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					Refinement of maritime users needs, Brussels December 18, 2002




The Galileo support to the Search
    and Rescue Programme
          (SAR/Galileo)
     Refinement of maritime users needs, Brussels December 18, 2002

                         Outline
How SAR/Galileo integrate with Cospas-Sarsat service?

             SAR/GALILEO ARCHITECTURE

             GROUND SEGMENT CONCEPT

             DOWNLINK COORDINATION

 Does improvement of location of alerts imply that ship
borne EPIRBs be fitted with GNSS receiver?

             SAR/GALILEO EXPECTED SERVICE PERFORMANCE

 Does the implementation of the return link imply that ship
borne EPIRBs be fitted with GNSS receiver?
   Refinement of maritime users needs, Brussels December 18, 2002

                    SAR/Galileo MISSION REQUIREMENTS
                                and BENEFITS

 FULL BACKWARD COMPATIBILITY WITH COSPAS-SARSAT SYSTEM

 ENHANCEMENT OF EXISTING SAR AIDED TRACKING SYSTEM:

      - IMPROVEMENT OF PERFORMANCE:
           Multi satellite visibility
           Quasi real-time distress detection
           Increased distress location accuracy

      - INTRODUCTION OF NEW SERVICES:
            Implementation of a return link

 FACILITATING LOW-COST SAR USER EQUIPMENT WITH INTEGRATED
GALILEO RECEIVERS (« ADVANCED BEACONS »)
       Refinement of maritime users needs, Brussels December 18, 2002


Support to Search And Rescue Services



  Capacity                              Each satellite capable to relay
                                                          simultaneously
                                        signals from 150 simultaneous
                                        active beacons
  Detection Probability                 Message received at MEOLUT
                                        in < 5 min with P > 0.99
  Location Error Probability            < 5 Km with P > 0.95

  Acknowledgement Data Rate             6 messages of 100 bits each per
  (Return Link service)                 minute
  Availability                          99.8%
      Refinement of maritime users needs, Brussels December 18, 2002

Galileo satellite with SAR Payload




Navigation antenna                   SAR Tx antenna   SAR Rx antenna
                                     (L band)         (406 MHz)
        Refinement of maritime users needs, Brussels December 18, 2002
Integration of the MEOSAR component in the International SAR Satellite System



                                                                                             GEO
                                                                                           Satellites




                                                              MEO
                                                            Satellites
     1544MHz                                                                              406 MHz
                                               LEO
                                             Satellites


                                                                                Rescue
    LUT                                             Rescue                      Team
                       Mission                                                           Emergency
                       Control                    Coordination
                                                                                         beacon
                       Center                       Center
 Refinement of maritime users needs, Brussels December 18, 2002

                   Se a r ch                         &            R e scu e
                             A r ch i t e ct u r e
            G a lile o M E O
                    \


                                                         R e s c u e C o -o rd in a tio n C e n tre
N A V S IS &                                                      ( R C C C O S P A S -S A R S A T )   (4 )
                                                                                                       (5 )
S & R m essa ge
                                              S & R m essa ge
                    (8 )

                                              (2 )
            (1 )
                                   (7 )



                                                                                         M is s io n C o n tr o l C e n te r
                                     \                              \          (3 )
                                                                                           ( M C C C O S PA S -SA R SA T )
                           G a lile o U L S                  M EOLUT
                                                           (C O S P A S -S A R S A T )
                                                                                                              (3 )


                                                                     (6 )
        \
S & R -te r m in a l        G a lile o \C o n tr o l
                                   C e n tr e
     Refinement of maritime users needs, Brussels December 18, 2002

                  SAR/Galileo Interfaces and Data Flow

                       13
                                        Galileo Space Segment
                                              SAR               Navigation
                                             payload             payload                12


                       1
                                                                                                 Galileo Ground
                                                                                                   Segment
                                         2
                                                                                             Mission
                                                                                             Up-link
                                                                                             (ULS)
Distress Beacon                                                                                     11
                                                                                                 MGF
                                    ISSS Ground Segment
                                                                                                    10
                   MEOLUT                     MCC                                                MCF
                                    3
                                                                             RLSP
                                                                                             A           9
                                                  6
                            D                                   7                   8
                                         Nodal MCC                                               SPF
                            4                                                       B
                                                                C
                                5
       SAR Operators


     RCC
   Refinement of maritime users needs, Brussels December 18, 2002

   SAR/Galileo Ground Segment concept


 SAR/Galileo CONCEPT   WILL    FACILITATE  INTERNATIONAL
COOPERATION FOR THE PROVISION OF THE GROUND SEGMENT:

       - MEOLUT COVERAGE:
       Six MEOLUTs are sufficient for global coverage

       - OMNI DIRECTIONAL ANTENNA MEOLUT:
       Simple concept, should reduce implementing costs and facilitate
       operations

 SAR/Galileo RETURN LINK OPERATIONS REQUIRE THE DETAILED
DEFINITION OF INTERFACES BETWEEN THE GALILEO GROUND
SEGMENT AND THE SAR OPERATIONAL GROUND SEGMENT
Refinement of maritime users needs, Brussels December 18, 2002
Coverage area of a MEOLUT

Common visibility between the beacon and the MEOLUT for 100% of the time of at least N satellites




Coverage: localisation inside REQs  5,000 Km radius
             Refinement of maritime users needs, Brussels December 18, 2002


                                             Downlink spectrum




                                                                                                               1544 MHz


                                                                                                                                         1545 MHz
                                                                       Lower L-Band                                                                        Upper L-Band
                                                                                                                          L6
                                    E5A            E5B                                         E6                                                    E2          L1       E1




                                                                                                                          SAR downlink
             IN PHASE




                                                                                                                                           1559MHz




                                                                                                                                                                               1591MHz
                        1164MHz




                                                                                1260MHz




                                                                                                         1300MHz
                                                             1215MHz
                                         1               3                                5
                                                                                                                                                                         8



                                                                                                     FREQUENCY
        RE
  AD IN




                                                                                                78
      TU




                                                    07
                                    76




                                                                                                     (MHZ)
                                                                                              12
                                                  12
                                  11
    RA




                                    2                    4
QU




                                                                                              6 7                                                                 9 10




                                                                                                                                                            75
                                                                                                                                                          15
Refinement of maritime users needs, Brussels December 18, 2002

                                                   Sharing the available downlink spectrum




                                                                                                        Mobile Satellite Services
 Mobile Satellite Services




                                     SAR/Galileo


                                                     Inmarsat




                                                                                             DASS
                                                                Cospas - Sarsat
                                                                                                                                    E2=1559 - 1563 MHz

                                                                     GOES




                                                                                                                                       f (MHz)
                             1544 1544.1 1544.2 1544.3 1544.4 1544.5 1544.6 1544.7 1544.8 1544.9 1545
     Refinement of maritime users needs, Brussels December 18, 2002

SAR/Galileo expected performance (number of satellites in view)

                     Beacon localisation error for 3 to 6 MEOs in common view
                 Refinement of maritime users needs, Brussels December 18, 2002
         SAR/Galileo expected performance (evolution with time)

                                                                       2D-location error vs time elapsed since transmission [EIRP=23.76 dBW at EOC]
                                                                       10




                                       2D-location error [km]
                                                                                8
Localisation
of non-GNSS                                                                     6
equipped                                                                        4
Beacons
                                                                                2
(red line
                                                                                0
is the current                                                                      0   10      20           30         40         50          60
requirement)                                                                                         Elapsed time [min]
                                                                                6
                                                   Average 2D-loc. error [km]




                                                                                4


                                                                                2


                                                                                0
                                                                                    0   10      20           30         40         50          60
                                                                                                     Elapsed time [min]
         Refinement of maritime users needs, Brussels December 18, 2002

                                        Summary and conclusion (1/2)

• SAR/Galileo will be the European MEOSAR component for the support to the International Search and
Rescue Programme
•The MEO constellation is a unique opportunity to improve the existing international SAR system : permanent
availability of space segment; favourable space to Earth geometric configurations, synergy with the navigation
information.
•Several MEO initiatives are been considered alongside Galileo: GPS / SAR and GLONASS/ SAR
       Refinement of maritime users needs, Brussels December 18, 2002

                                     Summary and conclusions (2/2)


•SAR/Galileo service will provide an enhanced support by:
     • Near real-time alert localisation and message detection
     • Higher beacon localisation error (below 2 Km average in less than 5 min)
     • Return link service (false alert rate reduction)
     • High availability
     • Global coverage
     • Ground segment concept will simplify operations

				
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posted:10/19/2012
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