本文選題：被動聲納信號仿真 + 非平穩(wěn)模型��； 參考：《東南大學》2016年碩士論文

【摘要】：被動聲納系統(tǒng)通常處于時間和空間不斷變化的環(huán)境,聲納基陣接收到的信號呈現(xiàn)出一定的時變特性。為了給聲納陣列信號處理技術(shù)提供多樣化的逼真仿真數(shù)據(jù),本文圍繞被動聲納的工作原理,研究了聲納目標及平臺不斷運動的時變空變環(huán)境下的被動聲納陣列信號仿真方法,并設(shè)計研制了基于TigerSHARC201芯片的實時被動聲納陣列信號仿真系統(tǒng)。論文的主要工作如下：1、介紹了被動聲納陣列信號仿真的需求和實現(xiàn)過程,整個仿真系統(tǒng)包括五個基本模塊,分別為目標運動軌跡仿真、目標輻射噪聲仿真、水聲信道仿真、陣元信號仿真和海洋環(huán)境噪聲仿真。2、分析了由于目標和平臺不斷運動,被動聲納所處環(huán)境在時間和空間上不斷變化,從而引起的被動聲納信號時變特性,包括艦船輻射噪聲的非平穩(wěn)性、不可忽略的多普勒頻移,以及平臺機動時的拖曳陣陣形畸變。3、研究了時變空變環(huán)境下的被動聲納陣列信號仿真方法,以克服傳統(tǒng)仿真方法在被動聲納信號時變特性仿真上的局限性。針對非平穩(wěn)艦船輻射噪聲的仿真,提出了參數(shù)非平穩(wěn)的建模方法,包括時變譜級、連續(xù)譜以及線譜的仿真；對于目標和平臺相對運動引起的不斷變化的多普勒頻移,提出基于精確時延濾波器的多普勒頻移實時仿真方法；針對拖曳陣平臺機動引起的陣形畸變,分別采用圓弧和正弦近似的處理方法,仿真陣形畸變時的被動聲納信號。4、基于TigerSHARC201高速并行信號處理系統(tǒng),設(shè)計并構(gòu)建了被動聲納陣列信號實時仿真系統(tǒng)。給出了系統(tǒng)總體架構(gòu)及各模塊實現(xiàn)方法,進行了各模塊的編程實現(xiàn)以及串聯(lián)調(diào)試,實現(xiàn)了水聲環(huán)境時空變化、目標平臺運動、目標和環(huán)境噪聲特性可選等條件下的實時信號仿真輸出,并通過仿真數(shù)據(jù)分析驗證了本文所設(shè)計的被動聲納陣列信號實時仿真系統(tǒng)的可行性及其性能。
[Abstract]:Passive sonar system is usually in the environment of changing time and space, and the signals received by sonar array show certain time-varying characteristics. In order to provide a variety of realistic simulation data for sonar array signal processing technology, this paper focuses on the working principle of passive sonar, and studies the simulation method of passive sonar array signal under the time-varying space-variant environment where the sonar target and platform are constantly moving. A real-time passive sonar array signal simulation system based on TigerSHARC201 chip is designed and developed. The main work of this paper is as follows: 1. The requirement and realization of passive sonar array signal simulation are introduced. The whole simulation system includes five basic modules: target trajectory simulation, target radiated noise simulation, underwater acoustic channel simulation. Array element signal simulation and ocean environment noise simulation. 2. The time-varying characteristics of passive sonar signal caused by the continuous movement of target and platform and the continuous change of time and space in the environment of passive sonar are analyzed. The simulation method of passive sonar array signal in time-varying space variant environment is studied, including the non-stationarity of ship radiated noise, the non-negligible Doppler frequency shift, and the trailing array shape distortion .3. In order to overcome the limitations of traditional simulation methods in passive sonar signal time-varying characteristics simulation. For the simulation of non-stationary ship radiated noise, a non-stationary modeling method is proposed, including the simulation of time-varying spectrum, continuous spectrum and line spectrum, and the changing Doppler frequency shift caused by the relative motion of target and platform. A real-time Doppler frequency shift simulation method based on accurate time-delay filter is proposed, and the circular arc and sinusoidal approximation are used to deal with the formation distortion caused by maneuvering of towed array platform. Based on the TigerSHARC201 high-speed parallel signal processing system, the real-time simulation system of passive sonar array signal is designed and constructed. The overall architecture of the system and the implementation method of each module are given, and the programming and debugging of each module are carried out. The spatio-temporal change of underwater acoustic environment and the movement of target platform are realized. The real time signal simulation output under the condition of target and environment noise characteristics is optional, and the feasibility and performance of the passive sonar array signal real-time simulation system designed in this paper are verified by the simulation data analysis.
【學位授予單位】：東南大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TN911.7

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