卫星姿态对星载SAR成象的影响
EFFECT OF SATELLITE ATTITUDE PARAMETERS ON SAR IMAGING PROCESSING
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摘要: 本文从卫星与地面目标之间的空间几何关系出发推导了多普勒参数(多普勒中心频率和多普勒调频率)与卫星轨道参数和姿态参数的关系式,并与从雷达信号中提取的参数值进行了比较;分析了各参数误差的灵敏度;提出了卫星姿态角误差分配原理。最后分析了由已知的多普勒中心频率反算姿态参数的可行性。
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关键词:
- 星载SAR; 参数估计; 卫星姿态
Abstract: The formulation of Doppler parameters (Doppler centroid and Doppler frequency rate) from the geometry of satellite-borne SAR is derived. After analysing the error sensitivity of SAR orbit and attitude parameters, the error allocation principle for satellite attitude parameters is presented. Finally, the feasibility to calculate the satellite attitude from the Doppler centroid extracted from SAR raw data is proved. -
B. C. Barber, Theory of Digital Imaging from Orbital Synthetic Aperture Radar, Nov.1983,[2]AD-A141152, RAE Technical Report, 83079.[3]黄顺吉等,星载SAR与平台扰动研究,第三章,电子科技大学出版社,成都,1990年,第11页.[4]彭海良,胡东辉,星载SAR成象与卫星姿态参数的关系,中国科学院电子学研究所,科学技术报告,1992年,12月.[5]F. K. Li, D, N. Heid, J. C. Curlander, C. Wu, IEEE Trans. on GE, GE-23(1985)1,47-56.[6]Philippe Oliver, Analytical Formulation of the Doppler Parameters for Spaceborne SAR Processing, IGARSS92, Houston, pp. 1051-1054.[7]C. Wu, J. C. Curlander, A. DiCenzo, Determination of Spacecraft Attitude Using Synthetic Aperture Radar Data, AIAA Sensor Systems for the 80s Conf., California. Dec. 1980, pp. 56-60. -
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