TAG: alternative PNT

Name the alt-PNT leader for a $50 gift card

February 13, 2017By
luwak

Quick, what’s the best alternative when GNSS signals are not available? This is not a simple question, but we’re asking for a simple answer. Among the multiple avenues pursued at the U.S. Defense Advanced Research Projects Agency (DARPA), as described in February’s PNT Roundup, which has the most promise? Inertial sensors Chip-scale atomic clocks Cell signals Low-Earth orbit communications satellites... read more

GNSS CEOs see bright future, alternative PNT promises well

December 28, 2016By
foursquare

It has been a good year for all global navigation satellite systems (GNSS), as the chief executives of each system testify here. Alternative positioning, navigation and timing (PNT) also thrives. In this roundup of the latest highlights from the past year and forecasts for the future, 2017 augurs very well indeed! Let’s look at the newest alternative-PNT offerings first, followed... read more

New SatNav offerings come to market via STL service

December 20, 2016By

Pursuant to a recent announcement of new PNT solutions independent of GPS/GNSS signals, provided via the Iridium constellation, GPS World talked with Jean-Yves Courtois, CEO of Orolia. Orolia has partnered with Satelles to bring new PNT products and services to the global market, with a focus on military, and defense, government and commercial customers worldwide. “We are a manufacturer and... read more

This article is tagged with , , , , , , and posted in Defense, Latest News, OEM

Opportunity for Accuracy: Terrestrial SOPs attractive supplement to GNSS

March 7, 2016By
morales_opener-O

Exploiting terrestrial signals of opportunity (SOPs) can significantly reduce the vertical dilution of precision (VDOP) of a GNSS navigation solution. Simulation and experimental results show that adding cellular SOP observables is more effective in reducing VDOP than adding GNSS space vehicle (SV) observables. read more

Wildwood eLoran Transmitter Test Operations Continue

October 16, 2015By

According to UrsaNav Inc., the Wildwood, NJ eLoran transmitter will be continuously broadcasting from 0900 (EST) on 21 October 2016 through 1200 (EST) on 22 November 2016. Wildwood will be broadcasting as 8970 Master and Secondary most of the time but occasionally may operate at other rates. In May, Exelis, UrsaNav, the Department of Homeland Security’s Science and Technology Directorate (DHS... read more

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

Timing Accuracy Down to Picoseconds

October 5, 2015By
Figure 5. Intermediate LocataLite 2 antennas inside FAA building. In the distance, both the USNO and the National Cathedral are visible.

Wide-Area Wireless Network Synchronization with LocataNets The United States Naval Observatory conducted several independent frequency synchronization experiments in Washington, D.C., using an alternative PNT technology in multiple network configurations. The results suggest that sub-nanosecond time transfer using this technology may be possible over wide urban areas, and that it could thus serve as a GPS augmentation or back-up solution over... read more

This article is tagged with , , , , , and posted in From the Magazine

eDLoran: The Next-Gen Loran

June 28, 2014By
vw-O2

Potential GNSS Back-up Improves to GPS-Level Accuracy
A new enhanced differential Loran system demonstrates 5-meter accuracy not achievable by the current DLoran system, and requires less expensive reference stations. A prototype tested in Rotterdam’s Europort area uses standard mobile telecom networks and the Internet to reduce correction data latency — a key source of error — by one to two orders of magnitude. read more

This article is tagged with , , , , and posted in Featured Stories, Transportation

Out in Front: How Much Farther?

May 1, 2014By

For some years now, we have been talking about GNSS interoperability. The concept has received so much careful attention at conferences, in R&D laboratories, in international working group forums, and behind closed high-level government and military doors, that one might understandably conclude that we have talked interoperability into existence. Not quite. Not nearly. Not by the farthest, if measuring into... read more