变波门大斜视滑动聚束SAR成像关键技术分析

聂鑫

doi:10.11999/JEIT160812

变波门大斜视滑动聚束SAR成像关键技术分析

doi: 10.11999/JEIT160812

聂鑫^1, ,

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出版历程
- 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: 大斜视高分辨率SAR成像中，改变开启波门的操作可以在保证距离测绘带宽度的情况下减小录取回波的数据率，滑动聚束的扫描模式可以在保证高分辨率的情况下扩大方位场景范围。但是变波门后只能获得交错的距离徙动曲线，而滑动聚束的扫描方式容易引起方位模糊。该文研究了变波门大斜视滑动聚束模式下SAR成像的关键技术，提出分子孔径升采样的解模糊算法以及基于空域波束分割的二级极坐标格式算法(PFA)，将对波门变化的补偿融入运动补偿处理的过程中，通过先波束分割后子图像拼接的方法突破了PFA平面波前的近似对成像场景尺寸的限制，显著扩大了传统PFA的有效成像场景范围，使其适用于大斜视滑动聚束模式下的大场景成像。实测数据处理表明了算法对大场景变波门数据的有效性。
- 大斜视高分辨率SAR /
- 滑动聚束 /
- 变波门 /
- 波束分割 /
- 二级极坐标格式算法
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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参考文献(20)

TSUNODA S I and PACE F. Lynx: A high-resolution synthetic aperture radar[J]. SPIE, 1999, 3704: 1-8. doi: 10.1117/12.354602.

SLOAN G R and DUBBERT D F. Affordable miniaturized SAR for tactical UAV applications[J]. SPIE, 2004, 5408: 74-83. doi: 10.1117/12.541564.

LECOZ D, DUPAS J, DUPLESSIS O, et al. Development status of the ONERA airborne SAR facilities (RAMSES)[C]. The European Conference on Synthetic Aperture Radar, Astrium Friedrichshafen, 1998.

FERNANDEZ P D. The ONENRA RAMSES SAR system[C]. IEEE International Geoscience and Remote Sensing Symposium, Toronto, Canada, 2002, 3: 1723-1725.

CANTALLOUBE H and COLIN E. The ONERA RAMSES SAR: Latest significant results and future developments[C]. IEEE Radar Conference, New York, USA, 2006: 518-524. doi: 10.1109/RADAR.2006.1631849.

CANTALLOUBE H and FERNANDEZ P D. Airborne X-band SAR imaging with resolution: Technical challenge and preliminary results[J]. IEE Proceedings Radar, Sonar and Navigation, 2006, 153(2): 163-176. doi: 10.1049/ ip-rsn:20045097.

ENDER J H G and BERENS P. Multi channel SAR/MTI system development at FGAN: From AER to PAMIR[C]. The International Geoscience and Remote Sensing Symposium, Toronto, Canada, 2002: 1679-1701. doi: 10.1109/IGARSS. 2002.1026225.

BRENNER A R and ENDER J H G. First experimental results achieved with the new very wideband SAR system PAMIR[C]. The European Conference on Synthetic Aperture Radar, Cologne, Germany, 2002: 4-6.

聂鑫, 雷万明, 沈石坚. 高分辨率星载滑动聚束SAR成像方法研究[J]. 电子技术与软件工程, 2016(4): 71-73.

NIE Xin, LEI Wanming, and SHEN Shijian. The

investigation of high-resolution sliding-spotlight SAR

imaging algorithms[J]. Electronic Technology Software Engineering, 2016(4): 71-73.

MINH P N. Range cell migration correction for phase error compensation of highly squinted SAR[C]. The European Conference on Synthetic Aperture Radar, 2014, Berlin, Germany, 2014: 81-84.

YANG Jun, SUN Guangcai, and XING Mengdao. A subaperture imaging algorithm to highly squinted TOPS SAR[C]. The European Conference on Synthetic Aperture Radar, 2014, Berlin, Germany, 2014: 398-401.

WU Yufeng, XING Mengdao, SUN Guangcai, et al. An azimuth resampling based imaging algorithm for highly squinted sliding spotlight and TOPS SAR[C]. The European Conference on Synthetic Aperture Radar, 2014, Berlin, Germany, 2014: 406-409.

SUN Zhichao, WU Junjie, LI Zhongyu, et al. Highly squint SAR data focusing based on keystone transform and azimuth extended nonlinear chirp scaling[J]. IEEE Geoscience and Remote Sensing Letters, 2014, 12(1): 145-149. doi: 10.1109/ LGRS.2014.2329554.

SOUMEKH M. Synthetic Aperture Radar Signal Processing with Matlab Algorithm[M]. New York: Wiley, 1999: Chapter 1.

SOUMEKH M, Nobles D A, Wicks M C, et al. Signal processing of wide bandwidth and wide beamwidth P-3 SAR data[J]. IEEE Transactions on Aerospace and Electronic Systems, 2001, 37(4): 1122-1141. doi: 10.1109/7.976954.

聂鑫. SAR超高分辨率成像算法研究[D]. [博士论文], 南京航空航天大学, 2010.

NIE Xin. Study on ultra-high resolution SAR imaging algorithms[D]. [Ph.D. dissertation], Nanjing University of Aeronautics and Astronautics, 2010.

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