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中文摘要：
当卫星导航信号受到一段时间干扰或遮蔽时,信号载噪比下降,传统跟踪环路失锁。信号恢复时,针对传统跟踪环路不能及时重新跟踪问题,应用矢量跟踪算法,进行跟踪。分析了在真实GPS数据加上仿真噪声之后矢量/频率锁定环路（VDFLL）的性能以及与传统环路进行对比,试验证明矢量跟踪具有快速重跟性能。
英文摘要：
Due to the presence of signals interference or blockage, the carrier noise ration （CNR） of the satellite navigation signals decreases and the traditional GPS receiver tracking loops lose lock. When the satellite signals recover, the traditional receiver tracking loops cannot retrack the signals rapidly, so vector-based tracking loops is adopted to solve the problem. The performance of vector dely/frequency lock loop （VDFLL） is analyzed using the real GPS data added the simulation noise. Test results show that the vector-based tracking loops have the advantages of better position accuracy and higher ro bustness over the traditional scalar loops.
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