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摘要摘要在当今社会， 我们的生活随着无线通信技术科技的发展也在不断的变化着。 宿舍中的WiFi让我们足不出户就可以获取与分享各类信息，这些无线通信使用电磁波信号在空气中传播进行信息交换。而如今在水下，我们面临着一个挑战——由于电磁波的特性，无线电波不能在水下很好的传输；由于光的吸收和散射以及水域环境的影响，光波通过水域后能量会被大幅削弱。随着水下传感器和无人系统的普及，急需建立一种水下通信系统以解决这个问题。然而物理连接有着其限制媒介的局限性，因此建立水下无线通信系统是一种更加可行的方案。但是建立水下无线通信系统面临着非常大的难题，这是一种挑战。对于水下光通信的发射系统来说，光源的选择和驱动电路的设计是两个核心要素。不同波长的光波在水中的衰减系数是不同的， 需要根据根据情况选择最适宜的波长的光作为光源；驱动电路的设计上要对恒流 LED 进行驱动，先进行PWM 调试，在通过驱动电路驱动，最后由光源发送信号。本次课程设计要求设计的水下无线光通信发射机尽量达到功耗低，传输稳定，短距离传输速率高等特点。41321
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毕业论文关键词：电磁波 无线通信 水下光通信 光源选择 驱动电路设计
Title Underwater wireless optical communication transmissionsystem
Abstract Nowadays, our life is continuously changing with the development of wirelesscommunication technology. Information exchange mobile communication seems thewhole world is connected up, these are the use of wireless communication can betransmitted electromagnetic signal characteristics in the air; the dorm so thatwe can stay at home WiFi access and share all kinds of information . We are facedwith a challenge - because of the nature of electromagnetic waves, radio wavescan not transmit well in the water; after due to absorption and scattering of lightand water environment, the light through the waters of the energy will be greatlyreduced . With the popularity of underwater sensors and unmanned systems, weurgently need to build an underwater communication system to solve this problem.Establish a physical connection is the simplest possible technical means, suchas fiber optic link. However, the physical connection has its limitations restrictthe media, thus establishing underwater wireless communication system is a moreviable option. However, in the underwater environment, the establishment ofwireless communication will be faced with greater challenges.For underwater optical communication transmission system, the design of the lightsource selection and drive circuit are two core elements. Different wavelengthsof light attenuation coefficient in the water is different, we need to choose themost appropriate under the circumstances as the wavelength of the light source;to drive constant current LED drive circuit design, the first PWM-debugging, drivenby the drive circuit Finally, the transmission signal light.The curriculum design products as much as possible to achieve low powerconsumption, stable transmission, transmission rate characteristics.
Keywords: electromagnetic wave wireless communicationUnderwater optical communication Driving circuit design
目录
1绪论1
1.1研究背景1
1.2论文的主要内容1
2水下无线光通信光源选择2
2.1发光二极管（LED）的简介2
2.2发光二极管的选择3
3光通信发射机系统硬件的设计与实现5
3.1微处理器的选择5
3.2发射机硬件设计5
3.2.1USB输入端口电路.5
3.2.2降压稳压电路.6
3.2.3复位电路.6
3.2.4USB总线转接电路.6
3.2.5MSP430最小系统.7
3.2.6JTAG接口设计.8
3.2.7设计驱动电路.9
3.2.8总体设计原理图.9
3.2.9系统电路PCB图.9
4光通信接收机系统的软件开发10
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