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A chirp scaling approach for processing squint mode SAR data

机译:一种rp斜率缩放方法,用于处理斜视模式SAR数据

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Image formation from squint mode synthetic aperture radar (SAR) is limited by image degradations caused by neglecting the range-variant filtering required by secondary range compression (SRC). Introduced here is a nonlinear FM chirp scaling, an extension of the chirp scaling algorithm, as an efficient and accurate approach to range variant SRC. Two methods of implementing the approach are described. The nonlinear FM filtering method is more accurate but adds a filtering step to the chirp scaling algorithm, although the extra computation is less than that of a time domain residual compression filter. The nonlinear FM pulse method consists of changing the phase modulation of the transmitted pulse, thus avoiding an increase in computation. Simulations show both methods significantly improve resolution width and sidelobe level, compared with existing SAR processors for squint angles above 10 deg for L-band and 20 deg for C-band
机译:斜视模式合成孔径雷达(SAR)的图像形成受到忽略二级距离压缩(SRC)所需的距离变量滤波导致的图像退化的限制。此处介绍的是非线性调频线性调频缩放,这是线性调频缩放算法的扩展,是一种有效且准确的范围变异SRC方法。描述了实现该方法的两种方法。非线性FM滤波方法更精确,但是在线性调频缩放算法中增加了滤波步骤,尽管额外的计算少于时域残差压缩滤波器。非线性FM脉冲方法包括更改发射脉冲的相位调制,从而避免了计算量的增加。仿真结果表明,与现有的SAR处理器相比,对于L波段10度以上和C波段20度以上的斜视角度,两种方法均显着提高了分辨率宽度和旁瓣水平

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