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Passive underwater target positioning method based on compressed sensing of multipath time delay structure

A technology of compressed sensing and multipath time delay, which is applied in the field of underwater target positioning and underwater acoustic signal processing, and can solve the problem of reducing sampling rate and so on

Inactive Publication Date: 2014-12-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compressed Sensing fuses sampling and compression, greatly reducing the sampling rate without loss of information

Method used

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  • Passive underwater target positioning method based on compressed sensing of multipath time delay structure
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  • Passive underwater target positioning method based on compressed sensing of multipath time delay structure

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Experimental program
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Effect test

Embodiment

[0061] The embodiment is named CS_1. In order to verify the functional characteristics of CS_1, it will be compared with the CS_2 method using the time delay difference between the direct path of the node and the direct path of the reference node for positioning. The comparison performance is mainly the positioning error. The simulation platform is matlab, where The main parameter settings of the simulation scene are shown in Table 1.

[0062] Table 1 Simulation experiment parameters

[0063] Scene parameters

parameter value

Target radiation signal frequency band (Khz)

2.5～5

Power of target radiated signal (dB)

125

Reference Node Frequency (Khz)

40

Non-reference node sampling rate (Khz)

2

Range of positioning area (m)

20×20×20

Distance between adjacent nodes (m)

25

Number of nodes

10

water depth(m)

100

[0064] According to the simulation parameters in Table 1, the nodes...

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Abstract

The invention discloses a passive underwater target positioning method based on the compressed sensing of a multipath time delay structure. The method includes dividing a positioned three-dimensional region into N grid points; distributing a plurality of underground nodes on the shallow seabed, and positioning according to sea surface reflection path signals of nodes and delays of direct path signals of reference paths; performing sparse representation on the receive signals of the nodes under different delays of reference signal receive nodes; then comprising and sampling node data except for the reference nodes by means of random sampling matrix, positioning the central node and acquiring the target position by acquiring the target position sparse vectors by the compressed sensing recovery algorithm according to node observation data. By the aid of the method, the sampling rate of underground nodes can be decreased greatly, the requirements on underwater communication bandwidth are lowered, and the method is adaptive to target positioning in the multipath underwater environment, is easy to implement and has high practical applicant value.

Description

technical field [0001] The invention relates to the field of underwater target positioning, in particular to a passive positioning method for underwater acoustic targets based on compressed sensing of multi-path time-delay structures, and belongs to the technical field of underwater acoustic signal processing. Background technique [0002] The positioning of underwater targets is a very basic and important application in the field of underwater acoustic research, and it is widely used in military and civilian applications. Compared with terrestrial systems, the underwater environment has the following characteristics: the cost of deploying sensors underwater is high, so the sensor density in the underwater sensor network is much lower than that of sensors on land; at the same time, the underwater bandwidth Low, the speed of information transmission is slow, and certain requirements are put forward for data collection and transmission. On the other hand, data obtained at the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 高翔路云
Owner SOUTHEAST UNIV
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