线振动对合成孔径激光雷达成像的影响分析

Analysis of Effects of Line Vibration on Imaging Quality of Synthetic Aperture Ladar

合成孔径激光雷达采用激光作为信号载波,通过孔径合成技术实现高分辨率成像。但是平台的振动会对激光雷达图像质量产生影响。针对平台线振动对合成孔径激光雷达影响进行了分析,通过对带有振动的合成孔径激光雷达瞬时斜距展开,可以将线振动的影响分为沿航线振动影响和垂直航线振动影响,其中沿航线振动对图像质量的影响可以忽略,而垂直航线的振动对图像质量影响敏感,会导致方位向散焦而无法成像。最后通过仿真验证了分析结果。

Synthetic aperture ladar（SAL）,whose carrier is laser,makes use of synthetic aperture processing to improve the resolution of images.Vibration from the platform of SAL will affect on the imaging quality of SAL.The effects of line vibration on the imaging quality are analyzed.Firstly,instantaneous range of synthetic aperture ladar with vibration is unwraped and the effect of vibration is divided into two classes,the along-track and the cross-track one.After analysis,the effect of the along-track vibration can be ignored while the cross-track one cannot.And the vibration only affects the azimuth direction result in defocusing of the azimuth and the imaging quality.Finally,the simulations prove the validity of the analysis.