Inventor 孙志伟职亚楠孙建锋周煜戴恩文刘立人许倩卢智勇
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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