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Alternative TitleInversion of the Baseline Incline Angle for Tiangong-2 Interferometric Imaging Radar Altimeter
孙馨怡; 张云华; 董晓; 翟文帅
Source Publication遥感技术与应用
Keyword天宫二号干涉成像雷达高度计 星下点回波 干涉相位 基线倾角
Other AbstractTiangong-2Interferometric Imaging Radar Altimeter(InIRA)is the first wide-swath radar altimeter adopting small incidences angles with short baseline.The knowledge of the roll angle of the baseline is crucial for measuring the wide-swath Sea Surface Height(SSH)with centimeter-level accuracy.In this work,we aim to validate the technique of baseline angle determination from spaceborne nadir interferometric echoes which has been tested by airborne experiment.According to the observation geometry,the interferometric phases of nadir echoes acquired by Tiangong-2Imaging Radar Altimeter(InIRA)are related to the roll angle of the baseline,so it should be possible for us to retrieve the incline angle from the interferometric phases under some ocean conditions not so high.In order to do so,the Tiangong-2 was tilted about 5° so as to realize a 0°baseline and in this way,a lot of data was collected.In this paper,we present the retrieved roll angles and compare them with the measured angles by the platform.Due to the Earth is an ellipsoid, and the control of the Tiangong-2 is referring to the Earth center,while the retrieved roll angle is referring to the nadir point on the Earth surface,there is a systematic error related to the orbit,and after calibration of which,the expected results are obtained:two measurements agree with each other very well not only for the measured trend but also for the standard bias between them.
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孙馨怡,张云华,董晓,等. 天宫二号干涉成像雷达高度计的基线倾角反演[J]. 遥感技术与应用,2019,34(2):331-336.
APA 孙馨怡,张云华,董晓,&翟文帅.(2019).天宫二号干涉成像雷达高度计的基线倾角反演.遥感技术与应用,34(2),331-336.
MLA 孙馨怡,et al."天宫二号干涉成像雷达高度计的基线倾角反演".遥感技术与应用 34.2(2019):331-336.
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