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GIAC memo 2002/06/02

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   <title>GIAC Memo: Digital Distortion Anomaly Test</title>

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<td ALIGN=RIGHT VALIGN=CENTER><b><font size=+3>GIAC </font><font size=+2>GPS

Interagency Advisory Council</font></b></td>

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    <td ALIGN=RIGHT COLSPAN="2">02-June-2002</td>

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<td VALIGN=TOP>GIAC News Flash:</td>



    <td VALIGN=TOP>NANU 2002075/2002078</td>

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<p>Dear GIAC, 

<p> This message is being sent on behalf of Charlie Challstrom, Chair, GIAC. </p>

<p> This message is informational. While NANU's are not normally distributed through 

  GIAC -- this involves a 48 hr. test of a slightly different protocol on setting 

  health bits. No impact is expected, but please use the NAVCEN if a problem is 

  encountered. </p>

<p> Thanks! </p>

<p> ************************************************************* <br>

  *********NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2002075 <br>

  SUBJ: SVN23 (PRN23) FORECAST OUTAGE RESCHEDULED </p>

<p> 1. NANU NUMBER: <b>2002075</b> <br>

  NANU DTG: 312209Z MAY 2002 <br>

  NANU Type: FCSTRESCD <br>

  REFERENCE NANU: 2002072 <br>

  REF NANU DTG: 241650Z MAY 2002 <br>

  SVN: 23 <br>

  PRN: 23 <br>

  START JDAY: 156 <br>

  START TIME ZULU: 1600 <br>

  START CALENDER DATE:Wednesday, June 05, 2002 <br>

  STOP JDAY: 158 <br>

  STOP TIME ZULU: 1600 <br>

  STOP CALENDER DATE: 07 JUN 2002 <br>

  2. CONDITION: GPS SATELLITE SVN23 (PRN23) WILL BE UNUSABLE ON JDAY 156 (05 JUN 

  2002) BEGINNING 1600 ZULU UNTIL JDAY 158 (07 JUN 2002) ENDING 1600 ZULU. PLEASE 

  REFERENCE NANU NUMBER 2002072 DTG 241650Z MAY 2002 FOR THE ORIGINAL OUTAGE TIME. 

</p>

<p> 3. POC: CIVILIAN - NAVCEN AT (703)313-5900, HTTP://WWW.NAVCEN.USCG.GOV MILITARY 

  - GPS Support Center, DSN 560-2541, <br>

  COMM 719-567-6616, GPS@SCHRIEVER.AF.MIL, HTTP://WWW.SCHRIEVER.AF.MIL/GPS </p>

<p> <b>2002078</b>------------------------ <br>

  *** GENERAL MESSAGE TO ALL GPS USERS *** <br>

  REGARDING NANU 2002075, PRN 23'S HEALTH BIT WILL BE SET TO '11111.' FOR THIS 

  48 HOUR PERIOD, THE US COAST GUARD (USCG) NAVIGATION CENTER (NAVCEN) IS THE 

  FEEDBACK PATHWAY FOR ALL CIVIL GPS USERS, WITH THE EXCEPTION OF <br>

  AVIATION USERS. THE FEDERAL AVIATION ADMINISTRATION (FAA) NATIONAL OPERATIONS 

  CONTROL CENTER (NOCC) IS THE FEEDBACK PATHWAY FOR CIVIL AVIATION GPS USERS. 

</p>

<p> FOR THIS PERIOD, THE GPS SUPPORT CENTER (GSC) WILL OPERATE 24/7 AND SERVE 

  AS THE SPACEAF FEEDBACK POC FOR THE NAVCEN AND NOCC. THE MILITARY USERS WILL 

  PROVIDE FEEDBACK THROUGH THE USSPACECOM SPOC AND/OR THE SPACEAF AOC. </p>

<p> THE NAVCEN AND NOCC HAVE STANDARD FORMATS (TO INCLUDE SPECIFICS OF LOCATION, 

  RECEIVER BEHAVIOR, USER ACTIONS, AND DIAGNOSTIC DATA THAT MAY BE AVAILABLE, 

  ETC.) FOR REPORTING GPS PROBLEMS, ANOMALIES, AND OUTAGES. THESE FORMATS WILL 

  PROVIDE SUFFICIENT INFORMATION FOR REPORTING CIVIL IMPACTS. </p>

<p> ROUTE ANY OTHER FEEDBACK THROUGH SPACEAF AOC AT COMMERCIAL (805) 606-9994 

  OR DSN 276-9994. </p>

<p> *** GENERAL MESSAGE TO ALL GPS USERS *** <br>

  *******************************************************************</p>

<p><font face="Arial"><font size=-1>for information write:</font></font>

<br><font face="Arial"><font size=-1>GPS INTERAGENCY ADVISORY COUNCIL</font></font>

<br><font face="Arial"><font size=-1>FEDERAL GEODETIC CONTROL SUBCOMMITTEE</font></font>

<br><font face="Arial"><font size=-1>NOAA, National Geodetic Survey, N/NGS</font></font>

<br><font face="Arial"><font size=-1>1315 East-West Highway, Room 8657</font></font>

<br><font face="Arial"><font size=-1>Silver Spring, Maryland 20910-3282</font></font>

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