KPL/SCLK
APM1 SCLK File --- Nominal Clock
===========================================================================
This file is a SPICE spacecraft clock (SCLK) kernel containing
information required for converting APM1 spacecraft on-board clock
times to other time systems (UTC, ET, etc.) and vice versa.
This SCLK kernel represents the nominal APM1 on-board clock, which
was synchronized with UTC seconds past J2000 TDB.
Version and Date
--------------------------------------------------------
Version 1 -- August 20, 2024 -- Derek Maggard, CLPS
Initial release.
Contact Information
--------------------------------------------------------
If you have any questions regarding this file contact:
Derek R. Maggard, CLPS, Derek.R.Maggard@nasa.gov
References
--------------------------------------------------------
1. SCLK Required Reading Document
2. MAKCLK User's Guide Document
3. SFOC SCLKvSCET SIS Document
4. ``M-PE1-CQ-0101J'' Payload Interface Control Document (ICD) -
LETS
Production/History of this SCLK file
--------------------------------------------------------
This file was generated by the NAIF utility program MAKCLK with a
fake SCLKvSCET file (see the comment sections ``SCLKvSCET File
Contents'' and ``MAKCLK Setup File'' below for the MAKCLK setup
file).
The clock was calibrated from the ground periodically during flight
and is estimated to have drifted less than ~20ms between
calibrations. The inherent error in UTC time even after calibration
is +/- ~72ms.
The term ``fake sclk_scet'' is used because neither ``DUT'' nor the
``SFDU keyword lines'' were prepared (they are not read by MAKCLK).
Note that this clock's zero epoch is 0.0 ET while its correlation
represents a nominal clock (rate = 1.0) counting UTC seconds. [4]
Usage
--------------------------------------------------------
This file and an appropriate leap seconds kernel (LSK) must be
loaded into the user's program by a call to the FURNSH subroutine:
CALL FURNSH ( 'file_name' ) -- FORTRAN
furnsh_c ( "file_name" ); -- C
cspice_furnsh, 'file_name' -- IDL
cspice_furnsh( 'file_name' ) -- MATLAB
in order to use the SPICELIB SCLK family of subroutines to convert
spacecraft on-board clock to ET and vice versa.
SCLK Format
--------------------------------------------------------
The on-board clock, the conversion for which is provided by this
SCLK file, consists of two fields:
SSSSSSSSSS:FFFFF
where:
SSSSSSSSSS -- count of on-board seconds
FFFFF -- count of fractions of a second with one
fraction being 1/65536 of a second
Fake SCLKvSCET File Contents
--------------------------------------------------------
CCSD3ZS00001$$sclk$$NJPL3KS0L015$$scet$$
CCSD3RE00000$$scet$$NJPL3IS00613$$data$$
*____SCLK0_______ ____SCET0____________ _DUT__ _SCLKRATE___
000000000.000 2000-001T11:58:55.816 0 1.000000000
189345664.000 2005-365T23:59:59.816 0 2.000000000
189345665.000 2006-001T00:00:00.816 0 1.000000000
284040064.000 2008-366T23:59:59.816 0 2.000000000
284040065.000 2009-001T00:00:00.816 0 1.000000000
394372864.000 2012-182T23:59:59.816 0 2.000000000
394372865.000 2012-183T00:00:00.816 0 1.000000000
488980864.000 2015-181T23:59:59.816 0 2.000000000
488980865.000 2015-182T00:00:00.816 0 1.000000000
536500864.000 2016-366T23:59:59.816 0 2.000000000
536500865.000 2017-001T00:00:00.816 0 1.000000000
CCSD3RE00000$$data$$CCSD3RE00000$$sclk$$
MAKCLK Setup file
--------------------------------------------------------
SCLKSCET_FILE = apm1.sclkscet
OLD_SCLK_KERNEL = apm1_template.tsc
FILE_NAME = apm1.tsc
NAIF_SPACECRAFT_ID = -244
LEAPSECONDS_FILE = /media/sf_Shared/kernels/lsk/naif0012.tls
PARTITION_TOLERANCE = 394
LOG_FILE = apm1.log
Kernel DATA
--------------------------------------------------------
This file is a SPICE spacecraft clock (SCLK) kernel. This file was generated
by the NAIF MOSPICE utility program MAKCLK, version 5.1.0, 26-OCT-2021. Please refer to the
SCLK Required Reading file, NAIF document number 222, and the MAKCLK User's
Guide, NAIF document number 267, for information regarding this kernel file.
\begindata
SCLK_KERNEL_ID = ( @2024-08-20/12:21:21.30 )
SCLK_DATA_TYPE_244 = ( 1 )
SCLK01_TIME_SYSTEM_244 = ( 2 )
SCLK01_N_FIELDS_244 = ( 2 )
SCLK01_MODULI_244 = ( 4294967296 65536 )
SCLK01_OFFSETS_244 = ( 0 0 )
SCLK01_OUTPUT_DELIM_244 = ( 1 )
SCLK_PARTITION_START_244 = ( 0.0000000000000E+00 )
SCLK_PARTITION_END_244 = ( 2.8147497671065E+14 )
SCLK01_COEFFICIENTS_244 = (
0.0000000000000E+00 -3.5763036976277E-10 1.0000000000000E+00
1.2408957435904E+13 1.8934566400000E+08 2.0000000000000E+00
1.2408957501440E+13 1.8934566600000E+08 1.0000000000000E+00
1.8614849634304E+13 2.8404006500000E+08 2.0000000000000E+00
1.8614849699840E+13 2.8404006700000E+08 1.0000000000000E+00
2.5845620015104E+13 3.9437286600000E+08 2.0000000000000E+00
2.5845620080640E+13 3.9437286800000E+08 1.0000000000000E+00
3.2045849903104E+13 4.8898086700000E+08 2.0000000000000E+00
3.2045849968640E+13 4.8898086900000E+08 1.0000000000000E+00
3.5160120623104E+13 5.3650086800000E+08 2.0000000000000E+00
3.5160120688640E+13 5.3650087000000E+08 1.0000000000000E+00 )
\begintext