Panel 1 NPECAB. September 2007. Leadership Panel, Issue 1 Remove S/A Capability from System. Background Removal has been urged by independent Panels for over 10 years Capability is trivially defeated by GPS differential Systems (WAAS, NDGPS, etc.) It Flags the â€œMilitary Control of GPSâ€.
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The Good News: It was Officially removed by Secretary England at the urging of Dr. Schlesinger and announced 18 September 2007
2 Degree Mask Angle
Standard 24 Satellite Constellation
Three of top four Goals are driven by the number of satellites – hence DSB & IRT
30+X satellite recommendation
It is imperative the we avoid “GPS Brownouts”
Needed: Sustained, high-level supportfor earlier GPS III delivery and availability
Monthly Availability of 24 sats 92 to 100%
DOP vs. Mask Angle (degrees) (June 6 2006)
RAIM – Receiver Autonomous Integrity Monitoring - Use of more than minimum (4) satellites to determine the navigation signal is within normal error bounds
A 10 degree mask angle is totally unrepresentative of mountains or urban areas
Clear Need for
“Specified”Constellation of > 30 Satellites
Landing & ADS-B Integrity
Meet orExceed Current Capability
Or Inevitable Brownouts?
The PriceMust be Affordable
Cost perSatelliteon Orbit
Battleship Galactica orAffordable First Step?