Vectorial integer bootstrapping of best integer equivariant estimation (VIB-BIE) for efficient and reliable GNSS ambiguity resolutionWeikai Miao, Bofeng Li, Yang Gao, Guang’e ChenAbstract: Reliable integer ambiguity resolution (IAR) is essential for carrier phase-based centimeter-level accurate positioning using global navigation satellite systems (GNSSs). In all IAR methods, the best integer ...
2021 J Geod: The hypothesis testing statistics in linear ill‑posed modelsLi Bofeng, Wang Miaomiao,Shen YunzhongIn the geodetic community, an adjustment framework is established by the four components of model choice, parameter estimation, variance component estimation (VCE), and quality control. For linear ill-posed models, the parameter estimation and VCE have been extensively investigated. H...
2020 SateNavi: Improved precise positioning with BDS‑3 quad‑frequency signalsLi Bofeng, Zhang Zhiteng,Miao Weikai,Cheng Guang'eThe establishment of the BeiDou global navigation satellite system (BDS-3) has been completed, and the current constellation can independently provide positioning service globally. BDS-3 satellites provide quad-frequency signals, which can benefit the ambiguity resolu...
2020 ASCE: Can Long-Range Single-Baseline RTK Provide Service in Shanghai Comparable to Network RTK?Zhang Zhiteng, Li Bofeng, Zou JunpingTraditionally, GPS real-time kinematic (RTK) technique can provide precise positioning for short baselines, and network-based RTK (NRTK) is much more effective than the single-baseline RTK (SRTK) stemming from its capability of precise positioning ov...
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...
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