Method for positioning underwater sound pulse signal on basis of frequency estimation

Abstract

The invention discloses a method for positioning an underwater sound pulse signal on the basis of frequency estimation, which comprises the following steps of: a step 10 of receiving the underwater sound pulse signal by utilizing a single hydrophone and carrying out estimation of time-frequency distribution with a self-adaption radial gaussian kernel function on a frequency of the underwater sound pulse signal; and a step 20 of implementing positioning on a target by utilizing sound field matching, wherein the step 10 comprises the following steps of: firstly, receiving the underwater sound pulse signal by utilizing the single hydrophone and determining a fuzzy function on a corresponding two-dimensional frequency-deviation-time-lag region for the underwater sound pulse signal; then setting a total dot number of a discretized frequency deviation and a total dot number of a discretized time lag; converting the fuzzy function in a rectangular coordinate system into a fuzzy function in a polar coordinate system; measuring an optimal spread function by adopting an iterative algorithm to obtain time-frequency distribution of the received signal; and determining a central frequency and corresponding instantaneous time of the received signal. According to the positioning method, parameter estimation on the unknown underwater sound pulse signal of a transmitted signal can be implemented by utilizing the signal hydrophone and the transmitted signal is accurately positioned.

Description

technical field [0001] The present invention relates to an underwater target positioning method aimed at the technical field of underwater acoustic signal processing, in particular to a positioning method based on frequency estimation of underwater acoustic pulse signals. Background technique [0002] The underwater acoustic positioning technology plays an extremely important role in the underwater acoustic technology. It is an important and basic problem in the underwater acoustic technology, and it is also a key technology for national economic construction and national defense construction. In underwater acoustic positioning technology, passive positioning technology has always been an important research direction in underwater acoustic technology. At the present stage, the underwater passive positioning technology mostly focuses on the radiation noise of ships, and there are few passive positioning for various underwater acoustic pulse signals in an unknown way of transm...

AI Technical Summary

Problems solved by technology

However, there are few matching field positioning problems in the case of unknown transmitted signals.

Although there have been research reports on this problem, known assumptions are still made on the frequency parameters of the signal. When solving the specific solution, it is still necessary to know the frequency required for the calculation of the forward sound field

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