高动态环境会造成较大的多普勒频移，这使得一般的GPS接收机在没有外界辅助的情况下难以可靠工作。为了同时满足高动态GPS接收机动态性能和噪声抑制两方面的需要，GPS/INS紧耦合系统利用INS的信息辅助GPS接收机的载波跟踪回路。对紧耦合系统的关键技术——INS辅助GPS载波跟踪回路进行了系统分析，阐述了INS信息辅助GPS载波跟踪回路的详细原理。由于在该紧耦合系统中，动态信号和相位噪声分别作用于不同的传递函数，动态信号环路带宽大大高于相位噪声的环路带宽，从而使跟踪环路既能很好响应高动态信号又能有效抑制噪声，提高了载波跟踪环的跟踪性能与抗干扰能力。

High dynamic environment may cause a large Doppler shift,thus the general GPS receiver is difficult to work reliably without outside assistance.In order to meet both the dynamic performance and noise suppression needs of GPS receiver in high dynamic environment,the tightly coupled system of GPS/INS using INS information to assist carrier tracking loop of GPS receiver was proposed.The critical technologies of INSaided GPS carrier tracking loop were analyzed along with its detailed working principle.In the tightly coupled system,the dynamic signal and phase noise were imposed on different transfer functions,thus the dynamic signals bandwidth was much higher than that of phase noise.Therefore,the tracking loop can have not only a very good response to the high dynamic signal but also an effective noise suppression，the tracking performance and antijamming capability of the carrier tracking loop are also improved.