Node positioning method based on initial state and moving state of mobile node in WSN

Abstract

The invention, which relates to the technical field of wireless sensor positioning, provides a node positioning method based on an initial state and a moving state of a mobile node in a wireless sensor network (WSN). The method comprises an initial-state positioning part and a mobile-state positioning part. In the initial-state positioning part, a to-be-located node broadcasts an RF signal and a US signal to a beacon node in a network; according to the beacon node, an information group number is returned; with utilization of a trilateration method, a node coordinate calculation method introducing a correction value, and a multi-signal-based positioning algorithm, an initial coordinate is calculated and is recorded; an initial speed, an accelerated speed, and a moving direction of the motion of a node are set manually and mobile-state positioning is started; after a positioning node moves randomly, own information is broadcasted and the number of neighbor beacon nodes is collected; thenumber of neighbor beacon nodes is determined; and according to a mobile node positioning method based on historical states, final positioning of the mobile node is realized. According to the invention, the positioning error is suppressed effectively in an indoor non-line-of-sight environment; the positioning success rate is increased; and high positioning applicability is improved.

Description

technical field [0001] The invention relates to the technical field of wireless sensor positioning, in particular to a node positioning method based on the initial state and the mobile state of a mobile node in a WSN. Background technique [0002] Wireless Sensor Network (WSN for short) is an ad hoc network composed of a large number of sensor nodes with perception, computing and communication capabilities. In WSN, nodes are randomly distributed to different detection locations. Nodes are responsible for collecting information, processing information, and transmitting information, and sending the obtained data information to the aggregation node to facilitate managers to perceive and monitor the objective physical world. In WSN, positioning technology enables each node in the network to obtain its own position coordinates to ensure the monitoring of targets in the network, data collection and sharing, and prediction. [0003] Since the 1990s, WSN has gradually entered peopl...

AI Technical Summary

Problems solved by technology

Among the existing positioning technologies, the outdoor positioning technology based on GPS or Beidou is relatively mature. However, due to the influence of obstacles in the indoor environment, the communication between nodes will only reach the signal receiving end through diffraction and reflection, which will make the positioning information relatively difficult. Large error, unable to meet the requirements of indoor high-precision positioning

In view of the limitations of the existing positioning technology application environment, insufficient application capabilities, and the need to improve the positioning accuracy of indoor mobile nodes, how to involve high-precision, low-complexity, and low-power indoor mobile node positioning methods has become a sensor network positioning method. Difficult problems to be solved urgently in the research

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