From the Magazine

Innovation: Position estimation using non-line-of-sight GPS signals

March 15, 2017By and

Reflected Blessings.
A technique developed by researchers at the University of Illinois at Urbana-Champaign distinguishes a reflected non-line-of-sight (NLOS) signal of a particular satellite from the LOS signal and characterizes the NLOS signal as coming from a virtual mirror-image satellite in the direction of the signal reflection point. By using information on the position and orientation of the reflector, the NLOS signal can be treated as an additional LOS signal. read more

Respect the facts: March for Science

March 14, 2017By

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

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

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

This article is tagged with , , , , , and posted in Featured Stories, From the Magazine, Survey

GPS disruption a full-fledged aviation problem

March 6, 2017By and

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

This article is tagged with and posted in Featured Stories, From the Magazine, Transportation

Hexagon and Locata offer solution to the mining puzzle

March 6, 2017By

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

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

This article is tagged with , , , and posted in From the Magazine, GNSS

Research Online: Narrowband interference mitigation, spoofing interference classification

February 27, 2017By

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