GPS软件接收机跟踪算法研究

Research of Tracking Algorithm for GPS Software Receiver

全球定位系统(GPS)软件接收机被广泛应用于卫星信号的精确定位。在接收机跟踪算法中,载波跟踪环路采用了Costas环,以保证对180度相位翻转不敏感;码跟踪环路采用了性能良好的归一化超前减滞后码相位鉴别器,以确保对信号的准确跟踪。最后提出了窄相关技术,在噪声和多径干扰条件下能够有效降低码跟踪误差。

In order to realized the software receiver of global positioning system （GPS） for precise positioning of the satel-lite signal ,in the tracking algorithm ,carrier tracking loop using the Costas ring ,which is not sensitive to the 180 degree phase flip ,code tracking loop using the good performance of the normalized early-delaycode phase discriminator ,ensured to accurate tracking the signal .Finally ,Introduced the narrow correlator technology ,which can effectively reduce the code tracking error in noise and multipath interference conditions .