【作者】 余飞；

【导师】 董天临；

【作者基本信息】 华中科技大学 ， 电磁场与微波技术， 2007， 硕士

【摘要】 大功率的超低频电磁波技术是当今国际瞩目的一个新兴研究领域,在井下、水下通信系统、海洋、地震监测、核废料处理及环境保护等方面具有广泛应用前景。目前,我国对于超低频井下通信的研究还不太成熟。本文针对井下通信的实际需求,进行了井下通信系统的开发工作。鉴于传统低频无线通信系统中,电路元件过多过大、系统结构复杂以及硬件调试不便等诸多缺点,本文提出了以单片机的软件调制方式替代传统的硬件调制方式的做法,精简了系统结构,减少了电路元器件,并使整个通信系统的调试显得更为方便。整个超低频井下通信系统中包括了发射机、接收机及频率检测器三个部分,文中对这三个部分的功能及软件实现都进行了详尽的阐述。电磁波的发射频率范围为1～100Hz,使用数字脉宽调制方式(DPWM),这些工作都将由单片机软件编程完成。最后,本文对于系统软件的综合及调试进行了说明,并对整个超低频通信系统作了总结。更多还原

【Abstract】 The technique of large power super low frequency communication is attached great importance as a new research field in current international situation. It can be widely used in several kinds of circumstances, such as, communication systems under-well / underwater, sea / earthquake monitoring, nucleus scarp processing and environment protection application, etc.As a matter of fact, the under-well super low frequency communication is not very mature in our country. The research of the under-well super low frequency communication system is achieved in this thesis due to the practical needs of the under-well communication. Since there are many shortcomings in the traditional low - frequency wireless communication systems such as excessive circuit components, system complexity and inconvenience of hardware debugging, this thesis presents a new approach that using Single - Chip Microprocessor (SCM) software modulation instead of the traditional hardware modulation to reduce circuit components and simplify the system structure. In this system, the emission frequency range of electromagnetic wave is between 1Hz and 100Hz using digital pulse width modulation (DPWM). All these efforts will be completed by SCM software programming.In all, the method is characterized by simple structure, collecting components easily and low cost. And it provides a model for the designing work of a communication system in super-low frequency.更多还原