基于子空间正交的阵列干涉SAR系统相位中心位置定标方法

卜运成; 王宇; 张福博; 冀广宇; 陈龙永; 梁兴东

doi:10.12000/JR18007

基于子空间正交的阵列干涉SAR系统相位中心位置定标方法

DOI: 10.12000/JR18007

卜运成^1,2,3,,
王宇^1,2,3,,
张福博^1,2,,
冀广宇^1,2,3,,
陈龙永^1,2,3,,
梁兴东^1,2,3, ,

①.
中国科学院电子学研究所北京 100190
②.
微波成像技术国家级重点实验室北京 100190
③.
中国科学院大学北京 100049

基金项目: 国家部委基金

详细信息

作者简介:
卜运成(1991–)，男，湖南人，电子科技大学学士，中国科学院电子学研究所博士研究生，主要研究方向为多通道合成孔径雷达3维成像、阵列干涉合成孔径雷达系统定标。E-mail: buyuncheng13@mails.ucas.ac.cn

王宇：王宇(1976–)，男，博士，中国科学院电子学研究所副研究员，研究方向为机载合成孔径雷达定标和雷达信号处理。E-mail: wangyu@mail.ie.ac.cn

张福博(1988–)，男，河北人，博士，中国科学院电子学研究所助理研究员，研究方向为多通道合成孔径雷达3维成像。E-mail: zhangfubo8866@126.com

冀广宇(1988–)，男，辽宁人，中国科学技术大学学士，中国科学院电子学研究所博士研究生，研究方向为机载合成孔径雷达信号处理。E-mail: gyji@mail.ustc.edu.cn

陈龙永(1979–)，男，安徽人，中国科学院电子学研究所博士，研究员，研究方向为新概念雷达系统设计与实现。E-mail: lychen@mail.ie.ac.cn

梁兴东(1973–)，男，陕西人，北京理工大学博士，中国科学院电子学研究所研究员，研究方向为高分辨率合成孔径雷达系统、干涉合成孔径雷达、成像处理及应用、实时数字信号处理等。E-mail: xdliang@mail.ie.ac.cn

通讯作者:
梁兴东 xdliang@mail.ie.ac.cn

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出版历程
- 收稿日期: 2018-01-25
- 修回日期: 2018-05-18
- 网络出版日期: 2018-06-28

Antenna Phase Center Calibration for Array InSAR System Based on Orthogonal Subspace

Bu Yuncheng^{1,2,3
,},
Wang Yu^{1,2,3
,},
Zhang Fubo^{1,2
,},
Ji Guangyu^{1,2,3
,},
Chen Longyong^{1,2,3
,},
Liang Xingdong^{1,2,3
, ,}

①.
Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
②.
National Key Laboratory of Science and Technology on Microwave Imaging, Beijing 100190, China
③.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds: The National Ministries Foundation

摘要

摘要: 阵列干涉合成孔径雷达(Synthetic Aperture Radar, SAR)系统采用距离脉冲压缩、方位合成孔径和高度实孔径的方式，能够获得观测场景的3维SAR图像。在实际系统中多个通道的天线相位中心位置信息通常难以精确获得，如果不进行定标而直接进行成像处理将会造成高度维成像质量降低。针对天线相位中心位置定标问题，该文分析了天线相位中心位置误差对高度维成像造成的影响，提出了一种基于子空间正交原理的相位中心位置定标方法。该方法利用2维SAR单视复图像中的定标点数据，通过特征值分解得到噪声子空间，利用子空间正交原理同时求解多个通道对应的天线相位中心位置。针对阵列干涉SAR系统应用，该文给出了相位中心位置定标处理流程，最后通过仿真和实际数据处理验证了定标方法的有效性。
- 3维成像 /
- 定标 /
- 阵列干涉SAR系统 /
- 相位中心位置 /
- 子空间正交
Abstract: The array InSAR system obtains a three-dimensional image of an observed scene using a combination of pulse compression and synthetic and real aperture techniques. However, Antenna Phase Center (APC) errors can occur within a practical array InSAR system, which thus degrades the imaging quality in a height direction. The aim of this paper is to improve calibration problems occurring with APC errors. The effect of APC errors is analyzed, and a calibration method based on the orthogonal subspace principle is proposed that utilizes SAR Single Look Complex (SLC) to obtain the noise subspace through eigenvalue decomposition. The subspace orthogonal principle is then used to solve the APC positions of multiple channels simultaneously. In addition, a calibration scheme for the APC position is presented for application with an array InSAR system. The effectiveness of the proposed calibration method is verified using simulations and experimental results.
- 3D imaging /
- Calibration /
- Array Interference Synthetic Aperture Radar (InSAR) system /
- Antenna Phase Center (APC) /
- Orthogonal subspace

HTML全文

图 1 阵列干涉SAR系统数据获取示意

Figure 1. Acquisition geometry of array 3D imaging SAR system

下载: 全尺寸图片幻灯片

图 2 正侧视零多普勒平面几何关系示意

Figure 2. Geometry in the zero Doppler plane

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图 3 相位中心位置定标流程图

Figure 3. Flow chart of APC calibration

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图 4 仿真数据的相位中心位置定标结果

Figure 4. Calibration results of APC position in simulation

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图 5 RMSE与信噪比的关系

Figure 5. RMSE as a function of SNR

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图 6 RMSE与定标点误差的关系

Figure 6. RMSE as a function of CR errors

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图 7 代价函数与迭代次数的关系

Figure 7. Cost function as a function of the number of iterations

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图 8 实验系统及定标场图像

Figure 8. The experiment system and calibration site

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图 9 实际数据相位中心位置定标结果

Figure 9. Calibration results of APC position in an airborne experiment

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图 10 实际数据验证实验

Figure 10. Real data experiments

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表 1 仿真实验中的系统参数

Table 1. System parameters of simulation data

参数名称	参数取值
工作频率	15 GHz (Ku-Band)
基线长度	4.2 m
带宽	500 MHz
PRF	2000 Hz
飞行相对高度	1000 m
飞行速度	60 m/s
方位向波束宽度	2°
距离向波束宽度	30°～60°
信噪比	30 dB

下载: 导出CSV

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