DOMSAT and LRIT Issues

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					 A Proposal to Update LRIT to Provide
Reliable Rebroadcast Tool for GOES DCS

      Information Update for TWG


              Kay Metcalf
     NOAA GOES DCS Program Manager

              May 12, 2011
                   GOES DCS Rebroadcast
• Currently Provided through Commercial DOMSAT contract
• Has Worked Well for Many years but has become logistically
  cumbersome
   – Contract Mechanism to Encourage Free and Open Competition Makes it
     Difficult to Manage User Transitions Required
          • Requiring Technology Continuity Restricts Competition to only one vendor
   – Coverage Restricted to Continental U.S.
   – Cost otherwise would most likely be prohibitive
   – Vendor currently providing more coverage, but is “at will”
          • Could be changed at any time because contract does not require
            hemispheric coverage
   – Exchanging fund between government agencies to fund contract has
     become very difficult




   May 2011                            NOAA GOES DCS                              2
                         DOMSAT Status
• Final Option Year of DOMSAT contract exercised
• Beginning new one year bridge contract
    – Paperwork in progress
• 2011 (Sept) funded by NOS, USGS, BLM, BR and USACE
    – MOU’s set up for BLM and USACE (amendments in progress)
    – MOU in progress for BR
    – USGS made “quid pro quo” arrangement with NOS
    – NOS funds directly tapped through procurement documents (means
      no MOU required)
    – NESDIS (Kay’s office) providing $12k
• NESDIS will combine all DOMSAT service contracts for 5
  year follow on contract
• Suggested Changes to LRIT makes it viable replacement



 May 2011                     NOAA GOES DCS                       3
              Low Rate Information Transfer (LRIT)

• GOES Rebroadcast of NESDIS products
       – Primary Function to provide user access to NESDIS satellite
         products at low cost
       – “Packetized format”
           • Information Packaged in Small Files
       – GOES DCS Rebroadcast Provided to provide low cost reception
         of data to platform owners
• Products created at NOAA Satellite Operations Facility
  (NSOF) in Suitland, MD
• Transferred to WCDA via land lines
• Transmitted to satellite at Wallops




Nov-2010                            NOAA GOES DCS                      4
                          GOES DCS Into LRIT

• Uses an LRGS client with username “LRIT”
     –     Originally implemented because DAPS code could not be modified
     –     LRGS located at Wallops
     –     LRGS user makes request to WCDA for data every 30 seconds
     –     File created and transferred to LRIT system in Suitland
     –     Inserted into LRIT stream at Suitland
• LRIT stream transferred to WCDA
• Infamous “double hop”




Nov-2010                          NOAA GOES DCS                        5
                              Vulnerabilities

• Priority assignments could provide conflicts when system
  fully loaded (not seen yet)
       – Currently DCS Random has Priority “1”
       – Regular DCS has Priority “2”
       – Must be integrated with standard LRIT data stream (i.e. images)
• LRGS is separate process for technical staff to monitor
• Interfaces unclear
       – Sometimes WCDA thinks LRIT is down
       – Sometimes LRIT technicians think “DCS” is down
       – An extra step for technicians to remember
           • Manual restart process required in case of nonstandard actions like
             reboot




Nov-2010                            NOAA GOES DCS                                  6
           Recommendation for DCS Insert into LRIT

•    DADDS is DCS Standard Distribution System
•    LRIT stream similar to DOMSAT and NWSTG streams
•    Provide “spicket” to feed LRIT from DADDS
•    ADVANTAGES:
       – Only one platform to maintain
       – Only one process to restart
• DADDS from NSOF insert DCS into LRIT
• Backup LRIT at WCDA can be fed by WCDA DADDS
       – IF LRIT at NSOF goes down WCDA will pick up operations




May 2011                         NOAA GOES DCS                    7
           Recommendation to Remedy Priority Concerns

• LRIT system on GOES-R renamed “HRIT/EMWIN”
       – Data rate faster so “High Rate” instead of “Low Rate”
       – Emergency Managers Weather Information Network (EMWIN)
         stream combined
• Proposal to GOES-R from LRIT, EMWIN and DCS
  programs:
       – Provide virtual channels for each service
             •   HRIT will have one stream
             •   EMWIN will have one stream
             •   DCS Rebroadcast will have one stream
             •   Each service given channels based on predefined bandwidth
             •   Priorities for each service will be determined within those bands by
                 the program (DCS will define priorities for their portion of uplink,
                 etc.)


May 2011                                 NOAA GOES DCS                                  8
             Status of GOES-R Proposal

• Integrated Product Team (IPT) formed
• Initial discussions begin
• Funding not yet Confirmed to Build Ground System




Nov-2010                NOAA GOES DCS                9
                       NEXT Steps for DCS

• Closely monitor HRIT/EMWIN Discussions
       – DCS team members on IPT
• Close to Decision within a few months
• Begin Analysis of Changes Required for Receivers
  Quickly
       – High hopes that not many changes required
• Continue Existing DOMSAT contract for 5 years to allow
  time for Transition




Nov-2010                        NOAA GOES DCS              10

				
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