恶劣环境下GPS接收机定位算法研究

Research on GPS receiver positioning algorithm under bad conditions

为了解决在恶劣环境下卫星信号被遮挡时GPS接收机无法定位的问题,将接收机钟差等效为可见卫星,并根据钟差预测值辅助GPS接收机进行定位解算。提出了基于时间序列分析理论的接收机钟差组合预测模型,然后将钟差预测值引入到GPS接收机中,通过扩充观测方程以实现接收机三维定位解算功能。分别在静态以及动态情况下应用实测数据进行验证,结果表明:该模型适合于钟差序列预测;在仅有3颗卫星的恶劣环境下,该方法可以提供满足导航定位精度要求的GPS接收机三维定位信息。

When the signals of GPS satellites are blocked, GPS receiver cannot calculate its position. In order to ob- tain positioning results of GPS receiver under bad conditions, the series of receiver clock bias is regarded as a visible satellite and utilized to augment GPS receiver for positioning calculation. A combined model for predicting receiver clock bias based on the theory of time series analysis is presented in this paper. And then the predicted value ob- tained from the model is introduced into GPS receiver to implement the function of positioning calculation. Actual test data were used to verify the method under both static and dynamic conditions. Experimental results demonstrate that the prediction model in this paper is suitable for predicting receiver clock bias, and the proposed positioning method can implement a good estimation of three-dimensional position under the condition where only three satellites are available.