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Remote Sensing Technology and Application
    
Improve the Height Measurement Accuracy in Three-dimensional Imaging Altimeter Using Nadir Interferometric Phase
Miao Xiangying,Miao Hongli,Zhang Xudong,Huang Xiafeng,Wang Guizhong
(College of Information Science and Engineering,Ocean University of China,Qingdao 266100,China)
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Abstract  Roll angle is an important parameter for three\|dimensional imaging altimeter to measure Sea Surface Height.The height error due to the roll angle error grows linearly across the swath and a slight error of roll angle will results in a large height error within observation range.So a very accurate knowledge of the roll angle error is required.Nadir interferometric phase has a strong correlation with the roll angle,so using the nadir interferometric phase from the interference image can get roll angle more accurately than instrument measurements.It’s possible to meet the centimeter\|level accuracy after correcting the roll angle error.Simulation measurement and elevation reconstruction based on the geometric relationship were performed,and the research of correction the roll angle error by nadir interferometric phase was carried out.Both theoretical calculation and numerical simulation show that the measurement accuracy of roll angle can be as high as 0.03 arcsecond when the accuracy of nadir interferometric phase is 10-3rad.In this case,the height measurement accuracy have been averaged across a swath between 10 and 60 km of nadir will decrease to 0.48 cm which is 6.02 cm when the roll accuracy is 0.36 arcsecond.It means that the nadir interferometric phase method can effectively correct the roll error of three\|dimensional imaging altimeter.
Key words:  Three-dimensional imaging altimeter      Roll angle      Nadir interferometric phase      Height measurement accuracy     
Received:  21 November 2017     
TP 79  
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Miao Xiangying
Miao Hongli
Zhang Xudong
Huang Xiafeng
Wang Guizhong

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Miao Xiangying,Miao Hongli,Zhang Xudong,Huang Xiafeng,Wang Guizhong. Improve the Height Measurement Accuracy in Three-dimensional Imaging Altimeter Using Nadir Interferometric Phase. Remote Sensing Technology and Application, 2018, 33(5): 866-872.

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http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2018.5.0866     OR     http://www.rsta.ac.cn/EN/Y2018/V33/I5/866

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