Synthetic aperture ladar motion compensation method based on symmetrical triangular linear frequency modulation continuous wave

被引：6
作者：
Wang, Shuai [1 ,2 ,3 ]
Wang, Bingnan [1 ,2 ]
Xiang, Maosheng [1 ,2 ,3 ]
Sun, Xiaofan [1 ,2 ,3 ]
Xu, Weidi [1 ,2 ,3 ]
Wu, Yirong [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, Aerosp Informat Res Inst, Beijing 100094, Peoples R China
[2] Natl Key Lab Microwave Imaging Technol, Beijing 100190, Peoples R China
[3] Univ Chinese Acad Sci, Sch Elect Elect & Commun Engn, Beijing 100049, Peoples R China
来源：
OPTICS COMMUNICATIONS | 2020年 / 471卷
关键词：
Synthetic Aperture Ladar (SAL); Motion compensation; Symmetrical triangular linear frequency modulation continuous wave (T-FMCW); Cramer-Rao lower bound; RESOLUTION; ERROR; RADAR;
D O I：
10.1016/j.optcom.2020.125901
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Synthetic Aperture Ladar (SAL) has the ability to achieve fast high-resolution imaging due to the characteristics of ultra-high resolution and ultra-short synthetic aperture time. However, because synthetic aperture ladar operates in the near-infrared band and the operating wavelength is extremely short, small variations in flightpath can produce artifacts in the phase history that corrupt SAL image generation. This work proposes a motion compensation method based on symmetrical triangular linear frequency modulation continuous wave (T-FMCW) combining with Phase Gradient Autofocus (PGA). Firstly, the ambiguity function of T-FMCW is deduced and its characteristics are analyzed. Then the principle of velocity measurement and Cramer-Rao lower bound of speed estimation error based on this waveform are given. T-FMCW is used to estimate the radial velocity error of the platform in SAL system, and then the radial motion error is estimated by integration along azimuth to realize coarsely focused SAL image. For the coarsely focused SAL image, the residual motion error is extracted to improve the image quality by using PGA. The effectiveness and accuracy of the method is verified by simulation experiments.
引用
收藏
页数：9
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