Wireless node relative positioning method based on difference global positioning system

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 ...

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

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