| 一种任意构型双基合成孔径雷达成像算法 |
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| 引用本文： | 刘玉春, 王俊, 高博, 刘保昌. 一种任意构型双基合成孔径雷达成像算法[J]. 电波科学学报, 2012, 27(5): 960-967. |
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| 作者姓名： | 刘玉春 王俊 高博 刘保昌 |
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| 作者单位： | 西安电子科技大学雷达信号处理国家重点实验室, 陕西 西安 710071 |
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| 摘 要： | 针对任意构型双基合成孔径雷达成像问题,提出了基于四阶精确传递函数的任意构型双基OMEGA-K成像算法。该算法应用四阶精确传递函数思想,首先把收发斜距历程展开至四阶泰勒级数,通过直接求解驻相点方程得到驻相点,进而获得具有较高精度的双基二维谱。通过对二维谱的处理,结合单基OMEGA-K成像算法思想,推导出任意构型的双基OMEGA-K成像算法,分析了不变区域大小。给出了算法步骤,仿真实验表明:该算法有较好的聚焦性能,可用于较为极端的双基构型。
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| 关 键 词： | 双基合成孔径雷达 OMEGA-K成像算法 四阶精确传递函数 驻相原理 双基二维频谱 |
| 收稿时间： | 2011-11-27 |
A general bistatic SAR imaging algorithm |
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| LIU Yuchun, WANG Jun, GAO Bo, LIU Baochang. A general bistatic SAR imaging algorithm[J]. CHINESE JOURNAL OF RADIO SCIENCE, 2012, 27(5): 960-967. |
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| Authors: | LIU Yuchun WANG Jun GAO Bo LIU Baochang |
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| Affiliation: | National Key Lab of Radar Siganl Processing, Xidian University, Xi'an Shaanxi 710071, China |
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| Abstract: | This paper presents a bistatic OMEGA-K imaging algorithm based on Fourth-order Extend Exact Transfer Function (EETF4) 2-D spectrum for general bistatic synthetic aperture radar(SAR) data focusing. Applying EETF4, the rang histories of transmitter and receiver are approximated by fourth-order Taylor expansions in azimuth time first. Then the point of stationary phase is derived by solving the polynomial equation which comes from the principle of stationary phase. Subsequently, an accurate bistatic 2-D spectrum is formulated. Based on the expression of the spectrum, a frequency mapping function is derived. Finally a bistatic OMEGA-K imaging algorithm is proposed and the invariance region is analyzed. Simulation results demonstrate the performance of the bistatic OMEGA-K algorithm. |
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| Keywords: | bistatic SAR OMEGA-K imaging algorithm Fourth-order Extend Exact Transfer Function (EETF4) princple of the stationary phase bistatic two-dimensional spectrum |
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