By Oliver Montenbruck, Andre Hauschild (DLR/GSOC), Stefan Erker, Michael Meurer (DLR/IKN), Richard B. Langley (UNB), and Peter Steigenberger (TUM) The L5 signal of the new Block IIF satellite shows a very favorable signal strength (Fig. 1), which is somewhere in between the L1 and L2C signal strengt...
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As NextGen air traffic management increasingly relies on GNSS for safety-critical functions, some form of backup is needed in the event of GNSS signal loss, whether due to intentional jamming or other causes. A group working under the auspices of the Federal Aviation Administration (FAA) Navigation ...
Read More →Our readers respond to the cover features in the April, May, and June issues: the two-part special the “Origins of GPS” and Richard Langley’s look at “GPS by the Numbers.” Spilker and Parkinson: from GPS Origins to L5 Thank you so much, Brad, for the recognition...
Read More →Greg Turetzky by Greg Turetzky I started my relationship with GNSS and Moore’s Law in 1985, writing software for GPS tracking loops on the Advanced Range Instrumentation Aircraft program at the Applied Physics Laboratory of Johns Hopkins University for the U.S. Air Force. The project’s purpose w...
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A virtual reference station network covering a metropolitan area supplies position corrections to commuter buses equipped with a driver-assist system to enable safe operation, even under harsh weather conditions, along high-volume roadways. By Craig Shankwitz Bus-only shoulders on major traffic arte...
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By Jürgen Rossmann, Petra Krahwinkler, and Markus Emde Modern machines such as wood harvesters can automatically cut trees and remove branches, but an expert is still needed to plan a thinning and to mark the trees to be felled. The process can be accelerated if the forest ranger can virtually mar...
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This month’s professional OEM newsletter by Rob Lorimer is about the use of GPS and other positioning technologies in open-pit mining and compliments a GPS World webinar on this subject scheduled for 1 p.m. PST May 20. The article also appeared in the August 2010 issue of GPS World magazine with a...
Read More →By Brady O’Hanlon, Mark L. Psiaki, Paul M. Kintner Jr., and Steven P. Powell Anomalous behavior of the L1 C/A-code carrier phase has been detected on PRN07/SVN-48. The anomalies are sudden step-like changes of phase by about 10 degrees/5 millimeters. These steps are followed by negative steps ...
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