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...
2018 RS: Initial assessment of precise point positioning with LEO enhanced Global Navigation Satellite Systems (LeGNSS)Gw Haibo, Li Bofeng, Ge Maorong, Zang Nan, Nie Liangwei, Shen Yunzhong, SchThe main challenge of precise point positioning (PPP) applications is the long convergence time of typically a half hour, or even more, to achieve centimeter accuracy. Even when the multi-const...
2018 ApplSci: GNSS-based verticality monitoring of super-tall buildingsZhang Xing, Zhang Yongyi, Li Bofeng, Qiu GuangxinIn general, a laser plummet is used to transmit coordinates of reference points from the ground layer-by-layer, which can effectively control the verticality of super-tall buildings. However, the errors in transmission will accumulate with increasing height and motio...
2018 ASR: Modeling of the GPS satellite clock error and its performance evaluation in precise point positioningLi Haojun, Liao Xilin, Li Bofeng, Yang LingThe different functions, which include the polynomial and the harmonics based functions, are used to model and extrapolate the GPS satellite clock for simplifying the service mode and real-time application. The modeling accuracy decr...
2018 JSE: Efficient approximation to a fully populated variance-covariance matrix for RTK positioningZhang Zhetao, Li Bofeng, Shen YunzhoGlobal navigation satellite system (GNSS) observations have been shown to be physically correlated. Disregarding the physical correlations in a variance-covariance matrix (VCM) will lead to adverse impacts on GNSS applications. Typically, physical co...
2018 J Geod: A procedure for the significance testing of unmodeled errors in GNSS observationsLi Bofeng, Zhang Zhetao, Shen Yunzho, Yang LingIt is a crucial task to establish a precise mathematical model for global navigation satellite system (GNSS) observations in precise positioning. Due to the spatiotemporal complexity of, and limited knowledge on, systematic errors in GNSS observa...
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