VLBI Geodesy: Techniques and Recent Results

VLBI Geodesy: Observations, Analysis and Results

VLBI Techniques in Pulsar Astronomy

Very long baseline interferometry (VLBI) provides the resolution needed to make precision measurements of a pulsar’s parallax and proper motion. In making these measurements, the astronomer is faced with difficult calibration problems and a paucity of strong point-like calibrators that ultimately limit the accuracy of parallax measurements of even the brightest pulsars. A new technique to calib...

Geodesy Demonstration Experiment (gedex) for Space Vlbi: State of the Art and Software Development

The aim of the GEDEX, which is being designed by an international team of scientists, is to explore the feasibility of Geodetic & Geodynamic applications of Space VLBI. In this paper, the outline of this experiment has been presented. A brief description of the Space VLBI technique has been provided, followed by a summary of the significant theoretical developments. Salient features of the VSOP...

Recent techniques and results on the Erdős-Pósa property

Several min-max relations in graph theory can be expressed in the framework of the Erdős– Pósa property. Typically, this property reveals a connection between packing and covering problems on graphs. We describe some recent techniques for proving this property that are related to tree-like decompositions. We also provide an unified presentation of the current state of the art on this topic.

The Integration of Collocated GPS, VLBI and SLR Results

In recent years space geodetic techniques such as the Global Positioning System (GPS), Very Long Baseline Interferometry (VLBI), and Satellite Laser Ranging (SLR) have been collocated to address many applications in geoscience. While results from all these techniques are contaminated by various biases and errors, a commonmode signal has been found among the collocated results of GPS, VLBI and S...