2017 测绘学报: 3种GPS+BDS组合PPP模型比较与分析臧楠, 李博峰, 沈云中无电离层组合和非组合模型是GNSS精密单点定位(PPP)常用的两种函数模型。本文通过详细分析PPP的两种函数模型各类参数间的相关特性,建立了参数独立的函数模型。对非组合PPP模型的电离层参数引入虚拟观测方程进行约束,有效提高了PPP的收敛速度。最后,从定位精度和收敛时间两方面分析不同函数模型的GPS单系统和GPS+BDS组合PPP静态、模拟动态定位效果...
2017 导航定位学报: 顾及自变量与因变量误差及相关性的线性回归 BDS超宽巷实时定位分析李振，李博峰为了提高BDS超宽巷实时定位的精度,充分利用超宽巷模糊度单历元固定的优势,研究直接采用超宽巷进行RTK定位:提出忽略电离层和消电离层2种超宽巷RTK定位模型,并分析比较2种模型的定位效果。结果表明:在50km范围内,忽略电离层模型的平面定位精度可达到15cm以内,消电离层模型的平面定位精度可达到0.5m以内;在中长距离的情...
2017 ASR: The influence of improper stochastic modeling of BeiDou pseudoranges on system reliabilityYang Ling, Li Bofeng, Li Haojun, Chris Rizos, Shen YunzhongStochastic models are important in Global Navigation Satellite System (GNSS) estimation problems, not only for parameter estimation, or precision assessment, but also for deriving system reliability and integrity measures. China...
2017 J Geod: Improving BeiDou precise orbit determination using observations of onboard MEO satellite receiversGe Haibo, Li Bofeng, Ge Maorong, Shen YunzhongIn recent years, the precise orbit determination (POD) of the regional Chinese BeiDou Navigation Satellite System (BDS) has been a hot spot because of its special constellation consisting of five geostationary earth orbit (GEO) sa...
2017 JSE: Extension of internal reliability analysis regarding separability analysisLi Bofeng, Li Zheng, Zhang Zhiteng, Tan Yu'anMinimal detectable bias (MDB) describes a system's general ability to detect the existence of a single outlier. However, successful identification probability is closely related to the correlations between w-statistics. When the correlation is high, the vali...
2017 J Geod: Extra-wide-lane RTK of triple-frequency GNSS signalsLi Bofeng, Li Zheng, Zhang Zhiteng, Tan Yu'anTriple-frequency signals have thus far been available for all satellites of BeiDou and Galileo systems and for some GPS satellites. The main benefit of triple-frequency signals is their formation of extra-wide-lane (EWL) combinations whose ambiguities can be instantaneously fi...
2017 GPS Solut: Impacts of BeiDou stochastic model on reliability: overall test, w-test and minimal detectable biasLi Bofeng, Zhang Lei, Verhagen SandraExtensive studies have concluded that the GNSS observations are heteroscedastic and physically correlated. Typically, the observation precisions are elevation dependent and between-frequency cross-correlations and time correlations exi...
2017 Geod Geodyn: Comparison and analysis of unmodelled errors in GPS and BeiDou signalsZhang Zhetao, Li Bofeng, Shen Yunzhong, Yang LingExtensive studies on signal noise analysis of Global Navigation Satellite Systems (GNSS) receivers are mainly based on zero and/or short baselines where a pair of receivers is required. This paper develops a new signal noise assessment method for a...
2017 Acta Geod Geophys: A noise analysis method for GNSS signals of a standalone receiverZhang Zhetao, Li Bofeng, Shen Yunzhong, Yang LingExtensive studies on signal noise analysis of Global Navigation Satellite Systems (GNSS) receivers are mainly based on zero and/or short baselines where a pair of receivers is required. This paper develops a new signal noise assessment method for a ...
2017 GPS Solut: Impact of GPS differential code bias in dual- and triple-frequency positioning and satellite clock estimationLi Haojun, Li Bofeng, Lou Lizhi, Yang Ling, WanThe features and differences of various GPS differential code bias (DCB)s are discussed. The application of these biases in dual- and triple-frequency satellite clock estimation is introduced based on this discussio...
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