From the Magazine

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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Have Accuracy, Will Travel

October 4, 2015By
Photo courtesy of Trimble.

BYOD Sub-Meter Positioning for Mapping and GIS Professionals Employees bringing their own mobile phones and tablets to their jobs in the field enables them to complete more tasks using fewer devices. However, this practice introduces operational and security vulnerabilities. By Matt van Doorn In the mapping and GIS industries, mobile devices such as smart phones and tablets have a growing... read more

Precision Ag’s New Frontier

October 3, 2015By
GPS Landforming enables growers to design field leveling, drainage and irrigation for water management (photo courtesy Trimble).

GPS landforming is the reshaping of a fields topography to predesigned 3D surfaces using high-accuracy GPS to control the blade height of the earth-moving machine. It is typically done to improve surface drainage and water infiltration uniformity. Davco Optisurface, the company that developed the 3D landform design software OptiSurface Designer, has seen strong adoption as the concept catches on. The... read more

ION GNSS+ Product Showcase

October 1, 2015By

Record & Playback The Averna RP-6100 Multi-Channel RF Record & Playback for RF application testing allows users to tecord real-world signals such as GNSS, HD Radio, LTE and Wi-Fi — plus impairments — to significantly advance projects and harden product designs. Skydel Solutions’ GNSS simulator is an entirely software driven innovative and cost-effective simulator that works with the RP-6100, enabling users... read more

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High Above Down Under: Database Offers 3D Elevation Model of the Globe

October 1, 2015By

Wilpena Pound, shown above, is a natural amphitheater of mountains in the heart of Flinders Ranges National Park in South Australia. Wilpena Pound is 17 kilometers long and 8 kilometers wide, covering an area of 100 kilometers. The highest peak is St. Mary Peak, at 1,170 meters. The WorldDEM Digital Elevation Model of the Pound is based on data acquired... read more

The Business — October 2015

October 1, 2015By

The Business section from the October 2015 GPS World. Download the PDF. Includes: INTERGEO’s Massive Marketplace Antenova GNSS Antenna Integration What Mattered Most at CTIA Super Mobility Week UAV, Survey Markets Key for Maxtena Growth Broadcom’s New Chip for Internet of Things Autonomous Vehicles, Drones Next Big Thing for u-blox PCTEST Expands Antenna Testing Capabilities with Rohde & Schwarz Spirent Robust... read more

The System: Galileo Turning Ten

September 30, 2015By
Galileo 9 and 10 lift off. (Credit: ESA)

Galileo satellites 9 and 10 are functioning perfectly, and the initial series of flight operations is continuing as part of the critical launch and early orbit phase, according to a European Space Agency Rocket Science blog by Daniel Scuka, senior editor for Spacecraft Operations at ESOC, ESA’s European Space Operations Centre, Darmstadt, Germany. Galileo 9 and 10 lifted off together... read more

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Innovation: Getting There by Tuning In

September 4, 2015By
FIGURE 8. Worst-case result for five-transmitter tracking. (Photo map courtesy of Google.)

Using HD Radio Signals for Navigation By Ananta Vidyarthi, H. Howard Fan and Stewart DeVilbiss THE YEAR WAS 1906. On Christmas Eve of that year, Canadian inventor Reginald Fessenden carried out the first amplitude modulation (AM) radio broadcast of voice and music. He used a high-speed alternator capable of rotating at up to 20,000 revolutions per minute (rpm). Connected to... read more