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...
2019 J Geod: Geometry-based cycle slip and data gap repair for multi-GNSS and multi-frequency observationsLi Bofeng, Qin Yanan, Liu TianxiaCarrier phase observations are commonly used in high-precision GNSS positioning applications, such as precise point positioning and real-time kinematic positioning, due to their millimeter precisions. Hence, it is a crucial module to handle cycle s...
2019 J Geod: High-precision GNSS ocean positioning with BeiDou short-message communicationLi Bofeng, Ge Haibo, Ge Maorong, Nie Liangwei, Shen Yunzhogn, Schuh HaraldThe current popular GNSS RTK technique would be not applicable on ocean due to the limited communication access for transmitting differential corrections. A new technique is proposed for high-precision ocean RTK, referred t...
2019 ASR: LEO enhanced Global Navigation Satellite System (LeGNSS) for real-time precise positioning servicesLi Bofeng, Ge Haibo, Ge Maorong, Nie Liangwei, Shen Yunzhogn, Gao Yang, Wang MiaomiaoGlobal Navigation Satellite System (GNSS) has been widely used in many geosciences areas with its Positioning, Navigation and Timing (PNT) service. However, GNSS still has its own bottleneck, s...
2018 RS: Site-specific unmodeled error mitigation for GNSS positioning in urban environments using a real-time adaptive weighting modelZhang Zhetao, Li Bofeng, Shen Yunzhogn, Yang LingIn Global Navigation Satellite System (GNSS) positioning, observation precisions are frequently impacted by the site-specific unmodeled errors, especially for the code observations that are widely used b...
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