本文選題：投棄式溫鹽深剖面儀 + 正交頻分復(fù)用技術(shù)�。� 參考：《天津工業(yè)大學(xué)》2017年碩士論文

【摘要】：深海蘊(yùn)藏著豐富的礦產(chǎn)、生物等自然資源,作為一個(gè)海洋大國,深海資源的開發(fā)以及深海水文數(shù)據(jù)的獲取對我國未來的經(jīng)濟(jì)建設(shè)和海上軍事強(qiáng)國戰(zhàn)略都將具有重要的意義。深海投棄式溫鹽深剖面儀(Expendable Conductivity Temperature and Depth Profiling System)簡稱XCTD,是國外近年來研制的一種高性價(jià)比深海探測型設(shè)備,由于其具有走航、實(shí)時(shí)、大面積、低成本和高精度測量的特點(diǎn),自問世以來就得到了海洋學(xué)家和研究學(xué)者的高度關(guān)注�？紤]到儀器重量、成本以及復(fù)雜的海洋環(huán)境等原因,XCTD信道采用的是單根雙股漆包線,信道呈現(xiàn)時(shí)變、低通窄帶、低信噪比的特點(diǎn)。目前XCTD信道主要采用單載波ASK、DPSK傳輸方式,但傳統(tǒng)單載波傳輸方式下提高信號的傳輸速率,信號的幅值將大大減小,在一定的傳輸頻率下,隨著探測深度的增大,信號的幅值衰減越大,因此受信道條件的限制,如何在充分利用有限帶寬資源的同時(shí)進(jìn)一步提高XCTD信道傳輸性能成為了研究的主要目的。本文首先對XCTD信道的電路模型進(jìn)行了優(yōu)化,接著針對XCTD信道的特點(diǎn)進(jìn)行 了分析,提出了 OFDM(Orthogonal Frequency Division Multiplexing)技術(shù)適用于XCTD信道傳輸?shù)募夹g(shù)優(yōu)勢,然后在Simulink平臺上搭建了 XCTD信道的仿真電路模型,在此基礎(chǔ)上建立了 OFDM系統(tǒng)的仿真模型,詳細(xì)對比了 OFDM與單載波傳輸方式ASK、DPSK的仿真結(jié)果,驗(yàn)證了 OFDM技術(shù)在保證XCTD信號傳輸準(zhǔn)確性的同時(shí)提高了信號的傳輸速率。最后,利用RS編碼和過采樣技術(shù)對OFDM仿真系統(tǒng)進(jìn)行了優(yōu)化,通過仿真結(jié)果更進(jìn)一步證明了 OFDM技術(shù)提高XCTD信道傳輸性能的可行性和有效性,對提高XCTD信道傳輸性能的研究提供了一種新的思路。
[Abstract]:Deep-sea is rich in mineral, biological and other natural resources. As a large marine country, the exploitation of deep-sea resources and the acquisition of deep-sea hydrological data will be of great significance to China's future economic construction and the strategy of maritime military power. Expendable Conductivity Temperature and Depth Profiling System) is a kind of high performance-price ratio deep-sea detection equipment developed in foreign countries in recent years. It has the characteristics of navigation, real-time, large area, low cost and high precision measurement. Since its inception, oceanographers and researchers have been highly concerned. Considering the weight, cost and complex marine environment, the XCTD channel adopts single double-strand enamelled wire, which is time-varying, low pass narrowband and low signal-to-noise ratio (SNR). At present, the XCTD channel mainly adopts the single carrier ASK DPSK transmission mode, but under the traditional single carrier transmission mode, increases the signal transmission rate, the signal amplitude will reduce greatly, under certain transmission frequency, with the detection depth increases, Due to the limitation of channel conditions, how to further improve the transmission performance of XCTD channel while making full use of limited bandwidth resources has become the main purpose of the research. This paper first optimizes the circuit model of XCTD channel, then analyzes the characteristics of XCTD channel, and puts forward the technical advantages of OFDM(Orthogonal Frequency Division Multiplexing) technology for XCTD channel transmission. Then the simulation circuit model of XCTD channel is built on Simulink platform, and then the simulation model of OFDM system is established. The simulation results of OFDM and ASK / DPSK are compared in detail. It is verified that OFDM technology not only ensures the accuracy of XCTD signal transmission, but also improves the transmission rate of XCTD signal. Finally, the OFDM simulation system is optimized by using RS coding and oversampling technology. The simulation results further prove the feasibility and effectiveness of OFDM technology to improve the transmission performance of XCTD channel. It provides a new way to improve the transmission performance of XCTD channel.
【學(xué)位授予單位】：天津工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P716

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本文編號：1990361