TAG: alternative PNT

Wildwood eLoran Transmitter Test Operations Continue

October 16, 2015By

According to UrsaNav Inc., the Wildwood eLoran (100 kHz) transmitter will be continuously broadcasting from 0900 (EDT) on Oct. 20 through 1800 (EDT) on Oct. 22. Wildwood will be broadcasting as 8970 master and secondary. In May, Exelis, UrsaNav, the Department of Homeland Security’s Science and Technology Directorate (DHS S&T) and the U.S. Coast Guard entered into a cooperative research and development agreement (CRADA)... read more

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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

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eDLoran: The Next-Gen Loran

June 28, 2014By

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

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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

Innovation: Cycle Slips

January 1, 2014By
FIGURE 1. A cycle slip affecting phase measurements but not the pseudoranges.

Detection and Correction Using Inertial Aiding
A team of university researchers has developed a technique combining GPS receivers with an inexpensive inertial measuring unit to detect and repair cycle slips with the potential to operate in real time. read more

UrsaNav Accepts Delivery of First Production Nautel NL40 eLoran Transmitter

November 19, 2013By

After extensive Final Acceptance Testing at Nautel’s Hackett’s Cove, NS facility, UrsaNav has accepted delivery of the first production NL40 Loran-C and Enhanced Loran (eLoran) transmitter. This seventh-generation Loran transmitter technology is the culmination of more than six years of collaborative development between the two companies. The transmitter successfully met or exceeded all of the requirements of the U.S. Coast... read more

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Moving the Game Forward: Transceivers Aboard Light Vehicles

October 1, 2013By

By John Carr and James Earl Perspectives from a senior technical specialist and a production engineer at Newmont Boddington Gold Mine. Newmont Fleet Management Services now continually monitors and plots the performance of JPS Locata alongside traditional GNSS in an effort to fine-tune the installed infrastructure. Learning to sculpt the perfect network continues as we move our JPS LocataLite transmitters... read more

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Synchronized Ground Networks Usher in Next-Gen GNSS

October 1, 2013By
LocataLite installation showing Jps transceiver tower.

An integrated GNSS+Locata system installed on drills, shovels, and bulldozers — the full complement of high-precision machines on site — at Australia’s Newmont Boddington Gold Mine has increased positioning accuracy and availability, as well as mine operational efficiencies, demonstrating an improvement in availability over GNSS-only of 75.3 to 98.7 percent. read more