GPS World, April 2011
SYSTEM THE First Overload Interference Desensitization to GPS Receivers Systems and Networks Report to FCC T he joint working group co led by the U S GPS Industry Council and Lightsquared investigating potential problems of LightSquared GPS interference delivered its first monthly report on March 15 as directed by the FCC The report available in full at www gpsworld com firstreport lays out a schedule for receiver selection and testing and names 34 members two working group co chairs and four information facilitators of a technical working group TWG supervising and analyzing the assessment of GNSS receivers operating under conditions of a dense national network of highpowered cell phone transmitters TWG members represent a diverse group of interested parties including equipment and chipset manufacturers aerospace aviation companies wireless providers engineering firms public safety and various federal agencies Additionally several individuals have volunteered to be advisors to the TWG said the report The TWG held its first meeting on March 3 in Arlington Virginia and via a conference bridge for members around the globe who were unable to attend in person In that and subsequent teleconferences the TWG focused on the first seven items from the Work Plan Establish pertinent analytical and test methodologies and assumptions underlying the test regime definition of harmful interference relevant information regarding terrestrial broadband network interference analysis assumptions and evaluation of potential test methodologies Select categories of receivers and receivers to be tested Develop operational scenarios Establish methodology for analyzing test results Derive test conditions based on the established operational scenarios Write test plan and procedures Identify and engage appropriate test facilities LightSquared provided technical details to the TWG regarding the equipment planned for its terrestrial broadband deployment including the channelization plan output power outof band emission OOBE characteristics and emissions mask GPS World April 2011 www gpsworld com 12
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