GNSS数字中频信号源的软件设计
发布时间：2018-08-09 11:16
【摘要】：软件GNSS（Global Navigation Satellite System）数字中频信号模拟器用于模拟产生多星座多信号体制的卫星导航信号，为卫星导航系统的仿真和接收机的测试提供一种高效的工具，对我国建立和发展自主的卫星导航系统有非常重要的现实意义。 本文对软件GNSS数字中频信号模拟器的部分的关键技术进行了深入研究，采取模型算法研究和系统具体实现相结合的方法。 首先，在卫星定位的原理基础上、建立了系统的信号模型和确定了GNSS中频信号产生系统实现方案。本论文以给出的实现方案为主线对GNSS中频信号源的设计逐步展开。 其次，详细介绍了软件GNSS中频信号源的具体实现方法，包括交互界面的设计、生成导航电文、从导航电文中读取卫星参数，对卫星的可见性进行判断。 再次，，重点分析了系统的误差模型并将这些误差引起的伪距误差加入系统的基带信号中使信号源的信号更能真实地模拟现实世界的场景。 最后，对基带信号实现扩频调制、载波调制、合路输出数字中频信号，并对产生的中频信号通过与软件接收机闭环测试的方法验证准确性并分析结果。
[Abstract]:The software GNSS (Global Navigation Satellite System) digital if signal simulator is used to simulate and generate multi-constellation and multi-signal satellite navigation signal, which provides an efficient tool for the simulation of satellite navigation system and the testing of receiver. It is very important to establish and develop autonomous satellite navigation system in China. In this paper, the key technologies of the software GNSS digital if signal simulator are deeply studied, and the method of combining the model algorithm with the system implementation is adopted. Firstly, based on the principle of satellite positioning, the signal model of the system and the realization scheme of GNSS if signal generation system are established. In this paper, the design of GNSS intermediate frequency signal source is developed step by taking the given implementation scheme as the main line. Secondly, the realization method of software GNSS intermediate frequency signal source is introduced in detail, including the design of interactive interface, the generation of navigation message, the reading of satellite parameters from the navigation message, and the judgment of satellite visibility. Thirdly, the error model of the system is analyzed and the pseudo-range error caused by these errors is added to the baseband signal of the system so that the signal of the signal source can simulate the scene of the real world more truthfully. Finally, spread spectrum modulation, carrier modulation and digital intermediate frequency signal are output for baseband signal. The accuracy of the generated if signal is verified by closed loop test with software receiver and the results are analyzed.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4
[Abstract]:The software GNSS (Global Navigation Satellite System) digital if signal simulator is used to simulate and generate multi-constellation and multi-signal satellite navigation signal, which provides an efficient tool for the simulation of satellite navigation system and the testing of receiver. It is very important to establish and develop autonomous satellite navigation system in China. In this paper, the key technologies of the software GNSS digital if signal simulator are deeply studied, and the method of combining the model algorithm with the system implementation is adopted. Firstly, based on the principle of satellite positioning, the signal model of the system and the realization scheme of GNSS if signal generation system are established. In this paper, the design of GNSS intermediate frequency signal source is developed step by taking the given implementation scheme as the main line. Secondly, the realization method of software GNSS intermediate frequency signal source is introduced in detail, including the design of interactive interface, the generation of navigation message, the reading of satellite parameters from the navigation message, and the judgment of satellite visibility. Thirdly, the error model of the system is analyzed and the pseudo-range error caused by these errors is added to the baseband signal of the system so that the signal of the signal source can simulate the scene of the real world more truthfully. Finally, spread spectrum modulation, carrier modulation and digital intermediate frequency signal are output for baseband signal. The accuracy of the generated if signal is verified by closed loop test with software receiver and the results are analyzed.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4
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