# Presentation: 184125

## GOES-R Auxiliary Services(LRIT, EMWIN, DCS, SAR)

*Gerald Dittberner (NOAA/NESDIS)*

- Satellite Direct Users Conference for the Americas
- Miami, Florida
- December 12, 2002

## GOES On-Orbit Status

- GOES-8 continues to function as the GOES-East operational satellite
- Functioning on several redundant systems
- All fuel reserves for N-S Inclination Manuevers depleted in December 2002
- Has exceeded operational life by 3 + years
- Being removed from operational service in April 2003
- GOES-9 removed from operational service in July 1998
- Being made available to the Japanese to provide emergency coverage to back-up GMS
- Relocation to 205W begins December 19, 2002
- GOES-10 has functioned as the GOES-West operational satellite for the last 4 years
- Difficult to quantify remaining mission life due to Solar Array anomaly
- GOES -11 and GOES –12 are in on-orbit storage mode, ready to replace either GOES-East or West
- Transition plan developed to move GOES-12 to GOES-East with an April 2003 Operational date

## GOES Launch Planning

## GOES East (75oW), Goes West (135oW)System Coverage

- Lines are elevation angles of 5, 10, 20, and 30 degrees

## GOES-12 Spacecraft

**S-Band**
**(DCS, SAR)**

**UHF**
**(DCS, SAR)**

**S-Band**
**SAR (Rcv)**

**SAR**

## GOES N Spacecraft

- Picture taken 3/26/02

**UHF (DCS, SAR)**

**S-Band Transmit & Receive**
** ****(DCPR, SAR)**

## Low Rate Information transmission (LRIT)

- For the next decade (2002 - 2012):
- LRIT (digital) will begin in 2003 replacing the analog WEFAX signal
- Data rate will be 128Kbps
- Beginning in 2012 (the GOES-R era):
- LRIT is planned to be continued with at least the level of service to be provided up to 2012
- Data rate will be 256Kbps

## Emergency Managers Weather Information Network (EMWIN)

- Currently:
- EMWIN is broadcast at 9.6Kbps
- For 2002 - 2012:
- EMWIN will change to an increased data rate of 20Kbps by 2004
- The frequency will change from 1690.725 to 1692.7000
- Modulation and coding will change
- Beginning in 2012:
- EMWIN is expected to continue, but be driven by requests for more information (higher data rates), yet to be determined

## Direct Communication System (DCS)

- _GOES DCS_

- _Polar DCS (Argos)_

## Data Communications System (DCS)

- Currently:
- DCS has 22,500 100bps platforms, transmitting an average 2.4Kbps of data through the 200 national DCS channels
- For 2002 - 2012:
- DCS continues to grow capability with 300bps and 1200bps modulators/demodulators gradually replacing the 100bps units
- Ultimate system capacity is 232,200 platforms, transmitting an average 93Kbps of data through the 200 national DCS channels
- Beginning in 2012:
- DCS is expected to inject CDMA and TDMA, sharing the DCS bandwidth with the 300bps/1200bps platforms
- An optimized system capacity under this configuration is expected to be 290,000 users with an average 180Kbps of data throughput
- Alternative architectures using other satellite systems are also being examined for user utility and effectiveness
- GOES-R series might be several small satellites instead of two large satellites
- Possibilities for DCS may include: GOES, GPS, other GEO and LEO satellites, or some form of commercial service

## Search and Rescue (SAR)

- Currently:
- GOES systems compliments polar and Argos systems
- 406.025 systems (1544.5 downlink)
- For 2002 - 2012:
- GOES continues with no changes
- Beginning in 2012:
- SAR is included in the GOES-R baseline system
- GPS location reporting is being considered as a message option, as is the possibility of an acknowledgement of the distress call to the originating beacon
- A main driver is user transmitter power.  LEO systems require much less power than GEO systems
- Alternate architectures fro GOES-R are being examined
- May be several small satellites instead of two large satellites
- SAR platforms Include GOES, other polar systems, GPS, commercial service

## Summary

- The GOES-R Baseline is being developed assuming auxiliary services will be continued, with performance at least at the current level
- Analysis continues to evaluate whether some services might provide greater utility or be more effective on systems other than GOES-R

## Web Sites

- EMWIN:
- _[http://iwin.nws.noaa.gov/emwin/indexlist.html](http://iwin.nws.noaa.gov/emwin/indexlist.html)_
- LRIT
- http://noaasis.noaa.gov/WEFAX/
- DCS
- http://noaasis.noaa.gov/DCS/index.html
- SAR
- http://www.sarsat.noaa.gov/

## Backup Charts

## Development of South American Region