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Wireless node relative positioning method based on difference global positioning system

A differential global positioning and wireless node technology, which is applied in satellite radio beacon positioning system, positioning, radio wave measurement system, etc., can solve the problems of large node position error, differential positioning method no longer applicable, unfavorable node coordination, etc. , to achieve the effect of improving the relative position accuracy

Inactive Publication Date: 2008-07-30
SHANGHAI JIAO TONG UNIV
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AI Technical Summary

Problems solved by technology

Its disadvantage is that the position of the base station is fixed and cannot be moved, and the precise position of the base station needs to be known
In these applications, the working nodes are randomly distributed in a given environment area, and the nodes can be positioned by GPS, but the precise coordinates of the nodes cannot be obtained
Moreover, the nodes may move, and some nodes cannot be fixed as base stations. The above differential positioning method is no longer applicable
At this time, if the single-point GPS is directly used for positioning, the position error between nodes is too large, which is not conducive to the coordination between nodes

Method used

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  • Wireless node relative positioning method based on difference global positioning system

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Embodiment Construction

[0025] Below in conjunction with the accompanying drawings, the embodiments of the present invention are described in detail: the present embodiment is implemented on the premise of the technical solution of the present invention, and provides detailed embodiments and specific operation processes, but the protection scope of the present invention is not limited to the following described embodiment.

[0026] The specific implementation process of the present invention can be a flowchart of the interaction between nodes in the relative positioning process as shown in FIG. 1, and the steps are as follows:

[0027] Step 1: Before the nodes perform mutual positioning, all nodes perform timing synchronization through the GPS module, and perform a timing synchronization operation every specified time to ensure that all nodes have the same time reference.

[0028] Step 2: Each node in the network selects the node that initiates the positioning request through positioning competition....

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Abstract

The invention discloses a wireless node relative positioning method based on differential global positioning system, which belongs to the technical field of wireless communication. Nodes start positioning competition after an synchronization with a GPS module, a node with successful competition sends a positioning request, and other nodes enter a positioning response state after receiving the positioning request; At the positioning time of arrival specified by the positioning request, the node starts sampling the GPS module output, and the node in positioning response returns a positioning response composed of the positioning data and the positioning information back to the node sending the positioning request; and the node receiving the positioning response processes the positioning data, if satisfying the positioning calculation condition, the relative position between two nodes are calculated and the calculation result to the node sending the positioning response is sent in wireless way, otherwise, the positioning response is discarded. The invention can obtain higher positioning accuracy of relative position under the conditions of being unable to determine the accurate position of the reference station, with a shifting reference station or without a stationary reference station.

Description

technical field [0001] The invention relates to a positioning method in the field of communication technology, in particular to a wireless node relative positioning method based on a differential global positioning system. Background technique [0002] Differential positioning, also called relative positioning, is a method of determining the relative position between observation points based on the observation data of two or more receivers. Using differential positioning technology, errors caused by satellite clock errors, ephemeris errors, and SA policies can be completely eliminated, and propagation delay errors caused by ionospheric refraction and tropospheric refraction can be partially eliminated. The working principle of the differential method currently used is the same, that is, the correction number is sent by the reference station, and the user station receives and corrects the measurement results to obtain accurate positioning results. The difference is that the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02G01S19/42
Inventor 陈佳品双兵李振波
Owner SHANGHAI JIAO TONG UNIV
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