2019 Meas.Sci.Tech: Unmodeled error mitigation for single-frequency multi-GNSS precise positioning based on multi-epoch partial parameterizationZhang Zhetao, Li BofengIn global navigation satellite system (GNSS) precise positioning, some residual systematic errors inevitably exist in GNSS observations. These residual systematic errors can be regarded as the unmodeled errors that canno...
2019 GPS Solut: Inter-system and inter-frequency code biases: simultaneous estimation, daily stability and applications in multi-GNSS single-frequency precise point positioningZang Nan, Li Bofeng, Nie Liangwei, Shen YunzhongBoth inter-system and inter-frequency code biases (ISCB and IFCB) embodied in the multi-GNSS single-frequency precise point positioning (MSFPPP) exhibit mainly as ...
2019 J Geod: Single-frequency PPP models: analytical and numerical comparisonLi Bofeng, Zang Nan, Ge Haibo, ShenIonosphere delay is a key factor in the single-frequency Precise Point Positioning (SFPPP). In tradition, two SFPPP models are applied, i.e., ionosphere-corrected (IC) and ionosphere-free-half (IFH) models. The ionospheric delays are directly corrected in IC model with exter...
2019 GPS Solut: Initial assessment of BeiDou-3 global navigation satellite system: signal quality, RTK and PPPZhang Zhiteng, Li Bofeng, Nie Liangwei, Wei Chunxiao, Jia Song, Jiang ShiqiZChina has recently established the primary constellation of BeiDou-3 global navigation satellite system (BDS-3). It is necessary to conduct a comprehensive assessment about its performance. The signa...
2019 Spatial Sci: Combined BeiDou-2 and BeiDou-3 instantaneous RTK positioning: stochastic modeling and positioning performance assessmentMiao Weikai, Li Bofeng, Zhang Zhiteng, Zhang XuewenThe global BeiDou navigation satellite system (BDS-3) has been in operation recently and many related applications have been already compatible with BDS-3 satellites. Most applications still use the...
2019 J Geod: Single-frequency GNSS cycle slip estimation with position polynomial constraintLi Bofeng, Liu Tianxia, Nie Liangwei,Single-frequency GNSS RTK is a promising technology in the popularization application due to its relative low expense compared to multi-frequency RTK. Owing to the incapability of forming between-frequency combination and the relatively poor quality of singl...
2019 Acta: Model assessment of GNSS-based regional TEC modeling: polynomial, trigonometric series, spherical harmonic and multi-surface functionLi Bofeng, Wang Miaomiao, Wang YueShen Yunzhong, Li BofengThe ground-based GNSS VTEC model can adequately capture the spatiotemporal characteristics of ionosphere activities. However, it is difficult to precisely model VTECs with a unified mat...
2019 J Geod: M-estimation using unbiased median variance estimateYang Ling, Shen Yunzhong, Li BofengThis paper first proves that the traditional median variance estimate is biased when the sample number is small and then proposes an unbiased median variance estimate to calibrate for the bias of the variance estimate. The scaled median variance estimate is firstly derived, and the unbi...
2019 J Geo-info: Indoor routing on logical network by using space semanticsLiu Liu, Zlatanova Sisi, Li Bofeng, Oosterom van Peter, Liu Hua, Barton Jack An indoor logical network qualitatively represents abstract relationships between indoor spaces, and it can be used for path computation. In this paper, we concentrate on the logical network that does not have notions for metrics. In...
2019 GPS Solut: Real-time carrier phase multipath detection based on dual-frequency C/N0 dataZhang Zhetao, Li Bofeng, Gao Yang, Shen Yunzhong Since carrier phase multipath cannot be easily captured or mitigated, especially in real-time and kinematic applications, it is necessary to assess the multipath significance. We propose a real-time multipath detection method using dual-frequenc...
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