Underwater communication node wake-up signal detection method based on frequency point existence probability

Abstract

The invention provides an underwater communication node wake-up signal detection method based on frequency point existence probability. The method comprises the steps: step 1, a transmitter transmitsa wake-up signal s(t); step 2, a receiver receives a signal with the duration of N*T, and the signal processing duration of each time is T; step 3, the confidence coefficient pn of a chip is set, n is1, 2, ..., N, and qn is compared with pn; if qn is detected to be less than pn, a fact that the signal is not a wake-up signal is judged, the first section of the received signal is abandoned by thereceiver, backwards supplementing is carried out, and detection is restarted; when qn is greater than or equal to pn, the receiver repeats the step 2, the existence probability of the next frequency point is detected according to the frequency sequence until all qn is greater than or equal to pn, and the step 4 is carried out; and step 4, the total confidence coefficient Q is set. According to themethod, the multi-frequency wake-up signals with the same duration are designed, spectral analysis is performed on the received signals in combination with segmented Fourier transform, the existenceprobability of specific frequency points is calculated to judge the signals, and the problems that an existing wake-up detection method is poor in anti-interference capacity, high in omission ratio, high in false alarm probability and the like are solved.

Description

technical field [0001] The invention relates to an underwater communication node wake-up signal detection method based on frequency point existence probability, which belongs to the field of underwater communication. Background technique [0002] The underwater wireless sensor network consists of a variety of wireless sensor nodes. Among them, the fixed underwater nodes can only be powered by batteries due to the limitation of the working environment, and the replacement and maintenance of the node batteries are very difficult. So how to save power consumption is an important content in the design of underwater communication nodes. The duty circuit to control the power supply is a commonly used method to effectively reduce the power consumption of underwater nodes. Nodes are generally designed to work and sleep. In the dormant state, only the on-duty circuit works. Once a wake-up signal is detected, the on-duty circuit controls the power management module to power on the ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a wake-up signal detection method for underwater communication nodes based on the existence probability of frequency points, aiming at the problems of high false alarm probability and complicated calculation of wake-up signal detection for underwater communication nodes, the purpose is to provide a method for underwater communication In the acoustic communication channel, the wake-up signal detection method of underwater communication nodes is robust, reliable and simple in operation, and analyzes the probability of existence of frequency points

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