Design & Test

Innovation: Filling in the Gaps

October 1, 2011By
Fig5

Improving Navigation Continuity Using Parallel Cascade Identification
To reliably navigate with fewer than four satellites, GPS pseudoranges needs to be augmented with measurements from other sensors, such as a reduced inertial sensor system or RISS. What is the best way to combine the RISS measurements with the GPS measurements? The classic approach is to integrate the measurements in a conventional tightly coupled Kalman filter. But in this month’s column, we look at how a mathematical procedure called parallel case identification can improve the Kalman filter’s job, when navigating with three, two, one, or even no GPS satellites. read more

Spectracom Debuts New GNSS Simulator Capabilities at ION-GNSS

September 21, 2011By

PORTLAND, Oregon — Spectracom announced at the ION-GNSS conference the introduction of new capabilities for its GSG line of GPS GNSS constellation simulators. These features reinforce Spectracom’s offerings for flexible, user-friendly, and affordable characterization and test of GPS and GNSS devices and systems. read more

This article is tagged with , and posted in Design & Test

Innovation: The Right Attitude

September 1, 2011By
Fig1

Experimenting with GPS on Board High-Altitude Balloons
In this month’s column, we look at how a team of Dutch and Japanese researchers is using GPS to determine the attitude of a payload launched from a high-altitude balloon. read more

The System: 2 SOPS Takes Over Second IIF

September 1, 2011By

The U.S. Air Force 50th Space Wing’s 2nd Space Operations Squadron took command and control of the second GPS Block IIF satellite on August 19. SVN-63 (PRN 01) was set healthy on August 23. The total of 12 next-generation GPS IIF satellites built by Boeing will provide improved accuracy through advanced atomic clocks, a longer design life than legacy GPS satellites, and a new signal, L5, that will benefit civil aviation and safety-of-life applications. The Space and Missile Systems Center’s GPS Directorate at Los Angeles Air Force Base remained in control of the satellite during a 30-day on-orbit check-out period before hand off. read more

This article is tagged with , , and posted in Design & Test, GNSS

Expert Advice: Cloud-Based Location Changes Enterprise Playing Field

September 1, 2011By

New technology and wireless carrier openness now make real-time access to telephone location information available to the enterprise with no application required on the mobile device. Yes, that’s right: no application required! Cloud-based location, offered via direct connections to wireless operators, changes the playing field for enterprises to introduce instant operational efficiencies. Marrying location insight, privacy controls, and multi-modal communications through network application programming interfaces (APIs) provides enterprises with flexibility, cost savings, and time-to-market advantages. Whether delivering geo-targeted promotions, dispatching services, verifying worker activities, or performing other location-relevant actions, businesses now have cross-carrier access to location information for more than 85 percent of U.S. wireless subscribers — instantly! read more

This article is tagged with , , , , and posted in Design & Test, Mobile, Opinions

The System: Technical Report on LS/GPS Interference

August 1, 2011By
Delta IV GPS2F-2 Rollback of Mobile Service Tower prior to launc

Once again, developments in the news outpaced print technology’s ability to keep up in the LightSquared saga. Shortly after the July issue went to press on June 27, the TWG final report appeared on June 30. Thus you readers, who received the magazine circa July 15, held old news in your hands. Likely this will occur again. read more

This article is tagged with , , and posted in Design & Test, GNSS

Europe Finds LightSquared Harm to Galileo Signal

July 20, 2011By

The head of the European Commission’s Enterprise and Industry agency has expressed strong official concern about the Lightsquared terrestrial signal. Analysis in Europe shows that transmissions from LightSquared base-stations have considerable potential to cause harmful interference to Galileo receivers. read more

This article is tagged with , and posted in Design & Test, GNSS

Exit COO and President at Harbinger, LightSquared Owner

July 8, 2011By

Harbinger Capital Partners, the hedge-fund firm that owns wireless-network company LightSquared, which recently launched a frontal assault on the GPS signal, announced on July 6 that its chief operating officer (COO) had resigned by “mutual agreement.” Peter Jenson had been responsible for all operational activities of the funds. His exact role in the application for a Federal Communications Commission (FCC) conditional waiver to broadcast a powerful L1 signal from 40,000 U.S.-based terrestrial cell towers is unknown at this time; however, it is certain to have been key. read more

This article is tagged with and posted in Design & Test, GNSS