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RISSurveying Network Design and Adjustment for Ballastless Track HSR: Case Study with the First HSR in China
Publisher: American Society of Civil Engineers
Global Navigation Satellite System Ambiguity Resolution with Constraints from Normal Equations
Publisher: American Society of Civil Engineers
Abstract: Carrier phase ambiguity resolution is the key to precise positioning with a global navigation satellite system (GNSS); therefore, quite a few ambiguity resolution methods have been developed in the past two decades. In ...
Can Long-Range Single-Baseline RTK Provide Service in Shanghai Comparable to Network RTK?
Publisher: ASCE
Abstract: Traditionally, 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 ...
GNSS Elevation-Dependent Stochastic Modeling and Its Impacts on the Statistic Testing
Publisher: American Society of Civil Engineers
Abstract: Only the correct stochastic model can be applied to derive the optimal parameter estimation and then realize the precision global navigation satellite system (GNSS) positioning. The key for refining the GNSS stochastic ...
GNSS Elevation-Dependent Stochastic Modeling and Its Impacts on the Statistic Testing
Publisher: American Society of Civil Engineers
Abstract: Only the correct stochastic model can be applied to derive the optimal parameter estimation and then realize the precision global navigation satellite system (GNSS) positioning. The key for refining the GNSS stochastic ...
Noniterative Datum Transformation Revisited with Two-Dimensional Affine Model as a Case Study
Publisher: American Society of Civil Engineers
Abstract: In geospatial applications, the datum transformation has been necessarily employed to transform the geospatial outcomes from the data-collection system to the user-interested system. Its key is to compute the transformation ...
Efficient Approximation for a Fully Populated Variance-Covariance Matrix in RTK Positioning
Publisher: American Society of Civil Engineers
Abstract: Global 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. ...
Extension of Internal Reliability Analysis Regarding Separability Analysis
Publisher: American Society of Civil Engineers
An Experimental Study on Air-Water Two-Phase Flow Patterns in Pebble Beds
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: An experimental study was conducted on the air-water two-phase flow patterns in the bed of rectangular cross sections containing spheres of regular distribution. Three kinds of glass spheres ...
Algorithm and Assessment of Ambiguity-Fixed PPP with BeiDou Observations and Regional Network Augmentation
Publisher: ASCE
Abstract: In precise point positioning (PPP) applications, uncalibrated phase delays (UPD) are applied to retrieve the ambiguity integers for achieving precise solutions over a short period. Also, the atmospheric corrections obtained ...