A Doppler Resampling Based Imaging Algorithm for High Squint SAR with Constant Acceleration
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摘要: 针对机动平台大斜视(HS) SAR存在的方位相位系数空变特性，该文提出一种基于多普勒重采样的改进谱分析(SPECAN)成像方法。首先，对于恒加速度HS SAR，给出了一种正交坐标斜距模型，可以处理传统方法中距离走动校正(RWC)引起的坐标旋转，解决了斜距模型与信号之间的失配问题。在此基础上通过方位多普勒重采样校正相位系数的空变性，并且结合SPECAN技术实现方位向聚焦。最后，通过仿真数据验证了该文算法的有效性，与参考算法相比该文方法聚焦质量有明显提升。Abstract: A modified SPECtral ANalysis (SPECAN) algorithm based on Doppler resampling is proposed to deal with the azimuth Space-Variant (SV) phase coefficients of the High Squint (HS) SAR data acquired from maneuvering platform. Firstly, for HS SAR with constant acceleration, an orthogonal coordinate slant range model is presented, which can handle the coordinate rotation caused by the traditional method of Range Walk Correction (RWC), and solve the mismatch between the range model and the signal after RWC. Then azimuth Doppler resampling is used to correct the SV phase coefficients. The focused image is achieved by SPECAN technique. Finally, the proposed algorithm is validated by processing of simulated SAR data, and has significant improvement on focusing quality over the reference one.
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表 1 仿真参数
中心频率fc PRF 带宽Br 采样率fs 合成孔径时间Ta 16 GHz 8 kHz 80 MHz 120 MHz 0.3 s 雷达高度H 偏航角 雷达速度矢量${\text{v}}$ 雷达加速度矢量${\text{a}}$ 作用距离Rs 10 km 46° (100, 880, –300) m/s (15, –10, –5) m/s2 18 km 
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表 2 性能评估指标(dB)
性能指标 点${p_1}$ 点${p_2}$ 点${p_3}$ 参考方法 本文方法 参考方法 本文方法 参考方法 本文方法 峰值旁瓣比 –6.08 –13.32 –12.84 –13.21 –6.33 –13.09 积分旁瓣比 –7.74 –10.02 –11.38 –10.19 –7.82 –10.38
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