Global Positioning Systems Wing GPS Program Update to 49th CGSIC Meeting 21 September 2009 John Langer Technical Director GPS User Equipment Group 2009 09 21 GPSW Update CGSIC v2 Outline Constellation Status System Performance Recent Successes GPS Modernization International Cooperation Support to Civil Users Upcoming Events 2008 09 21 GPSW Update CGSIC v2 2 GPS Constellation
Very robust constellation 30 space vehicles currently set healthy 11 GPS IIA 12 GPS IIR 7 GPS IIR-M 1 GPS IIR-M waiting to be set healthy 3 additional satellites in residual status Global GPS civil service performance commitment met continuously since December 1993 2008 09 21 GPSW Update CGSIC v2 3 Current GPS Accuracy SPS Signal-in-Space (SIS) User Range error (URE) One-year RMS through August 2009: 1.04 meters SPS Zero Age-of-Data (AOD) URE RMS SIS URE (m) Error (URE),
RMS Signal-in-Space User Range meters One-year RMS through August 2009: 0.53 meters 7 N/A N/A N/A N/A N/A Signal-in-Space (SIS) User Range Error (URE) is the difference between a GPS satellites navigation data (position and
clock) and the truth, projected on the line-ofsight to the user 2001 SPS Performance Standard (RMS over all SPS SIS URE) 6 5 2008 SPS Performance Standard (Worst of any SPS SIS URE) 4 3 Decr e erro asing ra r nge 1.6 2
1997 2001 4 Snapshot: Typical UE Horizontal Position Error at 2009-03-13 12:00:00 UEE = 2.6 m Current Typical UE Specification 2008 09 21 GPSW Update CGSIC v2 Max 4.71 m 95th Percentile 3.02 m Median 2.37 m 5 Snapshot: High End UE
Horizontal Position Error at 2009-03-13 12:00:00 UEE = 0.8 m High End UE Specification 2008 09 21 GPSW Update CGSIC v2 Max 2.18 m 95th Percentile 1.29 m Median 0.93 m 6 Recent Successes Space Segment SVN 49 launched in March 09 L5 demo payload secured frequency filing Signal distortion investigation still underway ION panel session Wednesday on SVN-49 SVN 50 launched in August 09 Set healthy
Completed GPS Delta II launches GPS IIF completed Pathfinder testing GPS IIF-1 completed thermal vacuum test & mission assurance review GPS IIIA completed Preliminary Design Reviews 2008 09 21 GPSW Update CGSIC v2 7 Recent Successes (Contd) Ground Segment Delivered new version of OCS (AEP 5.5) to final regression testing with SAASM capability Completed successful OCX, SDR, Modernized Capability Demo and RFP release GAITHERSBURG 2008 09 21 GPSW Update CGSIC v2 8 Recent Successes (Contd)
System Deploying L2C message Type 0 capability for GPS IIRM to support testing of civil UE testing Civil Monitoring Performance Specification (CMPS) 30 Apr 09 L1C phase relationship configuration established L1C components will be in phase with L1 P(Y)-code 2008 09 21 GPSW Update CGSIC v2 9 IIF Pathfinder (May Sep 2009) IIF-2 shipped to Cape for risk mitigation All transport procedures proven successful All mechanical activities performed to plan and facility interfaces verified Consolidated System Testing checked all interfaces to OCS AEP and LADO Cut IIF-1 critical path to launch by 2 months and reduced schedule risk Best Practice for future GPS programs 2008 09 21 GPSW Update CGSIC v2
10 GPS IIF Performance Tech Performance Measure Requirement Current Status L1 C/A User Rec. Pwr. > -158.5 dBW -156.9 L1 P(Y) User Rec. Pwr. > -161.5 dBW -159.9 L1 M User Rec. Pwr. > -158 dBW
-156.3 L2 C User Rec. Pwr. > -160 dBW -159.60 L2 P(Y) User Rec. Pwr. > -161.5 dBW -160.96 L2 M User Rec. Pwr. > -161 dBW -160.56 L5 User Rec. Pwr. > -154.9 dBW
-154.1 Mean Mission Duration > 9.9 years 10.86 SV Reliability > 0.61 0.76090 GPS IIF is meeting or exceeding all specified requirements 2008 09 21 GPSW Update CGSIC v2 11 GPS IIF Summary GPS IIF available for launch in November 2009
New/improved capabilities for civil and military users Reliable sustainment of GPS constellation over the coming years Partnership between GPSW and Boeing continues to focus on mission success 2008 09 21 GPSW Update CGSIC v2 12 Modernization Satellites Legacy (Block IIA/IIR) Basic GPS C/A civil signal (L1C/A) Std Pos. Service Precise Pos. Service L1 & L2 P(Y) nav NDS (Block IIR-M) 2nd civil signal (L2C) M-Code signals (L1M, L2M) Flex A/J power (+7dB)
Control Systems Legacy TT&C L1 & L2 monitoring User Equipment Legacy Man Pack MAGR, PLGR RCVR-3A, 3S OH, UH FRPA, CRPA Upgraded DAGR GAS-1 CSEL MAGR2K GB-GRAM Cornerstones to the Future GPS are GPS III, OCX, & MGUE 2008 09 21 GPSW Update CGSIC v2 13
GPS Modernization New Civil Signals Second civil signal L2C Designed to meet commercial needs Higher accuracy through ionospheric correction 1st launch: Sep 2005 (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 2008 09 21 GPSW Update CGSIC v2 14 International GNSS Coordination GLONASS Galileo Compass
QZSS 2008 09 21 GPSW Update CGSIC v2 IRNSS 15 Support to Civil Users Resident Program Manager for Civil Applications DOT representative located within GPSW Freely available, accurate, and stable documentation Standard Positioning Service Performance Standard (SPS PS) Interface Control Documents (ICDs) / Interface Specifications (ISs) Technical definitions for L1 C/A, L2C, L5, and L1C signals Public Interface Control Working Groups (ICWGs) Insight, access, and influence to ICDs/Iss Special manufacturer/user outreach Developing resolution plans for SVN-49 anomaly 2008 09 21 GPSW Update CGSIC v2
16 Upcoming Events Wednesday, 23 Sep 09 ION panel session dedicated to SVN-49 anomaly Public Interface Control Working Groups (ICWGs) Tuesday, 29 Sep 09 ICWG for IS-GPS-200 Wednesday, 30 Sep 09 In Los Angeles ICWG for IS-GPS-800 Thursday, 1 Oct 09 ICWG for IS-GPS-705 Early 2010 Launch of first IIF satellite 2008 09 21 GPSW Update CGSIC v2 17
The Military GPS Challenge Bring advantages of commercial market to the joint and allied warfighter, and Maintain the advantages of military exclusivity and resistance to electronic attack COTS features 2008 09 21 GPSW Update CGSIC v2 + MIL advantages = Warfighter effectivenes s 18 Solutions
Previous approach (2003): Study commercial devices and levy their benefits as requirements in a traditional military acquisition DAGR Defense Advanced GPS Receiver: All-in-view, Second Generation Security, under 1 lb Pro: Strong military receiver performance Con: Interface and features are quickly outdated Current approach (2012): Develop military components for insertion into COTS or non-COTS systems Common GPS Module (CGM) GPSW Builds Enabling Engines 2008 09 21 GPSW Update CGSIC v2 + Integrators Build Applications =
Global Military GPS Use 19 Keys to the Global Success of GPS Program Stability and Performance Civil service performance commitment met continuously since 1993 Space Segment Continuous improvements in accuracy, availability, etc. Continuity of constellation and signals ensured through Air Force operation and acquisition Funding through U.S. taxpayers Policy Stability and Transparency Open access to civil GPS signals, free of direct user fees Open, free, and stable technical documentation Market-based competition worldwide National-level policy coordination including civil and military leaders Commercial Entrepreneurship and Investment
Control Segment User Segment 2008 09 21 GPSW Update CGSIC v2 20 Summary GPS has continuously met is commitments to all users since FOC GPS has had multiple operational and acquisition successes in the past year Modernization of all GPS Segments is on track Maintaining And Improving GPS Services For All Users Is Job #1 2008 09 21 GPSW Update CGSIC v2 21
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