Research On Passive Detection Technology Based On Underwater Submerged Floating Platform

The underwater submerged floating platform is a mini weapons platform capable of long-term submerged floating,unmanned control,and autonomous operation,which can perform real-time monitoring of the surrounding sea area and achieve target strikes.It is also a kind of underwater equipment which is keeping with the trend of unmanned battlefield.The research of this dissertation mainly focuses on the early warning detection and preliminary target detection of submerged floating platforms,studies the early warning detection algorithm,and extract further target features,such as target depth-distance,after low power alert threshold signal detection.The research above will provide pre-signal processing for further complex target identification.First of all,because of insufficient supply of underwater energy,the floating platform needs to adopt an early warning-confirmation detection mechanism to achieve power saving.Combining with the characteristics of target radiation noise,a variety of detection algorithms were analyzed and compared with simulations,and their applicability in underwater warning detection system was analyzed.In addition,according to the characteristics of target radiation noise containing low-frequency line spectrum components,the gain of the adaptive line spectral booster for various detection algorithms was analyzed,and consider the detection of the line spectrum as a method of target verification.Secondly,after confirming the detection of the target,it is necessary to perform preliminary feature extraction on the target.This article introduced the DEMON spectral algorithm,which is a classical target analysis method,and performed simulation analysis.MFCC is a frequently used parameter in speech recognition.In theory,the recognition of human voice and the recognition mechanism of ship radiation noise are the same.Based on this,this paper introduces MFCC to the underwater target feature extraction.Finally,after target feature extraction,the depth-distance element of the target needs to be obtained for more refined identification and positioning.The submerged floating platform is small in size,cannot carry large-scale arrays,and needs to be combined with environmental information for distance measurement.This paper studies a method based on channel multi-path structure that can be used for single hydrophones ranging,which is also called passive time-reversing mirror ranging,and extends it to dual arrays in this paper.Simulation results show that passive time reversal mirror measurement has preferable ranging accuracy.