GNSS

The System: Fly the Pilotless Skies: UAS and UAV

August 1, 2012By
civilaircraft

   Unmanned aerial vehicles and civil aircraft may co-habit the airspace after September 2015.  As the U.S. Federal Aviation Administration (FAA) moves ahead with plans for unmanned aerial systems/vehicles (UAS/UAV) to have regular access to U.S. airspace by 2015, it has encountered several barriers. For UAVs to be treated like manned aircraft, their systems likley need to be qualified... read more

This article is tagged with , , , , and posted in Defense News, Galileo, GNSS, The System, UAV/UAS/UGV

First Positioning Results Using Galileo Announced

July 17, 2012By

A team of Canadian and German researchers have obtained precise three-dimensional positions using measurements from the four prototype Galileo satellites now in orbit. The two In-Orbit Validation (IOV) satellites launched in October 2011 joined the two Galileo In-Orbit Validation Element (GIOVE) satellites launched in 2005 and 2008, forming a mini-constellation. For a few hours on certain days, signals from all... read more

Mission Accomplished for Galileo’s Pathfinder GIOVE-A

July 3, 2012By

Artist’s impression of GIOVE-A in orbit. (Photo by ESA – P. Carril) With the initial satellites of the Galileo constellation working well in orbit, it has been decided to end the mission of ESA’s pioneering GIOVE-A navigation satellite, reports the European Space Agency. Launched on December 28, 2005, this first experimental satellite performed the vital task of securing the radio... read more

This article is tagged with , and posted in Galileo, GNSS, Latest News

The System: British Patent Filings Threaten GPS III and Galileo Progress

July 1, 2012By

Two British technologists backed by the U.K. Ministry of Defense have filed patents on the future interoperable GPS and Galileo signal designs that severely disrupt modernization plans for both systems and suddenly, unexpectedly place receiver manufacturers in a highly uncertain and unfavorable situation. Some of the patents have been granted in the U.K. and in Europe, and applications are pending... read more

This article is tagged with , , , , and posted in Galileo, GNSS, GPS Modernization, The System

Out in Front: The Quick Quid

July 1, 2012By

Maybe we should take it as validation, an acknowledgment of the worth, maturity, and promise of the GNSS industry, that profiteers show up trying to make a fast buck. A prompt pound, a quick quid. Or perhaps we should be angry at this violation of international trust, this grasping effort to monetize the free and open exchange of scientific ideas, this contravention of the very spirit and tradition of global navigation satellite systems and signals. read more

This article is tagged with and posted in From the Editor, GNSS, GNSS Opinions, Opinions

Innovation: The Devil Is in the Details

July 1, 2012By
FIGURE 4. A CPSE observed on SVN48 (PRN07) on September 15, 2010, at 19:21:42 GPS Time. (Click to enlarge.)

Looking Closely at Received GPS Carrier Phase
The stability of a received GPS signal determines how well the receiver can track the signal and the accuracy of the positioning results it provides. While the satellites use a very stable oscillator and modulation system to generate their signals, just how stable are the resulting phase-modulated carriers? In particular, do received signals always conform to the published system specifications? In this month’s column we take a look at a specially designed receiver for analyzing GPS carrier phase and some of the interesting results that have been obtained. read more

This article is tagged with and posted in From the Magazine, GNSS, Innovation, Signal Processing

Reminder: Leap Second This Weekend

June 29, 2012By

News courtesy of CANSPACE Listserv. Likely none of us needs a reminder as the upcoming leap second has been all over the news outlets for the past few days. But just to provide the details again, read this article. Presumably, all GPS receiver manufacturers have checked to make sure their receivers will handle the leap second properly. However, at least... read more

This article is tagged with , and posted in Featured Stories, Signal Processing, Timing

The Patent Brouhaha

June 28, 2012By

Two British technologists backed by the U.K. Ministry of Defense have filed patents on the future interoperable GPS and Galileo signal designs that severely disrupt modernization plans for both systems and suddenly, unexpectedly place receiver manufacturers in a highly uncertain and unfavorable situation. Some of the patents have been granted in the U.K. and in Europe, and applications are pending in U.S. patent court, with a ruling expected at any time. read more

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