Method of Phase Filtering for Wide-Swath Interferometric Imaging Radar Altimeter Based on Total Variation

LU Xiang; ZHANG Qingjun; DONG Xiao; LIU Lei

doi:10.11999/JEIT210135

Volume 44 Issue 3

Mar. 2022

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Article Navigation > Journal of Electronics & Information Technology > 2022 > 44(3): 1044-1051

LU Xiang, ZHANG Qingjun, DONG Xiao, LIU Lei. Method of Phase Filtering for Wide-Swath Interferometric Imaging Radar Altimeter Based on Total Variation[J]. Journal of Electronics & Information Technology, 2022, 44(3): 1044-1051. doi: 10.11999/JEIT210135

Citation:

LU Xiang, ZHANG Qingjun, DONG Xiao, LIU Lei. Method of Phase Filtering for Wide-Swath Interferometric Imaging Radar Altimeter Based on Total Variation[J]. Journal of Electronics & Information Technology, 2022, 44(3): 1044-1051. doi: 10.11999/JEIT210135

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Method of Phase Filtering for Wide-Swath Interferometric Imaging Radar Altimeter Based on Total Variation

doi: 10.11999/JEIT210135

1.
Institute of Remote Sensing Satellite, China Academy of Space Technology, Beijing 100094, China
2.
National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China

Funds: The National Natural Science Foundation of China (62031005)

Received Date: 2021-02-07
Rev Recd Date: 2021-06-30

Available Online: 2021-07-05

Publish Date: 2022-03-28

Abstract

Abstract

The wide-swath interferometric imaging radar altimeter with short baseline and at near nadir angles will satisfy the requirement of high precision, high temporal and spatial resolution Sea Surface Height (SSH) for sub-mesoscale ocean features. In the process of retrieving sea level, interferometric phase filtering is an important part of suppressing random phase noise and maintaining the details of phase edges. The varying random noise of flattened phase will be attenuated effectively with total variation regularization filtering which based on the features of noise distribution along the cross-track direction for the altimeter. Simulation results show the STandard Deviation (STD) of the filtered phase error using the proposed method is reduced from 0.32 rad to 0.023 rad, and the maximum deviation is less than 0.001 rad within the swath. The distribution of the phase error accuracy using the proposed method is more homogeneous compared to traditional phase filtering methods. Simulation results also show the proposed method can preserve the resolution and edge information, which provides an effective guarantee for the consistency of sea surface elevation accuracy.
- Interferometric imaging radar altimeter,
- Interferometric phase filtering,
- Total variation regularization

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References(27)

References

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