Wireless sensor network node positioning method based on time reversal

A wireless sensor and network node technology, applied in wireless communication, network topology, electrical components, etc., can solve problems such as strong multipath interference and large distance measurement errors between nodes

Inactive Publication Date: 2010-10-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0021] The purpose of the present invention is to overcome the shortcomings of the wireless sensor network positioning method based on distance measurement in a relatively complex electromagnetic environment with strong multipath interference and large distance measurement errors between nodes. Node Location Method for Wireless Sensor Networks

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  • Wireless sensor network node positioning method based on time reversal
  • Wireless sensor network node positioning method based on time reversal
  • Wireless sensor network node positioning method based on time reversal

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] by figure 1 The shown wireless sensor network model is an implementation environment, and the present invention provides a time-reversal-based wireless sensor network node positioning method, such as image 3 shown for figure 1 The wireless sensor network shown, the wireless sensor network includes three reference nodes and two unknown nodes, including steps:

[0035] Step 1: The unknown node sends a request impulse signal to the reference node and records the initial moment at this time. Pick unknown nodes (x 4 ,y 4 ), the unknown node sends to the reference node (x 1 ,y 1 ) to transmit the request impulse signal s(t), and record the initial moment when the unknown node transmits the request impulse signal s(t) at the same time as t 1 .

[0036] Step 2: The reference node receives, inverts and transmits the inversion multipath r...

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Abstract

The invention relates to a wireless sensor network node positioning method based on time reversal, comprising the steps of: 1, sending a request impact signal to a reference node by an unknown node and recording initial time; 2, receiving and reversing by the reference node and sending a reversal multi-path request impact signal to the unknown node; 3, receiving a focusing-arrived reversal multi-path request impact signal by the unknown node and recording receiving time at the moment; 4, calculating the distance away from the reference node by the unknown node according to the initial time and the receiving time; 5, repeating the step 1 to the step 4 until the distances from the unknown node to any three reference nodes are calculated; and 6, calculating coordinates of the unknown node according to the distances from the unknown node to any three reference nodes to complete the positioning of the unknown node. The invention has the benefits of solving the problem of large traditional TOA (Time Of Arrival) positioning errors under a complex environment and ensuring that the system positioning error is less than the working wavelength.

Description

technical field [0001] The technical invention relates to the technical field of wireless sensor networks, and aims at node positioning technology. A wireless sensor network node positioning scheme based on time-reversal technology with high accuracy and suitable for complex electromagnetic environment is proposed. Background technique [0002] Node location is one of the key technologies of wireless sensor networks, it helps us to obtain information about the location of an event, and also helps gateway nodes understand the deployment of the entire network and formulate an efficient routing mechanism. [0003] The positioning technology of wireless sensor nodes can be divided into two categories, which are irrelevant to parameter measurement and related to parameter measurement. The first category of parameter-independent positioning technology is mainly based on the number of hops to the reference node and the estimated distance of each hop to calculate the distance betwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00H04W84/18
Inventor 洪劲松张光旻王巍巍李莉李冰王秉中
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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