GPS同步高速数据采集技术研究

发布时间：2018-11-16 20:40

【摘要】：在分布式靶场测试领域,高精度的时间同步以及高速的数据采集与传输对瞬态信号的测量是至关重要的。为了解决分布式靶场测试系统的时间同步问题,提高数据采集系统的数据采集速率,满足分布式天幕靶测试系统的工程需求,研制了一种高精度的同步数据采集系统。本文深入分析了广阔地域分布环境中天幕靶测时系统对数据采集的特殊需求,针对各个天幕靶设备的时间同步性以及高数据采集速率等难题,采用高速单片机技术、可编程逻辑器件技术及高速串行数据采集技术,结合GPS时间同步技术设计了一款专用高速数据采集系统。详细介绍了分布式同步数据采集设备的工作原理,讨论了运用高精确度GPS秒脉冲与高稳定本地晶振时钟相结合的途径,实现数据采集系统中各个模块之间的时间同步性。说明了系统设计中的关键问题以及解决方法,并对其中的核心机制“时间标签”的原理及实现方法进行了深入阐述。运用GPS时间同步与高速AD相结合的方式,实现了AD数据采集中准确的记录触发信号的到来时刻,使得精确的GPS时间数据与AD数据建立时间上的关联。实验结果表明,采用GPS授时技术提高了分布式靶场测试系统的测试精度及可靠性,该测试系统的同步实测精度可达到微秒级,采集功能可靠,满足了系统的技术指标。充分证明了方案的可行性与可靠性。
[Abstract]:In the field of distributed range testing, high precision time synchronization and high speed data acquisition and transmission are very important for transient signal measurement. In order to solve the time synchronization problem of the distributed range test system, improve the data acquisition rate of the data acquisition system and meet the engineering requirements of the distributed skyscreen target test system, a high precision synchronous data acquisition system is developed. In this paper, the special demand for data acquisition in the sky target time measurement system in the wide geographical distribution environment is deeply analyzed. Aiming at the problems of time synchronism and high data acquisition rate of each sky screen target equipment, the high speed single-chip computer technology is adopted. A special high speed data acquisition system is designed based on programmable logic device technology and high speed serial data acquisition technology combined with GPS time synchronization technology. The working principle of distributed synchronous data acquisition equipment is introduced in detail. The way of combining high precision GPS second pulse with high stability local crystal oscillator clock is discussed to realize the time synchronization among different modules in the data acquisition system. The key problems and solutions in the system design are explained, and the principle and implementation method of the core mechanism "time label" are expounded. Using the combination of GPS time synchronization and high speed AD, the arrival time of trigger signal in AD data acquisition is realized, which makes the accurate GPS time data and AD data establish time correlation. The experimental results show that the measurement accuracy and reliability of the distributed range testing system are improved by using GPS timing technology. The synchronous measurement accuracy of the system can reach the microsecond level, and the acquisition function is reliable, which meets the technical specifications of the system. The feasibility and reliability of the scheme are fully proved.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4;TJ06

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