航空学报 > 2001, Vol. 22 Issue (2): 121-124

用于SAR运动补偿的DGPS/SINS组合系统研究

曹福祥1, 保铮1, 袁建平2, 郑谔2   

  1. 1. 西安电子科技大学雷达信号处理重点实验室,陕西西安710071;2. 西北工业大学航天工程学院,陕西西安710072
  • 收稿日期:1999-12-27 修回日期:2000-05-30 出版日期:2001-04-25 发布日期:2001-04-25

DGPS/SINS INTEGRATED SYSTEM USED IN SAR MOTION COMPENSATION

CAO Fu xiang1, BAO Zheng1, YUAN Jian ping2, ZHENG E2   

  1. 1. Key Laboratory for Radar Signal Processing, Xidian University, Xi′an 710071, China;2. College of Astronautics, Northwestern Polytechnical University, Xi′an 710072, China
  • Received:1999-12-27 Revised:2000-05-30 Online:2001-04-25 Published:2001-04-25

摘要:

使用考虑位置误差相关项的伪距率观测模型 ,研究了用于合成孔径雷达运动补偿的差分 GPS/ SINS伪距率组合系统。结果表明 ,组合系统的长期位置精度能达到 1 m左右。 GPS数据更新率低于 INS,在 GPS测量时间间隔内 ,组合系统的性能仅由 INS决定。虽然 INS误差随时间积累 ,在 GPS数据更新率为 1 s的情况下 ,即使采用中等精度的惯性仪表 ,其相对位置精度为厘米级 (这里相对位置精度指组合系统在 GPS测量时间间隔内位置误差的变化范围)。

关键词: 差分GPS, 捷联式惯性导航系统, 卡尔曼滤波, 合成孔径雷达, 运动补偿

Abstract:

Nowadays higher resolution image from an airborne Synthetic Aperture Radar (SAR) is needed in both civil and military usage, so more accurate motion compensation should be applied to the radar returns to reduce image degradation caused by spurious motion of antenna phase center (APC). As Global Positioning System (GPS) became practical usage, the SARMCS using the information of GPS has received increasing attention.

Key words: differential GPS, strapdown INS, Kalman filter, synthetic aperture radar, motion compensation

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