Cycle Slip Detection and Repair Method for Dual-Frequency Ionosphere-Free Combination and MW Combination Assisted by INS

A method for cycle slip detection and repair is proposed in this study to address the issue of integer cycle ambiguity fluctuations caused by multiple factors in satellite navigation systems. By integrating the high-precision short-term position information from an INS (Inertial Navigation System) with precise ephemeris data, the method establishes differenced ionosphere-free combination observables and MW combination observables between satellites and epochs. By leveraging the advantages of both observables, this approach effectively mitigates the effects of ionospheric delay, tropospheric delay, and hardware errors, enabling accurate detection and repair of cycle slip. Experimental results demonstrate that the proposed method achieves precise detection and repair of large cycle slip, small cycle slip, equal dual-frequency cycle slip, and special ratio cycle slip, significantly enhancing the accuracy and efficiency of cycle slip detection. This highlights the potential and promising applications of INS-assisted satellite navigation systems in complex environments.