基于级数反演的弹载SAR下降段CZT成像算法

周鹏; 周松; 熊涛; 李亚超; 邢孟道

doi:10.3724/SP.J.1146.2010.00452

基于级数反演的弹载SAR下降段CZT成像算法

doi: 10.3724/SP.J.1146.2010.00452

基金项目:

国家自然科学基金重大项目(60890072)和新世纪优秀人才支持计划(NCET-06-0861)资助课题

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出版历程
- 收稿日期: 2010-05-07
- 修回日期: 2010-08-30
- 刊出日期: 2010-12-19

A Chirp-Z Transform Imaging Algorithm for Missile-borne SAR with Diving Maneuver Based on the Method of Series Reversion

摘要

摘要: 导弹下降段飞行速度快、飞行轨迹复杂，并且弹上成像实时性要求较高，给弹载SAR成像算法提出了新的要求。针对上述问题，该文提出了基于级数反演的CZT成像算法。文中首先给出了下降段点目标斜距表达式，并用泰勒级数对斜距进行高阶展开，接着用级数反演法得到了信号2维频谱高阶近似表达式，然后详细分析了频谱中各项的空变性对成像的影响，并在此基础上推导了改进的CZT成像算法并分析了其运算量。该算法能够精确校正空变的距离徙动，所有操作都由快速傅里叶变换和相位点乘完成，具有较高的效率。仿真结果证明，该文算法能够在下降段实现全孔径高精度成像。
- 弹载SAR /
- 级数反演 /
- CZT算法
Abstract: Due to the high velocity, the complicated flight path and the need of real time processing during the diving maneuver, a new algorithm for the missile-borne SAR imaging is challenging. Thus, a new CZT (Chirp-Z Transform) imaging algorithm based on the method of series reversion is proposed in this paper. Firstly, the point target range function is established, and then it is expanded using the Taylor series. Secondly, the high order approximate expression of the tow-dimensional spectrum is obtained via the method of series reversion, based on which the mended CZT imaging algorithm is derived and the computation load is analyzed then. The algorithm is able to correct the spatially varying range-migration. Because all the operations are composed of the fast Fourier transform and the phase multiplication, the algorithm is efficient. The result of the point targets simulation shows that high resolution image is obtained by using the algorithm proposed with the diving maneuver in entire aperture.
- Missile-borne SAR /
- Method of series reversion /
- CZT (Chirp-Z Transform) algorithm

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