Chirp scaling algorithm for GEO SAR based on fourth-order range equation
Chirp scaling algorithm for GEO SAR based on fourth-order range equation
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DOI：
10.1049/el.2011.1892
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发表时间：
2012-01
影响因子：
1.1
通讯作者：
M. Bao;M. Xing;Yongkang Li
中科院分区：
文献类型：
--
作者：
M. Bao;M. Xing;Yongkang Li
对于地球同步轨道（GEO）卫星上的合成孔径雷达（SAR），其航迹可以是曲线。因此，基于传统双曲距离方程（CHRE）的成像算法的有效性变得可疑。采用四阶距离方程提高GEO SAR距离历程的近似精度，提出了一种改进的Chirp Scaling算法（CSA）。仿真结果表明，在GEO情况下，该算法比基于CHRE的CSA算法具有更好的性能，具有良好的应用前景。
For a synthetic aperture radar (SAR) onboard a geosynchronous-earth-orbit (GEO) satellite, the track can be curvilinear. Thus, the validity of imaging algorithms based on the conventional hyperbolic range equation (CHRE) becomes questionable. A fourth-order range equation is adopted to improve the accuracy in the approximation of the range history for GEO SAR and a modified chirp scaling algorithm (CSA) is proposed. Simulation results show that the presented algorithm has better performance than the CHRE-based CSA in the GEO case, implying good application prospects.