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2013•Journal of Navigation and PositioningRequires access

Research on Combined Positioning Accuracy Using Carrier Smoothed Pseudo-range Method

Liu Ju

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Abstract

BeiDou satellite navigation system(BDS)has been providing regional positioning service.In order to study the point positioning accuracy of BDS and combined BDS/GPS,the method of smoothing the code-code ionosphere-free combination of GPS、 BDS and combined GPS/BDS based on Hatch-type filtering using the phase-phase ionosphere-free combination is used,and the positio- ning results are analyzed comparatively.The conclusionis that the positioning error is more stable and the range of the error fluctuation is smaller when using the carrier smoothed pseudo-range.Currently the horizontal precision of BDS is 10m,and the height precision is better than 20m.And the ephemeris precision of BDS is less than that of GPS,so when the visible satellites of GPS are sufficient,the positioning precision is not significantly improved by adding BDS observations.

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What this paper is about

BeiDou satellite navigation system(BDS)has been providing regional positioning service.In order to study the point positioning accuracy of BDS and combined BDS/GPS,the method of smoothing the code-code ionosphere-free combination of GPS、 BDS and combined GPS/BDS based on Hatch-type filtering using the phase-phase ionosphere-free combination is used,and the positio- ning results are analyzed comparatively.The conclusionis that the positioning error is more stable and the range of the error fluctuation is smaller when using the carrier smoothed pseudo-range.Currently the horizontal precision of BDS is 10m,and the height precision is better than 20m.And the ephemeris precision of BDS is less than that of GPS,so when the visible satellites of GPS are sufficient,the positioning precision is not significantly improved by adding BDS observations.

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Available abstract

BeiDou satellite navigation system(BDS)has been providing regional positioning service.In order to study the point positioning accuracy of BDS and combined BDS/GPS,the method of smoothing the code-code ionosphere-free combination of GPS、 BDS and combined GPS/BDS based on Hatch-type filtering using the phase-phase ionosphere-free combination is used,and the positio- ning results are analyzed comparatively.The conclusionis that the positioning error is more stable and the range of the error fluctuation is smaller when using the carrier smoothed pseudo-range.Currently the horizontal precision of BDS is 10m,and the height precision is better than 20m.And the ephemeris precision of BDS is less than that of GPS,so when the visible satellites of GPS are sufficient,the positioning precision is not significantly improved by adding BDS observations.

Key concepts: Global Positioning System, Precise Point Positioning, Pseudorange, Geodesy, Ephemeris, Computer science, BeiDou Navigation Satellite System, Smoothing

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