From the Magazine

Respect the facts: March for Science

March 14, 2017By
Photo: Petr Kratochvil

In life, few things are certain. In family, love and friendship, fewer. Add more people — workplace, groups, associations, government, society, nations, war — and the complications multiply, the certainties become more scarce. Some things, however, remain fixed, and true. We call them facts. They are not subject to denial or claims of fakery. They can sometimes be distorted, or... read more

Sensor role reversal: How lidar can replace GNSS for navigation

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Airborne lidar/INS/GNSS: Algorithm Uses Fuzzy Controlled Scale Invariant Feature Transform Sensor role reversal: Lidar with its superior performance can replace GNSS in the integration solution by providing fixes for the drifting inertial measurement unit (IMU). Tests show its potential for terrain-referenced navigation due to its high accuracy, resolution, update rate and anti-jamming abilities. A novel algorithm uses scanning lidar ranging... read more

L1 receiver, UAV help discreet survey of private island

March 8, 2017By
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3DroneMapping completed a project under tight time and space constraints — surveying a tiny tropical island without disturbing guests. The 15-hectare island three kilometers from the Zanzibar coast is isolated from the rest of the world. Surrounded by coral reefs and sandbars, the island is home to an exclusive resort, but its limited space is threatened by erosion from changing currents.... read more

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GPS disruption a full-fledged aviation problem

March 6, 2017By and
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Several jamming incidents in 2016 highlight the increasing reliance on GNSS by commercial aviation and vulnerabilities of PNT-dependent devices and systems to real-world GNSS threats. Notices to Airmen (NOTAMs) and other warnings to pilots and crews reported GPS signal jamming near major international airports. Aircraft approaching or flying over these airports were advised to avoid using RNAV technology to plan... read more

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Hexagon and Locata offer solution to the mining puzzle

March 6, 2017By
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Locata Corporation and Hexagon Mining have partnered to bring Locata technology to mines. The JPS (Jigsaw Positioning System) is a radiolocation technology that replicates a highly accurate positioning network system, augmenting GNSS satellites with a ground-based positioning network. Created in partnership with Locata, JPS provides the same positioning accuracy of GNSS, but without the signal drop-out in deep pits and against... read more

System of Systems: DHS Receiver Improvements, Australian SBAS

March 6, 2017By
To improve precision navigation, a second-generation SBAS will use signals from both GPS and Galileo, and dual frequencies, to achieve even greater GNSS integrity and accuracy.

DHS Spells Out Receiver Improvements In early January, a new Department of Homeland Security (DHS) document appeared: “Improving the Operation and Development of Global Positioning System (GPS) Equipment Used by Critical Infrastructure.” The document focuses on receivers used in critical infrastructure, with an emphasis on timing receivers. It provides owners, operators, researchers, designers and manufacturers with information to improve the... read more

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Research Online: Narrowband interference mitigation, spoofing interference classification

February 27, 2017By
Spectrum of the Adaptive Notch Filter output signal for various interference levels

Get a rundown on two GNSS presentations: one on narrowband interference mitigation and on on spoofing, jamming and multipath interference classification. read more

New book explains GPS for the rest of us

February 24, 2017By
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GPS terms, its history and uses are all described in the new book GPS for Everyone: You Are Here by Pratap Misra. read more