GNSS-IR model of snow depth estimation combining wavelet transform with sliding window
Currently, GNSS interferometric reflectometry technology has become a high-precision method for monitoring land surface snow depth. Aiming at the problems of signal separation and random estimation biases, we developed a GNSS-IR refined model with multi-satellite fusion for snow depth estimation com...
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Surveying and Mapping Press
2020-09-01
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doaj-85dd8fd70562441fb4eaf8c864859ea12021-08-18T02:32:04ZzhoSurveying and Mapping PressActa Geodaetica et Cartographica Sinica1001-15951001-15952020-09-014991179118810.11947/j.AGCS.2020.2020026820200911GNSS-IR model of snow depth estimation combining wavelet transform with sliding windowBIAN Shaofeng0ZHOU Wei1LIU Lilong2LI Houpu3LIU Bei4Department of Navigation Engineering, Naval University of Engineering, Wuhan 430079, ChinaDepartment of Navigation Engineering, Naval University of Engineering, Wuhan 430079, ChinaCollege of Geomatics and Geoinformation, Guilin University of Technology, Guilin 541004, ChinaDepartment of Navigation Engineering, Naval University of Engineering, Wuhan 430079, ChinaDepartment of Navigation Engineering, Naval University of Engineering, Wuhan 430079, ChinaCurrently, GNSS interferometric reflectometry technology has become a high-precision method for monitoring land surface snow depth. Aiming at the problems of signal separation and random estimation biases, we developed a GNSS-IR refined model with multi-satellite fusion for snow depth estimation combining wavelet transform with sliding window. The common polynomial method was replaced by discrete wavelet transform to obtain the high-quality SNR sequences of the reflected signals which can calculate the reflected height of GPS antenna. Then, these reflected heights from SNR observations of multi-satellite were effectively selected and averaged using the sliding window under a constrained threshold. The refined model was established using GNSS observations for snow season from 2016 to 2017, and then the snow depth datasets of both PBO H<sub>2</sub>O and SNOTEL were regarded as reference to verify the performance of the refined model. The results show that there is a high agreement between snow depths derived from the refined model and in situ measurements, and the RMSE is 10 cm. Compared with the results of a single satellite, the accuracy and the stability of the refined model with multi-satellite fusion are obviously better. In terms of RMSE, the accuracy of the refined model has been improved by 50% when compared with PBO H<sub>2</sub>O dataset. In addition, taking into consideration that land surface roughness is an error factor, a relative RMSE value of snow depth estimations corrected by a new datum of the reflection height is approximately 4 cm, and the correlation coefficient between snow depth estimations and in situ measurements reaches 0.98.http://xb.sinomaps.com/article/2020/1001-1595/2020-9-1179.htmglobal navigation satellite system interferometric reflectometrywavelet transformsliding windowsnow depth estimationland surface roughness |
collection |
DOAJ |
language |
zho |
format |
Article |
sources |
DOAJ |
author |
BIAN Shaofeng ZHOU Wei LIU Lilong LI Houpu LIU Bei |
spellingShingle |
BIAN Shaofeng ZHOU Wei LIU Lilong LI Houpu LIU Bei GNSS-IR model of snow depth estimation combining wavelet transform with sliding window Acta Geodaetica et Cartographica Sinica global navigation satellite system interferometric reflectometry wavelet transform sliding window snow depth estimation land surface roughness |
author_facet |
BIAN Shaofeng ZHOU Wei LIU Lilong LI Houpu LIU Bei |
author_sort |
BIAN Shaofeng |
title |
GNSS-IR model of snow depth estimation combining wavelet transform with sliding window |
title_short |
GNSS-IR model of snow depth estimation combining wavelet transform with sliding window |
title_full |
GNSS-IR model of snow depth estimation combining wavelet transform with sliding window |
title_fullStr |
GNSS-IR model of snow depth estimation combining wavelet transform with sliding window |
title_full_unstemmed |
GNSS-IR model of snow depth estimation combining wavelet transform with sliding window |
title_sort |
gnss-ir model of snow depth estimation combining wavelet transform with sliding window |
publisher |
Surveying and Mapping Press |
series |
Acta Geodaetica et Cartographica Sinica |
issn |
1001-1595 1001-1595 |
publishDate |
2020-09-01 |
description |
Currently, GNSS interferometric reflectometry technology has become a high-precision method for monitoring land surface snow depth. Aiming at the problems of signal separation and random estimation biases, we developed a GNSS-IR refined model with multi-satellite fusion for snow depth estimation combining wavelet transform with sliding window. The common polynomial method was replaced by discrete wavelet transform to obtain the high-quality SNR sequences of the reflected signals which can calculate the reflected height of GPS antenna. Then, these reflected heights from SNR observations of multi-satellite were effectively selected and averaged using the sliding window under a constrained threshold. The refined model was established using GNSS observations for snow season from 2016 to 2017, and then the snow depth datasets of both PBO H<sub>2</sub>O and SNOTEL were regarded as reference to verify the performance of the refined model. The results show that there is a high agreement between snow depths derived from the refined model and in situ measurements, and the RMSE is 10 cm. Compared with the results of a single satellite, the accuracy and the stability of the refined model with multi-satellite fusion are obviously better. In terms of RMSE, the accuracy of the refined model has been improved by 50% when compared with PBO H<sub>2</sub>O dataset. In addition, taking into consideration that land surface roughness is an error factor, a relative RMSE value of snow depth estimations corrected by a new datum of the reflection height is approximately 4 cm, and the correlation coefficient between snow depth estimations and in situ measurements reaches 0.98. |
topic |
global navigation satellite system interferometric reflectometry wavelet transform sliding window snow depth estimation land surface roughness |
url |
http://xb.sinomaps.com/article/2020/1001-1595/2020-9-1179.htm |
work_keys_str_mv |
AT bianshaofeng gnssirmodelofsnowdepthestimationcombiningwavelettransformwithslidingwindow AT zhouwei gnssirmodelofsnowdepthestimationcombiningwavelettransformwithslidingwindow AT liulilong gnssirmodelofsnowdepthestimationcombiningwavelettransformwithslidingwindow AT lihoupu gnssirmodelofsnowdepthestimationcombiningwavelettransformwithslidingwindow AT liubei gnssirmodelofsnowdepthestimationcombiningwavelettransformwithslidingwindow |
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1721204102007881728 |