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LightSquared deals with continued GPS interference  (Source:
U.S. officials say no additional testing is needed to prove the existence of harmful interference

A recent government study found that the LightSquared Inc. wireless service interrupted 75 percent of global-positioning system (GPS) receivers.

LightSquared Inc. is a company looking to offer a wholesale 4G LTE wireless broadband communications network with satellite coverage in the United States. It was founded by Philip Falcone and has had interference issues for years now. Just this year alone, interference concerns were raised by the National Telecommunications and Information Administration (NTIA), USAF Space Command, and the U.S. GPS Industry Council.

Now, a test conducted by the U.S. government has shown that 69 of 92 (75 percent) of receivers experienced "harmful interference" at the equivalent of 100 meters from a LightSquared base station. It was deemed that millions of GPS units were incompatible with the LightSquared service, and it could affect cars, planes, boats and tractors.

The test was performed from October 31 to November 4 for the National Space-Based Positioning, Navigation and Timing (PNT) Systems Engineering Forum, which advises policy makers about GPS issues. The Department of Defense and the Federal Aviation Administration took part in the testing, as well as companies like Garmin Ltd., Trimble Navigation Ltd., Deere & Co., and General Motor Co.'s OnStar unit.

"LightSquared signals caused harmful interference to majority of GPS receivers tested," said U.S. officials in a draft prepared for the review of the LightSquared proposal. "No additional testing is required to confirm harmful interference exists."

LightSquared has proposed that it operate at a reduced power than the levels used during the testing. With low power usage, LightSquared believes its services would only affect 10 percent of devices.

Sources: Business Week, SlashGear

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RE: Commi plot to knock out GPS!
By DT_Reader on 12/12/2011 2:39:07 PM , Rating: 0
Someone skimped on their filter design
The GPS receiver folks are the ones who skimped on their filter designs, and now they're claiming their installed base is so large that Lightspeed shouldn't be allowed to go forward. The truth is, they should have to meet THEIR frequency constraints to not be interfered with by Lightspeed.

This is like 1915 Ford saying "OOPS, we made the Model T too wide for the road, but now that there's so many of them we can't/won't share the road with any other vehicles." Lightspeed wants to build motorcycles, but Ford says all they can build are bicycles and they should stick to the sidewalk.

RE: Commi plot to knock out GPS!
By DT_Reader on 12/12/2011 2:39:44 PM , Rating: 2
Excuse me, LightSquared!

RE: Commi plot to knock out GPS!
By Solandri on 12/13/2011 2:36:05 AM , Rating: 4
They did not skimp on the filter designs. LightSquared's spectrum was original allocated for satellite communications. That's what the FCC told everyone the spectrum would be used for, and what the GPS receivers were designed to filter out. Nearly undetectable satellite signals raining down and the occasional satellite dish aimed straight up; not towers every 15 miles blasting away in all directions.

To use your analogy, it's like Ford making cars that fit four abreast on the road. There's also a bike lane on the roads, and LightSquared bought a license to operate bikes in that bike lane. But by asking "nicely", they got the government to approve of them hauling oil tankers down the bike lane.

"And boy have we patented it!" -- Steve Jobs, Macworld 2007

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