Abstract: BDS-3 is providing the high-precision location-based services. However, due to the impacts of the complicated application environments of users side, the high-quality services of BDS-3 constellation are confronted with challenges. To improve the observation quality control model based on the cycle slip detection solution, a cycle slip detection model of BDS-3 frequency-wide observations is proposed, where the multi-frequency BDS-3 observations are fully used. Firstly, the cycle slip detection values of the epoch-difference phase are constructed by the combinations of the multi-frequency geometry-free(GF) equations. Then, the geometry-based(GB) equations of multi-frequency code and phase observations are used to construct the wide-lane ambiguity of cycle slip detection values. Finally, a method to estimate the model coefficients of the multi-frequency combination models are proposed based the least square algorithm. According to the observations of the static stations and vehicle onboard, it is indicated that a variety of linearly independent cycle slip detection can be obtained by taking the full frequency of BDS-3 into account. Meanwhile, the proposed model can fully utilize the BDS-3 multi-frequency observations to detect the cycle slip. Therefore, It is of great significance to perfect the quality control model and realize the innovative application of BDS-3 based on the proposed method.

Key words: BDS-3, cycleslip detection, frequency-wide observations, multi-frequency linear combination, least square