KPL/SCLK Rosetta Lander SCLK File =========================================================================== This file is a SPICE spacecraft clock (SCLK) kernel containing information required for Rosetta lander on-board clock to UTC conversion. Usage -------------------------------------------------------- This file must be loaded into the user's program by a call to the FURNSH subroutine CALL FURNSH ( 'this_file_name; ) -- FORTRAN furnsh_c ( "this_file_name" ); -- C cspice_furnsh, 'this_file_name' -- IDL cspice_furnsh( 'this_file_name' ) -- MATLAB in order to use the SPICELIB SCLK family of subroutines to convert Rosetta lander 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 1/32 of a second References -------------------------------------------------------- 1. SCLK Required Reading Document 2. TIME Required Reading Document 3. KERNEL Pool Required Reading Document 4. Email from Daniel Popescu ``SCLK kernel for the lander'' on 6 January 2015. 5. Email from Boris Semenov ``Lander SCLK stuff'' on 29 April 2016. Inquiries -------------------------------------------------------- If you have any questions regarding this file contact SPICE support at ESAC: Marc Costa Sitja (+34) 91-8131-457 mcosta@sciops.esa.int, esa_spice@sciops.esa.int or the Rosetta SGS at ESAC: Rafael Andres (+34) 91-8131-443 randres@sciops.esa.int or NAIF at JPL: Boris Semenov (818) 354-8136 Boris.Semenov@jpl.nasa.gov Kernel DATA -------------------------------------------------------- The first version of this kernel was produced by Rafael Andres (Rosetta SGS). It was an experimental clock kernel inteded to be used in DValNG checks -validator for Rosetta Archives deliveries to ESA's Planetary Science Archive-. The kernel was generated with the indications from Daniel Popescu (see [4]) who provided the Time Correlation Packet data in addition to the followig indications: -- The LOBT have a resolution of 1/32s. -- There were 2 resets of the LOBT since 01/01/2003: 2007-04-03T10:42:07.000 2011-07-04T21:24:14.000 The generated SCLK was published in the Rosetta Lander Ancillary Data Dataset in the PSA Archive (RL-C-MULTI-5-ANCDR-V1.0). Later on it was noted (see [5]) that there were some inconsistencies in the SCLK. The following assumptions have been used to generate the current version of the SCLK: -- LOBT is synchronized with OOBT -- lander SCLK correlation is needed only for ~3 days after landing -- lander SCLK fractional part of is a counter of 1/32 of a second (corresponds to the first 5 bits of the full two-byte, 0..65536 fractional part of orbiter SCLK) Concerning the data itself, each TCP record inserted has the UTC "validity start time" equal to the time of the second TCP record in each pair minus 60 seconds. The on-board clock (OBT) value for this extra packet is computed using the gradient from the first TCP record in the pair, while the gradient of the extra packet is computed so that the linear function ``passes'' through the extra packet's UTC/OBT point and through the second packet's UTC/OBT point, thus forcing continuity between the two original trends. Kernel DATA -------------------------------------------------------- \begindata SCLK_KERNEL_ID = ( @2017-09-05/08:39:09.00 ) SCLK_DATA_TYPE_226800 = ( 1 ) SCLK01_TIME_SYSTEM_226800 = ( 2 ) SCLK01_N_FIELDS_226800 = ( 2 ) SCLK01_MODULI_226800 = ( 4294967296 32 ) SCLK01_OFFSETS_226800 = ( 0 0 ) SCLK01_OUTPUT_DELIM_226800 = ( 1 ) SCLK_PARTITION_START_226800 = ( 1177913820.9199708 4294966876.9280763 8589934172.8754880 ) SCLK_PARTITION_END_226800 = ( 4294966876.9280763 8589934172.8754880 137438953052.87110 ) SCLK01_COEFFICIENTS_226800 = ( 0.0000000000000E+00 1.3146108418400E+08 1.0000003200940E+00 3.3254389355469E+06 1.3156500418400E+08 9.9849419388587E-01 3.3273618310547E+06 1.3156506418400E+08 1.0000004222425E+00 6.0518406806641E+06 1.3165020418400E+08 1.0005040482889E+00 6.0537597133789E+06 1.3165026418400E+08 1.0000004021387E+00 2.8343030750000E+07 1.3234680418400E+08 9.9970762538422E-01 2.8344951311523E+07 1.3234686418400E+08 1.0000003492511E+00 6.9350664990234E+07 1.3362829318400E+08 9.9950662171612E-01 6.9352585937988E+07 1.3362835318400E+08 1.0000003081115E+00 1.1567180366650E+08 1.3507582918400E+08 9.9966924802356E-01 1.1567372430176E+08 1.3507588918400E+08 1.0000002853294E+00 1.7428026757959E+08 1.3690734418400E+08 9.9949264848674E-01 1.7428218855420E+08 1.3690740418400E+08 1.0000002510184E+00 2.0119014979980E+08 1.3774827818400E+08 1.0017404914952E+00 2.0119206646387E+08 1.3774833818400E+08 1.0000006630242E+00 2.2121454918848E+08 1.3837404118400E+08 9.9398702763207E-01 2.2121648080322E+08 1.3837410118400E+08 1.0000002396136E+00 3.6465014243457E+08 1.4285640418400E+08 9.9897439076347E-01 3.6465206440576E+08 1.4285646418400E+08 1.0000002101803E+00 4.0015218494434E+08 1.4396584318400E+08 9.9130575521341E-01 4.0015412178369E+08 1.4396590318400E+08 1.0000002090242E+00 4.9234917451270E+08 1.4684699918400E+08 9.9973050070934E-01 4.9235109503027E+08 1.4684705918400E+08 1.0000002016856E+00 5.3914180559326E+08 1.4830926918400E+08 9.9991328673534E-01 5.3914372575977E+08 1.4830932918400E+08 1.0000001964275E+00 6.1117996760986E+08 1.5056046218400E+08 9.9992625462498E-01 6.1118188775146E+08 1.5056052218400E+08 1.0000001905759E+00 6.7877614686963E+08 1.5267284318400E+08 9.9984946927749E-01 6.7877806715869E+08 1.5267290318400E+08 1.0000001830298E+00 7.6482697940918E+08 1.5536193218400E+08 9.9992371187501E-01 7.6482889955566E+08 1.5536199218400E+08 1.0000001836857E+00 8.2113314521338E+08 1.5712150018400E+08 9.9988201262058E-01 8.2113506543994E+08 1.5712156018400E+08 1.0000001786253E+00 1.0908052252700E+09 1.6554875418400E+08 1.0000750280083E+00 1.0908071451260E+09 1.6554881418400E+08 1.0000001800254E+00 1.1458775032119E+09 1.6726976318400E+08 9.9988862324601E-01 1.1458794234258E+09 1.6726982318400E+08 1.0000001751998E+00 1.2257519534321E+09 1.6976584018400E+08 9.9986853738560E-01 1.2257538736846E+09 1.6976590018400E+08 1.0000001751695E+00 1.3011719084736E+09 1.7212271418400E+08 9.9982328359423E-01 1.3011738288130E+09 1.7212277418400E+08 1.0000001688052E+00 1.4113490422148E+09 1.7556575018400E+08 9.9992320332657E-01 1.4113509623623E+09 1.7556581018400E+08 1.0000001607257E+00 1.6904500535039E+09 1.8428765818400E+08 1.0001014812447E+00 1.6904519733091E+09 1.8428771818400E+08 1.0000001614876E+00 1.7039646431270E+09 1.8470998918400E+08 9.9995448001813E-01 1.7039665632144E+09 1.8471004918400E+08 1.0000001544710E+00 1.7480591964033E+09 1.8608794418400E+08 1.0001106384602E+00 1.7480611161909E+09 1.8608800418400E+08 1.0000001575717E+00 1.8523043317651E+09 1.8934560518400E+08 1.0001883939801E+00 1.8523062833975E+09 1.8934566618400E+08 1.0000001623235E+00 2.0024272830293E+09 1.9403694818400E+08 1.0000958852510E+00 2.0024292028452E+09 1.9403700818400E+08 1.0000001649245E+00 2.2124803042026E+09 2.0060110618400E+08 1.0001322603290E+00 2.2124822239487E+09 2.0060116618400E+08 1.0000001701030E+00 2.4253128117456E+09 2.0725212318400E+08 9.9976837438226E-01 2.4253147321904E+09 2.0725218318400E+08 1.0000001733303E+00 2.5411549361118E+09 2.1087219018400E+08 1.0001749980669E+00 2.5411568557759E+09 2.1087225018400E+08 1.0000001765871E+00 2.7966605226572E+09 2.1885674118400E+08 9.9986726615577E-01 2.7966624429121E+09 2.1885680118400E+08 1.0000001720804E+00 2.9418554419272E+09 2.2339408318400E+08 9.9987947009562E-01 2.9418573621587E+09 2.2339414318400E+08 1.0000001710428E+00 3.0577166063418E+09 2.2701474518400E+08 9.9989192859150E-01 3.0577185265493E+09 2.2701480518400E+08 1.0000001695536E+00 3.5524026666738E+09 2.4247368718400E+08 1.0020026496438E+00 3.5524045828364E+09 2.4247374718400E+08 1.0000001834299E+00 3.9360607684624E+09 2.5446300518400E+08 1.0001131821610E+00 3.9360626882451E+09 2.5446306518400E+08 1.0000001864699E+00 3.9889391263853E+09 2.5611545418400E+08 9.9980192929511E-01 3.9889410467656E+09 2.5611551418400E+08 1.0000001769552E+00 4.3972612945112E+09 2.6887552418400E+08 9.9962833236137E-01 4.3972632152251E+09 2.6887558418400E+08 1.0000001857371E+00 4.5163069371143E+09 2.7259570118400E+08 9.9987819883798E-01 4.5163088573481E+09 2.7259576118400E+08 1.0000001848402E+00 4.5855409725513E+09 2.7475926518400E+08 9.9988709770930E-01 4.5855428927681E+09 2.7475932518400E+08 1.0000001744782E+00 4.8038948546704E+09 2.8158282518400E+08 1.0000938503598E+00 4.8038967744902E+09 2.8158288518400E+08 1.0000001775447E+00 4.8825246325303E+09 2.8404000618400E+08 9.9991946009248E-01 4.8825265846875E+09 2.8404006718400E+08 1.0000001809901E+00 4.9942465964673E+09 2.8753131818400E+08 9.9987336808845E-01 4.9942485167104E+09 2.8753137818400E+08 1.0000001780490E+00 5.0701965031880E+09 2.8990475318400E+08 1.0000864739485E+00 5.0701984230220E+09 2.8990481318400E+08 1.0000001786400E+00 5.5844381071582E+09 3.0597480618400E+08 1.0023464454729E+00 5.5844400226636E+09 3.0597486618400E+08 1.0000001953571E+00 5.5958424204360E+09 3.0633119118400E+08 9.4570293870281E-01 5.5958444506719E+09 3.0633125118400E+08 1.0000000778053E+00 5.5976455705317E+09 3.0638753618400E+08 1.0000002543132E+00 5.5976474905312E+09 3.0638759618400E+08 1.0000000824312E+00 5.6138838091929E+09 3.0689498118400E+08 1.0000643453673E+00 5.6138857290693E+09 3.0689504118400E+08 1.0000000911767E+00 5.6723070037427E+09 3.0872070618400E+08 9.9986930012505E-01 5.6723089239937E+09 3.0872076618400E+08 1.0000000815525E+00 5.8319069909780E+09 3.1370820618400E+08 1.0001220852155E+00 5.8319089107437E+09 3.1370826618400E+08 1.0000000839554E+00 5.9404637816299E+09 3.1710060618400E+08 9.9965196646574E-01 5.9404657022983E+09 3.1710066618400E+08 1.0000000716396E+00 5.9798746594751E+09 3.1833219618400E+08 9.9986421521735E-01 5.9798765797358E+09 3.1833225618400E+08 1.0000000758571E+00 6.1149668094883E+09 3.2255382618400E+08 9.9979913296635E-01 6.1149687298740E+09 3.2255388618400E+08 1.0000000670751E+00 6.1940472205698E+09 3.2502508918400E+08 1.0000946134430E+00 6.1940491403882E+09 3.2502514918400E+08 1.0000000701484E+00 6.2942621573584E+09 3.2815680618400E+08 9.9990311607686E-01 6.2942640775444E+09 3.2815686618400E+08 1.0000000648762E+00 6.3545501536333E+09 3.3004080618400E+08 1.0001777964986E+00 6.3545520732920E+09 3.3004086618400E+08 1.0000000796664E+00 6.4045469493091E+09 3.3160320618400E+08 9.9988836898957E-01 6.4045488695234E+09 3.3160326618400E+08 1.0000000790087E+00 6.4545458255732E+09 3.3316567118400E+08 9.9971855457562E-01 6.4545477461138E+09 3.3316573118400E+08 1.0000000601884E+00 6.5696323791870E+09 3.3676212618400E+08 1.0002635378584E+00 6.5696342986812E+09 3.3676218618400E+08 1.0000000649763E+00 6.7585853264038E+09 3.4266690618400E+08 1.0004365918965E+00 6.7585872455659E+09 3.4266696618400E+08 1.0000000677070E+00 7.0455543621362E+09 3.5163468918400E+08 1.0003706716076E+00 7.0455562814248E+09 3.5163474918400E+08 1.0000000707760E+00 7.1620246891816E+09 3.5527438718400E+08 9.9979633665322E-01 7.1620266095728E+09 3.5527444718400E+08 1.0000000666804E+00 7.3143388874165E+09 3.6003420618400E+08 1.0001961138926E+00 7.3143408070400E+09 3.6003426618400E+08 1.0000000736680E+00 7.3329724856675E+09 3.6061650618400E+08 1.0001925521245E+00 7.3329744052979E+09 3.6061656618400E+08 1.0000000920142E+00 9.9869241770967E+09 4.4355250418400E+08 1.2714734296471E+00 9.9869256871558E+09 4.4355256418400E+08 1.0000003296047E+00 1.0023746251020E+10 4.4470320718400E+08 1.0005992663758E+00 1.0023748169870E+10 4.4470326718400E+08 1.0000003546263E+00 1.0071669432875E+10 4.4620080718400E+08 9.9991125258709E-01 1.0071671353046E+10 4.4620086718400E+08 1.0000003481512E+00 1.0123029415166E+10 4.4780580718400E+08 9.9991379527369E-01 1.0123031335331E+10 4.4780586718400E+08 1.0000003437888E+00 1.0207758986203E+10 4.5045360718400E+08 1.0001549006995E+00 1.0207760905905E+10 4.5045366718400E+08 1.0000003435298E+00 1.0265000694242E+10 4.5224241118400E+08 1.0000826586060E+00 1.0265002614083E+10 4.5224247118400E+08 1.0000003496683E+00 1.0552581265526E+10 4.6122930718400E+08 9.9990616725268E-01 1.0552583185706E+10 4.6122936718400E+08 1.0000003397138E+00 1.0624206841375E+10 4.6346760718400E+08 9.9992040631938E-01 1.0624208761527E+10 4.6346766718400E+08 1.0000003397314E+00 1.0654273295313E+10 4.6440718418400E+08 9.9992854311101E-01 1.0654275215451E+10 4.6440724418400E+08 1.0000003309682E+00 1.0805935773256E+10 4.6914663818400E+08 9.9992498324838E-01 1.0805937693400E+10 4.6914669818400E+08 1.0000003303063E+00 ) \begintext End of SCLK file.