临近空间慢速平台SAR结合运动补偿的SCFT算法  

SCFT processing algorithm based on motion compensation for near space slow platform SAR

作　　者：王晓峰[1] 董臻[1] 梁甸农[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《系统工程与电子技术》2008年第10期1869-1873,共5页Systems Engineering and Electronics

摘　　要：针对临近空间慢速平台SAR轨迹运动偏差的空变性进行了分析。在二维频率域利用系统传输函数(STF)和变尺度傅里叶变换(SCFT)处理算法有效补偿了距离迁移和关于快时间波数的高阶相位,指出在运动补偿过程中,可将轨迹运动偏差分解成空不变项和空变项。在二维频率域,结合一阶、二阶运动误差补偿的方法,提出了临近空间慢速平台SAR结合运动补偿的SCFT处理算法。最后,通过计算机仿真,验证了本算法的正确性。The space-variant property of trajectory deviations in near space slow platform SAR is analyzed. Effective compensation for range migration compression and high step phase is implemented by virtue of the system transform function and SCFT processing algorithm in two-dimensional frequency domain. It is shown that the range error can be separated into space invariant and variant contributions, which can be compensated by the first order and second-order motion compensation processing. Integrated with the motion compensation theory, this paper presents an SCFT processing algorithm based on motion compensation for near space slow platform SAR in two dimensional frequency domain. Finally, the analysis and scheme are validated by the result on the simulated data.

关 键 词：临近空间 慢速平台 合成孔径雷达 系统传输函数 SCFT处理算法 运动补偿 二次距离压缩 距离单元徙动 

分 类 号：TN957[电子电信—信号与信息处理]