【摘要】：水下無線通信對人類開發(fā)和利用海洋資源十分關鍵，無論商業(yè)還是軍事方面，水下無線通信都發(fā)揮著極其重要的作用。目前的水下無線通信方式大體分為三類：水下長波無線電通信（主要用于軍事上）、水下無線聲通信與水下無線光通信。相比于其它兩種通信方式，水下無線光通信具有以下優(yōu)勢。首先，通信速率高，光波在水下的通信速率可達Gbps量級；其次，帶寬高，光波頻率高，使其承載能力強；第三，保密安全性高，光通信具有較強的抗電磁波與核輻射干擾能力，且激光光束具有很好的方向性，如被攔截，接收方會迅速發(fā)現(xiàn)中斷事故；最后，具有體積小、功耗低和價格相對便宜等優(yōu)點。 本文基于對水下光通信OOK調制解調系統(tǒng)的研究，完成工作如下： （1）介紹目前水下無線通信的三種主要方式及其優(yōu)缺點，并闡述了水下無線光通信技術的國內外發(fā)展現(xiàn)狀及發(fā)展趨勢。 （2）分析研究海水的光學特性。針對海水的組成成分，分析其對可見光的吸收和散射，依此建立海水信道通信鏈路模型和修正光的水下衰減公式，并根據(jù)不同海水類型計算不同波段光波的傳輸距離。 （3）對OOK、LPPM和DPIM三種調制方式進行分析介紹和性能對比，并選擇OOK調制作為系統(tǒng)調制方式。 （4）闡述了水下無線光通信的基本原理，實現(xiàn)了對發(fā)射光源、光探測器的選型和對調制/解調電路模塊、信號處理電路模塊、系統(tǒng)軟件和防水裝置的設計，并完成了對整個系統(tǒng)的組裝。 （5）通過實驗室水箱實驗驗證了系統(tǒng)的可行性，并利用所設計水下無線光通信系統(tǒng)實現(xiàn)了威海近海岸渾濁水域（漫衰減系數(shù)約為0.5152m-1），，在接收模塊輸入阻抗為34kΩ，通信速率為9600bps時，最大傳輸距離達24m（20m內可實現(xiàn)無差錯通信）與接收模塊輸入阻抗為70kΩ，通訊速率為4800bps時，最大傳輸距離達27m，誤碼率在4103以內的水下無線光通信。
[Abstract]:Underwater wireless communication plays a very important role in the development and utilization of marine resources. At present, underwater wireless communication is divided into three types: underwater long wave radio communication (mainly used in military), underwater wireless acoustic communication and underwater wireless optical communication. Compared with the other two communication modes, underwater wireless optical communication has the following advantages. First, the communication rate is high, the communication rate of light wave can reach Gbps order of magnitude, secondly, the high bandwidth and the high frequency of light wave make the carrying capacity of light wave strong. Third, the security is high, the optical communication has strong ability to resist the interference of electromagnetic wave and nuclear radiation, and the laser beam has good directionality, if intercepted, the receiver will find the interruption accident quickly. Finally, it has the advantages of small size, low power consumption and relatively cheap price. Based on the research of underwater optical communication OOK modulation and demodulation system, the work of this paper is as follows: (1) introduce the three main ways of underwater wireless communication and their advantages and disadvantages. The present situation and development trend of underwater wireless optical communication technology at home and abroad are also described. (2) the optical properties of seawater are studied. According to the composition of seawater, the absorption and scattering of visible light are analyzed, and the communication link model of seawater channel and the underwater attenuation formula of modified light are established, and the transmission distance of light waves in different bands is calculated according to different sea water types. (3) three modulation modes, OOK,LPPM and DPIM, are analyzed and compared, and OOK modulation is chosen as the modulation mode. (4) the basic principle of underwater wireless optical communication is expounded, and the design of emitting light source, type selection of photodetector, modulation / demodulation circuit module, signal processing circuit module, system software and waterproof device are realized. And completed the whole system assembly. (5) the feasibility of the system is verified by laboratory water tank experiment, and the muddy area near the coast of Weihai (diffuse attenuation coefficient is about 0.5152m-1) is realized by using the designed underwater wireless optical communication system. The input impedance of the receiving module is 34k 惟. When the communication rate is 9600bps, the maximum transmission distance is 24m (error-free communication within 20m) and the input impedance of the receiving module is 70k 惟. When the communication rate is 4800bps, the maximum transmission distance is 27m, and the BER is less than 4103.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.3

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