A Multi-cycle Slip Detection and Repair Method for Single-Frequency GNSS Receiver
Objectives:With the rapid popularization of low-cost receivers,single-frequency global naviga-tion satellite system(GNSS)is now widely used.The cycle slip rate of a single-frequency GNSS receiver is commonly high in a complex situation.Although geometry-free(GF)model can detect some large cycle slips,it is not sensitive to small cycle slips.The geometry-based(GB)model is efficient for cycle slip detec-tion and repair,but its success rate of detection descends correspondingly with an excessive number of ab-normal satellites.Methods:By combining the advantages of GF and GB models,this paper proposes a new cycle slip detection and repair method.The proposed method firstly detects and rejects the abnormal satel-lites with large cycle slips by GF model,then uses GB model to detect small cycle slips and repair large cy-cle slips.Results:The results show that the proposed cycle slip detection and repair method can enhance the success rate if many cycle slips occur simultaneously.The success rate can be improved by approximate-ly 50%even when the abnormal satellites reach the half or more of total numbers simultaneously.Conclu-sions:Compared with the traditional GB model,the proposed GF+GB model can take advantage of each model to improve the performance when multi-cycles occur.
single frequency observationcycle slip detection and repairgeometry-free modelgeome-try-based model