Performance Analysis on ISAR Imaging of Space Targets
Zhou Yejian①② Zhang Lei①②* Wang Hongxian①② Xing Mengdao①②
①(National Laboratory of Radar Signal Processing, Xidian University, Xi'an 710071, China) ②(Collaborative Innovation Center of Information Sensing and Understanding at Xidian University, Xi'an 710071, China)
Usually, in traditional Inverse Synthetic Aperture Radar (ISAR) systems design and mode selection for space satellite targets, coherent integration gain in azimuth direction hardly can be analyzed, which depends on target's motion. In this study, we combine the target orbit parameters to determine its motion relative to radar and deduce coherent integration equation in ISAR imaging to realize the selection of imaging intervals based on coherent integration, which can ensure the resolution in azimuth direction. Meanwhile, we analyze the influence of target orbit altitude to echo power and imaging Signal-to-Noise Ratio (SNR) that provides a new indicator for space observation ISAR systems design. The result of simulation experiment illustrates that with target orbit altitude increasing, coherent integration gain in azimuth direction of large-angular observation offsets the decreasing of imaging SNR in a degree, which provides a brand-new perspective for space observation ISAR systems and signal processing design.
Xing Mengdao and Bao Zheng. High-resolution ISAR imaging of high speed moving targets[C]. IEE Proceedings-Radar, Sonar and Navigation, 2005, 152(2):58-67.
[2]
Bai Xueru, Xing Mengdao, Zhou Feng, et al.. High-resolution 3D imaging of spinning space debris[J]. IEEE Transactions on Geoscience and Remote Sensing, 2009, 47(7):2352-2362. DOI:10.1109/TGRS.2008.2010854.[DOI:10.1109/TGRS.2008.2010854]
[3]
王琦. 空间目标ISAR成像的研究[D].[博士论文], 西安电子科技大学, 2007. Wang Qi. Study of ISAR imaging for space targets[D].[Ph.D. dissertation], Xidian University, 2007.
[4]
王洋, 金胜, 黄璐. 空间目标双基地雷达ISAR成像技术研究[J]. 雷达科学与技术, 2015, 13(5):485-495. Wang Yang, Jin Sheng, and Huang Lu. Bistatic radar ISAR imaging of space target[J]. Radar Science and Technology, 2015, 13(5):485-495.
[5]
王珊, 季伟, 陈娟, 等. 基于运动目标检测的多脉冲相干积累算法[J]. 机械与电子, 2010, 9:490-491. Wang Shan, Ji Wei, Chen Juan, et al.. Coherent integration algorithm of high velocity moving target[J]. Science and Technology Information, 2010, 9:490-491.
[6]
庞存锁, 张南, 侯慧玲. 高速微弱目标长时间积累对雷达方程的影响[J]. 火控雷达技术, 2015, 44(1):7-9. Pang Cunsuo, Zhang Nan, and Hou Huilin. Radar equation for high-speed weak target during long time integration[J]. Fire Control Radar Technology, 2015, 44(1):7-9.
[7]
李亮, 洪峻, 明峰, 等. 电离层时空变化对中高轨SAR成像质量的影响分析[J]. 电子与信息学报, 2014, 36(4):915-922. DOI:10.3724/SP.J.1146.2013.00859. Li Liang, Hong Jun, Ming Feng, et al.. Study on ionospheric effects induced by spatio-temporal variability on medium-earth-orbit SAR imaging quality[J]. Journal of Electronics & Information Technology, 2014, 36(4):915-922. DOI:10.3724/SP.J.1146.2013.00859.[DOI:10.3724/SP.J.1146.2013.00859]
[8]
黄小红, 文贡坚. L波段雷达电离层高速运动目标ISAR成像补偿方法[J]. 电子与信息学报, 2015, 12(37):2971-2976. DOI:10.999/JEIT150646. Huang Xiaohong and Wen Gongjian. Compensating method of L-band radar ISAR imaging for ionosphereic target with high-velocity[J]. Journal of Electronics & Information Technology, 2015, 12(37):2971-2976. DOI:10.999/JEIT150646.[DOI:10.999/JEIT150646]
范录宏. 逆合成孔径雷达成像与干扰技术研究[D].[博士论文], 电子科技大学, 2006. Fan Luhong. Research on imaging and jamming of inverse synthetic aperture radar[D].[Ph.D. dissertation], University of Electronic Science and Technology of China, 2006.
[11]
许然. 提高雷达成像质量的若干新体制和新方法研究[D].[博士论文], 西安电子科技大学, 2015. Xu Ran. Study on new systems and techniques for improving radar imaging performances[D].[Ph.D. dissertation], Xidian University, 2015.
[12]
Cao X, Su F, Sun H, et al.. Space debris observation via space-based ISAR imaging[C]. International Conference on Microwave and Millimeter Wave Technology, Guilin, China, April 18-21, 2007:1-5.
张云彬, 张永生. 近圆轨道遥感卫星星下点轨迹的计算[J]. 测绘学院学报, 2001, 18(4):257-259. Zhang Yunbin and Zhang Yongsheng. Calculation of sub-satellite track of remote sensing satellite in nearly round orbit[J]. Journal of Institute of Surveying and Mapping, 2001, 18(4):257-259.
[15]
任锴. 导航卫星精密定轨理论与方法研究[D].[博士论文], 信息工程大学, 2015. Ren Kai. Research on theory and methodology of precise orbit determination of navigation satellites[D].[Ph.D. dissertation], PLA Information Engineering University, 2015.
[16]
黄艳, 张永利, 刘志铭. 一种基于点目标的雷达影像质量评价方法[J]. 测绘工程, 2012, 21(1):30-34. Huang Yan, Zhang Yongli, and Liu Zhiming. A method of SAR image quality evaluation based on pinpoint target[J]. Engineering of Surveying and Mapping, 2012, 21(1):30-34.
2017, Vol. 6 
