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TOA-measurement-based optimal target positioning method for wireless sensor network

A wireless sensor network and target positioning technology, which is applied in the field of optimal target positioning of wireless sensor networks based on TOA measurement, can solve the problems that sensors cannot be deployed arbitrarily, and the target positioning accuracy cannot be achieved well, so as to achieve positioning accuracy improvement, The effect of expanding degrees of freedom

Active Publication Date: 2020-07-31
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] However, in WSNs localization, traditional TOA sensor deployments are mostly performed empirically, which cannot mechanistically guarantee the best attainable target localization accuracy.
At the same time, in the emerging sensor deployment methods based on the above optimization indicators, only one or a limited set of optimal geometric deployment solutions can be obtained.
In practical applications, because some areas are occupied by obstacles, some areas have threats, etc., sensors cannot be deployed arbitrarily

Method used

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  • TOA-measurement-based optimal target positioning method for wireless sensor network
  • TOA-measurement-based optimal target positioning method for wireless sensor network
  • TOA-measurement-based optimal target positioning method for wireless sensor network

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Embodiment

[0102] First, target location is implemented with n=3 TOA sensors with an accuracy of σ=1 meter. According to the target-sensor optimal geometric configuration provided by the present invention, relevant parameters are obtained:

[0103] Ψ = {1, 2, 4, 5}, x * ∈ {π / 3, 2π / 3, 4π / 3, 5π / 3}

[0104] According to (16), the closed-loop solution of the ideal target-sensor optimal geometric configuration can be determined immediately Take β 1 = π, get as image 3 Target-sensor optimal geometry shown. Correspondingly, the ideal target location accuracy CRLB is In fact, other forms of target-sensor optimal geometry can be obtained through three equivalent transformations: Figure 4 in image 3 The optimal geometry of (a) is modeled by exchanging the sensor s 2 and s 3 , flipping the sensor relative to the target s 1 , and globally rotate all sensors Δθ=π / 4 with the target as the center, we can get Figure 4 Three equivalent optimal target-sensor geometries shown. Figure 4(a)...

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Abstract

The invention discloses a TOA-measurement-based optimal target positioning method for a wireless sensor network. The method comprises the following steps: initializing a TOA positioning system; determining an ideal target-sensor optimal geometric configuration; and calculating an optimal sensor deployment strategy and a target node position coordinate. According to the invention, in an environmentwith unreliable GPS signals, weak signals or denial signals, sensor dynamic optimal geometric configuration deployment and target positioning in the WSNs based on TOA measurement are realized; targetpositioning and sensor optimal deployment are linked, and the positioning precision of the target positioning is remarkably improved along with the optimal deployment of the sensor.

Description

technical field [0001] The invention relates to the technical field of wireless sensor network positioning, in particular to a method for optimal target positioning of a wireless sensor network based on TOA measurement. Background technique [0002] Target positioning technology based on wireless sensor networks (WSNs) has broad application prospects in military and civilian fields such as battlefield surveillance, environmental monitoring, resource exploration, search and rescue. In WSNs positioning, Time of Arrival (TOA) positioning is especially suitable for target positioning in GPS-denied environments such as indoors, caves, forests, and canyons because of its convenient deployment and high cost performance. At the same time, with the rapid development and application of ultra-wideband (UWB) technology, TOA sensors based on UWB technology can achieve time measurement accuracy of several nanoseconds to tens of nanoseconds, and have great competitive potential in target p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/02H04W4/38
CPCH04W4/02H04W4/023H04W4/38Y02D30/70
Inventor 李银伢戚国庆盛安冬
Owner NANJING UNIV OF SCI & TECH
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