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A smart phone-based high-precision single-point positioning method and device

Through the improved precision single-point positioning method, the GNSS pseudo-range and carrier phase observations of the smartphone are used, combined with the static Kalman filter algorithm, to solve the problem of low positioning accuracy of the smartphone and achieve high-precision single-point positioning, which is suitable for Ordinary smartphones have broad application prospects.

Inactive Publication Date: 2021-01-26
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

These studies apply existing navigation and positioning enhancement methods to smartphones, and most of the research objects are Android tablets. For smartphones used by the general public, the current positioning performance is poor.
More importantly, there is no precedent for improving existing localization schemes based on the nature of smartphone raw observations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example

[0093] The experiment took place on 2018.10.19, using a Xiaomi 8 smartphone, and the test site was the GE01 control point on the campus of Southeast University. Five observations were made, each time about 6 minutes, and the sampling interval was 1s. The precise coordinates of this station have been obtained in advance through network RTK.

[0094] Using the method of the present invention to carry out the positioning test on Xiaomi Mi 8 mobile phone, the results are as follows image 3 shown. After observing for a period of time, the errors in the N and E directions of the data in the five time periods can all converge to less than 1m.

[0095] The positioning errors in the five time periods are counted, as shown in Table 3. The average in-plane error is 0.81m, while the average elevation error is 1.65m, which is better than the highest positioning accuracy that can be obtained by using ordinary smartphones.

[0096] Errors in positioning in each time period of the embodim...

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Abstract

The invention discloses a high-precision single-point positioning method and device based on a smart phone. The method of the invention improves the conventional PPP non-combined positioning model, does not need a GNSS reference station, and only uses the original GNSS observation value received by the smart phone to perform high-precision positioning. Positioning belongs to the technical field of satellite positioning. The positioning method of the present invention includes the following steps: obtaining the original GNSS pseudo-range and carrier phase observation values ​​of the smart phone; The observation values ​​form a non-combination model; the weight of each satellite observation value is determined according to the satellite elevation angle; the improved Kalman filtering method is used for filter positioning to obtain high-precision single-point positioning results. Using the positioning method proposed by the present invention, it is possible to realize a positioning accuracy of better than 0.9m in plane and better than 1.7m in elevation for smart phones, and the convergence time is less than 30s.

Description

technical field [0001] The invention relates to a global navigation satellite system (Global Navigation Satellite System, GNSS) satellite positioning method, in particular to a high-precision single-point positioning method and device based on the original GNSS observation value of a smart phone. Background technique [0002] Smart phones are an indispensable tool in people's lives today, and the GNSS (Global Navigation Satellite System, Global Navigation Satellite System) module in the smart phone has greatly improved modern human life. In the development of GNSS navigation and positioning technology, navigation or positioning accuracy has always been a key issue that restricts its further application in human production and life and plays a huge role. The same is true for GNSS navigation and positioning of smartphones. Since the GNSS navigation and positioning modules in smartphones have always been packaged in the mobile phone operating system, researchers can only obtain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/42
CPCG01S19/425G01S19/43G01S19/44G01S19/14G01S19/33G01S19/072G01S19/243G01S19/51
Owner SOUTHEAST UNIV
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