Design & Test

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

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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

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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

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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

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Final Report of FCC Working Group: Lose LightSquared from L-Band

July 6, 2011By

“Based on the analysis performed, LightSquared should not be permitted to use the L-Band spectrum for a densely-deployed, non-integrated terrestrial-only network. Such a network would cause unacceptable interference to GPS operations, wiping out an installed base of over 500 million units used in a wide array of public safety, aviation, industrial and consumer applications. While mitigation techniques utilizing filters were discussed in theory, they could not be tested as part of the WG effort because filters do not exist, even in prototypes. No information considered by the WG demonstrated that any mitigation techniques — other than relocation of the proposed terrestrial network to an alternative band — would be successful.” (From the U.S. GPS Industry Council's overview of the WG report) read more

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Innovation: Multipath Minimization Method

July 1, 2011By
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Mitigation Through Adaptive Filtering for Machine Automation Applications
Multipath is real and omnipresent, a detriment when GPS is used for positioning, navigation, and timing. The authors look at a technique to reduce multipath by using a pair of antennas on a moving vehicle together with a sophisticated mathematical model. This reduces the level of multipath on carrier-phase observations and thereby improves the accuracy of the vehicle’s position. read more

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

The System: LightSquared Interference with GPS

July 1, 2011By

And the Beat Goes on Developments in the LightSquared saga came fast and furious in June; highlights are listed below and briefly recapped in the adjacent news story. It will be dated by the time you receive this issue, as it went to press three weeks prior. For current events, see Top Story and Latest News, and the full versions... read more

This article is tagged with and posted in Design & Test, GNSS, Survey, The System, Transportation

Lone Sentinel: Single-Receiver Sensitivity to RF Interference

July 1, 2011By
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Using signal-to-noise measurements from a single commercial-grade L1 GPS receiver, it is possible to detect interference or jamming that is above the thermal noise floor and below a power that causes loss of position. read more

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