中文摘要：

热噪声颤动与动态应力误差作为GPS接收机跟踪环路两个主要测量误差源，二者数值的大小分别反映了环路的抗干扰能力与动态性能。为了改善GPS接收机跟踪环路在高动态、强干扰环境下的跟踪性能，首先对热噪声颤动与动态应力误差的影响因素进行了深入的分析，进而提出一种自适应跟踪环路的设计方案。该方案基于最小化测量误差的原则，根据所检测的载体动态与信号载噪比对环路的阶数与带宽进行调节，可使环路在不同工作环境下兼顾动态性与抗干扰性的要求，从而不仅提高了环路的测量精度，同时又保证了环路的稳定性。仿真结果表明：与传统跟踪环路相比，所设计的跟踪环路通过自适应调节阶数与带宽，有效地改善了对GPS信号的动态跟踪能力和抗干扰性能。

英文摘要：

As the two dominant sources of measurement errors, thermal noise vibration and dynamic stress error reflect the anti-jamming capability and dynamic tracking performance of GPS receiver tracking loop respectively. In order to improve the tracking performance in both high dynamic and strong interfer- ence conditions, thermal noise vibration and dynamic stress error are deeply analyzed firstly, and then the design scheme of an adaptive tracking loop is proposed. On the principle of minimizing the measurement errors, this scheme utilizes the detected line-of-sight dynamic and carrier-to-noise power density ratio to a- daptively adjust the loop order and bandwidth, which can simultaneously give attention to the thermal noise vibration and the dynamic stress error. Thus the loop measurement accuracy is improved, and the tracking stability is guaranteed. Finally, the simulations results show that this adaptive tracking loop can significantly improve the anti-jamming capability and the dynamic tracking performance by adjusting the loop order and bandwidth.