接收机温启动状态下辅助长码快捕的钟差预测算法

卫星导航接收机中,时间是影响长码快捕实现的重要因素。接收机钟差预测是压缩码相位不确定范围,减少信号搜索范围的一个方面。提出利用递推阻尼最小二乘法进行二阶钟差模型参数在线解算,并在温启动状态下利用存储的这些参数进行钟差预测的算法。以一款温补晶振为例进行了实验验证,数值结果表明该算法可以将钟差误差范围压缩6倍,将有效地辅助长码快捕的实现。

Clock bias forecasting algorithm for assisting the acquisition of long cycle PRN code at receiver's warm start

In satellite navigation receivers,time is an important factor which influences the fast and direct acquisition of long cycle and high rate PRN code.By forecasting the receiver's clock bias,the uncertainty range of code phase can be compressed and the range in signal searching can be reduced.So algorithm of forecasting the clock bias is proposed,which need to calculate the model pa- rameters of 2 ranks by RDLS on line.Then at the time of warm start,the clock bias can be forecasted using the parameters.The algo- rithm is validated by the experiment which taking one type TCXO as an example.And the numerical results indicate that the proposed algorithm can reduce the error range of clock bias to about twentieth,which have remarkable effect in the acquisition of long cycle PRN code.