# Presentation: 887598

## GOES Program Overview

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

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

## GOES Program Overview

- GOES satisfies National Weather Service (NWS) requirements for 24 hour observation of weather and Earth’s 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

## Slide 3

## Value of 7 Year Satellites

- 15 years
- 14 years

- 6  Five year satellites

- 4  Seven year satellites
- Savings:
**2 satellites**

- 2010

- 2015

- 2020

- 2025

- 2010

-     2017

- 2024

- Over 15 years, 7 year satellites avoid the cost of 2 satellites (~ $ 650 M)

## GOES Planning Launch Dates

- as of November 2000

## Instrument Plans

- _Satellite__	__Imager__	__Sounder__	__SXI__	__DCS__	__SAR__	__WEFAX__	__EMWIN__	__EIO_2
- 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

## 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.
- - REQ’D 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 1⁄2 CONSTRAINT LENGTH  K=7
-                                                                                                                                        INNER AND REED-SOLOMON OUTER CODE

- Source:  NOAA/SAO working in conjunction with NASA’s GOES Project Team

## LRIT Transition Plan

***1999***

***2000***

***2001***

***2002***

***2003***

**   ****WMO**
**LRIT/LRPT**
**  ****position**

**US Adoption**
** ****of WMO**
** ****position**

**Technical Analysis**

**Implementation         Plan**

**Compatibility     Testing**

**NOAA/Industry Developments**

**Prototype Testing**

**LRIT Preparation**

***LRIT Transition Plan***

## LRIT Transition Plan - Backup

***1999***

***2000***

***2001***

***2002***

***2003***

**   ****WMO**
**LRIT/LRPT**
**  ****position**

**US Adoption**
** ****of WMO**
** ****position**

**Technical Analysis**

**Implementation         Plan**

**Compatibility     Testing**

**NOAA/Industry Developments**

**Prototype Testing**

**LRIT Preparation**

**Transition     Check                       Point**

**GOES West Switchover**

**GOES-N Services**

**LRIT Operation (enhanced  EMWIN)**

**GOES East Switchover**

**Transmission Changes**

**LRIT Operation on I-M  ****(EMWIN transparent on I-M)**

***LRIT Transition Plan - Backup***

## 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

## Program Direction

- Current 5-year GOES satellites and instruments are based on late 1970’s 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