星载GPS低轨卫星跟踪数据的建模与仿真

在研究星载GPS低轨卫星系统的基础上，建立了星载GPS低轨卫星跟踪数据的仿真模型，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的传播影响。同时可以调节和选择仿真模型的参数，仿真采用不同高度、具有不同星体参数的低轨卫星和具有不同误差大小的跟踪数据，这对于论证星载GPS定轨方案、评价定轨算法、设计GPS接收机等有一定的实用价值。

Modelling and Simulation of Tracing Data of LOW-ORBIT Satellites Based on GPS

On the basis of deep investigation on the system of low-earth satellites based on GPS, simulated models of tracing data are built. The models include low-orbit satellite model, GPS satellite model, dynamical model and observation error models. The programs of realizing simulation process are compiled and simulated results show that simulated models are proper. The values of simulated model parameters can be modulated randomly in order to simulate low-orbit satellites at different altitudes and tracing data with different errors. The simulated models and methods in this article can be used in the process of investigating orbit determination scheme, evaluating orbit determination methods and developing GPS receiver.