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A Method of Improving Localization Coverage in Underwater Acoustic 3D Sensor Networks

A sensor network and coverage technology, applied in the field of underwater acoustic sensor network communication, can solve the problems of frequent power replacement, MIMO technology application obstacles, small size, etc., and achieve the effect of improving positioning coverage

Inactive Publication Date: 2016-03-23
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the application of MIMO technology has been hindered
[0005] The nodes in the underwater acoustic sensor network are highly integrated and relatively small in size, which limits the capacity of the battery, and the complex and changeable underwater environment makes it impossible to replace the power supply frequently
However, MIMO technology requires multiple antennas at the transmitter and receiver, which is impractical for small, energy-constrained underwater acoustic sensor network nodes

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  • A Method of Improving Localization Coverage in Underwater Acoustic 3D Sensor Networks

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Embodiment Construction

[0019] The present invention forms a virtual MIMO by adding cooperation points in the positioning, so as to improve the positioning method of the positioning coverage. In this method, it is assumed that the nodes are all static and do not change with time, the speed of sound does not change with depth, sea temperature, salinity, etc., and the time synchronization problem is not considered. There are at least four anchor nodes whose positions are known, and every three anchor nodes are not on the same straight line, and every four anchor nodes are not on the same plane. Let four anchor nodes whose positions are known be A, B, C, D, and another node whose coordinates are unknown be S. Select the adjacent nodes of anchor nodes A, B, C, and D as their respective collaboration points. For the convenience of description, here we take A as an example and select a collaboration point R A . The coordination point and A form two sending ports, and together with the receiving port S, a...

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Abstract

The invention belongs to the technical field of underwater sound sensor network communication, and relates to a method for expanding a positioning coverage area in an underwater sound 3D sensor network. The method includes the steps that four anchor nodes are selected and send signals to cooperation points and unknown nodes respectively at the same time; after the cooperation points receive the signals from the anchor nodes, the signal are decoded and then recoded and sent to the unknown nodes; when the unknown nodes receive the signal from the anchor nodes, the time when the signal reach to is recoded; the signals from the anchor nodes and the signals of the cooperation points corresponding to the anchor nodes are combined to obtain information sent by the anchor nodes; ID numbers of the anchor nodes, the time when the signals are sent and positions of the anchor nodes are obtained; the distances from the anchor nodes to the unknown nodes are obtained; the distances from the four anchor nodes to the unknown nodes and corresponding coordinates of the anchor nodes are obtained to carry out positioning. According to the method, multipath fading underwater sound channel characteristics and limited node power are sufficiently considered, and the node positioning coverage area can be expanded.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic sensor network communication, and specifically relates to a method for improving positioning coverage in a 3D structure mode. Background technique [0002] Underwater Acoustic Sensor Networks (UASNs, UnderwaterAcousticSensorNetworks) is a wireless sensor network composed of various underwater sensor nodes, which uses underwater acoustics as the communication medium and aims at ocean monitoring. It is a necessary means for ocean monitoring. The nodes in the network use sensors to monitor in real time and collect various monitoring information in the network distribution area. After information processing such as data fusion, the real-time monitoring information is sent to the surface base station through the underwater node with long-distance transmission capabilities, and then through the near Shore base stations or satellites deliver real-time information to users. However, in most a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W64/00H04W84/18G01S5/18
Inventor 金志刚姚贵丹张俊亮
Owner TIANJIN UNIV
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