says K Ramalingam, Chairman, Airports Authority of …
First Galileo satellite launched from Kazakhstan
The EU’s fi rst satellite of the Galileo navigation program has been launched from Kazakhstan. The 600 kg British built spacecraft, named “Giove A,” took off from the Baikonur Cosmodrome on a Soyuz rocket early Wednesday morning (28 December 2005). The satellite is part of Galileo, the €3.4 billion system from which the EU is aiming to deploy a total of 30 satellites by 2010. The network will provide access to precise timing and location services delivered from space to the bloc’s member states. The Galileo project aims to revolutionise industries including transport and will be used in maritime, rail and other navigation systems. According to reorts it will help the EU to set up a new air-traffi c control system, allowing pilots to fly their own routes and altitudes. Giove A will test technologies needed for the other components of the project, like the in-orbit performance of two atomic clocks or radio frequencies assigned to Galileo within the International Telecommunications Union. Galileo is a joint project between the EU and the ESA.
http://euobserver.com
says Lt Gen Ranjit Singh, SM, Engineer-in-chief and …
The 49th Annual General Meeting of Institution of Surveyors …
As the GPS surveying techniques started showing promise of high accuracy geodetic positioning in the early 1990s, few “open-minded” geodesists realized the possibility of using ellipsoidal heights in place of orthometric heights. Many conceptual approaches were mentioned and proposed in various applications. However, Steinberg and Papo were the fi rst to publish a paper entitled “Ellipsoidal Heights: The Future of Vertical Geodetic Control” (GPS World, Vol. 9, No. 2, 1998). As could be expected, Petr Vanicek, a geodesy professor, was quick to downplay the proposed new “type” of vertical control (GPS World, Vol. 9, No. 4, 1998). It seems that Steinberg and Papo did not “defend” their new proposal. Thus, in this paper, a review has been made to check and comment on Vanicek’s example against the ellipsoidal heights, reference to orthometric islands, and issuance of a warning for non-dissemination of ellipsoidal heights to Canadian users.
In early 2004 a plan was hatched to develop a Global Navigation Satellite System (GNSS) receiver based around Field Programmable Gate Array (FPGA) technology as a platform to support research in this fi eld. A joint project was set up between the School of Surveying and Spatial Information Systems (SISS) at the University of New South Wales and the National ICT Australia (NICTA), and soon after a small team was established. The team consisted of Kevin Parkinson, a post-graduate student at SISS with experience in FPGA and circuit board design, Frank Engel, a researcher with NICTA with software, Real Time Operating Systems (RTOS) and VHDL design knowledge and me, Peter Mumford from the SISS GNSS research group. At the end of the project we hoped to have an L1 GPS receiver running on a custom circuit board with the baseband processor and navigation solution processor running on an FPGA chip. The project is coming to an end now, and in this article, I will describe our design path, what has been achieved to date and then some potential research areas, but fi rst a little background.
GNSS is a global navigation satellite system comprising of network of satellites that transmit ranging signals used for positioning and navigation anywhere around the globe; on land, in the air or at sea. The US Global Positioning System (GPS/Navstar GPS), the Russian Global Navigation Satellite System (GLONASS) and the upcoming European GALILEO system, Data communications satellites with navigation payloads and Augmentation systems are all part of GNSS.
In the present paper, a method making a long baseline kinematic positioning possible in the present dual frequency system is discussed
In the discussion, the wide lane observation equations are used, since the initial ambiguities of wide lane combinations are calculated easily by using HMW (Hatch- Melbourne-Wübbena) combinations.
(5.00 out of 5)