telemetry uses benefits types - whycos portal (@ wmo) · pdf filetelemetry • uses •...
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Telemetry
• Uses• Benefits• Types
– VHF radio, (UHF)– Satellite receiving– Cellphone & satphone
• Flosys software• Internet data transmission
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Benefits of telemetry
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Benefits of Telemetry• Save time and money in travelling• Know if the station is working correctly• Know if the battery voltage is OK• Know what is happening – flood, low flow,
level, raining, rating change?• Flood warning (or forecasting)• Data users’ needs – as above
– water management for hydro power, water supply, irrigation, pollution detection
– use the data immediately
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-1500
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0
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Dog Is at 09-Oct-2002 07:05:01 NZST
RawTide
03-Oct 04-Oct 05-Oct 06-Oct 07-Oct 08-Oct 09-Oct 10-Oct 11-Oct-02-400
-200
0
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SSIB
Tai Ping (urea carrier)grounding at Bluff
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Types of telemetry transmission
• Landline• Cellphone• VHF or UHF radio• Satellite receiving systems• Satellite phone (satphone)
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Cellphone telemetry
• Can use GSM and GPRS (general packet radio service) - used by Vodaphone & others
• Also CDMA (code division multiple access) -used by Telecom NZ and others
• Hardware - data phones and modems are relatively cheap – well under $NZ 1000
• Costs per call, so expensive if many calls made
• Limited to areas with cellphone coverage
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Cellphone telemetry
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Satellite receiving station telemetry
• Needs to be part of a large established systems mainly through USA
• One-way transmission only (data acquisition)
• Data path usually needs to go through another country
• Tends to be expensive, slow
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Satphone telemetry
• Operation similar to cellphone telemetry but – More expensive - phone hardware and
calls more expensive– Will work from almost anywhere in the
world• Costs are coming down gradually• Some technical issues still, but are
improving
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VHF radio telemetry
• Requires radio system usually with repeaters in required locations
• Repeaters usually expensive - $20,000 upwards
• Economics – use when cheaper methods not possible
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Aquitel
• Developed in NZ in early 1980s
• Still operating well in NZ & Fiji
• Replacement is underway as components now obsolete
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Telemetry: Flosys
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Telemetry: Flosys
• Flosys is a multi-user telemetry system with an integrated database
• It was first deployed in 1981 and has been continuously developed since then
• Flosys is used to telemeter over 1000 stations in New Zealand
• Flosys is developed by NIWA (National Institute of Water and Atmospheric Research).
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Flosys Client
• Flosys Client (also known as Flosys for Windows) allows multi-user access to the telemetry system
• As many people as you want can access and use the telemetry
• Flosys Client has a map based interface to the telemetry
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Flosys data retrieval
• Flosys calls the data logger, if an interrogation fails (due to noise/ interference), the data is retrieved on the next polling
• Data retrieval can be automatic or manual.
• The data since the last call is retrieved. If you call once a day, a whole day of data is retrieved. If you call up every hour, an hour of data is retrieved.
• This results in the data record being continuous
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Dataloggers
Flosys works with, amongst others,
•Unidata
•Campbell Scientific
•Design Analysis Associates (DAA)
•Other brands on request
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Alarms
• Alarms can be triggered by the data logger transmitting an alarm back to Flosys, or by Flosys scanning the retrieved data
• Alarm messages can be sent out to users by
• Text message
• Autodialler
• Over a network to the telemetry client software
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Database
• Data is stored automatically in the Tideda database
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TDServer
• Internet transmission of data
• Can automatically compare and update two Tideda databases via the internet
• Can be used to collect data on one computer and transfer it to another computer anywhere else (connected to internet
• Distance no problem - just needs internet on-line and software
• Many uses – real-time data transfer, data backup, distance no problem