Tuesday, October 06, 2015 Santos Rodriguez NWS EMWIN HRIT/EMWIN.
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Transcript of Tuesday, October 06, 2015 Santos Rodriguez NWS EMWIN HRIT/EMWIN.
Wednesday, April 19, 2023
Santos RodriguezNWS EMWIN
HRIT/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 WorksHow EMWIN Works
• Data is collected from the NWS Gateway, Weather Data is collected from the NWS Gateway, Weather Wire and the InternetWire and the Internet
• Assembled and prioritizedAssembled and prioritized• Sent to NESDIS, (Wallops CDA) where it is up-Sent to NESDIS, (Wallops CDA) where it is up-
linked to GOES 11 and GOES 12linked to GOES 11 and GOES 12• Sent further west via “Peace Sat” (NOAA donated Sent further west via “Peace Sat” (NOAA donated
GOES-7) in a cooperative effort between NWS GOES-7) in a cooperative effort between NWS Pacific Region and the Univ. of HawaiiPacific Region and the Univ. of Hawaii
• Transmitted via VHF radio (local re-broadcast) in Transmitted via VHF radio (local re-broadcast) in some areassome areas
• Sent on the Internet via IP unicastSent 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 WorksHow LRIT Works• GVAR Imagery collected and processedGVAR Imagery collected and processed
• Imagery is combined with other data setsImagery is combined with other data sets• Environmental productsEnvironmental products• EMWINEMWIN• GOES DCSGOES DCS• Administrative MessagesAdministrative Messages
• Data is encapsulated into LRIT packetsData is encapsulated into LRIT packets
• Information is sent to Wallops Island CDA Information is sent to Wallops Island CDA then up-linked to GOES 11 and GOES 12then 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• 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• 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
• 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
LNBS/W Receiver
&Display S/W
1 meter dish
USB
Aerospace IF Digitizer (AID)
PC
IF
HRIT/EMWIN AID
FPGA
USB
ADC
Filter
AGC
Total Cost < $100
RF Input
Data Out
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/