GNSS high precision positioning method for intelligent terminal

A technology of intelligent terminal and positioning method, which is applied in the direction of satellite radio beacon positioning system, measuring device, instrument, etc., to achieve the effect of reducing measurement noise and improving calculation accuracy

Active Publication Date: 2019-05-03
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Since May 2016, Google has announced that starting from the Android 7 operating system, it will be able to obtain the GNSS raw measurement informati

Method used

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  • GNSS high precision positioning method for intelligent terminal
  • GNSS high precision positioning method for intelligent terminal
  • GNSS high precision positioning method for intelligent terminal

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Embodiment Construction

[0039] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0040] Such as figure 1 As shown, a kind of intelligent terminal-oriented GNSS high-precision positioning method of the present invention specifically includes the following steps:

[0041](1) At the beginning of positioning, on the one hand, it is necessary to obtain all kinds of original measurement information of the current GNSS systems from the Android system and calculate the original pseudorange, carrier phase, Doppler, carrier-to-noise ratio and pseudorange measurement uncertainty , carrier phase measurement uncertainty and other information required for positioning, and at the same time check the validity of the data to eliminate invalid data; on the other hand, it is necessary to obtain the precise satellite orbit, precise satellite clock difference and precise ionosphere from the server through the network PPP enhancement information. (2) Then...

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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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Application Information

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IPC IPC(8): G01S19/44G01S19/07
Inventor 李子申汪亮王宁波
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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