基于卫星定位技术的动态定位系统设计及试验研究

【作者】 庞娇妮；

【导师】 李豪杰；

【作者基本信息】 南京理工大学 ， 机械电子工程， 2008， 硕士

【摘要】 高精度的精准打击武器在现代战争中备受关注,具有卫星定位功能的引信已成为各国军事研究的热点,但目前卫星定位接收设备在高动态环境下捕获卫星信号和处理定位数据的实时性仍无法得到满足。在介绍了卫星定位系统的国内外发展和应用情况的基础上,对卫星定位技术在引信中的应用途径进行了分类和概括,分析了卫星定位系统应用于引信存在的主要技术难点并提出了解决的途径和方法。通过对卫星定位系统快速定位需求、启动过程和关键技术指标的分析,提出了高动态下快速定位方案,重点设计了外部处理模块辅助系统和A-GPS辅助系统的总体方案、系统结构和工作过程,并在理论上对启动速度进行了计算。针对卫星定位系统应用于引信需要对弹道数据进行实时高复杂度处理,进行了以DSP作为数据处理核心的高动态定位系统设计,对系统各模块进行了器件选型、结构设计以及硬件电路设计,并用汇编、C/C++语言进行了软件设计,包括系统初始化,存储器配置,接收和提取定位信息,数值转换以及对弹道定位数据的坐标转换和断点补充。本文以DSP入门套件(DSK)作为数据平台以及仿真器作为仿真工具,通过CCS仿真环境对系统各硬件模块和软件程序进行调试和检验,实现了实时定位数据处理功能。进行了A-GPS辅助启动、无辅助冷启动及失锁重捕定位时间的测试和比较,并进行了静态和准动态下的系统实验,通过MATLAB软件对实验数据进行仿真并以计算圆概率半径分析了定位精度,所设计的坐标转换和断点补充功能算法在试验中得到了验证。更多还原

【Abstract】 The high-precision weapons for accurate attack are getting more and more attention in the modern war. The development of fuzes which have the function of satellite positioning has become a hotspot in the military research. However, the real-time performance of the satellite positioning system to capture the satellite signals and process the positioning data in the high-dynamic environment is still not satisfied today.Based on the brief introduction of the development and the application of the satellite positioning system over the world, the applications of the satellite positioning system in fuzes are classified and summarized. The technical difficulties existing in these applications are analyzed and the possible solutions are proposed. According to the analysis of the needs of the quick start-up, the starting process, the key technical indicators and the scheme of quick start-up in the high-dynamic environment are proposed. Among above, the working principle of the external processing modules assisted system and A-GPS system are designed, the starting speed of which is calculated in the theory.The satellite positioning system under high-dynamic state is designed by using DSP as the data processing core in the light of the real-time trajectory data needed to be processed complicatedly. What’s more, the components of the module are selected, and the configuration as well as the circuit for the module is also designed. Using assembly and C/C++ language, some functions are realized, which including the system initialization, the memory configuration, the reception and extraction of the positioning signals, the numerical conversion, the coordinate transformation and the breakpoint supplement for the trajectory positioning data.The system is debugged and tested by DSK and a simulator in CCS to realize the function of real-time data processing. Further more, the starting time of A-GPS, non-assisted cold start and lock-lose information reacquisition are tested and compared. The experiments are carried out in the condition of tatic state and quasi-dynamic state respectively, and the simulation is made to analyze the magnitude using MATLAB. The experimental results show that the algorithm designed for the coordinate transformation and breakpoint supplement is proved to be implemented.更多还原