Method for realizing precise geometrical positioning in wireless network

Abstract

The invention relates to a method for realizing precise geometric positioning in a radio communication network, which comprises the following steps: a. screening out the most typical RSSI value of points to be tested in the radio network; b. calculating the distance between the points to be tested and reference points; c. determining the location information of the points to be tested according to the information of the distance between the points to be tested and the two reference points, and the information of the locations of the two reference points; and d. determining the final positioning information of the points to be test according to the location information of a plurality of groups of points to be tested. Compared with the prior zone location and simple weighted average location, the method adopts the most basic geometric method to locate the points to be tested and significantly increases the precision. By using the method of combining the equation of a circle and a trigonometric equation is adopted, a quadric equation set in two variables is transformed into a quadric equation set, thereby simplifying procedure realization. Different processing methods are adopted according to different forms of circle intersection, all situations that are possible to occur are handled wherever possible, thereby ensuring the practicability of the method.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a positioning method in a wireless network, in particular to a method for realizing precise geometric positioning in a wireless network. Background technique [0002] RSSI (Received Signal Strength Indicator) is used to detect the channel link quality. When the channel link quality changes, the RSSI also changes. That is, when the interference is not considered, the farther the distance is, the smaller the RSSI is, and vice versa. [0003] Nowadays, most wireless network devices provide link detection function. Through the change of RSSI, the distance between the point to be measured and the reference point is calculated, and then the positioning information of the point to be measured is calculated by the distance from multiple reference points. It has become a wireless An important function of the network. [0004] However, the positioning function of most wireless network...

AI Technical Summary

Problems solved by technology

[0004] However, the positioning function of most wireless networks is limited to regional positioning, that is, through a simple comparison of the RSSI value, the position of the reference point with the largest RSSI is obtained as the position of the point to be measured, or the RSSI of the two reference points is simply weighted Calculate the average value between two points on the straight line as the position of the point to be measured

Its positioning accuracy is very low, which basically cannot meet the application requirements

There are also some positioning products that use E-Euclidean centralized positioning algorithm and maximum likelihood algorithm, but the algorithm is relatively complicated and difficult to understand and computer programming

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