變波門大斜視滑動聚束SAR成像關鍵技術分析

聶鑫

doi:10.11999/JEIT160812

變波門大斜視滑動聚束SAR成像關鍵技術分析

doi: 10.11999/JEIT160812

聶鑫^1, ,

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出版歷程
- 收稿日期: 2016-07-28
- 修回日期: 2016-11-09
- 刊出日期: 2016-12-19

Research on Key Technique of Highly Squinted Sliding Spotlight SAR Imaging with Varied Receiving Range Bin

NIE Xin^{1
, ,}

摘要

摘要: 大斜視高分辨率SAR成像中，改變開啟波門的操作可以在保證距離測繪帶寬度的情況下減小錄取回波的數(shù)據(jù)率，滑動聚束的掃描模式可以在保證高分辨率的情況下擴大方位場景范圍。但是變波門后只能獲得交錯的距離徙動曲線，而滑動聚束的掃描方式容易引起方位模糊。該文研究了變波門大斜視滑動聚束模式下SAR成像的關鍵技術，提出分子孔徑升采樣的解模糊算法以及基于空域波束分割的二級極坐標格式算法(PFA)，將對波門變化的補償融入運動補償處理的過程中，通過先波束分割后子圖像拼接的方法突破了PFA平面波前的近似對成像場景尺寸的限制，顯著擴大了傳統(tǒng)PFA的有效成像場景范圍，使其適用于大斜視滑動聚束模式下的大場景成像。實測數(shù)據(jù)處理表明了算法對大場景變波門數(shù)據(jù)的有效性。
- 大斜視高分辨率SAR /
- 滑動聚束 /
- 變波門 /
- 波束分割 /
- 二級極坐標格式算法
Abstract: In highly squinted and high resolution SAR, the data receiving range bin can be continually adjusted to minimize the sampled data in echo collection, but the staggered range cell migration needs extra processing to be eliminated. To enlarge the imaging scene size with a relatively high resolution, sliding spotlight working mode could be used, yet this mode may cause azimuth ambiguity. In this paper, the key technique of highly squinted sliding spotlight SAR imaging with varied receiving range bin is investigated, a sub-aperture based upsampling ambiguity-resolving method is utilized and a new beam segmentation based 2-step PFA method is proposed, which incorporates the stagger compensation to the procedure of motion compensation. The method performs beam segmentation via digital spotlighting preprocessing firstly to generate multiple full-resolution phase histories of smaller image patches, which allow the approximation of planar wavefront in traditional PFA. PFA is used to produce focused fine resolution image for each small patch．Finally, all focused image patches are seamed together to get a full image. This divide-and-conquer approach breaks the image size limit in traditional PFA, and extensively enlarges the valid focused scene suitable for sliding spotlight mode. This new algorithm is validated to be effective and efficient via real data experiments．
- Highly squinted and high resolution SAR /
- Sliding spotlight /
- Varied receiving range bin /
- Beam segmentation /
- 2-step PFA

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參考文獻(20)

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