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GPS multi-path effect correction and positioning method and system

A multipath effect and positioning method technology, applied in the field of GPS positioning, can solve the problems of complex improvement methods and poor results, and achieve the effects of reducing multipath effects, improving positioning accuracy, and low cost

Active Publication Date: 2016-06-08
THE HONG KONG POLYTECHNIC UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method to correct the position by directly calculating the position correction number based on the distance difference between the reflected signal and the direct signal, aiming at the defect that the multipath effect improvement method of the existing GPS positioning is complicated and the effect is not good. GPS Multipath Correction Positioning Method and System

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  • GPS multi-path effect correction and positioning method and system
  • GPS multi-path effect correction and positioning method and system
  • GPS multi-path effect correction and positioning method and system

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0037] In the application of GPS in the urban environment, due to the obstruction of buildings, the satellite signal received by the GPS receiver is itself a reflected signal. This will cause a large error in GPS positioning in an urban environment. Aiming at this kind of situation, the present invention proposes a new method suitable for GPS urban positioning and reducing multipath effect, so that the positioning accuracy of GPS in densely built urban areas is greatly improved. The invention can be directly used in the positioning mode of the GPS mobile phone.

[0038] see figure 1 , is a flow chart of the positioning method for correcting GPS multipath effects according to a preferred embodiment of the present invention. Such as figure 1 As s...

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Abstract

The invention relates to a PS multi-path effect correction and positioning method and system. The method comprises: S1, an initial position of a receiver is calculated according to a GPS pseudo-range observation value measured by the receiver; S2, a position correction value is calculated based on an estimated distance difference between a reflection signal and a direct signal; and S3, according to the initial position of the receiver and the position correction value, a corrected position is obtained. According to the invention, the position correction value is calculated based on the estimated distance difference between the reflection signal and the direct signal and thus the position of the receiver can be corrected, so that the multi-path effect is reduced and the positioning precision of the GPS in an urban building compact district can be substantially improved. Moreover, the method is simple; the cost is low; and the method and system can be directly applied to a positioning mode of a GPS phone.

Description

technical field [0001] The present invention relates to the technical field of GPS (Global Positioning System) positioning, and more specifically relates to a positioning method and system for correcting GPS multipath effects. Background technique [0002] GPS technology plays a revolutionary role in the development of positioning technology. GPS can provide high-precision navigation and positioning around the clock. As the price of GPS receivers decreases day by day, GPS receivers have been installed in a large number of mobile phones now, and the sensitivity of the receivers is getting higher and higher. [0003] However, in the urban environment, due to the reflection of GPS signals by a large number of buildings, a strong multipath effect is caused, which greatly reduces the positioning accuracy of GPS, and sometimes the positioning error can reach 200 meters. Over the years, scientists from various countries have done a lot of research on the impact of multipath effec...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/22
Inventor 陈武
Owner THE HONG KONG POLYTECHNIC UNIV
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