TAG: SBAS

EGNOS Gets to Work

February 1, 2011By
Figure 6. Time series of horizontal positioning errors for stand-alone GPS, conventional EGNOS, and position domain EGNOS solutions at HUEG IGS station.

GPS corrections from the European Geostationary Navigation Overlay Service can improve the positioning accuracy and user experience of GPS-enabled mobile phones, even if EGNOS satellites are not visible and even when the GNSS chipset in the phone does not support satellite-based augmentation systems. read more

This article is tagged with , and posted in Augmentation & Assistance, Mobile Devices, Wireless Infrastructure

On the Edge: Five Big Ones in Ten

January 1, 2011By

Look back with me at the five 2010 GNSS events that most affected surveying, mapping, engineering, construction, and natural resource users. Each one had, or could have had, a significant effect on you and your work. read more

This article is tagged with , , , and posted in Augmentation & Assistance, GLONASS, GPS Modernization, Mapping, Surveying

Expert Advice: Integrity: Lessons from the 2008 Financial Collapse

February 1, 2010By

Deterministic risk modeling, the basis of the Efficient Market Hypothesis (EMH) at the core of modern quantitative finance, is known to be fundamentally flawed, but its elegance and convenience has blinded researchers to growing evidence of its weaknesses. The near-complete acceptance of the EMH led to models that dramatically accentuate its flaws, which in turn led to absurd but eagerly accepted conclusions for loan-default risk. These models proved dramatically vulnerable to changes in the housing market in 2007–2008 and led directly to the ensuing crash. read more

This article is tagged with , and posted in Expert Advice & Leadership Talks, GNSS, GNSS Opinions, Opinions