卫星导航信号模拟器研究与实现
发布时间：2018-09-14 20:18
【摘要】：卫星导航信号模拟器能够根据载体的运动状况精确模拟出载体收到的导航信号。卫星信号模拟器可以对接收机的捕获、跟踪和测量精度进行测试，高动态接收机的测试更加依赖于模拟器。本文针对GPS导航信号模拟器在半实物闭环仿真系统中的应用，对系统平台总体架构、数学模型、信号模拟方法等多方面展开了深入细致的研究。 首先根据各卫星导航系统和导航信号体制的发展情况，总结了当前卫星导航信号模拟器国内外发展现状和趋势。根据GPS导航信号模拟器系统的卫星信号的结构、特性和信号模型，介绍了本模拟器的架构组成，详细说明了软硬件部分的功能构成、工作原理和实现方案。 而后分析了信号模拟器中的状态参数计算方法，着重研究了载体的姿态仿真技术，建立了载体姿态模型，给出载体姿态下卫星的可见性判断算法并进行了数学仿真，定性验证了算法的可行性，给出了天线方向图的模拟技术方案。 然后研究了多普勒频率合成方法，根据载波和码NCO的实现原理，介绍了多阶DDS模型，，给出了时变频率控制字的计算表达式并在多场景下进行了仿真，表明了其在高动态条件下的良好性能。 最后完成模拟器的硬件实现，实现了PCI接口和光纤模块的同步设计，并进行了导航信号质量和性能测试，验证了模拟器的实时闭环仿真能力。
[Abstract]:The satellite navigation signal simulator can accurately simulate the navigation signal received by the carrier according to the moving state of the carrier. The acquisition, tracking and measurement accuracy of the receiver can be tested by the satellite signal simulator, and the test of the high dynamic receiver is more dependent on the simulator. In this paper, aiming at the application of GPS navigation signal simulator in the loop simulation system, the overall architecture, mathematical model and signal simulation method of the system platform are studied in detail. Firstly, according to the development of satellite navigation system and navigation signal system, the current status and trend of satellite navigation signal simulator at home and abroad are summarized. According to the structure, characteristics and signal model of the GPS navigation signal simulator system, this paper introduces the architecture of the simulator, and explains the function composition, working principle and implementation scheme of the software and hardware parts in detail. Then, the calculation method of state parameters in signal simulator is analyzed, the attitude simulation technology of carrier is studied emphatically, the attitude model of carrier is established, the visibility judgment algorithm of satellite under carrier attitude is given, and the mathematical simulation is carried out. The feasibility of the algorithm is verified qualitatively, and the simulation scheme of antenna pattern is given. Then, the Doppler frequency synthesis method is studied. According to the realization principle of carrier and code NCO, the multi-order DDS model is introduced, and the expression of time-varying frequency control word is given and simulated in multi-scene. It is shown that it has good performance under high dynamic conditions. Finally, the hardware implementation of the simulator is completed, the synchronous design of PCI interface and fiber module is realized, and the quality and performance of navigation signal are tested, which verifies the real-time closed-loop simulation capability of the simulator.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN96.1
本文编号：2243769
[Abstract]:The satellite navigation signal simulator can accurately simulate the navigation signal received by the carrier according to the moving state of the carrier. The acquisition, tracking and measurement accuracy of the receiver can be tested by the satellite signal simulator, and the test of the high dynamic receiver is more dependent on the simulator. In this paper, aiming at the application of GPS navigation signal simulator in the loop simulation system, the overall architecture, mathematical model and signal simulation method of the system platform are studied in detail. Firstly, according to the development of satellite navigation system and navigation signal system, the current status and trend of satellite navigation signal simulator at home and abroad are summarized. According to the structure, characteristics and signal model of the GPS navigation signal simulator system, this paper introduces the architecture of the simulator, and explains the function composition, working principle and implementation scheme of the software and hardware parts in detail. Then, the calculation method of state parameters in signal simulator is analyzed, the attitude simulation technology of carrier is studied emphatically, the attitude model of carrier is established, the visibility judgment algorithm of satellite under carrier attitude is given, and the mathematical simulation is carried out. The feasibility of the algorithm is verified qualitatively, and the simulation scheme of antenna pattern is given. Then, the Doppler frequency synthesis method is studied. According to the realization principle of carrier and code NCO, the multi-order DDS model is introduced, and the expression of time-varying frequency control word is given and simulated in multi-scene. It is shown that it has good performance under high dynamic conditions. Finally, the hardware implementation of the simulator is completed, the synchronous design of PCI interface and fiber module is realized, and the quality and performance of navigation signal are tested, which verifies the real-time closed-loop simulation capability of the simulator.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN96.1
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