GPS Status and Modernization Munich Satellite Navigation Summit Munich, Germany 3 March 2009 Colonel David Buckman, US Air Force PNT Command Lead Air Force Space Command This briefing is for information only. No US Government commitment to sell, loan, lease, co-develop or co-produce defense articles or provide defense services is implied or intended. Overview GPS Overview Recent Events Modernization Improvements Summary 2 GPS Constellation Six planes 55o inclination 20,000 km altitude
12-hour orbits Twenty-four primary slots 3 GPS Ground Segment S-Band L-Band MCS at Schriever AFB, CO & Alternate MCS at VAFB Vandenberg AFB Greenland 16 Monitor Stations 6 OCS + 10 NGA 12 Ground Antennas 4 GPS + 8 AFSCN New Boston Guam GAITHERSBURG
MCS Master Control Station Schriever AFB AMCS Alternate MCS Vandenberg AFB GPS Ground Antennas AFSCN Remote Tracking Stations 4 GPS Serving the World Constellation the largest ever - 31 Healthy Satellites 13 Block IIA 12 Block IIR 6 Block IIR-M 31st satellite, SVN 23, set healthy, achieved 31 healthy satellite constellation for first time ever Most Recent Launch
IIR-19(M) 6th modernized SV Launched Wednesday, 15 Mar 08 SVN 48, PRN 7 Set healthy on 24 Mar 08 Next Launches IIR-20(M) Mar 09 L5 demo payload IIR-21(M) Aug 09 IIF-1 Oct 09 5 SPS Signal in Space Performance System accuracy exceeds published standard 6 GPS Modernization Program Increasing System Capabilities Increasing Defense / Civil Benefit
Block IIA/IIR Block IIR-M, IIF Block III Basic GPS Standard Service Single frequency (L1) Coarse acquisition (C/A) code navigation Precise Service Y-Code (L1Y & L2Y) Y-Code navigation IIR-M: IIA/IIR capabilities plus 2nd civil signal (L2C) M-Code (L1M & L2M) Backward compatibility 4th civil signal (L1C) 4x better User Range error than IIF Increased availability Increased integrity IIF: IIR-M capability plus 3rd civil signal (L5) 2 Rb + 1 Cs clocks
12 year design life 7 GPS Modernization New Civil Signals Second civil signal L2C Designed to meet commercial needs Higher accuracy through ionospheric correction 1st launch: Sep 2006 (GPS IIR-M); 24 satellites: ~2016 Third civil signal L5 Designed to meet demanding requirements for transportation safety-of-life 1st launch: ~ 2009 (GPS IIF); 24 satellites: ~2018 Fourth civil signal L1C Designed with international partners for GNSS interoperability Begins with GPS Block III 1st launch: ~2014; 24 satellites: ~2021 8 Power Spectrum (dBW/Hz)
GPS Spectrum Previous P(Y) -220 Power Spectrum (dBW/Hz) Planned C/A -240 -250 -220 1575.42 Frequency (MHz) L2C -230 M -250
Frequency (MHz) 1575.42 Block IIF, 2009 -220 L5 -240 -250 1176.45 1227.6 Frequency (MHz) 1575.42 -220 Power Spectrum (dBW/Hz) Block IIR-M, 2005 -240 1227.6 -230
Block IIR 1997 -230 1227.6 Since Dec 2005 (6 SVs) Power Spectrum (dBW/Hz) Block IIA 1990 L1C Block III, 2014 -230 -240 -250 1176.45 L5 RNSS Band 1227.6 Frequency (MHz)
L2 RNSS Band 1575.42 L1 (artists concept) RNSS Band 9 GPS Modernization Ground Architecture Evolution Plan (AEP) Transitioned in 2007 Modern distributed system replaced 1970s era mainframe Increased capacity for monitoring of GPS signals to 100% worldwide coverage (was 96.4%) and have 99.8% of world double covered Increased worldwide commanding capability from 92.7% to 94.5% while providing nearly double the backup capability Next Generation Operational Control Segment (OCX)
Enables modernized messaging Controls more capable GPS constellation Monitors all GPS signals Two development contracts awarded Nov 07 Down select of contract in 2009 10 Summary Largest constellation in history with best accuracy ever Modernized Command and Control System allows more signal monitoring and quicker satellite commanding than ever before And were continuing to modernize and improve GPS even more! GPS Serving the World 11
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