The Research Of Underwater Cooperative Target Signal Detection And Parameter Estimation

The research of underwater target location technology is an important subject in ocean engineering.In order to achieve accurate underwater target positioning,it is necessary to effectively detect target signals in complex ocean environment and obtain accurate delay information.Under the background of underwater target location,this paper focuses on the technology of cooperative target signal detection and parameter estimation,and realizes the underwater acoustic target location signal processing software on hardware platform.In the aspect of signal detection technology,this paper focuses on the signal detection method based on adaptive filtering,which can realize the signal detection under different conditions,and provides an anti-channel multi-path signal detection strategy for the influence of multi-channel on signal detection performance.In the aspect of time delay estimation,the method of time delay estimation based on phase compensation is studied to improve the accuracy of time delay estimation in a certain range.Starting from the inherent defects of LMS method,this paper proposes an improved method based on noise constraint and applies it in the process of time delay estimation.Through simulation experiments,the performance of the improved algorithm is proved to be superior and the accuracy of time delay estimation is improved.In the aspect of signal frequency estimation technology,the frequency estimation method based on adaptive linear prediction is firstly studied,and then the average phase method is combined to reduce the complexity of the algorithm.Analysis for linear prediction order number and filter step length for the influence of frequency estimation performance,linear prediction is given order selection scheme,and research the effect of filter step for frequency estimation performance,in view of the frequency estimation algorithm to change the limitations of environmental adaptation,this article provides a method of approximation most Uber long improvement to improve the performance of frequency estimation.In addition,an improved scheme based on noise suppression is studied on the basis of adaptive line spectrum intensifier,which can have better frequency estimation performance at lower SNR.Finally,the design and implementation of signal processing software for buoy positioning system is carried out,and the overall design of software is realized through the management of SYS/BIOS operating system multi-task thread,and the signal detection process and delay estimation process are realized.The system test and data verification show that the signal processing software designed in this paper can meet the functional requirements stably and reliably,and has certain engineering application value.