GPS选择可用性(SA)信号采集与建模

GPS SA SIGNAL COLLECTING & MODELING

分析了ＧＰＳ测量伪距的各组成部分，设计了一个ＧＰＳ数据实时采集系统，通过定位计算和时钟偏移滤波的方法分离ＳＡ误差信号，经检验指出ＳＡ误差信号基本是零均值的平稳随机过程，对一段时期定点观测到的ＳＡ误差信号进行ＡＲ（１３）的模型辨识，获得大量的模型数据，从时域和频域对模型参数进行分析得到一些有益的结论。

Components of observed GPS pseudo range are analysed.A real time data collection system is designed.SA error signal is extracted by positioning computation and filtering clock bias.Testing result points out that the SA error is basically a stationary stochastic process with zero mean.AR(13) model is identified for SA error with the data collected in a fixed location during a period of time, and then a great deal of the model parameters are obtained. Some useful conclusions are derived by analysis of model parameters in the time domain and frequency domain.