衛(wèi)星姿態(tài)對(duì)星載SAR成象的影響
EFFECT OF SATELLITE ATTITUDE PARAMETERS ON SAR IMAGING PROCESSING
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摘要: 本文從衛(wèi)星與地面目標(biāo)之間的空間幾何關(guān)系出發(fā)推導(dǎo)了多普勒參數(shù)(多普勒中心頻率和多普勒調(diào)頻率)與衛(wèi)星軌道參數(shù)和姿態(tài)參數(shù)的關(guān)系式,并與從雷達(dá)信號(hào)中提取的參數(shù)值進(jìn)行了比較;分析了各參數(shù)誤差的靈敏度;提出了衛(wèi)星姿態(tài)角誤差分配原理。最后分析了由已知的多普勒中心頻率反算姿態(tài)參數(shù)的可行性。
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關(guān)鍵詞:
- 星載SAR; 參數(shù)估計(jì); 衛(wèi)星姿態(tài)
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]黃順吉等,星載SAR與平臺(tái)擾動(dòng)研究,第三章,電子科技大學(xué)出版社,成都,1990年,第11頁.[4]彭海良,胡東輝,星載SAR成象與衛(wèi)星姿態(tài)參數(shù)的關(guān)系,中國科學(xué)院電子學(xué)研究所,科學(xué)技術(shù)報(bào)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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