Satellite Internet Telemetry Options River Water ... Matt Saunders ‐Unidata Pty Ltd. ......
Transcript of Satellite Internet Telemetry Options River Water ... Matt Saunders ‐Unidata Pty Ltd. ......
Satellite & Internet Telemetry Optionsfor
River Water Measurement Systems by
Matt Saunders ‐ Unidata Pty Ltd
Pull and Push Telemetry
• 50 years ago ‐manual reading of level50 years ago manual reading of level
• 30 years ago ‐ data logger records levels and field staff visit to download readings
• 20 years ago dial up modems used and level data was• 20 years ago ‐ dial up modems used and level data was PULLED from the logger via phone line called “dial up networks”
• last 10 years ‐ internet widely available and we can now PUSHdata from logger to central system across the internet usingdata from logger to central system across the internet using “packet networks”
Pull and Push Telemetry
h l / k k b h• Push telemetry / packet networks becoming cheaper
• Use of standard packet data TCP IP/ GPRS/ SMS easier for• Use of standard packet data TCP IP/ GPRS/ SMS easier for network operators than older dial up
• Many different users packet data can be sent across a network at one time hence it is cheaper
• Move from dial up (a special connection for you) to Packet services ( you now share a common packet network with many h )others)
Nature of Internet‐ IP data
• IP data ( TCP / IP) is the standard for the internet and has been widely adoptedwidely adopted.
• Each computer on a network has an IP address, similar to a phone number
• The IP delivery system is a “similar” model to the postsimilar model to the post office and letters
Technology Comparisons TCP / IP versus Short Message Services
TCP/IP i th t d d f th i t t d i t d d li• TCP/IP is the standard for the internet and is guaranteed delivery, each packet is acknowledged / re‐sent if needed
• SMS messages don’t have a guaranteed delivery mechanism
• Some LEO Satellite operators offer SMS like short message services but generally long latency / store and forward systems may take a few minutes to an hour to deliver messageg
TCP / IP‐ UDP Communications/
Protocols and StandardsProtocols and Standards
O ti 1 S d f ll f tt d d t f l• Option 1‐ Send fully formatted data from logger
– Send fully formatted data from logger in the fieldSend fully formatted data from logger in the field
– Easy to format / easy to store but expensive / many wasted formatting characters
/ /– Needs a “ fat / expensive ” pipe from logger / wasted communications costs for satellite connections
Protocols and StandardsProtocols and Standards
O ti 2 S d RAW / d d t f l• Option 2‐ Send RAW / compressed data from logger
– Send raw compressed data from the logger in the field &Send raw compressed data from the logger in the field & reformat messages using an interim server
– Needs a “thin / cheaper” communications pipe from logger
Logger Control& L C t l&
logger
- Compressed Logged Data
Logger Status
ggManagement
Cellular or Satellite Network
Optional Logger Hydro Analysis
Standard Formated CSV
- Compressed Logged Data- Logger Status
Logger Control& Management
- Logger Status ggControl
Management & Message
ReformattingServer
Hydro Analysis ServerASCII DataLogger /
Communications Device
Satellite Communications and T l i i I d T dTelecommunications Industry Trends
• High Population areas will be well served by cellular phone networksp
• No commercial reason to put a cell tower where there are not many peoplewhere there are not many people
• Cellular phone services will be cheaper but hard to get coverage in remote areas
• Satellite services will be higher priced but theSatellite services will be higher priced but the only option for very remote areas
Satellite Communications andSatellite Communications and Telecommunications Industry Trends
• Satellite comms was “ in ” in the 70’s as it was cheaper than old analog coaxial cables
• Optical fiber cables came in in the 80’s and were much cheaper than satellite commsthan satellite comms
• Satellite comms is now a niche in the industry, especially where there is limited infrastructure / in remote areas./
Satellite Communications Technology Considerations
• Geostationary Satellites– One “parked” satellite 50,000 km above the equator &
orbits the earth at the same speed as the earth rotates so appears to be stationary.
• Low Earth Orbit SatellitesM biti t llit 1000 k b th th diff t– Many orbiting satellites 1000 km above the earth, different orbits, like a set of orbiting cell towers. Fast orbits, once per hour around the world.
Satellite Communications
Equatorial Orbit Satellites
Leo and Geo SatellitesSatellites
Low Earth Orbit SatellitesSatellites
Satellite Communications Geo Satellite over Australia
Satellite Communications Leo Satellites over Australia
Low Earth Orbit Satellite
Leo Satellites over Australiawith Local Ground Station Support
Low Earth Orbit Satellite
UserUser
UserLow Earth Orbit S lli
Low Earth Orbit Satellite
User
UserUserUser
Satellite Control & Management Ground Station
Satellite Control & Management Ground Station
Satellite
Low Earth Orbit Satellite Low Earth Orbit
Satellite
Satellite Communications Leo Satellites around the World
with one USA based Ground Stationwith one USA based Ground Station
LEO and GEO Satellites ‐ Flat plainsLEO and GEO Satellites ‐ Flat plains
LEO and GEO Satellites ‐ Hills and valleys
Satellite Communications Technology Considerations
• Geostationary Satellitesalways available / excellent service– always available / excellent service
– long ( 250ms) delay to satellite and back
– high power needs / a long way awayg p g y y
– remote units probably cant survive on battery only, best to have external power available
• Low Earth Orbit Satellites– only available when a satellite is overheadonly available when a satellite is overhead
– short ( 10ms) delay to satellite and back
– low power needs / quite close in
– remote units can survive on battery only
Examples of Satellite Services
• Thuraya Equatorial
• Inmarsat‐ Equatorial
• GOES‐ Equatorial and Polar
• Iridium‐ LEO
• Orbcom‐ LEO
• Globalstar‐ LEO
Thuraya Equatorial
Inmarsat Equatorial
GOES Equatorial and Polar
Iridium LEO
Globalstar LEO
Globalstar LEO
Orbcom LEO
Leo Satellite Examples in Canada
NRT S t llit it k d it th• NRT Satellite units work despite the tree coverage.
NRT S t llit d i ll f• NRT Satellite design allows for regular satellite visibility checking and programmable retry intervals
• NRT Satellite fast transfer when a satellite is acquire
• Operation OK in areas where satellite visibility is partially restrictedrestricted
Typical Installation‐ Leo Satellite
Typical Installation –Leo Satellite
Typical Installation‐ Leo Satellite
More Information & Follow‐up
• Brochures – available from web site.Brochures available from web site.
Q ti ?• Questions?
– (+61) 08 9331 8544( )