Real-Time Phase Bias Estimation for BeiDou Satellites Based on Consideration of Orbit Errors

Correction of the fractional cycle bias (FCB) in the undifferenced ambiguity allows precise point positioning (PPP) integer ambiguity resolution (IAR) to be achieved, which can improve positioning accuracy significantly. In addition, in real-time PPP-IAR, integration of the BeiDou Navigation Satelli...

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Main Authors: Yanyan Liu, Jiasong Zhu, Shirong Ye, Weiwei Song
Format: Article
Language:English
Published: MDPI AG 2018-06-01
Series:Remote Sensing
Subjects:
GPS
Online Access:http://www.mdpi.com/2072-4292/10/7/1009
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spelling doaj-9f9878b73d8c44c2b436b6a7fce4f6662020-11-24T21:58:34ZengMDPI AGRemote Sensing2072-42922018-06-01107100910.3390/rs10071009rs10071009Real-Time Phase Bias Estimation for BeiDou Satellites Based on Consideration of Orbit ErrorsYanyan Liu0Jiasong Zhu1Shirong Ye2Weiwei Song3Institute of Urban Smart Transportation & Safety Maintenance, College of Civil Engineering, Shenzhen University, Shenzhen 518060, ChinaInstitute of Urban Smart Transportation & Safety Maintenance, College of Civil Engineering, Shenzhen University, Shenzhen 518060, ChinaGNSS Research Center, Wuhan University, Wuhan 430079, ChinaGNSS Research Center, Wuhan University, Wuhan 430079, ChinaCorrection of the fractional cycle bias (FCB) in the undifferenced ambiguity allows precise point positioning (PPP) integer ambiguity resolution (IAR) to be achieved, which can improve positioning accuracy significantly. In addition, in real-time PPP-IAR, integration of the BeiDou Navigation Satellite System (BDS) can provide a significant reduction in the initial fixing time of global positioning system (GPS)-only PPP-IAR. However, the FCB quality can be considerably affected by the low precision of the BDS orbit, which then severely hampers the GPS + BDS PPP-IAR performance. Therefore, a real-time FCB estimation strategy that takes the BDS satellite orbit error into consideration was developed in this study. The slant orbit error can be absorbed by the ionosphere-free (IF) ambiguity, which can then be recovered by fixing all IF ambiguities from all the tracking stations. The estimated orbit error is then used to refine the orbit, which is broadcast along with the FCBs to enable PPP ambiguity resolution. To evaluate the proposed strategy, an experiment using 60 tracking stations covering the China region is performed in a simulated real-time mode. The a posteriori residuals of both the wide- and narrow-lane ambiguities are checked to validate the efficiency of the proposed FCB strategy. The results show that when the proposed strategy is applied, the effect of the BDS orbit error on narrow-lane FCB estimation is eliminated and more than 94% of the narrow-lane residuals are within 0.1 cycles for both the GPS and the BDS. The fixing percentage within 20 min is 46.3% for the GPS-only solution but is only 4.8% when using GPS + BDS with the traditional method. However, when the proposed strategy is used, the fixing percentage for GPS + BDS improves significantly to 91.7%.http://www.mdpi.com/2072-4292/10/7/1009GPSBeiDou Navigation Satellite System (BDS)precise point positioningambiguity resolutionfractional cycle biasorbit error
collection DOAJ
language English
format Article
sources DOAJ
author Yanyan Liu
Jiasong Zhu
Shirong Ye
Weiwei Song
spellingShingle Yanyan Liu
Jiasong Zhu
Shirong Ye
Weiwei Song
Real-Time Phase Bias Estimation for BeiDou Satellites Based on Consideration of Orbit Errors
Remote Sensing
GPS
BeiDou Navigation Satellite System (BDS)
precise point positioning
ambiguity resolution
fractional cycle bias
orbit error
author_facet Yanyan Liu
Jiasong Zhu
Shirong Ye
Weiwei Song
author_sort Yanyan Liu
title Real-Time Phase Bias Estimation for BeiDou Satellites Based on Consideration of Orbit Errors
title_short Real-Time Phase Bias Estimation for BeiDou Satellites Based on Consideration of Orbit Errors
title_full Real-Time Phase Bias Estimation for BeiDou Satellites Based on Consideration of Orbit Errors
title_fullStr Real-Time Phase Bias Estimation for BeiDou Satellites Based on Consideration of Orbit Errors
title_full_unstemmed Real-Time Phase Bias Estimation for BeiDou Satellites Based on Consideration of Orbit Errors
title_sort real-time phase bias estimation for beidou satellites based on consideration of orbit errors
publisher MDPI AG
series Remote Sensing
issn 2072-4292
publishDate 2018-06-01
description Correction of the fractional cycle bias (FCB) in the undifferenced ambiguity allows precise point positioning (PPP) integer ambiguity resolution (IAR) to be achieved, which can improve positioning accuracy significantly. In addition, in real-time PPP-IAR, integration of the BeiDou Navigation Satellite System (BDS) can provide a significant reduction in the initial fixing time of global positioning system (GPS)-only PPP-IAR. However, the FCB quality can be considerably affected by the low precision of the BDS orbit, which then severely hampers the GPS + BDS PPP-IAR performance. Therefore, a real-time FCB estimation strategy that takes the BDS satellite orbit error into consideration was developed in this study. The slant orbit error can be absorbed by the ionosphere-free (IF) ambiguity, which can then be recovered by fixing all IF ambiguities from all the tracking stations. The estimated orbit error is then used to refine the orbit, which is broadcast along with the FCBs to enable PPP ambiguity resolution. To evaluate the proposed strategy, an experiment using 60 tracking stations covering the China region is performed in a simulated real-time mode. The a posteriori residuals of both the wide- and narrow-lane ambiguities are checked to validate the efficiency of the proposed FCB strategy. The results show that when the proposed strategy is applied, the effect of the BDS orbit error on narrow-lane FCB estimation is eliminated and more than 94% of the narrow-lane residuals are within 0.1 cycles for both the GPS and the BDS. The fixing percentage within 20 min is 46.3% for the GPS-only solution but is only 4.8% when using GPS + BDS with the traditional method. However, when the proposed strategy is used, the fixing percentage for GPS + BDS improves significantly to 91.7%.
topic GPS
BeiDou Navigation Satellite System (BDS)
precise point positioning
ambiguity resolution
fractional cycle bias
orbit error
url http://www.mdpi.com/2072-4292/10/7/1009
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