【作者】 庞治华；

【导师】 易克初；

【作者基本信息】 西安电子科技大学 ， 通信与信息系统， 2002， 硕士

【摘要】 本文研究一种具有一定抗干扰能力的卫星通信系统，它是根据一项中国发明专利的思想、采用星上FDMA-CWTDM(频分多址—连续波时分复用)转换和扩频技术构成无中心网状网的一种卫星通信新体制。这种体制既能回避星上处理设备复杂度高、功耗大的难题，又能支持多种卫星通信业务，简化地面站设备，还能为卫星通信系统灵活地进行组网带来方便。 在深入研究星上FDMA-CWTDM转换新方法和学习扩频通信原理的基础上，结合具体的系统参数，本文提出了面向扩频通信卫星应用FDMA-CWTDM转换的解决方案，具体展开了以下几个方面的研究： 1．深入研究了多相阵列FFT分路算法，基于正交采样原理对算法进行了改进。提出了一种适于硬件实现的FFT分路模块解决方案。 2．结合实际系统提出了32路CWTDM模块的实现方案。针对CWTDM模块的关键问题一频偏对帧同步的影响，作了深入的理论分析和仿真，进而提出了实际系统的时分分接同步解决方法。 3．深入研究了支持FDMA-CWTDM转换的扩频通信系统，提出了支持该系统的扩频接收机的实现方案。 4．选择系统级动态仿真软件Elanix System View，对设计的系统进行了仿真，同时开发了许多专用和通用的控件，为基于FDMA-CWTDM转换的扩频通信系统的硬件实现打下了良好的基础。更多还原

【Abstract】 This thesis researches on a new scheme of satellite communication with anti-jamming ability, which is a system based on onboard FDMA-CWTDM (Continuous Wave Time Division Multiplex) conversion according to the idea of a Chinese patent and spread spectrum technique to constitute a mesh network. This scheme can not only avoid the challenging resulted from the complexity of on-board processing, but also support various services for satellite communications. Moreover, it is also convenient for networking.Researching in depth on the new method of on-board FDMA-CWTDM conversion and spread spectrum technique, and considering possible military demand, the thesis puts forward a practical design scheme applied to the satellite spread spectrum communication, and finish some work about the related details and implementation simulation as follows:1. Based on thorough studying of the Multiphase Array FFT De-multiplex Algorithm, the algorithm is improved by using the Orthogonal Sampling Principle, and further a implementation scheme which can benefit its hardware design is proposed.2. The practical sketch of CWTDM is brought forward in view of real instance. In research on de-multiplexing of CWTDM signals, the trouble resulted from frequency bias is studied in depth, thanking to which a synchronization module for De-CWTDM is advanced.3. Deeply studying the Spread Spectrum Communication Principle, the thesis designs a receiver scheme specially for this communication system.4. With a dynamic system design tool, System View by Elanix, many custom tokens for general and special usage is developed, which would be helpful to the hardware implementation of the research result.更多还原