Space-Borne GNSS-R Ionospheric Delay Error Elimination by Optimal Spatial Filtering
1
School of Instrumentation and Opto-Electronic Engineering, Beihang University, Beijing 100191, China
2
National Space Science Center, Chinese Academy of Science, Beijing 1001901, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(19), 5535; https://doi.org/10.3390/s20195535
Received: 30 July 2020
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Revised: 23 September 2020
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Accepted: 25 September 2020
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Published: 27 September 2020
(This article belongs to the Section Remote Sensors)
Global Navigation Satellite System Reflectometry (GNSS-R) technology is a new and promising remote sensing technology, especially satellite-based GNSS-R remote sensing, which has broad application prospects. In this work, the ionospheric impacts on space-borne GNSS-R sea surface altimetry were investigated. An analysis of optimal values for spatial filtering to remove ionospheric delays in space-borne GNSS-R altimetry was conducted. Considering that there are few satellite-borne GNSS-R orbit observations to date, simulated high-resolution space-borne GNSS-R orbital data were used for a comprehensive global and applicable study. The curves of absolute bias in relation to the bilateral filtering points were verified to achieve the minimum absolute bias. The optimal filtering points were evaluated in both statistical probability density and quantile analysis to show the reliability of the selected values. The proposed studies are helpful and valuable for the future implementation of high-accuracy space-borne GNSS-R sea surface altimetry.
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Keywords:
space-borne GNSS-R; sea surface altimetry; ionospheric delay; spatial filtering; reflectometry
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MDPI and ACS Style
Zhang, Q.; Liu, Y.; Xia, J. Space-Borne GNSS-R Ionospheric Delay Error Elimination by Optimal Spatial Filtering. Sensors 2020, 20, 5535. https://doi.org/10.3390/s20195535
AMA Style
Zhang Q, Liu Y, Xia J. Space-Borne GNSS-R Ionospheric Delay Error Elimination by Optimal Spatial Filtering. Sensors. 2020; 20(19):5535. https://doi.org/10.3390/s20195535
Chicago/Turabian StyleZhang, Qiuyang, Yang Liu, and Junming Xia. 2020. "Space-Borne GNSS-R Ionospheric Delay Error Elimination by Optimal Spatial Filtering" Sensors 20, no. 19: 5535. https://doi.org/10.3390/s20195535
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