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/