From the Magazine

ION GNSS+: To Space and Beyond

August 3, 2015By
Crowds gather at the GPS World booth at ION GNSS+ 2014.

ION GNSS+ 2015 is the 28th International Technical Meeting of the Institute of Navigation’s Satellite Division and the world’s largest technical meeting and showcase of GNSS technology, products and services and other sensors in today’s marketplace. The conference will be held Sept. 14-18 (tutorials Sept. 14-15) at the Tampa Convention Center in Tampa, Fla. James L. Green, director of Planetary Science for NASA, will take the audience on a journey navigating... read more

Frozen Assets: GeoDecisions Platform Tracks Icebergs

August 2, 2015By
Drifting tabular icebergs viewed from the Amundsen. (Photo courtesy of Greg McCullough, University of Manitoba)

A Canadian expedition team used GeoDecisions’ GeoILS platform to help track icebergs during a voyage to better understand how icebergs drift. An intelligent location server using the Esri ArcGIS platform, GeoILS enables users to monitor and locate assets and facilitate quick and coordinated responses. GeoDecisions, an information technology company specializing in geospatial solutions, partnered with Solara Remote Data Delivery Incorporated,... read more

A Scintillating Project

August 1, 2015By
Setting up the receiver antenna for the offshore trial on board the Geograph vessel.

Countering Ionospheric Disturbances Affecting GNSS in Brazil By Marcio Aquino After 27 months of intense research, the CALIBRA project ended successfully in February 2015, with the project team devising solutions to tackle the effects of perturbations typical of the Brazilian ionosphere on high-accuracy GNSS positioning. CALIBRA was funded by the European Union and the European GNSS Agency. Kicked off in 2012, CALIBRA first confirmed the vulnerability of... read more

Sentry Stands on Jammer Alert

July 31, 2015By
FIGURE 4. Urban area test; jammer locations
in yellow, locations delivered by Signal
Sentry in red, sensor locations in green.

By Jeffrey Coffed and Joseph Rolli, Harris The first and best step to combat the growing worldwide problem of GPS jamming is to pursue technologies that can detect and locate the jammers. Signal Sentry 1000 uses arrayed sensors to do just that: look out for jamming and track down its source once sensed. An array of sensors can be deployed... read more

A WINS for Warfighters

July 30, 2015By
The current WINS form factor (left) sits beside a prototype for the future incarnation.

A new device is being developed to enable foot soldiers to find their exact location in GPS-denied situations. If satellite signals are blocked by heavy jungle canopy, or because of enemy interference, soldiers — and Headquarters — will still know where they are with the Warfighter Integrated Navigation System (WINS). read more

Steep Questions: How Tall is K2?

July 29, 2015By
_7 a Campo 3 a

Surveying the world’s highest peaks is a daunting task. One international survey team set out to measure the Himalaya’s K2 peak, the second highest in the world after Mount Everest. read more

Innovation: Seeing the Light

July 1, 2015By
FIGURE 2. GRD-based image correspondence illustration as a function of 2-D relative navigation state.

We look at the development of a generalized vision-aided integrity monitor for precision relative navigation applications. A vision-aided integrity monitor could be extremely valuable in augmenting existing precision relative navigation systems, such as GPS, for many different safety-critical aerospace applications. read more

Street Smart: 3D City Mapping and Modeling for Positioning with Multi-GNSS

July 1, 2015By
Figure 1. Example of the GNSS signal propagation using ray-tracing and a 3D building map.

A particle-filter-based positioning method using a 3D map to rectify the errors created by multipath and non-line-of-sight signals on the positioning result delivered by a low-cost single-frequency GPS receiver takes a multi-GNSS approach, using the combined signals of GPS, GLONASS and QZSS. The method outperforms conventional positioning in availability and positioning accuracy. It will likely be fused with other sensors in a future pedestrian navigation application. read more