The Business and Technology of Global Positioning, Navigation, and Timing

GPS World Industry leaders look to GPS World for continuous innovation in delivery of the freshest, most comprehensive GPS/GNSS-related news to high-level corporate managers, project and engineering managers, product designers, researchers, and system developers.

GPS World, the magazine, has covered the global positioning industry since 1989.

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Read the Digital Issue: GPS World, October 2009

COVER STORY
ON THE EDGE
Elite Sensor Training 28
Competitive alpine skiers win or lose races by fractions of a second. Research has explored GNSS potential to provide position information to skiers and instructors during training. However, to date the size, weight, autonomy, accuracy, and availability performance have posed major obstacles to use.

The Sensor for the Training of Elite Athletes (STEALTH) overcomes these limitations to provide a racing edge for Canadian alpine ski teams.
By Gérard Lachapelle, Aiden Morrison, Richard Ong, and Gerald Cole

DEFENSE & GOVERNMENT
Fusion of Multi-Sensor Networks 40
Teamwork in GPS-Denied Environments
Collaborative navigation in GPS-denied environments can play a key role for dismounted warfighters, civilians, or robots in security, intelligence, and first-responder activities. Multi-sensor fusion algorithms based on optimization and a novel distributed iterative extended Kalman Filter produce a Teamwork Effect error-scaling law, an Anchor Effect for minimal numbers of optional RF navigation reference beacons, and a Reset Effect for position estimates that improve, rather than degrade, over time.
By Shunguang Wu, Jim Kaba, Siun-Chuon Mau, and Tao Zhao

OPINIONS & DEPARTMENTS INNOVATION
It’s Not All Bad 32
Understanding and Using GNSS Multipaqth
Telltale signs of multipath are the fluctuations in the signal-to-noise ratios (SNRs) reported by some GNSS receivers. In this month’s column, the authors look at how an analysis of SNR values can be used to map the multipath environment surrounding an antenna so that models of multipath can be constructed to further minimize its effect. Also, although an annoyance for most GNSS users, it turns out that multipath has its positive points.
By Andria Bilich and Kristine M. Larson

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This is GPS World. But the magazine has never limited itself to coverage of the U.S. Global Positioning System. We have also chronicled the development of GLONASS and Galileo; of WAAS and LAAS and NDGPS and EGNOS and private correction services; of MSAS, and QZSS, and Beidou, and GAGAN, and GRAS.

In addition to this business of global navigation satellite systems, we examine many fellow travelers, the technologies that GPS has taken along for the ride in its efforts to achieve greater accuracy, availability, integrity, and robustness. We're talking inertial sensors, LORAN-C, lasers, LIDAR, electronic compasses, cellular signal positioning, video signal positioning, odometers, wheel speed sensors, ultra wideband, RFID, Bluetooth, DSRC, and more.

These draw our interest because GPS — as a concept now, not just a physical manifestation— has spread relentlessly, inexorably across the landscape, the seas, into air space, into outer space. It has dived deep into integration with these technologies, driven by designers and engineers crafting new solutions for challenging problems in the marketplace.

Wherever it goes, we follow. That's because we all need some understanding of, or at least familiarity with, integration issues to follow GPS/GNSS in its ever-widening sphere of influence.

And because our fold increases daily. GPS World readers now come from all high-tech sectors, as other industries realize they can benefit from high-accuracy position and timing. Thanks to our new Digital Edition, all qualified readers can now get GPS World.

We're global. We're about position. And we study systems. We're not only GPS. We're more.

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