【作者】 魏玉阔；

【导师】 李海森；

【作者基本信息】 哈尔滨工程大学 ， 信号与信息处理， 2007， 硕士

【摘要】 随着电子技术的发展，高精度时间同步系统越来越在通信、深空探测、国防等高精尖技术领域得到广泛的应用。全球定位系统(GPS)由于具有可全球性全天时全天候覆盖的信号以及它搭载了可作为时频标准的高稳高准原子钟这两大优点，从而易于实现高精度低成本的时间同步系统。本文首先综述了研究时统设备的意义、时统设备的应用和发展现状，然后介绍了GPS系统的组成和授时原理，分析了采用GPS授时系统作为时间同步基准的优势。在此基础上设计了一套基于GPS和DSP的高对时精度和高守时精度的具备信号产生、数据采集和数据处理的功能的嵌入式时统控制及信号处理板。本文完成了系统的总体设计和硬件平台的实现及调试，完成了系统部分软件的开发，主要包括PCI设备在WINDOWS2000下的驱动程序、VC++6.0环境下主控应用程序、DSP的Bootloader程序及部分DSP程序的开发。本文完成了QuartusⅡ环境下利用VHDL语言实现高精度对时功能和守时功能的逻辑程序编写。分析了GPS信号的有效性、稳定性对时间同步精度的影响，并提出了修正方法；研究了利用GPS秒脉冲和高稳定晶体精度互补的特点和统计学的原理精确测量晶体时钟频率的方法，有效的提高了系统的时间同步精度和GPS信号失效后系统的自守时精度。实现了时统控制和信号处理板卡高精度时间同步和守时功能，并成功应用于某被动测距声纳的校准系统中。更多还原

【Abstract】 With the development of the electronic technic, high accuracy synchronous time system has been more and more widespread used in many fields such as communications, deep-space exploration and national defence. We can easily use Global Positioning System(GPS) to make up high-precision and low-cost synchronization time system because it has high stability and precision atom standard and it’s signal can wholly cover theearth at any time and at any weather.Firstly,the meaning of research, state-of-the-art and the applications of synchronous time equipment are summarized;then, the component and time service principle of the GPS system are introduced,the predominance of GPS in using for synchronous time system is analyzed.A embedded high accuracy synchronous time control and signal processing circuit board based on GPS and DSP is designed,which can be used for signal generating,data acquisition and data processing.The overrall design of the system and the realization of hardware platform are finished in this thesis .The development of some software is introduced, including the drivers of hardware in Win2000, the bootloader and application programs of DSP. Besides, the main control application program is developed in VC++6.0.The logical programing which realizes high accuracy synchronous time and high accuracy timekeeping is completed in Quartus II with VHDL language.The effect of the GPS signal’s availability and stability on synchronous time precision is analyzed,and the correction methods are pionted out. This thesis presents a new method to measure the frequency of the crystal oscillator clock accurately, which is based on both the complement of the errors between GPS and crystal oscillator and statistics theory.The method has increased the synchronous time precision and timekeeping precision of the system availability. High accuracy synchronous time and timekeeping function of the synchronous time control and singal processing board have been realized.The board has been used in the correction system of a passive ranging sona successfully.更多还原