GPS观测数据的建模与仿真

Modeling and Simulation of GPS Observation Data

在研究GPS系统的基础上建立了GPS观测数据的仿真模型,编制了相应的计算机程序。仿真模型包括卫星参数模型、动力学模型和观测误差模型。仿真计算表明,卫星参数模型和动力学模型真实地反映了卫星的运动规律;误差模型反映了观测环境对信号传播的影响。同时可以调节和选择仿真模型的参数,仿真选择了地面静态和地面低动态的观测数据,这对于论证GPS定轨、导航算法、设计GPS接收机等有一定的实用价值。

On the basis of deep investigation on GPS, simulated models of observation data are built. The models include GPS satellite model, dynamical model and observation error models. The programs of realizing simulation process are compiled and the simulated results show that simulated models are proper. The values of simulate model parameters can be modulated randomly in order to simulate observation data of the static GPS data and the ground-based lower kinetic GPS data. The simulated models and methods in this article can be used in the process of evaluating orbit determination, navigation algorithm and developing GPS receiver.