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Smart-phone-based high-precision single-point positioning method and device

A smart phone, single-point positioning technology, applied in the field of global navigation satellite system satellite positioning, can solve problems such as poor positioning performance and no improved positioning scheme, and achieve the effect of fast convergence speed

Active Publication Date: 2019-09-24
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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  • Smart-phone-based high-precision single-point positioning method and device

Examples

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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 smart-phone-based high-precision single-point positioning method and device. According to the method, the conventional PPP non-combined positioning model is improved and high-precision positioning is performed only by using an original GNSS observation value received by the smart phone without a GNSS reference station. The invention belongs to the technical field of satellite positioning. The positioning method comprises: acquiring observation values, like a pseudo-range and a carrier phase, of an original GNSS of a smart phone; preprocessing data to weaken some error influences and then forming a non-combined model for the original observation values based on an improved accurate single-point positioning method for estimating a double-clock difference; determining weights of all satellite observation values based on a satellite height angle; and carrying out filtering and positioning based on an improved Kalman filtering method to obtain a high-precision single-point positioning result. With the provided positioning method, the positioning accuracy of the smart phone with the plane be superior to 0.9m and the elevation be superior to 1.7m is realized; 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 such as smart phones are indispensable tools in people's life 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, researche...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/42
CPCG01S19/425G01S19/43G01S19/44G01S19/14G01S19/33G01S19/072G01S19/243G01S19/51
Inventor 高成发陈波刘永胜孙璞玉
Owner SOUTHEAST UNIV
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