基于短时谱分析的SISAR运动参数估计及侧影像定标  

Motinon Parameter Estimation and Shadow Profile Scale for SISAR Based on Short Time Spectrum Analysis

作　　者：张卫娥[1] 赵永波[1] 杨莉[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《航空计算技术》2007年第4期77-81,共5页Aeronautical Computing Technique

摘　　要：针对解目标运动参数、多普勒频率和角度之间的非线性方程运算量大且极易陷入局部极值的问题,提出一种估计阴影逆合成孔径雷达(SISAR)目标运动参数的新方法。该方法通过短时谱分析与抽取叠代相结合,提高了估计精度,减少了运算量。在对目标侧影像进行定标时,利用恢复的侧影轮廓中线相位的差分均值消除目标相对于雷达的非线性转动引起的附加相位,获得几乎不受目标运动参数影响的侧影轮廓中线的高度和长度。仿真验证了所提方法的可行性。The conventional solution to the non -linear equation of the target motion parameters, Doppler frequency and angle needs a great amount of computation and gets the extremum in local easily. A new method of estimating target motion parameters for SISAR is proposed in this paper. The combination of short time spectrum analysis, extraction and iteration has a high estimation precision and a little amount of computation. Then the shadow profile is scaled, the mean of differentiation of the midline phase of shadow profile is used to eliminate the additive phase, which is brought by the non - linear turn of the target. The height and length of shadow profile are hardly influenced by the variety of the target motion parameters. Finally, the feasibility of these methods is shown by the results of computer simulation.

关 键 词：短时谱分析 多普勒频率 侧影像定标 相位差分 

分 类 号：TN957.52[电子电信—信号与信息处理]