【作者】 张翼；

【导师】 王淑钧；

【作者基本信息】 哈尔滨工程大学 ， 通信与信息系统， 2004， 硕士

【摘要】 陆基无线电导航通信系统主要实现对舰船的导航定位功能，它是一种远程高精度的无线电导航系统，同时也是一个非常实用的扩频通信系统。它具有作用距离远、定位精度高、稳定性好等优点。因此，它的投入使用将会为我国提供宝贵的导航定位资源。 本课题是“陆基无线电导航通信系统信号模拟器的研究”。它研究发射机发射出来，经过有噪信道传播的电波信号。具体的说它研究路基导航通信系统发射部分各环节的信号以及该信号在空间的传播。在电波传播部分的研究中，我们探讨了发射信号的天波、地波传播方式，并详细说明了单位发射功率、一定作用距离时，两种方式下信号场强的计算方法，然后利用计算的场强值，设计了发射机所需的发射功率。接着，在信号模拟器的软件仿真中，我们应用MATLAB对系统发射部分各环节的信号进行了仿真；重点探讨了噪声的仿真方法，并仿真出几种常见分布的噪声；为了演示上述仿真结果，我们采用VC++调用MATLAB的方法实现了信号仿真演示，本文详细介绍了这种方法。最后，我们讨论了用硬件实现了这个信号模拟器的方法。该系统是利用DSP(TMS320C5410)和CPLD(EPM7128)作为硬件平台的。本文给出重点部分硬件电路图，同时给出了与硬件配合工作的软件流程图。更多还原

【Abstract】 The communication system of land-based wireless navigation can supply the information for ship. This information is very important for the navigation and location of ship. On the whole, this system is a long-distance, high-precision wireless navigation system. At the same time, it is a very useful spread spectrum communication system. This system has much advantage, such as long-distance, high-precision, good-stability. Therefore, it can provide the valuable resource for the navigation and the location of ship.The title of my paper is "The research of Simulator On the communication system of land-based wireless Navigation". This paper mainly discusses the signal emitted by the transmitter and the propagation of the signal. In the research of propagation of electric wave, we discuss the propagation modes of ground wave and sky wave. In these two kinds of modes, we discuss the calculation of field intensity with the condition of one unit power, a certain distance. We use the result of field intensity to design the power of transmitter. In the simulation of the signal, we simulate the signals of each part of the transmitter. Meanwhile, we focus on the simulation of noise and get the simulation results of several kinds of noise with common probability distribution. At the end of this part, we use the method of VC++ calling MATLAB to realize the simulation demo. At the last part of this paper, we discuss the hardware realization of the simulator. TMS320C5410 DSP and EPM718 CPLD are used as the hardware platform. The flow charts of software fitting for the hardware are also presented in the paper.更多还原