A Channel Phase Error Compensation Method for Space Borne Array SAR Based on Antenna Pattern and Doppler Correlation Coefficient
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摘要: 随着对地观测技术的发展，要求SAR系统能够同时实现高分辨率和宽测绘带，天基阵列多通道SAR结合数字波束形成(DBF)技术为解决该问题提供了很好的思路，但各个通道之间相位误差会很大程度上降低DBF的性能，常规通道误差补偿方法估计精度不足，应用场景受限。针对上述问题，该文提出一种基于方向图和多普勒相关系数的天基阵列SAR通道相位误差补偿方法，不仅利用天线方向图先验信息，还充分利用场景不同多普勒相关性信息，通过最小化天线方向图和多普勒的组合差异，实现对通道之间相位误差的估计。结合RADAR-SAT数据的仿真试验结果验证了该算法的有效性。Abstract: With the development of earth remote sensing technology, SAR system is required to obtain high resolution and wide swath simultaneously, the space borne array SAR combined with Digital Beam Forming (DBF) technology provides a good solution to solve the problem. However, the phase error between channels will degrade the quality of DBF, and the traditional compensation methods suffer from large error or limite application. In this paper, a compensation method based on antenna pattern and Doppler correlation coefficient is proposed, using the antenna pattern and meanwhile utilizing the Doppler correlation coefficient. By minimizing the combined cost function, the phase error between channels are estimated. Simulation results using RADAR-SAT data validate the effectiveness of the proposed method.
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Key words:
- SAR /
- Multi-channel /
- Channel phase error /
- Antenna pattern /
- Doppler correlation coefficient
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表 2 实际系统的主要参数
参数 数值 工作频率(GHz) 5.3 带宽(MHz) 30 采样率(MHz) 32.3 PRF(Hz) 1256.98 速度(m/s) 7062 通道数 3 相邻通道间的距离(m) 1.9 
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叶恺, 禹卫东, 徐伟, 等. 基于柱形抛物面天线的MIMO SAR研究[J]. 电子与信息学报, 2018, 40(8): 1816–1822. doi: 10.11999/JEIT171105YE Kai, YU Weidong, XU Wei, et al. Investigation on parabolic cylinder reflector based MIMO SAR[J]. Journal of Electronics &Information Technology, 2018, 40(8): 1816–1822. doi: 10.11999/JEIT171105 DING Chibiao, LIANG Xingdong, WANG Jie, et al. An novel airborne MIMO-SAR system built in IECAS[C]. 2017 IEEE International Geoscience and Remote Sensing Symposium, Fort Worth, USA, 2017: 2423–2426. 周建卫, 李道京, 田鹤, 等. 基于共形稀疏阵列的艇载外辐射源雷达性能分析[J]. 电子与信息学报, 2017, 39(5): 1058–1063. doi: 10.11999/JEIT160846ZHOU Jianwei, LI Daojing, TIAN He, et al. Performance analysis on airship-borne passive radar based on conformal sparse array[J]. Journal of Electronics &Information Technology, 2017, 39(5): 1058–1063. doi: 10.11999/JEIT160846 QIN Lilong, VOROBYOV S A, and DONG Zhen. Joint cancelation of autocorrelation sidelobe and cross correlation in MIMO-SAR[J]. IEEE Geoscience and Remote Sensing Letters, 2017, 14(6): 931–935. doi: 10.1109/LGRS.2017.2688122 TRIDON D B, BACHMANN M, DE ZAN F, et al. Tandem-L observation concept - contributions and challenges of systematic monitoring of earth system dynamics[C]. Proceedings of the 18th International Radar Symposium, Prague, Czech Republic, 2017: 1–9. MA L, LI Z F, and LIAO G L. System error analysis and calibration methods for multi-channel SAR[J]. Progress in Electromagnetics Research, 2011, 112: 309–327. doi: 10.2528/PIER10120808 LIU Yanyang, CUI Lei, XU Youshuan, et al. A novel signal-cancellation-based channel phase bias calibration algorithm for spaceborne multi-channel HR WS SAR in azimuth[C]. 2015 IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar, Singapore, 2015: 494–497. LI Zhenfang, BAO Zheng, WANG Hongyang, et al. Performance improvement for constellation SAR using signal processing techniques[J]. IEEE Transactions on Aerospace and Electronic Systems, 2006, 42(2): 436–452. doi: 10.1109/TAES.2006.1642562 LIU Aifei, LIAO Guisheng, XU Qing, et al. An improved array-error estimation method for constellation SAR systems[J]. IEEE Geoscience and Remote Sensing Letters, 2012, 9(1): 90–94. doi: 10.1109/LGRS.2011.2161262 YANG Taoli, LI Zhenfang, LIU Yanyang, et al. Channel error estimation methods for multichannel SAR systems in azimuth[J]. IEEE Geoscience and Remote Sensing Letters, 2013, 10(3): 548–552. doi: 10.1109/LGRS.2012.2212873 杨桃丽, 李真芳, 刘艳阳, 等. 两种星载高分辨宽测绘带SAR系统通道相位误差估计方法[J]. 电子学报, 2013, 41(5): 931–935. doi: 10.3969/j.issn.0372-2112.2013.05.016YANG Taoli, LI Zhenfang, LIU Yanyang, et al. Two channel phase error estimation methods for spaceborne HRWS SAR system[J]. Acta Electronica Sinica, 2013, 41(5): 931–935. doi: 10.3969/j.issn.0372-2112.2013.05.016 张福博, 刘梅. 基于频域最小二乘APES的非均匀多基线SAR层析成像算法[J]. 电子与信息学报, 2012, 34(7): 1568–1573. doi: 10.3724/SP.J.1146.2011.01184ZHANG Fubo and LIU Mei. Uneven multi-baseline SAR tomography base on frequency domain least squares amplitude and phase estimation (APES)[J]. Journal of Electronics &Information Technology, 2012, 34(7): 1568–1573. doi: 10.3724/SP.J.1146.2011.01184 杨桃丽. 星载多通道高分辨宽测绘带合成孔径雷达成像处理技术研究[D]. [博士论文], 西安电子科技大学, 2014: 58–65.YANG Taoli. Study on spaceborne multi-channel high resolution and wide swath SAR imaging[D]. [Ph.D. dissertation], Xidian University, 2014: 58–65. RINCON R, FATOYINBO T, OSMANOGLU B, et al. Development of NASA’S next generation L-band digital beamforming synthetic aperture radar (DBSAR-2)[C]. Proceedings of EUSAR 2016: 11th European Synthetic Aperture Radar Conference 2016, Hamburg, Germany, 2016: 1–4. 范怀涛, 张志敏, 李宁. 基于特征分解的方位向多通道SAR相位失配校正方法[J]. 雷达学报, 2018, 7(3): 346–354. doi: 10.12000/JR17012FAN Huaitao, ZHANG Zhimin, and LI Ning. Channel phase mismatch calibration for multichannel in azimuth SAR imaging based on Eigen-structure method[J]. Journal of Radars, 2018, 7(3): 346–354. doi: 10.12000/JR17012 ZHANG Linjian, GAO Yesheng, and LIU Xingzhao. Fast channel phase error calibration algorithm for azimuth multichannel high-resolution and wide-swath synthetic aperture radar imaging system[J]. Journal of Applied Remote Sensing, 2017, 11(3): 035003. doi: 10.1117/1.JRS.11.035003 -
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