Method for determining relative positions of nodes of linear wireless sensor network based on RTT

Abstract

The invention discloses a method for determining a relative position of a linear wireless sensor network node based on RTT (Round Trip Time). The method comprises steps of forming samples between thenodes through response and confirmation of round-trip time values between N times of measurement and neighbor nodes, and taking weighted average values of the samples in the samples as RTT values between the samples and the neighbor nodes; arranging the RTT values of the neighbor nodes received by each node from small to large; searching a node relationship in which the difference of the RTT values is greater than a threshold C in the neighbor nodes of each node; forming a result set by the records obtained by all the nodes; traversing all possible permutations of the continuous node set, wherein the finally generated permutations are effective permutations conforming to test data results; and sequentially connecting all the continuous node sets according to an effective arrangement sequence to obtain a relative position relationship of the whole linear network. The method overcomes the defect that the stability of the determined position is poor due to the fact that the received signal strength error is too large, and is not disturbed by the uncertain orientation of the wireless node antenna and the remaining battery power.

Description

technical field [0001] The invention relates to a method for determining the relative position of a linear wireless sensor network node based on RTT, and belongs to the technical field of wireless communication. Background technique [0002] Wireless Sensor Network (WSN, Wireless Sensor Network), as an important supporting technology of the Internet of Things, is mainly used in front-end data collection and IoT control. In many practical applications of wireless sensor networks, it is necessary to determine the location of communication nodes, such as in the case of structural detection of buildings and intrusion prevention. In some network topologies, such as linear wireless sensor networks deployed along roads, bridges and roadways, positioning does not need to determine the precise coordinates of nodes, but only needs to know the relative positions between nodes, which requires the use of Under the limited computing resources and energy consumption of nodes, the relative...

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Problems solved by technology

[0004] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a method for determining the relative position of a linear wireless sensor network node based on RTT, which overcomes the defect in the prior art of poor stability in determining the position due to excessive errors in received signal strength , the hardware requirements for nodes are low, and it is not interfered by the antenna orientation of wireless nodes and the uncertainty of remaining battery power, so that the accuracy and speed of network node location determination are greatly improved

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