【摘 要】
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Real-time and high-precisionMulti-GNSS positioning technical has been playing an important role in the determination of low earth orbiter(LEO) and monitoring of
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Real-time and high-precisionMulti-GNSS positioning technical has been playing an important role in the determination of low earth orbiter(LEO) and monitoring of geologic hazards.The key concern should be on the achievement of the high-precision satellite orbit and clock products.In this paper,real-time clock estimation strategy was introduced.Based on the mean square root filtering method,dates via 35 global uniformly distributed IGS observations were usedto estimate real-time satellite clock errors of GPS and CLONASS,which was proved 0.2ns and 0.8ns respectively.The outcomes were verified again via precise point positioning.Consequently,compared with the positioning accuracy via only GPS,that of GPS and GLONASS improved 26% in X direction,40% in Y direction and 2% in Z direction.The convergence time shorten 2 to 4 times as well.
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