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  本文選題：聲納　切入點：發(fā)-收互動　出處：《浙江大學》2014年碩士論文

【摘要】：隨著海洋運輸業(yè)的大力發(fā)展和航船的增多,主動聲納在淺海及近岸海域探測面臨新的挑戰(zhàn)：干擾數(shù)目是目標數(shù)目的一千倍,噪聲能量是信號能量的一千倍。隨著多輸入多輸出(Multiple Input Multiple Output, MIMO)技術在雷達領域的快速發(fā)展,MMO聲納關鍵技術成為新的研究熱點。 本文首先分析了水聲信道的時延擴展和多普勒擴展特性,然后在自由場和波導環(huán)境下,利用平面波模型和簡正模模型分別對其進行表征。針對主動聲納探測主要面臨抗混響的問題,采用時反處理抑制混響。為了提高目標的空-時分辨力,提出了寬帶集中式MIMO處理模型,設計了適合于水聲信道的正交波形。進一步,利用常規(guī)相控陣聲納相干處理的思想,提出了分布式相控MMO聲納處理框架,增強對弱目標的檢測能力。面對淺海波導環(huán)境,利用發(fā)-收互動技術獲得MMO處理所需的高回混比。 主要研究成果包括：1)提出了基于發(fā)-收互動的寬帶分布式相控MMO空時處理模型,并定量分析了其檢測性能；2)面對淺水波導環(huán)境,設計了基于時反聚焦的分布式MMO探測實驗系統(tǒng),實現(xiàn)回混比增強；3)莫干山湖上實驗結果表明分布式相控MIMO聲納系統(tǒng)的探測性能優(yōu)于傳統(tǒng)相控聲納,以及基于時反聚焦的分布式MMO聲納系統(tǒng)的潛力。
[Abstract]:With the rapid development of marine transportation and the increase of ships, active sonar detection in shallow and coastal waters faces a new challenge: the number of interference is 1,000 times the number of targets. With the rapid development of multiple Input Multiple output (Mimo) technology in radar field, the key technology of MMO sonar has become a new research hotspot. In this paper, the characteristics of delay spread and Doppler spread of underwater acoustic channel are analyzed, and then in the free field and waveguide environment, The plane wave model and the normal mode model are used to characterize them respectively. In order to improve the space-time resolution of the target, the active sonar detection mainly faces the problem of anti-reverberation, the time-inverse processing is used to suppress the reverberation. A wideband centralized MIMO processing model is proposed, and an orthogonal waveform suitable for underwater acoustic channels is designed. Furthermore, a distributed phased controlled MMO sonar processing framework is proposed by using the conventional phased array sonar coherent processing idea. In the face of shallow water waveguide environment, the high ratio of return mixing required by MMO processing is obtained by using the technology of transmitting and receiving interaction. The main research results include: (1) proposed a wideband distributed phase-controlled MMO space-time processing model based on space-time interaction, and quantitatively analyzed its detection performance in shallow water waveguide environment. A distributed MMO detection experiment system based on time-reverse focusing is designed. The experimental results on Mogan Mountain Lake show that the detection performance of distributed phase-controlled MIMO sonar system is better than that of traditional phase-controlled sonar. And the potential of distributed MMO sonar system based on time reverse focus.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN919.3

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本文編號：1675676