A Cycle slip Detection Method Based on Single-frequency Dual-mode

Abstract

Cycle slip detection is an important part of quality control of RTK (real-time kinematics). The occurrence of cycle slips will cause the pseudorange or carrier phase to jump, making the positioning accuracy centimeter-level or even decimeter-level errors, which cannot meet the requirements of high-precision positioning. In this paper, an improved pseudorange-carrier phase combination cycle slip detection method based on single frequency receiver is proposed to deals with the problem of small cycle slip. The proposed method uses integral doppler observations to smooth the pseudo-range observations, and predicts the cycle slip constructed by the traditional pseudo-range phase combination method through the gray Verhulst Markov dynamic model. Numerical experiments show that the cycle slip detection value with an amplitude 2 times larger than the threshold are successfully identified when the cycle slip is as small as one week. This means that the proposed method can effectively detect small cycle slip.