前斜视机载SAR成象处理的RD算法研究

Study on RD Algorithm Used in Squint Mode Airborne SAN Processing

本文研究了用距离－多卜勒（ＲＤ）算法来实现前斜视机载合成孔径雷达（ＳＡ）成象处理．给出了机载斜视ＳＡＲ的空间几何模型和回波信号模型，详细分析了ＳＡＲ在斜视情况下成象处理必须进行二次距离压缩（ＳＲＣ）的机理，并研究了一种改进的ＳＲＣ方法（ＳＩＭ），此方法能适应于斜视角更大的情况．针对不同的斜视情况进行了计算机仿真，最后指出了ＲＤ算法处理斜视ＳＡＲ的局限性及理由。

paper studies range-Doppler (RD) algorithm for the azimuth correlation in the squint mode air borne synthetic aperture radar (SAR). The model of squint mode airborne SAR spatial geometry and eche re sponse is given. The reason that second ranges compression (SRC) is needed for squint mode is analyzed. The modified method (SIM) is studied. This mehtod is suitable for lager squint angle situation. The computer simulation is done for various squint angles. At last, This paper points out the limitation and reason of RD algorithm for squint mode SAR processing.