A geometric delay model for Space VLBI
Instrumentation and Methods for Astrophysics
2014-06-19 v1
Abstract
A relativistic delay model for space very long baseline interferometry (hereafter SVLBI) observation of sources at infinite distance is derived. In SVLBI, where one station is on a spacecraft, the orbiting station's maximum speed in an elliptical Earth orbit is much bigger than the ground VLBI (here after GVLBI), leading to a higher delay rate . The delay models inside the VLBI correlators are usually expressed as fifth-order polynomials in time that good for a limited time interval, which are evaluated by the correlator firmware and track the interferometer delays over a limited time interval. The higher SVLBI delay rate requires more accurate polynomial fitting and evalution, more frequent model updates.
Keywords
Cite
@article{arxiv.1406.4846,
title = {A geometric delay model for Space VLBI},
author = {Shi-Long Liao and Zheng-Hong Tang and Zhao-Xiang Qi},
journal= {arXiv preprint arXiv:1406.4846},
year = {2014}
}