GPS System Integration Design & Test - GNSS and GPS System Design and Test
 
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GPS MODERNIZATION ARTICLES
Innovation: L5 Signal First Light
Great excitement surrounds the activation of a new transmitter from a satellite — an occasion dubbed first light. Research groups around the globe joined the GPS Wing in monitoring and analyzing the first L5 signals from space. We describe the equipment and procedures used to capture and analyze SVN49's signals and give an assessment of their characteristics.
LATEST SYSTEM DESIGN & TEST NEWS
Air Force Polls Receiver Makers for Solutions to Satellite Problems
The U.S. Air Force GPS Wing seeks comments from receiver manufacturers regarding the SVN-49 signal anomaly and the Air Force’s proposed solution. The Air Force has been investigating the cause and effects of signal distortions, observed as an elevation-dependent bias in ranging measurements, from the GPS IIR-20(M) spacecraft launched on March 24, 2009 and not yet set operational. As recently as June 19, the GPS Wing outlined solutions it planned to implement to compensate for the pseudorange errors, but now it states that "it is not possible for the Air Force to evaluate the myriad of civilian products and applications. Your help is urgently requested to […] evaluate […], conduct tests […], and provide recommendations and advice to the Air Force."
NovAtel to Supply Next-Gen WAAS Reference Receiver
GNSS OEM manufacturer NovAtel Inc. received a $9.7 million contract from the FAA to develop the next-generation WAAS reference receiver, the GIII.
ESA Inks for Four Launches, Long-lead Hardware
The European Space Agency signed two contracts for the procurement of so-called long-lead items for Galileo satellites, with Astrium GmbH and OHB Systems.
Analyses of a Drop in GPS Satellite Numbers
Professor Richard Langley of the University of New Brunswick (also GPS World Innovation editor) has done several analyses to see how the use of GLONASS satellites could help compensate for a potential reduction in the number of available GPS satellites. These studies came in response to a warning from the U.S. Government Accountability Office about the potential drop in the number of healthy satellites in the GPS constellation as a result of delays in both the Block IIF and Block III modernization programs.
SD&T NEWSLETTER: EDITOR'S COLUMN
Today Russia, Tomorrow the World!
We have something for everyone except Compass devotees in this issue. GLONASS looks stronger by the minute, having reached full operational capability over Russian territory. Correlatively, also growing stronger is the capability for users worldwide to fill current or impending GPS gaps with GLONASS satellites. The European Commission appears to have Galileo matters firmly in hand, awarding satellite contracts and moving in due and deliberate course forward, although not all contractors sound happy about it. And GPS operators solved one problem, moved up one launch, and have probably held back another.
ALGORITHMS & METHODS
Innovation: Precise Point Positioning
A Powerful Technique with a Promising Future
Is there a viable alternative to real-time kinematic (RTK) positioning? In this month's column, we take a look at the technique of precise point positioning (PPP). How close is PPP to prime time?
BLOG WITH THE EXPERTS

GPS World Tech Talk is a new blog where industry professionals and academics talk tech about GPS and GNSS systems, receivers, and applications. Every month, three new blogs are posted by international experts. Join us!

— Dorota Brzezinska, Forum Moderator

SIGNAL PROCESSING ARTICLES
SBAS Interference
Worst-Case Scenario
Some applications using data collected by fixed- or low-dynamic WAAS or other SBAS receivers may encounter a tracking error due to C/A code cross-correlation.
RECEIVER DESIGN ARTICLES
Pulling in Wideband
A direct-conversion receiver architecture meets the challenges of wideband GNSS signals, such as Galileo's E5 signal with bandwidth greater than 50 MHz.
GALILEO ARTICLES
Pulling in Wideband
A direct-conversion receiver architecture meets the challenges of wideband GNSS signals, such as Galileo's E5 signal with bandwidth greater than 50 MHz.
AUGMENTATION & ASSISTANCE ARTICLES
Bringing All GNSSs into Line
The introduction of new GNSSs requires updating the AGPS-only solution to add support for new GPS bands, new GNSSs, and to enhance accuracy, sensitivity, and availability.
INTEGRATION WITH OTHER TECHNOLOGY ARTICLES
Innovation: Ubiquitous Positioning
The UbiComp concept has spawned smart coffee pots, smart printers, smart copy machines and the like, all connected via a wired or wireless network. For a UbiComp device to know its position anywhere and anytime, we need "ubiquitous positioning" or UbiPos. This article looks at the available technologies that might be used to supplement conventional GPS positioning and some initial testing that will eventually lead to a UbiPos world.
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