From the Magazine

Research Online: Integer ambiguity resolution in GPS/INS, UAV multiple laser-inertial nav

April 8, 2016By

Integer ambiguity resolution in multi-epoch GPS/INS   A novel integer ambiguity resolution approach over a time window of GPS/IMU data enhances the reliability of obtaining high-accuracy position estimation, using carrier phase measurements, even in challenging environments. The method focuses on reducing computational cost. The achievable savings should be on the order of 104, while 600 has been demonstrated. The theoretical... read more

Innovation: Flying safe

April 4, 2016By
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GNSS robustness for unmanned aircraft systems
When siting the antenna of a GNSS receiver or designing a GNSS-based navigation system, electromagnetic compatibility is an important concern. This is particularly true for airborne platforms. In this month’s cover story, we take a look at how radio-frequency interference can impact GNSS equipment on unmanned aircraft systems and how robustly the equipment can navigate those systems. read more

Autonomous relative navigation

April 1, 2016By
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Future UAVs will require relative navigation capability to fulfill a broad range of assisted manned and unmanned missions. A new approach, demonstrated in application to aerial refueling, provides access to accurate relative time-space positioning information (R-TSPI) between platforms. By Shahram Moafipoor, Jeffrey A. Fayman, Lydia Bock and David Honcik The advent of unmanned aerial vehicles (UAVs) highlights the importance of precise... read more

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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