From the Magazine

Research: Assessment evaluates GNSS receivers’ tolerance of adjacent band

March 22, 2017By

By Stephen Mackey, Hadi Wassaf, Karen Van Dyke, Christopher Hegarty, Karl Shallberg, John Flake and Terence Johnson. The Adjacent Band Compatibility Assessment evaluated the adjacent radiofrequency band power levels that can be tolerated by GPS and GNSS receivers, to advance the U.S. Department of Transportation’s understanding of the extent to which such power levels impact devices used for transportation safety... read more

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2017 Simulator Buyers Guide

March 21, 2017By

Cast Navigation iP-Solutions Racelogic Skydel Spectracom Spirent Federal Systems Syntony-GNSS Talen-x Cast-5000 GPS wavefront generator CRPA and Attitude Determination Receiver Testing The CAST-5000 produces a single coherent wavefront of GPS RF signals to provide repeatable testing in the laboratory environment or anechoic chamber. The basic system generates four independent, coherent simulations that reference a single point and is upgradeable to... read more

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

March 15, 2017By and
FIGURE 9.  Normalized overall correlation with contributions from all satellites, including the satellite mirror-image of PRN 5.

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
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

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
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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