一种适用于单频GNSS数据的多周跳探测与修复方法

A Multi-cycle Slip Detection and Repair Method for Single-Frequency GNSS Receiver

随着低成本接收机的广泛使用,单频GNSS(global navigation satellite system)已成为主要应用场景之一。单站单频GNSS通常由于观测环境较为复杂,其周跳率往往较高。虽然传统的无几何(geometry-free,GF)组合可探测部分大周跳,但对小周跳不敏感;几何(geometry-based,GB)组合可有效解决该问题,但在多个周跳同时发生时,GB组合的探测成功率会大幅下降。因此,提出了一种将GF组合与GB组合相结合的周跳探测修复方法。首先利用GF组合将大周跳探测并剔除,然后采用GB周跳探测方法探测小周跳,并在选权迭代的过程中不断修复发生大周跳的观测值。实验结果表明,所提方法可有效提高多周跳发生时的探测修复率,在极端情况下与传统方法相比成功率可提高约50%。

Objectives:With the rapid popularization of low-cost receivers,single-frequency global navigation 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 detection and repair,but its success rate of detection descends correspondingly with an excessive number of abnormal 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 satellites with large cycle slips by GF model,then uses GB model to detect small cycle slips and repair large cycle 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 approximately 50% even when the abnormal satellites reach the half or more of total numbers simultaneously.Conclusions: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.