Doppler differential value weighted cycle slip detection and recovery

The present paper proposes a Doppler differential value-weighted real-time BDS cycle slip detection method. This approach represents a novel utilization of Doppler values for the detection of cycle slip. The phase-Doppler (PD) combination method is employed to derive the cycle slip test quantity. A single epoch differential is applied to this test quantity in order to mitigate systematic errors, while epoch-based Doppler differential values are utilized to construct weighting coefficients. The coefficients facilitate the implementation of adaptive weighting and adjustment of both the test quantity and decision threshold. In order to eliminate blind zones in cycle slip detection, this paper combines the improved PD and GF methods. A threshold correction strategy is introduced within a sliding window recursive framework with a view to reducing false negatives and zero bias. The experimental results demonstrate that this approach significantly suppresses the impact of systematic errors on the test quantity, reduces false alarm rates, and successfully detects and corrects insensitive cycle slips that are prone to being missed by traditional methods. This is achieved through the complementary nature of the two combined approaches.