Bringing New Capabilities to the Global Community
GPS III — the next generation of GPS satellites — promises better performance and new abilities to users. Here, authors from the designer and builder of those new satellites go deep into the technology and operational requirements to explain how modernized GPS III will benefit users worldwide.
A System to Detect GNSS Jamming and Interference
GPS jamming increases steadily, and new mitigation methods are high on the list of priorities for government and industry alike. Among the most advanced of these efforts is a public/private initiative in the United Kingdom that combines GNSS, eLoran, and communication links in a network of monitoring stations that already demonstrate success in detecting and identifying the source of intentional interference.
Navigation in the Arctic
Oil exploration and shipping in the Arctic are on the rise. The delicate far North environment makes accidents particularly dangerous and navigation integrity critical. This article investigates the benefits of space-based augmentation systems (SBAS) — such as WAAS, EGNOS, and MSAS — to strengthen that integrity. The authors suggest new SBAS reference stations, Iridium satellites to broadcast integrity information to the users, and multi-constellation GNSS to improve vertical performance.
Cooperative Vehicle Safety Applications Using an Integrated Positioning Solution
The blocked and reflected GNSS signals in urban canyons make it difficult to develop a practical autonomous vehicle. This article suggests a multi-sensor fusion position solution for cooperative vehicle safety applications. The authors
used integrated GPS/inertial navigation, clocks, odometers and lidar to navigate downtown Detroit. They evaluate their performance in this article.
Integrated Solutions on Consumer Mobile Devices
The promise of micro-electro-mechanical system (MEMS) technology has teased the GPS community for several years. Integration of MEMS with GPS and Wi-Fi demonstrates new urban and indoor positioning capabilities in challenging RF environments.
Aviation Applications: Hybrid Navigation Techniques and Safety-of-Life Requirements, Part 2
Unlike most families that become stronger the more they have in common, pseudorandom noise families grow more robust as their differences increase. This column introduces some new offspring from the familiar elements of GNSS and other radionavigation system codes.
The Washington View
Budget storms have reappeared on the horizon and the fore¬cast for defense expendi¬tures, including for the GPS program, is grim with a high probability of ugly.
Common sense and due diligence would seem to call for holding off on rolling out LightSquared’s system until further tests can be conducted.
How does measurement differencing affect my computed position?
GNSS Data Points and Factoids to Amuse and Inform
In this issue: Kitty Collars, Toxic Testers, Not THAT Soyuz, Japan's First and Spacekeeping
Guoquan Wang reviews CORS and OPUS for Engineers edited by Tomás Sole. This is the first book systematically introducing the Continuously Operating Reference Station and the Online User Positioning Service , two major innovations of the National Geodetic Survey (NGS) of National Oceanic and Atmospheric Administration (NOAA).
More GNSS systems — success or excess?
Rapidly proliferating numbers of satellites mean more signals available for use. But could we end up having too much of a good thing?