From the Magazine

Synchronized Ground Networks Usher in Next-Gen GNSS

October 1, 2013By
LocataLite installation showing Jps transceiver tower.

An integrated GNSS+Locata system installed on drills, shovels, and bulldozers — the full complement of high-precision machines on site — at Australia’s Newmont Boddington Gold Mine has increased positioning accuracy and availability, as well as mine operational efficiencies, demonstrating an improvement in availability over GNSS-only of 75.3 to 98.7 percent. read more

Innovation: Under Cover

September 1, 2013By
FIGURE 1. Artist’s impression of the synthetic-aperture GNSS system for surveying in a forest.

Synthetic-Aperture GNSS Signal Processing
We take a look at a novel GNSS signal-processing technique, which uses the principles of SAR to improve code and carrier-phase observations in degraded environments such as under forest canopy. The technique can simultaneously reject multipath signals while maximizing the direct line-of-sight signal power from a satellite. Along with a specially programmed software receiver, it uses either a single conventional antenna mounted, say, on a pedestrian’s backpack for GIS applications or a special rotating antenna for high-accuracy surveying. Want to learn more? Read on. read more

This article is tagged with , , and posted in Algorithms & Methods, From the Magazine, Innovation

Signal Quality of Galileo, BeiDou

September 1, 2013By
Figure 1. 30-meter high-gain antenna.

Future positioning and navigation applications of modernizing and newly established GNSSs will require a higher degree of signal accuracy and precision. Thus, rigorous and detailed analysis of the signal quality of recently launched satellites, including the discovery of any possible imperfections in their performance, will have important implications for future users. read more

GNSS and Radio Astronomical Observations

August 1, 2013By
VLA_DGilder1_med-W

An alternative tool for detecting underground nuclear explosions? By Dorota A. Grejner-Brzezinska, Jihye Park, Joseph Helmboldt,  Ralph R. B. von Frese, Thomas Wilson, and Jade Morton Well-concealed underground nuclear explosions may go undetected by International Monitoring System sensors. An independent technique of detection and verification may be offered by GPS-based analysis of local traveling ionospheric disturbances excited by an explosion.... read more

Robot: Target on Its Back

August 1, 2013By
A robot target vehicle with the footprint of a car measure 4 inches high.

A new state-of-the-art research center runs car-makers’ safety systems through their paces, in tandem with a soft-target robot that can be crash-impacted without adverse effects. Precise positioning and exact repeatability of test sequences are key criteria. read more

Automatic Threat Assessment: Tracking System Tells Friend from Foe

August 1, 2013By
THE COMBINATION of intrusion sensors and a tracking system allows for Automatic Threat Detection.

Ongoing threats from terrorist activities at critical facilities require early detection before the threats can reach their target and complete their mission. This has produced the need for advanced security systems to effectively detect terrorist activity, while reducing alarms caused by normal friendly activity. Automatic Threat Assessment, also referred to as Identify Friend or Foe (IFF), is the ability to automatically acknowledge alarms created by friendly assets. It can be achieved with a security system that uses GPS and geospatial data to go beyond the typical intrusion-sensor-only configuration. read more

This article is tagged with and posted in From the Magazine, Personal Tracking, Security & Surveillance

Innovation: Getting a Grip on Multi-GNSS

July 1, 2013By
Fig1_new

The International GNSS Service MGEX Campaign
GPS is almost 40 years old. While mass consumer use of GPS began only within the past decade or so, GPS was "born" during the Labor Day weekend of 1973, when about a dozen military officers and industry analysts under the leadership of Brad Parkinson met to consolidate the concept for a single satellite-based navigation system for the U.S. Department of Defense. Their proposal for NAVSTAR GPS was approved on December 22, 1973. The first satellite to be launched under the GPS program, on July 14, 1974, was the Naval Research Laboratory’s Navigation Technology Satellite (NTS) 1. read more

This article is tagged with and posted in BeiDou/Compass, From the Magazine, Galileo, GLONASS, GPS Modernization, Innovation

Every Computer a Mobile Computer

July 1, 2013By
Fleming-opener

Organizations across business and public sectors, and including the military, now expect a high degree and broad range of functionality in the palms of workers’ hands, wherever those workers may go, in any kind of hazardous, chaotic, demanding environment. Requirements for location accuracy rise consistently across the board. In the future — in other words, now — developers will be asked to write mobile software applications first, and desktop applications second. read more