From the Magazine

System of Systems: OCX to Cost More, Come Later

April 1, 2016By
The next-generation GPS ground-control system, known as OCX.

GPS III program slowed by funds diversion. The White House budget request for the Next Generation Operational Control System (OCX) comes to $393.3 million for fiscal year (FY) 2017. read more

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Keep your distance: Relative position key to industrial jobs

March 28, 2016By
Airborne Ranger (top left) continuously monitors the distance between itself and the silo, transmitting the separation to pilot and payload operator (foreground).

Operating in industrial environments, where no margin for error is tolerated, is complex, stressful and delicate. The distance from an in-flight UAV to the industrial asset that it is observing or inspecting obviously has critical importance for safety, data precision and cost-effectiveness. The AiRobot Ranger counters this problem by displaying the distance between the UAV and the object of interest... read more

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2016 Simulator Buyers Guide

March 22, 2016By
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Check out GPS World's Simulator Buyers Guide from a special section of our March 2016 issue for GPS, GNSS and GLONASS simulators. Companies featured include Cast Navigation, IFEN GmbH, Racelogic, Skydel, Spectracom and Spirent Federal Systems. read more

PNT Roundup: Inertial, acoustic, lidar, Wi-Fi and beacon news

March 10, 2016By
Brandon Bordelon (top) carries aided inertial navigation systems for demanding subsea survey, construction and vessel positioning applications. Right: The position reference system on the ship’s command bridge.

Independence, redundancy at sea Acoustically aided inertial navigation technology will enable a specialized sea vessel maintain dynamic positioning through GNSS disruptions in challenging environments. Sonardyne Inc.‘s dual Ranger 2 Pro DP-INS systems aboard the ultra-light intervention vessel Brandon Bordelon will track remotely operated underwater vehicles (ROVs) during inspection, repair and maintenance activities, providing an independent position reference for the ship’s... read more

Expert Opinions: What key challenge should developers test for in a full PNT solution?

March 9, 2016By

Q: What key challenge should system integrators and product developers test for in a full position, navigation and timing solution? A: Spoofing is normally associated with the creation of false signals in order to generate a position error, but the same technique may be used to distort a timing solution. With GNSS timing systems being used in critical infrastructure, like... read more

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Innovation: Clarifying the ambiguities

March 8, 2016By
FIGURE 1. Public providers of PPP-AR products.

Examining the interoperability of precise point positioning products
Our authors look at the interoperability of PPP ambiguity resolution products distributed by several research organizations for improving position solutions. read more

Opportunity for Accuracy: Terrestrial SOPs attractive supplement to GNSS

March 7, 2016By
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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

Water utility deploys iPad solution

March 2, 2016By
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Like thousands of water utilities across the U.S., the City of Sebring, Fla., Utilities Department is tasked with providing a safe and reliable water supply, while managing all the dispersed assets of the water distribution and wastewater systems. This means regularly locating, mapping and inspecting assets to maintain service levels and operations. When Sebring evaluated this approach, the city received... read more