Method for positioning water sound pulse signal matching field based on frequency domain least squares method

Abstract

The invention discloses a method for positioning a water sound pulse signal matching field based on a frequency domain least squares method. The method comprises the following steps of 10) measuring and calculating a sound field of a double-array element hydrophone by using a sound field propagation model, i.e. determining a search range of a sound source, within an observation range, performing grid point division on the observation range, obtaining grid areas, and for each grid area, by using the sound field propagation model and an ocean environment parameter serving as the input value of the sound field propagation model, measuring and calculating through the sound field propagation model to obtain channel pulse response, which is generated by excitation on each hydrophone, of the sound source in each grid area; and 20) according to the water sound pulse signal received by the double-array element hydrophone and the measured and calculated channel pulse response through the sound field propagation model, performing matching field positioning on a target. With the adoption of the positioning method, the water sound pulse signal can be still positioned under the condition that the prior information of a transmitting signal is not enough, and the problems caused in a traditional multi-sensor array processing way are overcome.

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 a matching field of an underwater acoustic pulse signal based on a frequency domain least square method. 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 this stage, the underwater passive positioning technology is currently working around the radiation noise of ships, and there are few passive positioning for various underwater a...

AI Technical Summary

Problems solved by technology

However, in passive positioning technology, due to the limited prior information of the transmitted signal, it often needs to be carried out under the condition that the transmitted signal is unknown, which further increases the difficulty of positioning.

In addition, when the number of elements in the traditional matching field processing technology decreases, the fuzzy surface sidelobes output by the positioning result are high, and the target cannot be accurately positioned, which has also become a bottleneck that plagues this technology.

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