Bjorn Narheim FFI 2009 Texas III

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Monitoring AIS from Space

Bjorn T Narheim

[email protected]

Oystein Olsen

[email protected]

TEXAS-III

Aug 18 2009



2008 Global AIS Detection Probability

24 hr detection probability for

1 satellite in a 600km polar orbitVessel Distribution Map



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



2009 Vessel Distribution Map

GNP adjusted in missing data areas

2008



2009 Daily Detection Probability Map for

~10 dB CCRR receiver (AISSat-1)

Satellite altitude = 670km

2008




~6 dB CCRR receiver





~6 dB CCRR receiver in 15 years (2%/yr)




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



Norwegian High North viewed from 600km

The focus area for AISSat-1



AISSat-1 Observation of the High North



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



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.



Single Timeslot Collision Rates

³AIS as is´ 3rd frequency



Daily 3rd Frequency Detection Probability

> 98% detection probability

³AIS as is´ in 15 years



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



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



Thank you for listening

Monitoring AIS from Space

Bjørn T Narheim

FFI, Kjeller, Norway

Bjorn Narheim FFI 2009 Texas III

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