970113: TBUS01-004 KWBC-changes-NOUS (fwd)

• To: nws-changes@xxxxxxxxxxxxxxxx
• Subject: 970113: TBUS01-004 KWBC-changes-NOUS (fwd)
• From: Linda Miller <lmiller@xxxxxxxxxxxxxxxx>
• Date: Mon, 13 Jan 1997 09:12:06 -0700 (MST)

551 
NOUS40 KWBC 131524
FOS NOTICE NO. 1032         01-13-97

CHANGES TO TBUS01 - 04 KWBC SATELLITE APT PREDICT
MESSAGES

EFFECTIVE JAN 29 1997.

/1/ PART IV OF THE TBUS BULLETIN BEGINS WITH 5 LINES OF
CODED INFORMATION FOLLOWED BY PLAIN LANGUAGE INFORMATION
CONCERNING SATELLITE OPERATIONS. WITHIN THE PLAIN
LANGUAGE SECTION IS INFORMATION ABOUT THE ONBOARD
SPCAECRAFT TIP CLOCK CORRECTION.

AN EXAMPLE OF THE CURRENT CLOCK CORRECTION INFORMATION
FOLLOWS -  LAST TIP CLK CORR 12/31/95 CLK ERR AFTER
CORR MINUS 0.1 SEC CLK ERR AS OF 04/15/96 PLUS 0.20 SEC.
ERR RATE AS OF 04/01/96 PLUS 2 MS/DAY /ESTIMATED/.
NEXT CLK CORRECTION 08/20/96.

EFFECTIVE JAN 29 1997 AN ADDITIONAL CODED LINE CONTAINING
THE TIP CLOCK CORRECTION INFORMATION WILL BE ADDED TO
PART IV PRIOR TO THE PLAIN LANGUAGE SECTION.  THIS LINE
WILL HAVE 6 A/N FIELDS CODED AS FOLLOWS -

MMDDYY - MONTH DAY YEAR OF LAST CLOCK CORRECTION

STTTTT - SIGN /P OR M/ AND CLOCK ERROR AFTER CORRECTION
         IN SECONDS TO 3 DECIMAL PLACES

STTTTT - SIGN /P OR M/ AND CURRENT CLOCK ERROR IN
         SECONDS TO 3 DECIMAL PLACES

MMDDYY - MONTH DAY YEAR OF MEASURED ERROR RATE

STTTTT - SIGN /P OR M/ AND CLOCK ERROR RATE EXPRESSED
         AS MILLISECONDS/DAY

MMDDYY - MONTH DAY YEAR OF NEXT CLOCK CORRECTION

IF THE NEXT CLOCK CORRECTION DATE /FIELD 6/ IS UNKNOWN IT
WILL BE SET TO ALL ZEROS.  IF ANY ERRORS ARE
UNKNOWN/FIELDS 2 3 OR 5/ THE FIELD WILL BE SET TO
P99999.

THE PLAIN LANGUAGE EXAMPLE IN PARAGRAPH 2 ABOVE WOULD
BE CODED IN THE NEW FORMAT AS FOLLOWS -

123195 M00100 P00200 040196 P00002 082096

FROM JAN 27 THROUGH FEB 12 1997 BOTH THE PLAIN
LANGUAGE AND CODED TIP CLOCK CORRECTION INFORMATION
WILL BE CONTAINED IN PART IV SO USERS MAY BECOME
FAMILIAR WITH THE NEW CODE. EFFECTIVE WITH THE TBUS MSGS
ISSUED FEB 13 THE PLAIN LANGUAGE CLOCK CORRECTION
INFORMATION WILL BE DISCONTINUED AND ONLY THE
CODED CLOCK INFORMATION TRANSMITTED.

/2/ EFF ON NOV 26 1996 THE SPARESPARE FIELD AT THE END OF
THE CODED PORTION OF PART IV WAS REPLACED WITH THE EQUATOR
CROSSING LONGITUDE OF THE EPOCH REFERENCE ORBIT NUMBER
CONTAINED IN FIELD 2 OF PART IV.  THE CROSSING LONGITUDE
IS MEASURED AS EAST LONGITUDE TO 5 DECIMAL
PLACES /LLLLLLLL/.

USERS WITH QUESTIONS OR CONCERNS ABOUT THESE CHANGES ARE
ADVISED
TO CONTACT E HARROD VIA E-MAIL EHARROD/AT/NESDIS.NOAA.GOV OR
FAX 301-457-5199.  USERS ARE ALSO DIRECTED TO THE NOAA
SATELLITE INFO WEB SITE AT URL
//PSBSGI1.NESDIS.NOAA.GOV/NOAASIS.HTML AND
THE  SATELLITE NAVIGATION WEB SITE AT URL
//PSBSGI1.NESDIS.NOAA.GOV
8080/ISB/NAVIGATION/NAVPAGE.HTML
END
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