调频连续波SAR MCM成像算法

MCM Algorithm for FMCW SAR Data Processing

针对调频连续波SAR实时成像问题,提出了一种新的"乘法-卷积-乘法"(MCM)成像算法。在详细分析调频连续波SAR信号特征的基础上,算法采用MCM方法完成距离向处理,仅需FFT和乘法运算即可实现去斜率信号的时间尺度变换,从而实现距离徙动的精确校正。采用步进变换实现方位向压缩,不需要几何校正即可获得高质量的压缩效果。算法运算效率高,适合实时成像处理。给出了算法的推导过程和实现步骤,通过仿真试验证明了算法的正确性和有效性。

This paper presents a new multiply-convolution-multiply （MCM） processing algorithm for frequency modulated continuous wave synthetic aperture radar （FMCW SAR） data processing. Based on the FMCW SAR signal characteristics, the algorithm performs the range cell migration correction for dechirped raw data without interpolation by using a novel MCM operation. The azimuth pro- cessing is based on a step transform approach without geometric resampling operation. The algorithm is efficient and can be used in real time image formation. The complete derivation of the algorithm is given. Simulation results are presented to demonstrate the validity of the algorithm.