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MOTION COMPENSATION FOR HIGH RESOLUTION AIRBORNE SAR WITH IMU & GPS
作者姓名:李立伟  毛士艺
作者单位:Beijing University of Aeronautics and Astronautics,Beijing,100083,China
摘    要:Theerorbetweenactualandnominalflightpathsoftheantennaphasecenter(APC)isde-finedastheplatformmotioneror.Uncompen-satedAPCmotio...


MOTION COMPENSATION FOR HIGH RESOLUTION AIRBORNE SAR WITH IMU & GPS
Asif Raza,Li Liwei,Mao Shiyi.MOTION COMPENSATION FOR HIGH RESOLUTION AIRBORNE SAR WITH IMU & GPS[J].Chinese Journal of Aeronautics,1999(1).
Authors:Asif Raza  Li Liwei  Mao Shiyi
Abstract:Inertial measurement unit (IMU) is a standard motion sensor in modern airborne SAR systems. But how to remove its systematic error is a difficult problem, which impacts the improvement of resolution in azimuth. The technique of motion compensation presented in this paper, uses the GPS as a reference system to estimate and correct the systematic error of the IMU on the concept of linear unbiased minimum variance (LUMV). This new and effective method achieves very accurate position measurement (both high and low frequency) of the APC in not only short but also long terms, so that it can satisfy the requirement of high resolution airborne SAR. In the last section of the paper, some experimental simulations from raw data are given.
Keywords:motion compensation  inertial measurement unit (IMU)  global positioning system (GPS)  linear unbiased minimum variance (LUMV)  systematic error
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