SOT Geneva 2007 Iridium: low power satellite communications for autonomous instruments David Meldrum...
31
SOT Geneva 2007 Iridium: low power satellite communications for autonomous instruments David Meldrum Scottish Association for Marin Science
-
Upload
patrick-dillon -
Category
Documents
-
view
222 -
download
6
Transcript of SOT Geneva 2007 Iridium: low power satellite communications for autonomous instruments David Meldrum...
SOT Geneva 2007
Iridium: low power satellite communications for autonomous instruments
David MeldrumScottish Association for Marine Science
SOT Geneva 2007
• General considerations• Iridium overview• SAMS experience with Iridium• Future plans
SOT Geneva 2007
General considerations• Bandwidth• Timeliness• Availability• Polar coverage• Temperature spec• Cost
• Energy• Cash
• Physical size• Reliability• Future• Technical support
SOT Geneva 2007
A common misbelief when things don’t work as they should…
• ‘The system operators know about it and are doing something to fix it’
• WRONG on both counts!• The system wasn’t designed with
your application in mind• You are a very minor user• You are a pain in the neck
SOT Geneva 2007
Satcom systems available globally to platform operators
Inmarsat D+ Pager GEO < 1 kbyte/day
GOES, Meteosat
Messaging
GEO < 5 kbyte/day
Argos Messaging
LEO < 5 kbyte/day
Inmarsat C Messaging
GEO < 10 kbyte/day
Orbcomm Messaging
LEO < 50 kbyte/day
Iridium Voice Big LEO
1 Mbyte/hr
Globalstar Voice Big LEO(regional)
1 Mbyte/hr
Inmarsat BGAN
Internet GEO 50 Mbyte/hr
SOT Geneva 2007
Low Earth Orbit and Geostationary Earth OrbitField of View for LEO (Iridium) and GEO (Inmarsat)
SOT Geneva 2007
Typical LEO polar orbit
SOT Geneva 2007
Satcom systems available globally to platform operators
Inmarsat D+ Pager GEO < 1 kbyte/day
GOES, Meteosat
Messaging
GEO < 5 kbyte/day
Argos Messaging
LEO < 5 kbyte/day
Inmarsat C Messaging
GEO < 10 kbyte/day
Orbcomm Messaging
LEO < 50 kbyte/day
Iridium Voice Big LEO
1 Mbyte/hr
Globalstar Voice Big LEO(regional)
1 Mbyte/hr
Inmarsat BGAN
Internet GEO 50 Mbyte/hr
SOT Geneva 2007
Satcom systems available to POLAR platform operatorsArgos Messagin
gLEO < 5 kbyte/day
Iridium Voice Big LEO
1 Mbyte/hr
• Argos: 6 sats, 400 bits/s (will increase)• Iridium: 66 sats, 2400 bits/s (will
increase)
SOT Geneva 2007
Iridium overview
• Designed as a phone system: 2-way, real-time• 24/7 availability, true global coverage
• 66 satellites• Inter-satellite links pass traffic to ground station
• Basic data rate 2.4kbps• Various modes of access
• Dial-up (better for larger file sizes)• Short Burst Data, SBD (up to 2 kbyte per message)• Future ‘near broadband’ service , ~100kbps
• Platform location• GPS• Km-scale accuracy Iridium location in SBD
SOT Geneva 2007
Iridium constellation
SOT Geneva 2007
Network Architecture
AZ, HI or AK
InternetNIPRNET
SBD, SMS(e-mail)
RUDICSServer
IP Address
PSTN
Landline Modem
AZ, HI or AKAZ, HI or AKAZ, HI or AK
InternetNIPRNET
SBD, SMS(e-mail)
RUDICSServer
IP Address
PSTN
Landline Modem
InternetNIPRNETInternetNIPRNETInternetNIPRNET
SBD, SMS(e-mail)
SBD, SMS(e-mail)
RUDICSServer
IP Address
RUDICSServer
RUDICSServer
IP Address
IP Address
PSTN
Landline Modem
PSTN
Landline Modem
PSTNPSTN
Landline ModemLandline Modem
Dial-up Data (DAV)Direct Internet SBDSMSRUDICS
Dial-up Data (DAV)Direct Internet SBDSMSRUDICS
Dial-up Data (DAV)SMSDial-up Data (DAV)SMS
Iridium overview
SOT Geneva 2007
Dial-up: on-line session with mobile
Welcome to the SAMS Iridium host! First name: DAVID Last name: MELDRUM Password: ******** F)iles U)pload D)ownload H)elp T)ime C)hat R)ead mail L)eave mail G)oodbye Your choice? F Enter file spec: (carriage return = *.*) > *.jpg IMAGE01.JPG 42943 11/04/03 17:08 IMAGE02.JPG 85160 11/04/03 17:09 IMAGE03.JPG 172340 11/04/03 17:12 IMAGE04.JPG 245160 11/04/03 17:16 F)iles U)pload D)ownload H)elp T)ime C)hat R)ead mail L)eave mail G)oodbye Your choice?
SOT Geneva 2007
Transfer times for 37kbyte file
108 110 112 114 116 118 120 122 124 126 128 130 132 134 136 138 140
S1
S3
0
50
100
150
200
250
300
350
Time(s)
Mode -> 3100 bps
>4000 messages
SOT Geneva 2007
Short Burst Data Pathways
• Simple AT commands
IRIDIUM NETWORK
IRIDIUM NETWORK
INTERNET
INTERNET
SENSOR
USER
MODEMTX Buffer
RX Buffer
+SBDWB
+SBDRB+SBDI
SOT Geneva 2007
Example e-mail received by user (MO message)
From: <Iridium SBD Service (Tempe, AZ)>
Sent: Tue, 23 Sep 2003 22:02:24
Subject: SBD Msg From Unit: 300090807080903
MOMSN:152
MTMSN:0
Session Status: TRANSFER OK
Message Size (bytes): 1960
Unit Location: Lat = 56.457321 Long = -5.458788
CEPradius = 2
Message is attached.
SOT Geneva 2007
Email delivery time
0
100
200
300
400
500
600
14 16 18 20 22 24 26 28 30 32 34secondsseconds
SBD Delivery Latency
SOT Geneva 2007
Network Traffic
May 2006130,000 commercial users30,000 DoD users
Iridium traffic
SOT Geneva 2007
Current constellation
SOT Geneva 2007
Replenishment plans
Replenishment Program Summary
CY 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
Satellite Replacement ProfileFailures 0 1 1 1 0 1 1 2 1 1 1 1 2 2 2 4 5 5 5
Original Orbit Spares 14 13 12 11 11 10 9 7 6 5 4 3 1 -1 -3 -7 -12 -17 -22Replacements 2 4 2 2 4 4 6 4
Total Spares 14 13 12 11 11 10 9 7 6 5 4 5 7 7 7 7 6 7 6Cum Replacements 2 6 8 10 14 18 24 28
Number of Launches 1 2 1 1 2 2 3 2
2008 2009 2010 2011 2012 2013 2014 2015 2016
Requirements and Supplier Selection
Satellite R&D
Satellite PDR
Deploy & Launch Satellites ...
2017
1st Launch 2 Satellites
Satellite Qualification
Calendar Year...
SOT Geneva 2007
Iridium ballpark costs
• Dial-up + SBD modem: $1000• SBD-only modem: $400• Monthly fee: $14 - $30• Call costs: ~$1 per minute
• $0.1 per kbyte for files > few kbyte
• Data costs: ~$1.50 per kbyte
SOT Geneva 2007
SOT Geneva 2007
dalriada.nsm.ac.uk/php
SOT Geneva 2007
Temperature record
SOT Geneva 2007
New suitcase buoys: GPS only
SOT Geneva 2007
9601 (‘Taladega’) SBD modem
SOT Geneva 2007
SOT Geneva 2007
SAMS future plans:Solar powered Iridium drifters
• Transparent hulls from Technocean
• Solar panel equatorial plane• SVPB sensor fit• Li-ion batteries• Iridium 9601 + GPS• Extensive diagnostics• Participation in DBCP Iridium
pilot programme….
SOT Geneva 2007
DBCP future plans
• Iridium Pilot Project (Iridium-PP)• Practical evaluation in realistic
conditions• Small platforms• Wide partnership• Support (cash and in-kind) by
Iridium, manufacturers and DBCP• Open membership
SOT Geneva 2007
Iridium-PP mailing listLogin Pref Your subscriptions Home Help
Communication for the DBCP Iridium Pilot Project Participants
List info
Subscribers: 30 Owners Hester Viola Moderators [email protected]
Subscribe
Unsubscribe
Archive
Post
Shared web
Email Communications list for a Pilot Project looking at use of Iridium Satellite Communications for the Data Buoy Cooperation Panel
SOT Geneva 2007
![· SHIM SACD Dire Straits rLove Over Gold] (Private Investigations) ' Clear Cygnus SACD ' , IRIDIUM , IRIDIUM , IRIDIUM 11.5 AWG , , PFA 3455R IRIDIUM Clear Cygnus , 5 Trigon Exxpert](https://static.fdocuments.net/doc/165x107/60d04de1d6909b691a4f38e7/shim-sacd-dire-straits-rlove-over-gold-private-investigations-clear-cygnus.jpg)