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 “Military Control of GPS”.
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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?