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RSSI weighted ranging method based on equilateral triangle model

An equilateral triangle and ranging method technology, which is applied in the direction of measuring devices, surveying and navigation, radio wave measurement systems, etc., can solve the problems of low RSSI positioning accuracy and unstable RSSI value, etc., to extend the network life cycle and optimize Calculation amount and positioning accuracy, and the effect of improving positioning accuracy

Inactive Publication Date: 2016-11-16
GUANGZHOU UNIVERSITY
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Problems solved by technology

[0005] Although the RSSI-based ranging algorithm has obvious advantages compared with the time-of-arrival (ToA)-based ranging technology and the time-difference-of-arrival (TDoA)-based ranging technology, this algorithm also has disadvantages
In practical applications, most indoor positioning is in a closed or semi-closed space. Under the interference of various environmental factors such as reflection, multipath, indoor walls and obstacles, the RSSI value will be greatly unstable. The deviation of these RSSI values ​​will have a great impact on the positioning calculation of unknown nodes.
For a long time, this has been the main reason for the low positioning accuracy based on RSSI. How to solve this problem is the key to improving the accuracy of indoor positioning based on RSSI

Method used

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  • RSSI weighted ranging method based on equilateral triangle model
  • RSSI weighted ranging method based on equilateral triangle model
  • RSSI weighted ranging method based on equilateral triangle model

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Embodiment

[0042] Such as figure 1 As shown, the RSSI weighted ranging method based on the equilateral triangle model of the present embodiment includes the following steps:

[0043] (1) initialize the network model of the anchor node; the deployment of the anchor node adopts an equilateral triangle model;

[0044] The equilateral triangle model is a modified equilateral triangle model, such as figure 2 Shown: In the edge area (such as △ABC) that lacks anchor nodes in the network model, an edge correction anchor node (such as AC midpoint D) is deployed at the midpoint of the longest distance from the anchor node; the edge correction anchor Nodes transmit at 75% of the power of other anchor nodes.

[0045] (2) The unknown node periodically sends its own information;

[0046] (3) Each anchor node records the RSSI measurement value of the same unknown node after receiving the information, and records it into the corresponding RSSI array Xn;

[0047] (4) Repeat step (3) 20 times;

[0048...

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Abstract

The invention discloses an RSSI weighted ranging method based on an equilateral triangle model. According to the method, each RSSI is given a weight according to Gaussian distribution, average value calculation is performed to obtain an RSSI optimal value, and the coordinates of an unknown node are calculated according to the RSSI optimal value. Uncertain errors caused by uncertain factors such as walls, various fixed or movable barriers, multi paths and diffraction and the like are reduced. The invention also provides a modified equilateral triangle arrangement model of anchor nodes, a necessary anchor node is added to the marginal area for positioning to reduce the interference of multiple positioning nodes, and the positioning accuracy is improved.

Description

technical field [0001] The invention relates to a wireless sensor network indoor positioning technology, in particular to an RSSI weighted ranging method based on an equilateral triangle model. Background technique [0002] Wireless Sensor Network (WSN for short) is a new network technology that integrates sensor technology, MEMS technology, wireless communication technology and distributed information processing technology. It is a collaboration between sensor nodes to perform real-time perception, data collection, and data analysis and processing operations on the environment or objects in the node deployment area, and send the processed information in the form of radio, in the form of ad hoc multi-hop The network method is transmitted to the network end users who are interested in it. WSN has many incomparable advantages: high reliability, strong flexibility, self-organizing ability, random distribution, and no need for wired network support. Wireless sensor networks ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00G01C21/20G01S5/02
CPCH04W64/00G01C21/206G01S5/02H04W64/006
Inventor 刘贵云邵炜祥李致富柳晶晶舒华王佳庆唐冬
Owner GUANGZHOU UNIVERSITY
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