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Monitoring AIS from Space
Bjorn T Narheim
Oystein Olsen
TEXAS-III
Aug 18 2009
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2008 Global AIS Detection Probability
24 hr detection probability for
1 satellite in a 600km polar orbitVessel Distribution Map
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2009 Simulation Improvements
� Improved Global AIS VesselDistribution Map
± Using AIS Base Station data tomore accurately separate non-
moving, coastal and oceancrossing vessels
� Two refined AIS receiver modelswith different CCRR
± Standard ~10 dB CCRRreceiver
± Signal digitizer with signalprocessing giving ~6 dB CCRR
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2009 Vessel Distribution Map
GNP adjusted in missing data areas
2008
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2009 Daily Detection Probability Map for
~10 dB CCRR receiver (AISSat-1)
Satellite altitude = 670km
2008
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2009 Daily Detection Probability Map for
~6 dB CCRR receiver
Satellite altitude = 670km
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2009 Daily Detection Probability Map for
~6 dB CCRR receiver in 15 years (2%/yr)
Satellite altitude = 670km
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AISSat-1 Demonstration Satellite
20x20x20cm body, 85cm tall, 75cm wide
AIS Sensor built by the Kongsberg Group, Norway
Platform built by Space Flight Laboratory at UTIAS, Canada
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Norwegian High North viewed from 600km
The focus area for AISSat-1
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AISSat-1 Observation of the High North
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AISSat-1 Daily Observations Map
~10 dB CCRR receiver
Number of daily observations at >95% detection probability
for 1 satellite in a 600km polar orbit
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For the 3rd Frequency
� The updated global vessel distribution shows less vessels in the
open oceans thereby easing the detection of vessels in these
areas for both ³AIS as is´ and for a 3rd AIS frequency.
� There are, however, dense traffic areas that would benefit a lotfrom a 3rd AIS frequency (Europe, Gulf of Mexico, Far East).
� A 3rd frequency exclusively for satellite AIS (ex: ch 75, 76) would
remove the current land mobile interference problem on the AIS1
and AIS2 frequencies.
� A 3rd AIS frequency would better absorb future traffic growth.
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Single Timeslot Collision Rates
³AIS as is´ 3rd frequency
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Daily 3rd Frequency Detection Probability
> 98% detection probability
³AIS as is´ in 15 years
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3rd Frequency Daily Observations Map
~10 dB CCRR receiver
Number of daily observations at >95% detection probability
for 1 satellite in a 600km polar orbit
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20052005 20062006 20072007 20082008 20092009 20102010 20112011 20122012 20132013
Modelling
Phase A
Aircraft
tests
TRP
EQM
Phase B/C/D
FlightDesign & Build
Flight
AISSat-1
AISSat-2
COLAISProcurement Operation
SMRS IOD
Preparation
Flight
17
Road map to a space-based AIS system
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Thank you for listening
Monitoring AIS from Space
Bjørn T Narheim
FFI, Kjeller, Norway
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