Stable underwater communication node awakening signal detection method

A wake-up signal and underwater communication technology, applied in wireless communication, sustainable communication technology, advanced technology, etc., can solve the problems of low frequency resolution, poor ability to adapt to environmental noise, and increase false alarms

Active Publication Date: 2016-04-06
HARBIN ENG UNIV
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Problems solved by technology

Its main disadvantages are: first, the frequency resolution is low, and false alarms are significantly increased when similar frequencies interfe...

Method used

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  • Stable underwater communication node awakening signal detection method
  • Stable underwater communication node awakening signal detection method
  • Stable underwater communication node awakening signal detection method

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] The main purpose of the present invention is to provide a wake-up signal detection algorithm for underwater wireless sensor network communication nodes, by designing dual-frequency or multi-frequency wake-up signals with similar frequencies, combined with chirp Z transform (ChirpZTransform, CZT) on the unit circle ) to refine the spectrum, and use the relatively constant characteristics of frequency interval and amplitude parameters to discriminate the signal, so as to solve the problems of poor anti-interference ability and high false alarm in existing methods. The specific technical scheme is as follows:

[0034] 1. The reference form of the transmitted wake-up signal is shown in formula (1):

[0035] r ( t ) = Σ k = ...

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Abstract

The invention discloses a stable underwater communication node awakening signal detection method. The stable underwater communication node awakening signal detection method comprises the following steps of: S1, emitting a dual-frequency or multi-frequency awakening signal; S2, according to a set initial frequency, transform point number and frequency resolution ratio, executing CZT (chirp z transform) on a unit circle on the awakening signal; S3, searching an extreme value of a zoom spectrum of CZT, judging a signal as the awakening signal if an estimated relative frequency interval and relative amplitude relationship between frequency components are kept unchanged, or judging the signal is not the awakening signal; and S4, after the signal is determined as the awakening signal, powering on an integral communication node to enable the node to be transferred into a working state, and when the node completes working, cutting off a power supply to enable the node to be transferred into a sleeping state. According to the stable underwater communication node awakening signal detection method disclosed by the invention, due to the high frequency resolution ratio, multiple groups of frequencies can be adopted for combination to awaken a plurality of nodes of an underwater sensor network without worrying about mutual interference, so that detection false-alarm is greatly reduced and a service life of the underwater wireless sensor network is prolonged.

Description

technical field [0001] The invention belongs to the field of underwater communication, and in particular relates to a robust method for detecting wake-up signals of underwater communication nodes. Background technique [0002] Underwater wireless sensor networks are mainly divided into two types: underwater data monitoring network and underwater data transmission network according to their functions. These networks are composed of various wireless sensor nodes, including fixed communication or gateway nodes such as various floating / submersible buoys, and various mobile nodes such as UUV or surface ships. Fixed communication or gateway nodes need to perform monitoring and data transmission tasks underwater for a long time, so they can only be powered by batteries, especially the batteries of nodes deployed in the open sea are not easy to update and maintain, so power consumption is reduced and the working time of nodes is extended , which is the prerequisite for the long-ter...

Claims

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Application Information

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IPC IPC(8): H04W52/02H04W24/04H04B13/02
CPCH04B13/02H04W24/04H04W52/0225Y02D30/70
Inventor 聂东虎乔钢刘凇佐孙宗鑫周锋刘秉昊青昕马帅张义
Owner HARBIN ENG UNIV
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