GPS不完整星座定位方法研究

Research on Positioning Method under GPS Incomplete Constellation

为了提高钟差预测模型辅助接收机定位解算的效果,从灰色系统的角度对接收机钟差序列进行探讨,提出了基于灰色理论的钟差预测模型。文中首先给出了新模型的基本思想和具体实现步骤,然后将基于该模型的钟差预测值引入到GPS接收机中,辅助接收机在不完整星座条件下实现定位解算。基于GPS实测数据的验证分析表明,新模型不仅对钟差序列具有很好的预测效果;而且提高了接收机定位的连续性和可靠性,在仅有3颗卫星的条件下可以实现三维定位。同时,新方法无需增加额外设备,辅助方式简单方便,经济灵活。

In order to augment the performance of GPS receiver positioning calculation aided by clock bias prediction model,a new model for predicting receiver clock bias based on grey theory is presented in this paper.The basic ideas and steps of the forecasting model are discussed respectively.And then this model is introduced to aid the GPS receiver to calculate its position under the incomplete constellation.The validation and analysis based on the real GPS data show that this model not only has better predictive power for the series of receiver clock bias,but also improves the continuity and reliability of receiver positioning calculation.Under the condition of only three GPS satellites,this augmented positioning method can implement 3-D position.Meanwhile,this method does not need extra equipments,and it＇s much more convenient,feasible and effective.