Weighting trilateration method in local positioning system

A technology of local positioning system and trilateration, applied in positioning, measuring device, transmission system, etc., can solve problems such as large amount of calculation, inability to achieve high precision, and complex maximum likelihood algorithm, so as to improve accuracy and positioning accuracy. , to achieve convenient effect

Active Publication Date: 2012-07-04
58TH RES INST OF CETC
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  • Abstract
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Problems solved by technology

However, the above algorithms all have certain defects. Neither the centroid algorithm nor the trilateration method can achieve high precision; the maximum likelihood algorithm is more complicated and requires a large amount of calculation.

Method used

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  • Weighting trilateration method in local positioning system
  • Weighting trilateration method in local positioning system
  • Weighting trilateration method in local positioning system

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. The invention is a positioning method based on signal energy intensity, and the signal can be a radio frequency signal or an underwater acoustic signal.

[0029] Such as figure 1 As shown in , the black circle represents the mobile node, the hollow circle represents the reference node, and the two-way arrow represents wireless communication. The most basic components of the system can be divided into: (1) no less than 3 reference nodes, each reference node has wireless receiving and transmitting functions, and can communicate with each other through a certain protocol, and its receiving antenna is isotropic. The positions of the nodes are known. (2) One or more mobile nodes to be tested have a wireless transmission function, the transmission frequency and communication protocol are consistent with the reference node, and their transmission antennas ar...

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Abstract

The invention provides a weighting trilateration method in a local positioning system. The weighting trilateration method comprises the following steps of: testing and fitting to obtain a distance curve corresponding to an RSSI (Received Signal Strength Indication) or LQI (Link Quality Indication) value; testing to obtain each distance average range error of the distance curve and taking the reciprocal of the percentage of the distance average range error as a weight; determining an area in which a movable node is located by utilizing three points with a strongest signal; and calculating a position of the movable node by utilizing a trilateration method, wherein the position of the movable node is obtained by a weighting method when two circles do not have a point of intersection, and theposition of the movable node is finally obtained by a manner of obtaining gravity center of the point of intersection. The weighting trilateration method in the local positioning system, disclosed bythe invention, has the advantages that defects that the traditional RSSI and LQI positioning technologies are easy to be influenced by environment inconsistency and have low precision can be overcomethrough a positioning technology.

Description

technical field [0001] The invention belongs to a mobile target positioning method, in particular to a weighted trilateral measurement method in a local positioning system. Background technique [0002] Both RSSI (Received Signal Strength Indicator) and LQI (Link Quality Indicator) are used to detect channel link quality. When the link quality of the channel changes, the values ​​of RSSI and LQI both change. Generally speaking, the greater the distance, the smaller the RSSI and LQI values. Therefore, the curve of the corresponding distance of the RSSI (or LQI) value can be fitted by testing first, and then the corresponding node distance can be obtained through the received RSSI (or LQI). [0003] Currently, most wireless network devices have an RSSI (or LQI) detection function. Utilizing the above characteristics, in a wireless network, the distance from multiple reference nodes to the mobile node (node ​​to be measured) can be calculated by measuring the RSSI (or LQI) v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/00H04B17/00
Inventor 魏斌虞致国黄召军陈子逢万书芹
Owner 58TH RES INST OF CETC
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