Analysis and Mitigation of Crosstalk Effect on Coastal GNSS-R Code-Level Altimetry Using L5 Signals from QZSS GEO

Coastal Global Navigation Satellite System Reflectometry (GNSS-R) can be used as a valuable supplement for conventional tide gauges, which can be applied for marine environment monitoring and disaster warning. Incidentally, an important problem in dual-antenna GNSS-R altimetry is the crosstalk effec...

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Autores principales:	Yunqiao He, Tianhe Xu, Fan Gao, Nazi Wang, Xinyue Meng, Baojiao Ning
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	altimetry crosstalk effect GNSS-R GEO L5 Science Q
Acceso en línea:	https://doaj.org/article/6a061c589c694ddab3639b71831e7edc
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spelling	oai:doaj.org-article:6a061c589c694ddab3639b71831e7edc2021-11-25T18:54:11ZAnalysis and Mitigation of Crosstalk Effect on Coastal GNSS-R Code-Level Altimetry Using L5 Signals from QZSS GEO10.3390/rs132245532072-4292https://doaj.org/article/6a061c589c694ddab3639b71831e7edc2021-11-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/22/4553https://doaj.org/toc/2072-4292Coastal Global Navigation Satellite System Reflectometry (GNSS-R) can be used as a valuable supplement for conventional tide gauges, which can be applied for marine environment monitoring and disaster warning. Incidentally, an important problem in dual-antenna GNSS-R altimetry is the crosstalk effect, which means that the direct signal leaks into the down-looking antenna dedicated to the reflected signals. When the path delay between the direct and reflected signals is less than one chip length, the delay waveform of the reflected signal is distorted, and the code-level altimetry precision decreases consequently. To solve this problem, the author deduced the influence of signal crosstalk on the reflected signal structure as the same as the multipath effect. Then, a simulation and a coastal experiment are performed to analyze the crosstalk effect on code delay measurements. The L5 signal transmitted by the Quasi-Zenith Satellite System (QZSS) from a geosynchronous equatorial orbit (GEO) satellite is used to avoid the signal power variations with the elevation, so that high-precision GNSS-R code altimetry measurements are achieved in the experiment. Theoretically and experimentally, we found there exists a bias in proportion to the power of the crosstalk signals and a high-frequency term related to the phase delay between the direct and reflected signals. After weakening the crosstalk by correcting the delay waveform, the results show that the RMSE between 23-h sea level height (SSH) measurements and the in-situ observations is about 9.5 cm.Yunqiao HeTianhe XuFan GaoNazi WangXinyue MengBaojiao NingMDPI AGarticlealtimetrycrosstalk effectGNSS-RGEOL5ScienceQENRemote Sensing, Vol 13, Iss 4553, p 4553 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	altimetry crosstalk effect GNSS-R GEO L5 Science Q
spellingShingle	altimetry crosstalk effect GNSS-R GEO L5 Science Q Yunqiao He Tianhe Xu Fan Gao Nazi Wang Xinyue Meng Baojiao Ning Analysis and Mitigation of Crosstalk Effect on Coastal GNSS-R Code-Level Altimetry Using L5 Signals from QZSS GEO
description	Coastal Global Navigation Satellite System Reflectometry (GNSS-R) can be used as a valuable supplement for conventional tide gauges, which can be applied for marine environment monitoring and disaster warning. Incidentally, an important problem in dual-antenna GNSS-R altimetry is the crosstalk effect, which means that the direct signal leaks into the down-looking antenna dedicated to the reflected signals. When the path delay between the direct and reflected signals is less than one chip length, the delay waveform of the reflected signal is distorted, and the code-level altimetry precision decreases consequently. To solve this problem, the author deduced the influence of signal crosstalk on the reflected signal structure as the same as the multipath effect. Then, a simulation and a coastal experiment are performed to analyze the crosstalk effect on code delay measurements. The L5 signal transmitted by the Quasi-Zenith Satellite System (QZSS) from a geosynchronous equatorial orbit (GEO) satellite is used to avoid the signal power variations with the elevation, so that high-precision GNSS-R code altimetry measurements are achieved in the experiment. Theoretically and experimentally, we found there exists a bias in proportion to the power of the crosstalk signals and a high-frequency term related to the phase delay between the direct and reflected signals. After weakening the crosstalk by correcting the delay waveform, the results show that the RMSE between 23-h sea level height (SSH) measurements and the in-situ observations is about 9.5 cm.
format	article
author	Yunqiao He Tianhe Xu Fan Gao Nazi Wang Xinyue Meng Baojiao Ning
author_facet	Yunqiao He Tianhe Xu Fan Gao Nazi Wang Xinyue Meng Baojiao Ning
author_sort	Yunqiao He
title	Analysis and Mitigation of Crosstalk Effect on Coastal GNSS-R Code-Level Altimetry Using L5 Signals from QZSS GEO
title_short	Analysis and Mitigation of Crosstalk Effect on Coastal GNSS-R Code-Level Altimetry Using L5 Signals from QZSS GEO
title_full	Analysis and Mitigation of Crosstalk Effect on Coastal GNSS-R Code-Level Altimetry Using L5 Signals from QZSS GEO
title_fullStr	Analysis and Mitigation of Crosstalk Effect on Coastal GNSS-R Code-Level Altimetry Using L5 Signals from QZSS GEO
title_full_unstemmed	Analysis and Mitigation of Crosstalk Effect on Coastal GNSS-R Code-Level Altimetry Using L5 Signals from QZSS GEO
title_sort	analysis and mitigation of crosstalk effect on coastal gnss-r code-level altimetry using l5 signals from qzss geo
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/6a061c589c694ddab3639b71831e7edc
work_keys_str_mv	AT yunqiaohe analysisandmitigationofcrosstalkeffectoncoastalgnssrcodelevelaltimetryusingl5signalsfromqzssgeo AT tianhexu analysisandmitigationofcrosstalkeffectoncoastalgnssrcodelevelaltimetryusingl5signalsfromqzssgeo AT fangao analysisandmitigationofcrosstalkeffectoncoastalgnssrcodelevelaltimetryusingl5signalsfromqzssgeo AT naziwang analysisandmitigationofcrosstalkeffectoncoastalgnssrcodelevelaltimetryusingl5signalsfromqzssgeo AT xinyuemeng analysisandmitigationofcrosstalkeffectoncoastalgnssrcodelevelaltimetryusingl5signalsfromqzssgeo AT baojiaoning analysisandmitigationofcrosstalkeffectoncoastalgnssrcodelevelaltimetryusingl5signalsfromqzssgeo
_version_	1718410592762462208

Analysis and Mitigation of Crosstalk Effect on Coastal GNSS-R Code-Level Altimetry Using L5 Signals from QZSS GEO

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