基于惯导系统的机载SAR运动补偿精度分析
Error analysis of airborne SAR motion compensation using INS
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摘要: 该文分析了典型飞机惯性导航系统(INS)的误差特性及其对机载合成孔径雷达(SAR)运动补偿精度和高分辨率成像的影响。分析结果表明INS定位漂移误差是低频误差,并随时间呈级数增加。初始阶段INS漂移误差较小,与杂波锁定和自聚焦方法相结合,可以实现机载SAR高分辨率成像。
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关键词:
- 合成孔径雷达; 运动补偿; 惯性导航系统
Abstract: The motion compensation errors of the airborne Synthetic Aperture Radar (SAR,) using the typical aircraft Inertial Navigation System (INS) are analyzed. It is conduded that the navigation errors of INS are of low frequency and divergent. The INS errors cari be kept in a relativelv small.range at.the beginning stage. Therefore, the high resolution SAR, imaging can be achieved by combining INS with clutterlock and autofocus mothods. -
S. Buckreuss.[J].Motion compensation for airborne SAR based on inertial data, RDM and GPS.Proc. on IGARSS94, USA.1994,:-[2]李立伟,高分辨率机载合成孔径雷达中运动补偿问题的研究,[博士论文],北京,北京航空航天大学,1998年10月[3]J. Moreira, A new method of aircraft motion error extraction from radar raw data for real time motion compensation, IEEE Trans. on Geoscience and Remote Sensing, 1990, GRS-26(4), 620626.[4]T. M. Callway, et al., Subaperture autofocus for synthetic aperture radar, IEEE Trans. on Aerospace and Electronic Systems, 1994, AES-30(2), 617-621.[5]D.E. Wahl, et al., Phase gradient autofocus-A robust tool for high resolution SAR phase orrection, IEEE Trans. on Aerospace and Electronic Systems, 1994, AES-30(3), 827-835.[6]以光衢,陀螺理论与应用,北京,北京航空航天大学出版社,1990年11月,第8章.[7]于波,陈云相,郭秀中,惯性技术,北京,北京航空航天大学出版社,1994年8月,第2,3,5章. -
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