HRIT/EMWIN
Wednesday, March 16, 2016
Santos Rodriguez
NWS EMWIN
Outline
• EMWIN Brief Description
• LRIT Brief Description
• Satellite Transitions and Effects
• Aerospace EMWIN/HRIT Prototype
What is EMWIN?
• The Emergency Managers Weather Information
Network is a low cost, priority-driven weather
data broadcast service that provides one of the
most robust NWS systems for public weather
dissemination
• EMWIN provides rapid Satellite, VHF Radio, and
Internet dissemination of:
– Alerts/Watches/Warnings < 1 minute
– Forecasts
– Graphics, Imagery
How EMWIN Works
• Data is collected from the NWS Gateway, Weather
Wire and the Internet
• Assembled and prioritized
• Sent to NESDIS, (Wallops CDA) where it is uplinked to GOES 11 and GOES 12
• Sent further west via “Peace Sat” (NOAA donated
GOES-7) in a cooperative effort between NWS
Pacific Region and the Univ. of Hawaii
• Transmitted via VHF radio (local re-broadcast) in
some areas
• Sent on the Internet via IP unicast
EMWIN User Receive System
“Screen Shots”
Learn More
• For more information on EMWIN, future
developments or possible vendor opportunities
please check with the EMWIN team or the
EMWIN website at:
http://www.weather.gov/emwin/index.htm
What is LRIT?
• The Low Rate Information Transmission
• Re-broadcast of Environmental Data through
GOES East and GOES West
• GOES Imagery
• Environmental Products
• EMWIN Re-broadcast
• GOES Data Collection System (DCS)
• Digital Format
• CGMS LRIT/HRIT Global Specification
• Relatively Lower Cost Alternative
How LRIT Works
• GVAR Imagery collected and processed
• Imagery is combined with other data sets
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Environmental products
EMWIN
GOES DCS
Administrative Messages
• Data is encapsulated into LRIT packets
• Information is sent to Wallops Island CDA
then up-linked to GOES 11 and GOES 12
Learn More
• More information on LRIT:
• LRIT/HRIT Global Specification
– http://www.eumetsat.int/groups/cps/document
s/document/pdf_cgms_03.pdf
• http://www.noaasis.noaa.gov/LRIT
– Currently under major revision
Transition to GOES N-P
• EMWIN
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Power reduced and changes in frequency & modulation
All legacy EMWIN receivers become obsolete
Dedicated transponder
Data rate doubles
Forward error correction (FEC)
• LRIT
• Dedicated transponder
Transition to GOES R-S
• EMWIN and LRIT merge
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Service becomes HRIT/EMWIN
Frequency changes
EMWIN modulation changes
Data rate increases to 400 kbps
EMWIN and LRIT GOES N user receive systems
become obsolete
Flexible Solution Required
• To minimize transition impact on users
• Keep user costs low
• Improvements to services
Proof of Concept Receiver
• GOES R Program, NESDIS and NWS coordinated effort
• Development performed for GOES-R Program by
Aerospace Corporation
• S/W Defined Radio (SDR) solution chosen
• Development begun in early 2008
• Satisfactory performance test at Wallops CDA, August 2009
• S/W, documentation and performance data will be released
in near future
• Will be available on GOES-R Web site
HRIT/EMWIN
SDR Proof of Concept
Transition Agile Solution
• One hardware/software configuration can receive all
current and future EMWIN, LRIT and HRIT/EMWIN
signals
• Could be used now
• Reduced user impact
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•
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Low cost (components < $100)
Generic hardware
Small form factor/portability
SDR receiver is upgradeable
No future hardware changes (GOES I-S compatible)
HRIT/EMWIN SDR
1 meter dish
Aerospace IF Digitizer (AID)
PC
LNB
IF
USB
S/W Receiver
&
Display S/W
HRIT/EMWIN AID
RF Input
Filter
AGC
FPGA
ADC
USB
Data Out
Total Cost < $100
Conclusion
• HRIT/EMWIN proof of concept receiver will be
demonstrated at poster session using GOES 14
live data
• Check for documentation and S/W release at:
http://www.goes-r.gov/