Adjustment and transformation strategies of ItalPoS Permanent GNSS Network

Abstract

A private network of 133 Global Navigation Satellite Systems (GNSS) permanent sites, named ItalPoS (Italian<br />Positioning Service) and uniformly covering the entire Italian territory, was established in April 2006 by the Italian<br />Division of Leica Geosystems S.p.A. This network also involves several GPS stations of the INGV (Italian<br />National Institute of Geophysics and Volcanology) RING (Real-time Integrated National Gps) network and GPS<br />stations from other public and private bodies. Indeed Leica Geosystems contributed with its experience and its<br />products to these networks which currently fulfil the national coverage where there are no ItalPoS stations. For<br />instance, the purpose of the ItalPoS network is mainly GNSS data distribution in terms of real time corrections<br />and RINEX files for the post-processing.<br />In order to compute and distribute to private and scientific users a set of adjusted coordinates of the ItalPoS network<br />in the IGS05 and ETRF89-2000 reference frames, a dataset of RINEX of about 120 GPS permanent sites<br />was created and processed, using the distributed sessions approach, by means of Gamit/Globk 10.3 GPS data<br />processor, also using some SOPAC (Scripps Orbits and Permanent Array Center) and EUREF (European Permanent<br />Network) solutions to improve the reference frame definition and the internal constraints.<br />This paper describes all the strategies adopted to estimate coordinates and velocities of the ItalPoS Network in<br />IGS05 and in ETRF89-2000 reference frames in the whole Italian territory.

Keywords

• GNSS Permanent Network – Globk Adjustment Strategies – Boucher-Altamimi transformation