摘要: |
在分析原有ECS算法的基础上,提出了一种适合于星栽聚束SAR成像的子孔径ECS算法。该算法对数据进行子孔径划分,可降低系统对PRF及运算存储量的要求。距离压缩采用斜视等效距离模型,实现精确的距离徙动校正。方位压缩采用方位scaling和频谱分析来实现,并分析推导了合理的方位scaling因子取值。最后,通过仿真验证了算法的有效性。 |
关键词: 合成孔径雷达 子孔径 聚束式 ECS算法 |
DOI:10.3969/j.issn.1001-893X. |
投稿时间:2005-07-15修订日期:2005-10-11 |
基金项目: |
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An Improved Spaceborne Spotlight SAR Sub-aperture ECS Algorithm |
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Abstract: |
Based on the analysis of the existing extended chirp scaling(ECS) algorithms,a sub-aperture ECS algorithm is proposed for spaceborne spotlight SAR imaging.The algorithm divides echo-wave data into several sub-apertures data to reduce demands of PRF and memory of system.Squinted equivalent range model is used in range impulse impressing to achieve range migration correction accurately.Azimuth scaling and SPECAN methods are used in azimuth impulse impressing,and rational value of azimuth scaling factor is analyzed.Finally,the validity of the algorithm is testified by computer simulations. |
Key words: synthetic aperture radar(SAR),sub-aperture,spotlight,ECS algorithm |