GOES Program Overview

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GOES Program Overview

• WEFAX/LRIT Users Meeting
• Silver Spring, MD
• November 14, 2000

G. Dittberner, NOAA/NESDIS, GOES Program Manager
(Acting)
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GOES Program Overview

• GOES satisfies National Weather Service (NWS)
  requirements for 24 hour observation of weather
  and Earths environment to support storm-scale
  weather forecasting by forecasters and numerical
  models
• To meet requirements, GOES continuously maintains
  operational satellites at two locations (75
  degrees West and 135 degrees West), with an
  on-orbit spare ready in case of failure

On-Orbit Storage
Operational Spacecraft
3
(No Transcript)
4
Value of 7 Year Satellites
To provide continuous data from 2 locations
(GOES-WEST GOES-EAST) 15 years 14
years
2015
2020
2025
2010
6 Five year satellites
2010
2017
2024
4 Seven year satellites Savings 2 satellites
Over 15 years, 7 year satellites avoid the cost
of 2 satellites ( 650 M)
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GOES Planning Launch Dates
as of November 2000
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Instrument Plans
Satellite Imager Sounder SXI DCS SAR WEFAX EMWIN E
IO2 GOES-8 X X X X X X GOES-9 X X X X X
X GOES-10 X X X X X X GOES-11 X X X X X X GOES-M
X X X X X X X GOES-N X X X X X1 X4 AO3 GOES-O X
X X X X X1 X4 AO GOES-P X X X X X1 X4 SEI GOES-Q
ABI X X X X X1 X4 AO GOES-R ABI ABS TBD X X X1 X4
TBD
Notes 1Digital LRIT beginning with GOES-N
2Experimental Instrument of Opportunity
3Announcement of Opportunity
4Separate EMWIN Channel
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WEFAX/LRIT Channel Performance Summary
  PARAMETER GOES- I/M
GOES-NO/P/Q
GOES-NO/P/Q NOTES   -FREQUENCY
1691.000 MHz
1691.000 MHz   -TRANSPONDER
SHARED WITH EMWIN DEDICATED
CHANGE FROM GOES-I/M PROGRAM   - DATA
TRANSMISSION ANALOG
DIGITAL CHANGE FROM
GOES-I/M PROGRAM   -MODULATION
AM/FM BPSK,
NRZ-M

-OCCUPIED BANDWIDTH 25 KHz
----
CONTROLLED BY BOEING
SPACECRAFT SYSTEMS (BSS)   -SYMBOL RATE
N.A.
293 KSPS CHANGE FROM
GOES-I/M PROGRAM   -TRANSMIT POWER
40.9 dBm ---
DEFINED BY TRANSMIT
EIRP VALUE   -TRANSMIT EIRP
55.3 dBm 48.2 dBmI
BEST AVAILABLE DATA
  -USER RECEIVE G/T -0.3 dB K
-0.3 dB K   -BIT ERROR RATE
N.A.
1X10-8 CHANGE
FROM GOES-I/M PROGRAM   -REQUIRED C/No
57.0 dB-Hz
N.A.   - REQD Eb/No N/A
4.9 dB
GROUND SYSTEM LOSS BUDGET
IS 2.3 dB   - NOMINAL MARGIN 7.0
dB 1.0 dB
BEST AVAILABLE DATA
  -DATA CODING USED NO
YES
CONVOLUTIONAL RATE ½ CONSTRAINT LENGTH
K7

INNER AND
REED-SOLOMON OUTER CODE    
Source NOAA/SAO working in conjunction with
NASAs GOES Project Team
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LRIT Transition Plan
1998
1999
2000
2001
2002
2003
WMO LRIT/LRPT position
US Adoption of WMO position
Technical Analysis
Implementation Plan
LRIT Preparation
Compatibility Testing
Prototype Testing
NOAA/Industry Developments
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LRIT Transition Plan - Backup
1998
1999
2000
2001
2002
2003
WMO LRIT/LRPT position
US Adoption of WMO position
Technical Analysis
Implementation Plan
LRIT Preparation
Compatibility Testing
Prototype Testing
NOAA/Industry Developments
LRIT Operation on I-M (EMWIN transparent on I-M)
GOES East Switchover
Transmission Changes
Transition Check Point
GOES West Switchover
GOES-N Services
LRIT Operation (enhanced EMWIN)
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WEFAX / EMWIN

• Changes from GOES I-M to GOES N-Q will impact all
  users to the some extent especially those with
  small receivers antennas, and marginal receive
  systems
• Full Discussion at WEFAX User Conference Nov
  14, 2000
• Low Rate Information Transmission (LRIT)
• Transition from Analog WEFAX to Digital (WEFAX)
  LRIT
• Potential large changes both NESDIS and user
  systems
• OSDPD preparing transition plans
• OSD Technical studies, system design, and
  preliminary testing
• Accommodate the growing number of EMWIN users
• Working with W/OSO and E/OSDPD to Develop path to
  ensure the end-to-end system satisfies users
  need.
• Perhaps embed EMWIN products in LRIT suite
• Retain EMWIN Channel for Low-End
  Warnings/Advisory messages
• Engage service product oversight panel of SPSRB

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Program Direction

• Current 5-year GOES satellites and instruments
  are based on late 1970s design and materials,
  many of which are no longer manufactured
• Current GOES instruments do not satisfy validated
  1999 requirements for storm scale numerical
  models and finer time resolution for the
  modernized National Weather Service
• Advanced Baseline Imager (ABI) and Advanced
  Baseline Sounder (ABS) will satisfy NWS
  requirements
• GOES will benefit by infusing state-of-the-art
  technology being developed by NASA, i.e., new
  geostationary imaging Fourier transform
  spectrometer (GIFTS)
• 7 year lifetimes will avoid costs equivalent to
  two satellites over 15 years