Titlebook: IAG 150 Years; Proceedings of the 2 Chris Rizos,Pascal Willis Conference proceedings 2016 Springer International Publishing Switzerland 201

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Improved Parameter Estimation of Zenith Wet Delays Using an Inequality Constrained Least Squares Me affected by refractivity variations in the neutral atmosphere. This tropospheric delay, which represents a major contribution to the error budget of space geodetic observations, is generally considered by applying an adequate model (hydrostatic component) and by additionally estimating tropospheric

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The Realization of a Semi-Kinematic Datum in Greece Including a New Velocity Model,nt network of the contemporary static Hellenic Terrestrial Reference System of 2007 (HTRS07), experience significant inhomogeneous ground displacements. As time passes, the distortion of both networks results in increasing degradation of positioning accuracy and datum stability. For these reasons th

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Simulated VLBI Satellite Tracking of the GNSS Constellation: Observing Strategies,rence frames (TRF). The high number of available satellites of Global Navigation Satellite Systems (GNSS) provides an attractive existing infrastructure that could be utilized for such observations. The Vienna VLBI Software (VieVS) was extended for the possibilities of scheduling, simulating, and pr

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Impact of Antenna Phase Centre Calibrations on Position Time Series: Preliminary Results,decade. The associated reduction of noise in derived position time series has revealed the presence of previously undetected periodic signals. It has been shown that these signals have frequencies related to the orbits of the GPS satellites. A number of potential sources for these periodicities at t

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Optimized Parameterization of VLBI Auxiliary Parameters in Least-Squares Adjustment: Preliminary Repriori values need to be estimated. A priori information used in Very Long Baseline Interferometry (VLBI) data analysis is additionally needed for modeling and constraining the auxiliary parameters, i.e. zenith wet delays, clocks, and troposphere gradients, in order to stabilize the parameter estima

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The Antarctic Regional GPS Network Densification: Status and Results, carried out since 1995. Based on the Bernese GNSS Software the latest analysis yields results for about 30 stations aligned to the terrestrial reference frame solution IGS08. The obtained station motions are discussed in the context of plate kinematics and glacial-isostatic adjustment. It is demons