Maritime search and rescue wireless sensing network synergic positioning method

A wireless sensor network and co-location technology, applied in wireless communication, wireless communication services, machine-to-machine/machine-type communication services, etc., can solve the problem of complex dynamic space relative position estimation and analysis, and the accuracy of node signal index measurement. lowering etc.

Active Publication Date: 2017-12-12
SHANGHAI MARITIME UNIVERSITY
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Problems solved by technology

However, for the positioning of the special marine environment, the existing WSN positioning technology still faces challenges
First of all, the sea environment is often prone to strong winds and waves, and the ups and downs of the waves have a shadowing effect on the communication between nodes, so that the measurement accuracy of the node

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  • Maritime search and rescue wireless sensing network synergic positioning method
  • Maritime search and rescue wireless sensing network synergic positioning method
  • Maritime search and rescue wireless sensing network synergic positioning method

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Embodiment Construction

[0087] Below in conjunction with accompanying drawing, by describing a preferred specific embodiment in detail, the present invention is further elaborated.

[0088] figure 2 Denotes a schematic diagram of maritime co-location in wireless sensor networks. People carrying unknown node lifejackets can interact with ships or lifeboats with GPS information, and they can communicate with anchor nodes or other unknown nodes deployed at sea without fixed positions. The distribution nodes (that is, all nodes, including unknown nodes and anchor nodes) are in the search and rescue sea area, and the nodes establish their wireless sensor network through the Zigbee protocol. Suppose there are s anchor nodes and n unknown nodes in the network. S and N represent the set of anchor nodes and the set of unknown nodes respectively, that is, n∈N, s∈S. The location set of the anchor node at time t can be expressed as a vector T stands for transpose. The location set of the same unknown node...

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Abstract

The invention discloses a maritime search and rescue wireless sensing network synergic positioning method which comprises the following steps: S1, establishing a Lagrange model as a marine movement model of a node; S2, acquiring a synergic positioning system model of an unknown node on the basis of an unknown node state model described by an invisible markoff chain and a marine movement model and an observation model of the node, estimating posterior probability distribution by using a particle filter algorithm, and estimating the position of the unknown node according to the estimated posterior probability distribution; S3, improving a likelihood function in the particle filtering algorithm by using KL (Kullback Leibler) divergence, and reducing errors caused by sea wave shielding factors by optimizing parameters; and S4, introducing the likelihood function of the optimized parameters, updating confidence factors and iterative position estimation in a residual error-system resampling mode to alleviate degeneration of particles, and estimating the position of the unknown node. The method has the advantage that positioning errors caused by marine shielding effects and multipath effects on an offshore wireless sensing network are avoided.

Description

technical field [0001] The invention relates to the technical field of marine wireless sensor network node positioning, in particular to a collaborative positioning method for maritime search and rescue wireless sensor networks. Background technique [0002] Since the Titanic accident in 1912, safety of life at sea (SOLAS) has been the focus of attention. With the development of technology, the interference of external irresistible factors can be reduced by equipped with advanced equipment on board. However, due to human factors, accidents at sea are inevitable. As the last line of defense for the safety of human life, Maritime Search and Rescue (MSR) plays a vital role in SOLAS. Traditional search and rescue methods depend on rescuers, and victims have to passively wait for rescue. In order to improve this shortcoming, combining maritime search and rescue with wireless sensor network (Wireless Sensor Network, WSN), victims equipped with sensor nodes can actively display ...

Claims

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Application Information

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IPC IPC(8): H04W4/00H04W64/00
CPCH04W64/006H04W4/70
Inventor 吴华锋梅骁峻
Owner SHANGHAI MARITIME UNIVERSITY
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