基于GT的钟差预测模型辅助GPS定位算法研究

摘要

When the signal of GPS satellites is blocked ,GPS receiver can’t calculate its position .In order to obtain positioning results of GPS receiver under bad conditions ,a new model for predicting receiver clock bias based on grey theory is presented .The basic ideas and steps of this model are discussed respectively . 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 date show this model has better predictive power for the series of receiver clock bias .Under the condition of only three GPS satellites ,this model can implement 3D position .%为了解决在强干扰环境下由于GPS卫星信号被遮挡而无法定位的问题，从灰色理论（GT ）的角度探讨了接收机的钟差序列，提出一种利用灰色理论的钟差预测模型辅助GPS定位的方法。对预测模型的基本思想和具体实现步骤作了详细的介绍，并且将钟差预测值引入到GPS接收机中，实现信号遮挡情况下GPS接收机的定位解算。通过对实测数据的验证分析表明，该钟差预测模型对钟差序列有很好的预测效果，能够在仅有3颗可观测卫星的情况下实现接收机的定位解算。