Positioning method and device

Abstract

The invention provides a positioning method and device. The positioning method comprises the following steps: an instantaneous acceleration measurement volume of a mobile terminal is acquired; an instantaneous speed of the mobile terminal is acquired; a GPS signal is received; a positioning point track is acquired; the strength of the received GPS signal is contrasted with a preset threshold value; when the strength of the GPS signal is higher than the preset threshold value, instantaneous speed calculation adjustment parameters and displacement calculation adjustment parameters are acquired; the instantaneous speed, the instantaneous speed calculation adjustment parameters and the displacement calculation adjustment parameters of the mobile terminal are corrected; whether landmark information is perceived is judged; if yes, the perceived landmark information is verified with standard map information, and the positioning track of the mobile terminal is corrected. According to the positioning method and device, a motion sensor is used for calculating the state of the mobile terminal in real time, positioning accuracy is adjusted in real time by means of perceiving special landmarks in the running process, and therefore the requirement for positioning a vehicle accurately in real time in a city is met.

Description

technical field [0001] The present invention relates to the technical field of positioning, in particular to a positioning method and device. Background technique [0002] In the past few years, positioning technology has developed rapidly, and many techniques have been proposed to achieve high-precision positioning. In outdoor situations, GPS and its variants are the most common positioning technology, capable of providing precise positions for a variety of applications. However, in cities, there are situations where the GPS signal is unstable or even non-existent, which will directly lead to the instability of urban navigation. For example, experiments conducted in downtown Chicago, Illinois, USA, evaluated the positioning performance of GPS in the city. According to the experimental results, the observed GPS signal is very weak. Due to the presence of tall buildings around some roads, the GPS signal is extremely unstable and even completely blocked, especially some comp...

AI Technical Summary

Problems solved by technology

[0004] However, the difficulty of using motion sensors for outdoor positioning in real time is that the measured objects do not have specific behavior rules, so it is difficult to estimate the driving speed and distance

For example, through the positioning of the vehicle by the motion sensor, various unpredictable road sections and complex road conditions will be encountered during the driving process of the vehicle. big error

In addition, due to the mechanical structure of the motion sensor itself, the sensor itself will contain a large mechanical error and measurement error, so the error of the speed and distance obtained by the aforementioned integration method will accumulate

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