Extended NCS Based on Method of Series Reversion for Imaging of Highly Squinted SAR

Extended NCS Based on Method of Series Reversion for Imaging of Highly Squinted SAR
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基于级数反演方法的大斜视SAR成像扩展NCS

DOI:
10.1109/lgrs.2010.2084562
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发表时间:
2011-05
影响因子:
4.8
通讯作者:
Wu Yirong
Wu Yirong
中科院分区:
工程技术2区
文献类型:
--
作者:
Sun Lu;Bao Zheng;Xing Mengdao;Liu Yan;Sun Guangcai;Wu Yirong

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在距离分辨率和斜视角较高的情况下,现有的线性调频定标算法(CSA)和非线性线性调频定标算法(NCSA)获得高质量图像的能力有限。问题源于范围依赖性(即,空变)三次和更高阶的距离频率项,这需要充分的补偿或空变滤波,在合成孔径雷达传递函数的相位,这封信的目的是处理这个问题。首先,一个不等式被引入到评估的最高阶的距离频率项的空间变化的系数必须考虑。然后,基于级数反演方法,提出了一种扩展的NCS,该方法可以削弱所考虑的距离频率项的距离相关性,实现精确的距离单元迁移校正和距离压缩。仿真结果验证了所提出的方法的有效性。
In the case of high range resolution and squint angle, current chirp scaling algorithm (CSA) and nonlinear CSA (NCSA) have a finite ability to achieve high-quality images. The problem stems from a range-dependent (i.e., space-variant) cubic- and higher order terms of range frequency, which require sufficient compensation or space-variant filtering, in the phase of the synthetic aperture radar transfer function, and this letter aims at dealing with this problem. First, an inequation is introduced to evaluate the highest order of range frequency terms whose space-variant coefficient has to be taken into account. Then, based on the method of series reversion, this letter proposes the extended NCS which can weaken the range dependence of the considered range frequency terms and achieve accurate range cell migration correction and range compression. Simulation results are presented to validate the proposed method.
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