一种用于高动态环境的GPS信号跟踪方法

针对全球定位系统（GPS）在高动态环境下信号跟踪精度不高以及容易失锁的问题，提出一种新的跟踪方法.采用锁频环（FLL）和锁相环（PLL）相融合的跟踪方式，利用判决因子对当前的跟踪状态进行判定，根据判决值对FLL和PLL输出赋予相应的权值，调整其相对作用的大小，从而将FLL和PLL在同一跟踪过程中更好地融合.仿真结果表明，该方法在环路噪声带宽较小的情况下能够成功地跟踪加速度为150 g的超高动态GPS信号.

A Tracking Method for GPS Signal under High Dynamic Condition

To solve the problem of bad GPS tracking performance under high dynamic condition, a new tracking method integrated with frequency locked loop (FLL) and phase-locked loop (PLL) was proposed. A judge factor is employed to define the current tracking state. In order to regulate the relative contribution of FLL and PLL to the tracking process, the FLL and PLL outputs are given with different weights based on the judge factor. This weight adjustment can perform a better integration of FLL and PLL in the tracking process. The simulation results prove that the method can be used to track the GPS signal of 150 g acceleration with small noise bandwidth.