Recent tests “did show that LightSquared signals caused harmful interference to the majority of other tested general-purpose GPS receivers,” according to a statement issued yesterday by Anthony Russo, director of the National Coordination Office, on behalf of the National Executive Committee for Space-Based Positioning, Navigation and Timing.
LightSquared is coming under pressure from several separate directions, as opponents to its plans provide more specific support to their positions on legal, financial and technical issues. And in the background, a telecom industry heavyweight with whom LightSquared hopes to form an alliance wants clarity by year-end.
The Coalition to Save Our GPS sent a letter today to the FCC asking the agency to “promptly rule” that LightSquared be barred from using the upper mobile satellite spectrum (MSS) band for high-powered terrestrial operations.
After LightSquared made statements that it has a “legal right” to build a network of terrestrial 4G broadband transmitters in the U.S., the Coalition to Save Our GPS last Thursday stepped up its attack of the company’s plans.
Clearly impatient with the way the company’s plan for its nationwide broadband Internet project is becoming further and further delayed by opposition from the GPS user community, several federal government departments, members of Congress and, reportedly, within the FCC bureaucracy itself, a LightSquared
To the puzzlement of the GPS community and independent radio propagation experts, the FCC ruled on September 13 that LightSquared should conduct further tests of its signal transmissions on its alternate, lower L-band frequency farther removed from the GPS frequency. Tests on a LightSquared frequency closer to GPS earlier this year produced extreme interference.
LightSquared signed an agreement yesterday with Javad GNSS to develop a system that it claims will eliminate related interference issues between LightSquared’s planned 4G broadband network transmitters and high-precision GPS devices.
A confidential briefing on the LightSquared/GPS situation presented by Gen. William Shelton, chief of the Air Force Space Command, to senior staff at the Department of Defense and the White House Office of Management and Budget (OMB) was promptly leaked to LightSquared.
On Tuesday, the FCC approved LightSquared’s fallback plan to move from a frequency close to that of GPS in the upper L-band–where tests had shown severe interference–to a lower 10-MHz portion of the same spectrum where reduced interference was expected.
Possibly recognizing that the July 1 final report on GPS testing showed that interference was worse than predicted, LightSquared lawyers are now bypassing the FCC and submitting technical papers directly to the UN’s International Telecommunications Union (ITU) in Geneva, according to published reports.