ANOMALY DETECTIVE GROUND SUPPORT SYSTEM FOR MARS PROBE "NOZOMI" Masashi Hashnoto Instihrte of Space and Astronautical Science (ISAS) 3- 1-1 Yoshinodai. Sagilmihara. Krulagawa 229-85 10. Japan phone: +8 1 42 7i9 8352. fax: +81 42 759 8440. e-mail: 111asas11iYrnnl.isas.acjp Naonu Nislugori S! stems Seclion. Space S! stcn~sDcpt.. S! stelus Engineering Group. Fujitsu Limited 9-3. N;I~;ISC1-chonre. Milr;rm;~-ku.C'l~ib;r-shi. CIUba 261-0023. Jap;n~ pl~o~~c:+X 1 4.3 209 3248. fax. +8 1 43 200-.30 12. c-mil. RHE003.37,~nift!..ne jp hl~tsuehli/uta~r~ Fujitsr~Soc~al S! sle~nsE~lgi~~ccriog Limited 1-22- 1. H~gashigotnnda.Shinagava-ku. Tok! o 14 1-0022. Japan e-n~ail:KYRO3i43 rr nift!.ne jp ABSTRACT 011 the other 1i;uld. strong denrand to suppress or decrease the operating cost exists al~uoste\,cryn-here Il~sl~tuteof Space and Astronautical Science tllcsc da!s and also in ISAS. One of the solutio~~sfor (ISAS) \\as successfull! launched Japan's first hlars these contradictor> rcquire~uenls is to use expert probe "NOZOhlI" on JIII! 4. 1008 In order lo technique in the satellites/sp;~cccrirftoperation ISAS crrable tl~csafe operation of "NOZOhll" tutder the decided to take the expert Icclrruque at first for the sc\ ere c1enl;uncl of the cost reduction. ISAS pro\ ided geo1ll;lglletli obsen lion spacecraft "GEOTAIL" that an anonlal! dctecti\.e gro~undsupport s!stenl nan~ed nas la~ulched in 1092 xtd is still in operation at ISACS-DOC for "NOZOIblI'. operation. This s?stc~u Sag;~~nihar;lSpacecrilft Opcrai~o~lCenter (SSOC) IS the second application of espert technique to &ill This system is named "ISACS-'. jihich stands for operi~tiouof scientific spacecraft at ISAS. Man! Intelligent SAtellite Control Software. ISACS improt.ernents are achieved based on the experiences cor~sists of t~bofunctions: one 1s ISACS-PLaNner of the first expert application to the anomal! detective (ISAC'S-PLN) and the other is [SACS-DOCtor sro~~ndsupport s?stem for the geomagnetic ( [SACS-DOC). IS-4CS-PLN IS an autom;rtic obsen ation spacecraft "GEOT.4IL". Espcciall!. the con~~uandplanner nith expert technique. and ISACS- cor~~nu~~~icatio~~linh lewls can be el alunted nith111the DOC' is ;in anon~alydetecti\-e ground support s!stenI error of ii.OdB111. This perforr~uinceis expected to it d~agnostic functions. ISACS-DOC for be enough to operatc "NOZOh~ll" safel! in the hlars CiEOTAlL Ins bee11 used for 6 !cars III SSOC One tra11sli.r and orbiti~rg phase. Non [SAC'S-DOC of the important hings learned from ISACS-DOC for dngnoses "NOZObII" e\ ery operation. and it can GEOTAIL is that collectio~~of many kinds of \\am about 43) lands of "NOZOMI" abnorn~alit?to infor~uat~onfrom the t arioos kinds of grotmd support the spacecraft operator. s?slcnls like tracking systems. tr;llecton determination s! stem 2nd nttitltde/~nanc~~\~crcontrol s! stcu~s is csscnti;~l to Impro\.c the reliabil~t! of diagnos~s. I. INTRODUCTION ISAS co~~~plctedestabl~slli~~g a II~\\ ground operaliou s! stel11 based on clientiscux n.orkstation s\-stems and 15.4s operirtcs four s~telliles(AICEBONO. YOHKOH. started to use it from Japan's first Marlian probe .AS('A and HALCA) and tvo spacecraft (GEOTAIL "NOZOMI" at SSOC. Figure I shovs tl~coutlu~e of ;rud NOZOhll) on dail? bases at t11c preserlt. the lSAS net\ ground opccrt~on s~stcn~.In this Sc~ent~ficsatellitesispacccrfi ;Ire becoming more configr~ration. useful infor~n;rl~onfrom essential soph~st~cilt~d irccord~ng to morc ad\ awed sc~cutific ground s! stems can e;~sil!. be gatl~crcd through thc Inslrt~rllcntsonboard and the knonledge rcq~urcdlo netnork in real time. ISACS-DOC for "NOZOMI" operate tlle~~~1s also beco~l~ingdeeper and broader \\as det.eloped b!, takmg Ule abotc aduntagc as \\.ell - - I'roc I ~tthlnternatmnal Sympos~umon Art~fic~alIntelhgence, Robottc\ md Automat~onIn Space, 1-3 lune 1999 (ESA Sf'-440) ;IS A1 other cspcric~~cesobtained by ISACS-DOC 2.0UTLINE OF [SACS-DOC FOR "NOZOMI" opcr;rt~on for GEOTAIL. "NOZOMI" nas succcsslilll! laru~hedJul! -I. 19OX fro111 Kagoshima 2.1 Basic-t ~SE&UUDDLIL~Q~~~,> Space Cel~ter(KSC) in Japm and is no\\ flyng to Thc follonlngs ,Ire b,islc ~de,lsIII dwgnmg ISACS- Mars to stud! the stnlcture and d!lianlics of the DOC for "NOZOMI" Some of them ,Ire ~~~trodr~ccd Marfia~~upper atlnosphere \\it11 e~~~ptiasison its b~scd on lcssol~s lennied fro111 [SACS-DOC for Inicr;rctlotl \\it11 solar uind. This paper describes GEOTAIL ISA('S-DOC' ['or "NOZOhll" and reports somc of the (1) All ~nforn~,ir~onlo d~,lgnosc the sp,~cecr,lft1s fed ;~clr~i~loperallo11 results. on-l~nethrough the net\\orh of the IS4S ncn ground operdlon s\ stem she\\ 11 In F Igure 1 (2) Wholc m,is of illc spmxr,~ft Ire repcatodh MA I NFRAME COMPUTER S-TLM S-TLM g OEM SERVER #///////A - ---~- .,% <-ILK I-TLM ,, .............................. .......... -~ . ,, - ~ - DEM : ' SERVER - ~ -~ - : s?: / UDSC64md R vn7znm/nn1 DATA 5 SERVER 4 ii CONTROL $ ilDSCF4m,$ 7/z7////7,/,?-, m////n//nA :: MD-E <T KSC2Om6 :: :r r :: CCN1Ri.L $ UDsC&i j j v///////,/,zASTaTUS MON DATA 7 SER'IER $ 7n/nnn//1 lJDSiB4m 6 DATA-- ~ STORAGE 7/-//m I RWL TIME 9 ORBIT DETERM $ zzm-mrnd STAT ION g CONTROL $ I 7/nnnn/,/n4 S-TLM , S-TLU p DEM SERIER / - 7,n/nm,/& ANT R I - 4 CMD GEN COMMAND - E CONTROL $ m//nm//nA 8, I' : I' ' -, : ORBIT y: : PLANNING % ' ; ;.... ~<<</f<<<</&.. .: I 8 ' Figure 1 ISAS New Ground Operation System d~ag~losed atdomaticall! during real-tin~c is a PC. The SPARC norkstat~onlla~~dles on-lme operatloll. data feeding f~~nction. The on-line data feeding (7) The dragnosis co\-ers almost all areas of the ftniction automaticall!- reads the latest real-time spacecrnft's conumtmication s!stem. electrical tclc~uctndata. orbit and attitude data. and some of the pouer systenl. thermal control system. data ground operation systems' data through the network as Ilandl~ngs! stem. attitude and orbit control s!stenl. shov 11 ul Figure 2. The s! stem configuration of ar~dall sc~entilicinstruments onboard. ISACS-DOC for "GEOTAIL is also slior\.n in Figure (4)Diagnostic results are restricted to higlil! confident 2 for reference. This function also decodes the abo\.e IICIIIS to a\-old conr~~singthe spacecraft operators at data to physical \.nlues if it is necessary. and outputs a SSOC Facts or actual phenomena are onl! diagnostic information file b! referring the Satellite s110\\11~f the infere~iceof the abnoriualit! 1s \-ague. Information Base (SIB) file \\-h~chdefines positions of ( i) Knon ledge database call be casil updated telemetry franics and vords. tl~rcsl~oldulucs. and accord~ngto the IK\\ situation of the sp;~cccr;ift. equations for decoding the dmto ph? sic;ll vAues. etc. (6)C'onl~~iruiicatio~~ links arc carefull! natchcd b! The diagnost~c inforn~ation file is autonlaticall! conipanng the real rccei\.ing le\ els of dou 11-links transferred to the diagnostic fiu~t~onon the PC. The and up-links nith the estinnted \dues which arc PC handles the diapostic function using a calculated fro111 antennas patterns. attit~ldeof the con11uerciall!. a\.;lilable diagnost~c expert tools spacecraft. distance betveen the spacecraft and the package n:uned APSHELL/DIAG 'Manadeshi-kun': ground tracking antenna. performance of the (n~eaninga fm.oritc pupil) n.hich nms in the Microsoft ground station. etc Windons NT en\ iro~unentto reduce the de\-elopnient (7)All data used for dingnosis arc sa\.ed in [SACS- cost. The APSHELLDIAG 'hlanadcshi-~IIII.1~1s DOC and can be used for cl~cck~ngthe past status three standard fi~nctions:knon ledge d:~(abaseed~tor. of the spacecraft. ~nfereocc engine. and knonledge database The S~ncc "NC)ZObII" is a deep space nliss~on. d~agnosticexpert knowledge is horted out as a trce co1111nunic;111onlinks are c\ nluatcd \I ~thhigh accurac! form E~et? condition to icr~l) ;I tree node is In real t~ie Furthermore. electrical current deter~ninedby questions and results. The execution ~nonitoringfor 311 onboard subs! stcnls is introduced 111 of diagnosis is conducted with the fonurd inference designing "NOZOMI" to nuke cllagosing easier. engine tracing the dagosis trce by checking the conditions (truth or falsehood) of each node. The 1.2 St- scale of knowledge database III ISACS-DOC for [SAC'S-DOC for "NOZOMI" conslsts of tno "NOZOMI'. is shown in Table 1 coluputers one 1s a SPARC uorkstat~onand the other ISACS-DOC for "GEO TAIL'' ISA CS-DOC for "NOZOMI " CGWIhlUN/CA TW CONTROL d S C C~NTROL STA'TION REA; TIME ST4 TION CONTROL 0 THERS CONTROL DA 7A SER L'ER MA1 IAN I I BSC I I I II,?INFRAME COMPU TER S C CONT,ROL /SACS-DOC /SACS-DOC DA T4 STORAGE ,A DS ,4D*L IDA TA SERVER) IDIAGNOSISI qllUit ff 6ws r&7 ---- - 0-1T4 MONITOR /SACS-DOC ISACSDOC ORBIT DE TERMINA TlON IDATA SERVERI (DIA GNOs/sI Fimre 2 System Confi~urationof ISACS-DOC Table 1 Scale of Knowledge Database in ISACS-DOC for "NOZOMI" - Conunon Ir~stnunents Sc~ent~ficInstnunents Total 11C'Ll BPS 0 DfIK otl1m 1 P\\.\ It hIIC I\[[ 1lr)C l'l'.\- hLtS (jr~zst~ons ji 80 97 j 6 42 04 52 34 17 16 25 13 590 As nient~oued:ibo\e.