Transcript Document

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
signals from 150 simultaneously
simultaneous
active beacons
Detection Probability
Message received at MEOLUT
in < 5 min with P > 0.99
< 5 Km with P > 0.95
Location Error Probability
Acknowledgement Data Rate
(Return Link service)
Availability
6 messages of 100 bits each per
minute
99.8%
Refinement of maritime users needs, Brussels December 18, 2002
Galileo satellite with SAR Payload
Navigation antenna
SAR Tx antenna
(L band)
SAR Rx antenna
(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
LUT
Mission
Control
Center
Rescue
Coordination
Center
Rescue
Team
Emergency
beacon
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
( R C C C O S P A S -S A R S A T )
N A V S IS &
S & R m essa ge
(4 )
(5 )
S & R m essa ge
(8 )
(2 )
(1 )
(7 )
\
G a lile o U L S
\
(3 )
M EOLUT
M is s io n C o n tr o l C e n te r
( M C C C O S PA S -SA R SA T )
(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
payload
Navigation
payload
12
1
Galileo Ground
Segment
2
Mission
Up-link
(ULS)
11
Distress Beacon
MGF
ISSS Ground Segment
10
MEOLUT
MCC
MCF
3
RLSP
A
6
D
Nodal MCC
7
C
5
SAR Operators
RCC
8
B
4
9
SPF
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
Lower L-Band
1545 MHz
1544 MHz
Downlink spectrum
Upper L-Band
E
IN TUR
RA
D
A
QU
76
11
2
07
12
4
78
12
6 7
L1
E1
8
FREQUENCY
(MHZ)
75
15
9 10
1591MHz
5
E2
1559MHz
1300MHz
3
1260MHz
1
E6
E5B
1215MHz
1164MHz
IN PHASE
E5A
SAR downlink
L6
Refinement of maritime users needs, Brussels December 18, 2002
GOES
1544 1544.1 1544.2 1544.3 1544.4 1544.5 1544.6 1544.7 1544.8 1544.9 1545
Mobile Satellite Services
Cospas - Sarsat
DASS
Inmarsat
SAR/Galileo
Mobile Satellite Services
Sharing the available downlink spectrum
E2=1559 - 1563 MHz
f (MHz)
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)
(red line
is the current
requirement)
8
6
4
2
0
Average 2D-loc. error [km]
Localisation
of non-GNSS
equipped
Beacons
2D-location error [km]
2D-location error vs time elapsed since transmission [EIRP=23.76 dBW at EOC]
10
0
10
20
30
40
Elapsed time [min]
50
60
0
10
20
30
40
Elapsed time [min]
50
60
6
4
2
0
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