AFSPC Briefing Template - Get Now PowerPoint

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					                                        Global Positioning
                                            Systems Wing

                                        GPS Program Update to




                                          Lt Col David B. Goldstein
                                         GPS Wing Chief Engineer
                                                         May 2009

2009 04 29 - GPSW Brief for Italy.ppt
                                                   Agenda


               • Modernization
               • Constellation and Launch Status
               • Cooperation with other GNSS
               • Summary




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2009 04 29 - GPSW Brief for Italy.ppt
                                        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: 24 Mar 09 (IIR-20(M)); 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




                                                                                           3
2009 04 29 - GPSW Brief for Italy.ppt
                                                                                                                                                               GPS – Spectrum
                                                                                                                                                                            Block IIA      Block IIR
                                                                                                                                                                              1990           1997




                                                                          Power Spectrum (dBW/Hz)
                                                                                                             -220                       P(Y)             C/A
                                                   Previous                                                  -230


                                                                                                             -240


                                                                                                             -250

                                                                                                                        1227.6                                  1575.42
 Since Dec 2005                                                                    Power Spectrum (dBW/Hz)   -220
                                                                                                                                       Frequency (MHz)
                                                                                                                                                                                 Block IIR-M, 2005
                                                                                                                                       L2C
     (6 SVs)                                                                                                 -230
                                                                                                                                                M
                                                                                                             -240

                                                       Planned                                               -250

                                                                                                                         1227.6                                 1575.42
                                                                                                                                       Frequency (MHz)
       Power Spectrum (dBW/Hz)




                                                -220

                                                                     L5
                                                                                                                                                                                  Block IIF, 2009
                                                -230


                                                -240


                                                -250

                                                           1176.45                                                       1227.6                                 1575.42
                                                                                                                    Frequency (MHz)
                      Power Spectrum (dBW/Hz)




                                                -220                                                                                                                       L1C    Block III, 2014
                                                -230


                                                -240

                                                -250

                                                           1176.45                                                        1227.6                                 1575.42
                                                                                                                     Frequency (MHz)                                               (artist’s concept)
                                                            L5                                                             L2                                      L1
                                                        RNSS Band                                                   RNSS Band                                  RNSS Band
                                                                                                                                                                                                        4
2009 04 29 - GPSW Brief for Italy.ppt
                                                      GPS – Serving the World

          • Constellation– one of the largest ever - 30
            Operational Satellites
            • 12 Block IIA
            • 12 Block IIR
            • 6 Block IIR-M
          • Most Recent Launch
               • IIR-20(M) – 7th modernized SV
                    • Launched 24 Mar 09
                    • SVN 49 / PRN 01
                    • L5 signal brought into use 10 Apr 09
          • Next Launches
               • IIR-21(M) – Aug 09
               • IIF-1 – Late CY09, Early CY10




                                                                                5
2009 04 29 - GPSW Brief for Italy.ppt
                                                                                         SPS Signal in Space Accuracy
                                                                       N/A    N/A            N/A            N/A   N/A
                                                                  7                                                                    Signal-in-Space User Range
             RMS Signal-in-Space User Range Error (URE), meters



                                                                                                                                       Error is the difference
                                                                                                                                       between a GPS satellite’s
                                                                                                                                       navigation data (position and
                                                                  6                    2001 SPS Performance Standard                   clock) and the truth,
                                                                                         (RMS over all SPS SIS URE)                    projected on the line-of-sight
                                                                                                                                       to the user

                                                                  5
                              RMS SIS URE (m)




                                                                  4
                                                                                       2008 SPS Performance Standard
                                                                                         (Worst of any SPS SIS URE)

                                                                  3


                                                                  2                                                       1.6
                                                                                                                                 1.2      1.1             1.0
                                                                  1


                                                                  0
                                                                      1990   1992          1994            1996   1997   2001   2004    2006            2008
                                                                                    Selective Availability (SA)


                                                       System accuracy exceeds published standard
                                                                                                                                                                        6
2009 04 29 - GPSW Brief for Italy.ppt
                                                L5 Update

• Third civil signal
    • Brought Into Use 10 April 2009
    • Designed to meet demanding
      requirements for transportation safety-
      of-life
    • Initial broadcast of the L5
      demonstration signal was monitored
      and validated




                                                            7
2009 04 29 - GPSW Brief for Italy.ppt
                                        IIR-20 (M) Update (SVN 49 / PRN 01)

        • The GPS IIR-20(M) satellite launched March 24, 2009 is experiencing
          “out of family” measurements discovered April 9, 2009
        • The United States Air Force has formed a response team
          • Currently examining data from the satellite that is not consistent with
            other IIR-M satellite signal performance
        • The response team continues to aggressively work to resolve the
          issue and expects engineering analysis to continue for at least two
          more months
          • The team’s goal is to thoroughly analyze the data to identify root
            cause and a way ahead
        • Worldwide GPS users and the operational satellites are not
          impacted by this problem since this satellite is still in the Early
          Orbit Checkout phase and has not been introduced into the
          operational constellation




                                                                                      8
2009 04 29 - GPSW Brief for Italy.ppt
                                                                   Cooperation with other GNSS

    • GPS is actively engaged with other GNSS
         • To ensure RF compatibility in increasingly crowded GNSS bands
         • To maximize interoperability through use of common civil signals (e.g. L1C)
    • Bi-lateral meetings with Galileo, QZSS, GLONASS, Compass, IRNSS

 Lower L Band                               Upper L Band                                                               S Band
                                                                                                                         2483.5 2500




    GPS                                                                                                GPS
  GLONASS                                                                                            GLONASS
   Galileo                                                                                            Galileo
  COMPASS                                                                                            COMPASS
    QZSS                                                                                               QZSS
   IRNSS                                                                                              IRNSS
    SBAS                                                                                               SBAS

1164 1176.45         1191.795           1207.14 1215     1227.6          1268.52 1278.75   1300   1559   1575.42                1610
                                                       Frequency (MHz)                                     Frequency (MHz)




                                                                                                                                 9
2009 04 29 - GPSW Brief for Italy.ppt
                                                                  Summary

        • GPS has continuously met its commitments to all users
          since FOC in 1995
        • GPS has had multiple operational and acquisition
          successes in the past year
        • Modernization of all GPS Segments is on track
        • Actively working with other GNSS programs




                                        A Commitment of Service
                                                                            10
2009 04 29 - GPSW Brief for Italy.ppt
                                        Questions?




                                                     11
2009 04 29 - GPSW Brief for Italy.ppt

				
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