GNSS high precision positioning method for intelligent terminal

Abstract

The invention discloses a GNSS high precision positioning method for an intelligent terminal. Original pseudorange observation values are smoothed by measuring a Doppler observation value with low noise and no cycle slip, and the measurement noise of the original pseudorange observed quantity of an intelligent terminal GNSS can be significantly reduced; a real-time precise satellite orbit and theclock difference correction information are utilized to precisely modify a satellite orbit and the clock difference calculated through the broadcast ephemeris and clock difference parameters, and calculation accuracy of the satellite orbit and the satellite clock difference can be significantly improved; the ionospheric delay information is accurately calculated through utilizing the real-time precise ionospheric information, and high precision correction of the ionospheric delay error can be realized; the pseudorange and carrier phase measurement uncertainty information is utilized to performpseudorange and carrier phase observed quantity variance, contribution of measurement accuracy of different satellite observed quantities to positioning solution can be more effectively distinguished, and the intelligent terminal can be finally substantially improved, especially for positioning performance of an intelligent handset.

Description

technical field

[0001] The invention belongs to the technical field of precise single-point positioning of a global satellite navigation system, and in particular relates to a GNSS high-precision positioning method for intelligent terminals. Background technique

[0002] Under normal circumstances, existing satellite navigation terminals can be divided into two types: measurement type and navigation type; the former usually has higher positioning accuracy, but its bulky size and high cost are only used in special industries such as surveying and mapping, earthquake, and meteorology; the latter positioning The accuracy is usually low, but it has the advantages of low cost, low power consumption, small size, and easy integration. It is widely used in public location services and has a huge number of potential users. Compared with measurement terminals, navigation terminals can usually only obtain single-frequency pseudorange, carrier phase, and Doppler observations, and due to...

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