From the Magazine

NDGPS loses interior, keeps coast

July 25, 2016By and

Heartland Corrections Services Now Commercial or WAAS-only The U.S. Coast Guard, Department of Transportation and Army Corps of Engineers have reduced the number of Nationwide Differential Global Positioning System (NDGPS) sites that will be decommissioned. The course correction keeps a coastal and Mississippi River network of stations largely intact, while discontinuing inland services. Last year at this time, the agencies... read more

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Iridium/GPS carrier phase positioning, fault detection

Interest in the Iridium constellation as a potential alternative and back-up provider of positioning and timing has increased with the announcement of impending operational capability. Overall concept information is hard to come by, but this 2009 ION GNSS paper gives an early look. The text is from the paper’s abstract. The iGPS high-integrity precision navigation system combines carrier phase ranging... read more

Inertial for soldiers, first responders in dangerous environments

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Integrated with images and dense distance measurements from a range camera using active illumination, inertial navigation produces real-time results on a tablet computer. Experiments demonstrate that the system provides good positioning and mapping performance in a range of indoor environments, including darkness and smoke. Positioning and mapping abilities for indoor environments can speed search and rescue, keep firefighters from getting lost, and help a commander... read more

Terrestrial beacons bring wide-area location indoors

July 12, 2016By and
Control-plane architecture (LTE) for NextNav E2E.

It has been easy to overlook these limitations as the enormous benefits of GNSS have become pervasive, but the increasing demand especially for indoor geolocation now requires a robust solution designed for the indoors and urban canyons. read more

New testbed for verifying location technologies

July 11, 2016By
(rmnoa357 / Shutterstock.com)

The FCC ordered that within six years, the elusive z-axis, or altitude, be added to requirements and meet accuracy standards in cases when there is no dispatchable location. read more

Innovation: Evolutionary and revolutionary

July 11, 2016By
FIGURE 1.  An extended bandwidth GNSS antenna. The lower and connected dipoles are tuned to L2 and the upper coupled shorted dipoles are tuned to L1. Current flow in the circular waveguide of the GNSS antenna is shown. Strong circumferential currents flow at the top of the waveguide. Red indicates large currents and the arrows show the directions of the current flow.

The development and performance of the VeraPhase GNSS antenna By Julien Hautcoeur, Ronald H. Johnston and Gyles Panther ANTENNAS MATTER. Often overlooked by the casual user of a GNSS receiver, its antenna is a critical component of the system. In the case of consumer equipment such as handheld receivers, satellite navigation units and embedded devices inside smartphones, cameras and fitness... read more

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Google to provide raw GNSS measurements

July 10, 2016By
The keynote presentation at Google IO 2016, held May 12-20, at Shoreline Amphitheater in Mountain View, California.

User location takes center stage in new Android OS Raw GNSS measurements from Android phones. Yep, they are coming. At Google we have been working with our GNSS partners to give application developers access to raw GNSS measurements from a phone. This is really exciting, and marks a new era for our GNSS community. At Google I/O in May, we announced... read more

Networking for assisted PNT

July 8, 2016By
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A networked radio from Thales is designed to meet soldiers’ need for assured positioning, navigation and timing (PNT) while on foot. The MBITR2 is part of a broader defense effort to provide PNT solutions in case of GPS jamming or interference. The MBITR2 is one of a number of devices and technologies, many still in development, to address this need.... read more

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