基于多载波环融合的GPS高动态信号跟踪方法

摘要

To improve the accuracy and solve the problem of losing phase-ock when track GPS signal under high dynamic conditions, a new signal tracking method was raised. The integration multi - carrier ring tracking loop was constructed with phase-lock loop, frequency-lock loop, four-quadrant arctangent discriminator and phase-lock loop aiding with frequency-lock loop. In order to achieve a stable tracking, frequency and phase judgment factors were used when regulate the selection of tracking loop to update the local frequency generator. The simulation results show that the method can track a small loop noise bandwidth ultra-high dynamic GPS signal successfully with the acceleration of 150g, and can be effectively used in tracking GPS signal under high dynamic conditions.%研究全球定位系统(GPS)导航高动态接收跟踪信号精度优化问题,针对GPS在高动态环境下信号跟踪精度不高,并容易失锁的问题,提出了一种新的跟踪方法.基于锁相环,锁频环,四象限反正切鉴频器和锁频环辅助锁相环构建多载波环相融合的跟踪环,利用频率和相位判决因子,调整选用不同跟踪环更新本地载波频率发生器以实现稳定跟踪.仿真结果表明,提出的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150g的超高动态GPS信号,并在高动态环境下提高了GPS信号的跟踪精度,为多载波设计提供了参考依据.