摘要
Among Synthetic Aperture Radar(SAR)image formation algorithms,the chirp scaling algorithm(CSA)is computationally highly efficient and has been practically used.In this paper,how to implement the subaperture extended CSA in a high resolution spotlight mode SAR is studied in detail.The procedures such as subaperture processing and azimuth processing are discussed.According to the problems presented when using the method(A.Moreira,et al,1996)to process spotlight SAR data,full formula expressions suitable for high squinted angles is presented.While point target simulation is analyzed,the method is validated by E SAR raw data.The results can be directly implemented in the design of SAR processors.
在合成孔径雷达(SARSynthetic Aperture Radar)的成像算法中.Chirp Scaling成像算法具有计算效率高的优点.因此得到了较为广泛的应用。详细研究了子孔径扩展Cbirp Scaling算法在高分辨率聚束模式SAR中的应用,包括子孔径划分和方位向处理问题,针对A.Moreira等1996年所提算法在处理聚束SAR数据时所产生的问题,给出了经过改进的适合于大斜视角处理的整个计算过程的完整表达式。在给出点目标仿真的同时,利用E-SAR实际数据对所述方法进行了验证,结果对具体的兼容条带和聚東两种工作模式的SAR处理机设计具有一定的参考价值.
基金
National Natural Science F oundation of china(68931040)
