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Antenna-induced biases in GNSS receivers May 17, 2007

May 17, 2007 - By

By Inder Jeet Gupta It is well known that the phase center of a GNSS antenna can vary with the satellite direction. This phase center movement leads to aspect dependent carrier phase and code phase biases in the satellite signal. For precise geo-location, one needs to characterize the antenna-induced carrier and code phase biases over the upper hemisphere. In the... read more

This article is tagged with , and posted in OEM, Tech Talk

Survey Perspectives – May 2007

May 17, 2007 - By

Whether you live in London, Lagos, Lisbon, or Los Angeles, when you are looking to buy a survey instrument, most likely you have a preferred instrument distributor in mind. Maybe it´s the local Topcon dealer. Perhaps your Leica dealer has served you well. Or you might prefer the Trimble dealer in your area. All of the manufacturers have distributors signed up around the world. Some operate on a regional basis, serving several countries, while others serve one specific country. I raise this point because of recent, significant changes in the U.S. distribution of survey instruments. read more

This article is tagged with and posted in Newsletter Editorials, Opinions, Survey, Survey Scene