摘要
建立了同步轨道合成孔径雷达(GEOSAR)的椭圆轨道模型,对其特殊的运动特性进行了分析,重点研究了椭圆轨道条件下目标的多普勒特性.针对卫星姿态误差对多普勒参数的影响从而导致成像质量下降的问题,通过推导存在姿态误差情况下的多普勒参数表达式,发现在GEOSAR中俯仰角和横滚角对多普勒参数的影响比较大,为了保证成像质量,应尽量提高俯仰角和横滚角的测量精度,并控制它们的扰动.最后针对GEOSAR非线性运动给成像带来的困难,对SPECAN算法、结合运动补偿的RD算法和后向投影算法进行了比较和分析,证明了这3种成像方法在GEOSAR中的可行性.计算机仿真结果验证了分析结论的正确性和成像算法的有效性.
The elliptic orbit module and property of motion of geosynchronous synthetic aperture radar （GEOSAR） are analyzed. The paper discusses in detail the Doppler property of the GEOSAR target in the elliptical orbit. Satellite attitude changes have significant effects on GEOSAR imaging. By deducing the Doppler parameters expression with the satellite attitude variety, it is discovered that we should enhance the measurement precision of the pitch angle and roll angle. The nonlinear motion of the satellite orbit should be taken into account in GEOSAR imaging, so that the SPECAN algorithm, RD algorithm and back-projection algorithm are compared and analyzed, and it is proved that the three imaging approaches are feasible in GEOSAR imaging. Computer simulation results validate the conclusions obtained through analysis and the imaging method.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2010年第6期1033-1041,1064,共10页
Journal of Xidian University
基金
重点实验室基金资助项目(9140C5305020902)
关键词
合成孔径雷达
同步轨道
多普勒参数
卫星姿态
后向投影
synthetic aperture radar
geosynchronous orbits
Doppler parameter
satellite attitude
back-projection
