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针对卫星导航用户观测数据模拟具有高精度、高采样率、强实时性的要求,该文在研究卫星导航定位系统工作原理的基础上,建立了卫星导航用户观测数据实时模拟系统。详细论述了卫星导航用户观测数据模拟的原理、流程及所用到的数学模型。考虑到观测数据模拟的时间约束特性,将模拟系统划分为非实时层、弱实时层和强实时层3层结构,并采用多线程的处理方法。模拟算例结果表明:该系统具有正确性和可靠性,满足强实时性要求,适用于卫星导航用户观测数据模拟。
Aimed at the requirements of satellite navigation user observation data simulation with high accuracy, high sampling rate and strong real-time performance, this paper establishes a real-time simulation system of satellite navigation user observation data based on the study of the working principle of satellite navigation and positioning system. The principle, process and mathematical model of satellite navigation user observation data simulation are discussed in detail. Considering the time constraint of the observed data, the simulation system is divided into three layers: non-real-time layer, weak real-time layer and strong real-time layer, and the multi-thread processing method is adopted. Simulation results show that the system is correct and reliable, meets the strong real-time requirements and is suitable for satellite navigation user observation data simulation.