Inter-System Differencing between GPS and BDS for Medium-Baseline RTK Positioning
An inter-system differencing model between two Global Navigation Satellite Systems (GNSS) enables only one reference satellite for all observations. If the associated differential inter-system biases (DISBs) are priori known, double-differenced (DD) ambiguities between overlapping frequencies from d...
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doaj-7e54c1afd8b24c319deca1180bec201c2020-11-24T22:02:55ZengMDPI AGRemote Sensing2072-42922017-09-019994810.3390/rs9090948rs9090948Inter-System Differencing between GPS and BDS for Medium-Baseline RTK PositioningWang Gao0Chengfa Gao1Shuguo Pan2Xiaolin Meng3Yan Xia4School of Transportation, Southeast University, Nanjing 210096, ChinaSchool of Transportation, Southeast University, Nanjing 210096, ChinaSchool of Instrument Science and Engineering, Southeast University, Nanjing 210096, ChinaNottingham Geospatial Institute, The University of Nottingham, NG7 2TU Nottingham, UKSchool of Instrument Science and Engineering, Southeast University, Nanjing 210096, ChinaAn inter-system differencing model between two Global Navigation Satellite Systems (GNSS) enables only one reference satellite for all observations. If the associated differential inter-system biases (DISBs) are priori known, double-differenced (DD) ambiguities between overlapping frequencies from different GNSS constellations can also be fixed to integers. This can provide more redundancies for the observation model, and thus will be beneficial to ambiguity resolution (AR) and real-time kinematic (RTK) positioning. However, for Global Positioning System (GPS) and the regional BeiDou Navigation Satellite System (BDS-2), there are no overlapping frequencies. Tight combination of GPS and BDS needs to process not only the DISBs but also the single-difference ambiguity of the reference satellite, which is caused by the influence of different frequencies. In this paper, we propose a tightly combined dual-frequency GPS and BDS RTK positioning model for medium baselines with real-time estimation of DISBs. The stability of the pseudorange and phase DISBs is analyzed firstly using several baselines with the same or different receiver types. The dual-frequency ionosphere-free model with parameterization of GPS-BDS DISBs is proposed, where the single-difference ambiguity is estimated jointly with the phase DISB parameter from epoch to epoch. The performance of combined GPS and BDS RTK positioning for medium baselines is evaluated with simulated obstructed environments. Experimental results show that with the inter-system differencing model, the accuracy and reliability of RTK positioning can be effectively improved, especially for the obstructed environments with a small number of satellites available.https://www.mdpi.com/2072-4292/9/9/948GPS and BDSinter-system differencingdifferential inter-system biases (DISBs)real-time kinematic (RTK) positioningmedium baselines |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Wang Gao Chengfa Gao Shuguo Pan Xiaolin Meng Yan Xia |
spellingShingle |
Wang Gao Chengfa Gao Shuguo Pan Xiaolin Meng Yan Xia Inter-System Differencing between GPS and BDS for Medium-Baseline RTK Positioning Remote Sensing GPS and BDS inter-system differencing differential inter-system biases (DISBs) real-time kinematic (RTK) positioning medium baselines |
author_facet |
Wang Gao Chengfa Gao Shuguo Pan Xiaolin Meng Yan Xia |
author_sort |
Wang Gao |
title |
Inter-System Differencing between GPS and BDS for Medium-Baseline RTK Positioning |
title_short |
Inter-System Differencing between GPS and BDS for Medium-Baseline RTK Positioning |
title_full |
Inter-System Differencing between GPS and BDS for Medium-Baseline RTK Positioning |
title_fullStr |
Inter-System Differencing between GPS and BDS for Medium-Baseline RTK Positioning |
title_full_unstemmed |
Inter-System Differencing between GPS and BDS for Medium-Baseline RTK Positioning |
title_sort |
inter-system differencing between gps and bds for medium-baseline rtk positioning |
publisher |
MDPI AG |
series |
Remote Sensing |
issn |
2072-4292 |
publishDate |
2017-09-01 |
description |
An inter-system differencing model between two Global Navigation Satellite Systems (GNSS) enables only one reference satellite for all observations. If the associated differential inter-system biases (DISBs) are priori known, double-differenced (DD) ambiguities between overlapping frequencies from different GNSS constellations can also be fixed to integers. This can provide more redundancies for the observation model, and thus will be beneficial to ambiguity resolution (AR) and real-time kinematic (RTK) positioning. However, for Global Positioning System (GPS) and the regional BeiDou Navigation Satellite System (BDS-2), there are no overlapping frequencies. Tight combination of GPS and BDS needs to process not only the DISBs but also the single-difference ambiguity of the reference satellite, which is caused by the influence of different frequencies. In this paper, we propose a tightly combined dual-frequency GPS and BDS RTK positioning model for medium baselines with real-time estimation of DISBs. The stability of the pseudorange and phase DISBs is analyzed firstly using several baselines with the same or different receiver types. The dual-frequency ionosphere-free model with parameterization of GPS-BDS DISBs is proposed, where the single-difference ambiguity is estimated jointly with the phase DISB parameter from epoch to epoch. The performance of combined GPS and BDS RTK positioning for medium baselines is evaluated with simulated obstructed environments. Experimental results show that with the inter-system differencing model, the accuracy and reliability of RTK positioning can be effectively improved, especially for the obstructed environments with a small number of satellites available. |
topic |
GPS and BDS inter-system differencing differential inter-system biases (DISBs) real-time kinematic (RTK) positioning medium baselines |
url |
https://www.mdpi.com/2072-4292/9/9/948 |
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