Javad Ashjaee to Discuss JAVAD GNSS LightSquared Tech at December 8 Webinar
November 22, 2011At the November 9 meeting of the National Space-Based Position Navigation and Timing (PNT) Advisory Board, Javad Ashjaee, president and CEO of JAVAD GNSS, demonstrated his company’s newly developed filter technology proposed to protect GPS receivers from LightSquared broadband network interference. In a December 8 GPS World webinar, Ashjaee gives this presentation for GPS World's web audience, and answers questions from the magazine's survey editor, Eric Gakstatter.
The webinar will begin at 10 a.m. Pacific and 1:00 p.m. Eastern Standard Time.
The JAVAD GNSS proposed fix consists, in simplified form, of a ceramic filter followed by a series of surface acoustic wave (SAW) filters. Mr. Ashjaee will explain how it works, and show some test results. Mr. Gakstatter will provide further commentary and questions. We will also take questions from the web audience.
Ashjaee stated at the National PNT Advisory Board meeting that his company’s testing of the filter methodology found no GPS signal loss due to a low-10 (10L) signal power of -10 dBm. He recounted what he called “The Ultimate Test: Special Zero Baseline,” placing receivers on a Moscow skyscraper with multipath from both above and below. One antenna fed two receivers (zero baseline). One receiver used standard filtering and the other the new filters. He stated that over 15 hours of testing, the average carrier-phase error between the two receivers was 0.2 millimeters and the average code difference was about 5 centimeters.
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