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Sensors 2015, 15(11), 27525-27542; doi:10.3390/s151127525

Improving Ambiguity Resolution for Medium Baselines Using Combined GPS and BDS Dual/Triple-Frequency Observations

1
School of Transportation, Southeast University, Nanjing 210096, China
2
School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Assefa M. Melesse
Received: 2 September 2015 / Revised: 15 October 2015 / Accepted: 21 October 2015 / Published: 30 October 2015
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [1064 KB, uploaded 30 October 2015]   |  

Abstract

The regional constellation of the BeiDou navigation satellite system (BDS) has been providing continuous positioning, navigation and timing services since 27 December 2012, covering China and the surrounding area. Real-time kinematic (RTK) positioning with combined BDS and GPS observations is feasible. Besides, all satellites of BDS can transmit triple-frequency signals. Using the advantages of multi-pseudorange and carrier observations from multi-systems and multi-frequencies is expected to be of much benefit for ambiguity resolution (AR). We propose an integrated AR strategy for medium baselines by using the combined GPS and BDS dual/triple-frequency observations. In the method, firstly the extra-wide-lane (EWL) ambiguities of triple-frequency system, i.e., BDS, are determined first. Then the dual-frequency WL ambiguities of BDS and GPS were resolved with the geometry-based model by using the BDS ambiguity-fixed EWL observations. After that, basic (i.e., L1/L2 or B1/B2) ambiguities of BDS and GPS are estimated together with the so-called ionosphere-constrained model, where the ambiguity-fixed WL observations are added to enhance the model strength. During both of the WL and basic AR, a partial ambiguity fixing (PAF) strategy is adopted to weaken the negative influence of new-rising or low-elevation satellites. Experiments were conducted and presented, in which the GPS/BDS dual/triple-frequency data were collected in Nanjing and Zhengzhou of China, with the baseline distance varying from about 28.6 to 51.9 km. The results indicate that, compared to the single triple-frequency BDS system, the combined system can significantly enhance the AR model strength, and thus improve AR performance for medium baselines with a 75.7% reduction of initialization time on average. Besides, more accurate and stable positioning results can also be derived by using the combined GPS/BDS system. View Full-Text
Keywords: GPS/BDS; ambiguity resolution; partial ambiguity fixing; medium baselines; dual/triple-frequency observations GPS/BDS; ambiguity resolution; partial ambiguity fixing; medium baselines; dual/triple-frequency observations
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Gao, W.; Gao, C.; Pan, S.; Wang, D.; Deng, J. Improving Ambiguity Resolution for Medium Baselines Using Combined GPS and BDS Dual/Triple-Frequency Observations. Sensors 2015, 15, 27525-27542.

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