NASA Technical Reports Server (NTRS) 20160011970: NGSLR Operations Manual: Operating the Next Generation Satellite Laser Ranging System

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by  NASA Technical Reports Server (NTRS)

NGSLR Operations Manual
Operating the Next Generation Satellite Laser Ranging System
Jan McGarry, NASA/GSFC/694
Version 1.0
January 2014
NASA-NGSLR-OPS-Manual

NGSLROperationsManual Preface
Table of Contents
TABLEOFCONTENTS I
ACKNOWLEDGEMENTS V
INTRODUCTION 1
1 SAFETYCONSIDERATIONSANDREQUIREMENTS 3
1.1 ELECTRICALHAZARDS 3
1.2 RADIOFREQUENCYHAZARDS 3
1.3 EYESAFETY/LASERHAZARDS 4
1.3.1 OUTDOORLASERHAZARDS 4
1.3.2 INDOORLASERHAZARDS 4
1.4 LASERSAFETYREQUIREMENTS 6
2 OPERATIONSREQUIREMENTSANDEMERGENCYPROCEDURES 8
2.1 OPERATIONALCONSIDERATIONS 8
2.1.1 DESCRIPTIONOFBASICRANGINGOPERATIONS 8
2.1.2 REASONSTOSTOPTRACKING 9
2.1.3 SYSTEMREADINESS 9
2.1.4 EQUIPMENTTOBELEFTRUNNING 9
2.1.5 TEMPERATURESTABILITYINSIDETHESHELTER 10
2.1.6 COORDINATIONWITHOTHERONSITESPACEGEODESYTECHNIQUES 10
2.2 LHRS/IOCVERIFICATION 11
2.3 CREWREQUIREMENTSFORFAACOMPLIANCEATNGSLR 11
2.4 INCASEOFIMPROPERFUNCTIONOFLASERSAFETYEQUIPMENT 12
72.5 INCASEOFLASERHAZARDEVENT 12
2.6 EMERGENCYPROCEDURES 13
2.6.1 EMERGENCYCONTACTINFORMATION 13
2.6.2 INJURY/IMMINENTDANGERTOPERSONNEL 13
2.6.3 LASERHAZARDEVENT/CLOSECALLS 13
3 PREPARINGFORTRACKINGOPERATIONS 14
3.1 INITIALPREPARATIONS 14
3.2 POWERUPSEQUENCE 15
3.3 TURNINGONSUPPORTINGEQUIPMENT 24
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3.4 SAFETYPROTOCOLPRIORTOTURNINGONTHESLRLASER 26
3.5 POWERINGUPANDSTARTINGTHESLRLASERCONTROLLER 27
4 PERFORMINGTRACKINGOPERATIONS 29
4.1 GROUNDCALIBRATION 29
4.2 SATELLITETRACKINGPROCESS 34
5 ROUTINEALIGNMENTVERIFICATION 38
5.1 PERFORMINGASTARCALIBRATION 38
5.1.1 STARCALIBRATIONPROCEDURE 38
5.1.2 VERIFYINGTHEADJUSTEDPOINTINGBIASESPRODUCEDBYTHESTARCALIBRATION 41
5.2 PERFORMINGASTARASSESSMENT 44
6 PERFORMINGMINICOANDSTABILITYTESTS 45
6.1 PERFORMINGAMINI COLLOCATION(MINICO) 45
6.2 PERFORMINGASTABILITYTEST 49
7 SHUTTINGDOWNTHESYSTEM 52
8 MOSTCOMMONERRORSANDTHEIRRESOLUTIONS 55
8.1 GETTINGTHE(cid:862)MET(cid:863)ERRORMESSAGEONPOPFORLONGERTHAN10MINUTES 55
8.2 NOIMAGEONTHEMONITORFORTHETELESCOPECAMERA 55
8.3 MOUNTWON(cid:859)TDRIVE/MOUNTDUMPS(ELEVATION>90°) 56
8.4 THELASERISFIRING,BUTTHERATDISPLAYSHOWSLASERFIRESAREZERO(F=0) 56
8.5 THELASERWON(cid:859)TFIRE 56
8.6 SYSTEMISNOTGETTINGRETURNS 60
8.6.1 NORETURNSDURINGGROUNDCALIBRATIONS 60
8.6.2 LOWRETURNRATEDURINGAGROUNDCALIBRATION 60
8.6.3 NORETURNSDURINGSATELLITETRACKING 61
8.7 THESOFTWAREAPPEARSTOHAVECRASHED/ISNON RESPONSIVE 61
8.7.1 HOWTODOASOFTREBOOTONPOP 61
8.7.2 HOWTODOAHARDREBOOTONPOP 62
8.7.3 HOWTODOASOFTREBOOTONDAM 62
8.7.4 HOWTODOAHARDREBOOTONDAM 62
8.7.5 REMOUNTINGTHEDISKDRIVESONPOPANDDAM 63
8.7.6 HOWTODOASOFTREBOOTONRAT 63
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8.7.7 HOWTODOAHARDREBOOTONRAT 63
8.7.8 HOWTODOASOFTREBOOTONTHECAMERACOMPUTER 63
8.7.9 STARTINGNFSAFTERTURNINGON/REBOOTINGTHECAMERACOMPUTER 64
8.8 EVENTTIMERRESETS 65
8.8.1 EVENTTIMERCONTINUALLYRESETS 65
8.9 DOMEWON(cid:859)TOPENORCLOSE 66
APPENDIXA:ACRONYMS 67
APPENDIXB:NGSLRLASERRANGINGLOGSHEET 68
APPENDIXC:ALERTSTATUSES 69
APPENDIXD:MEASURINGTHELASERPOWER 70
APPENDIXE:MEASURINGTHESTARTDIODEVOLTAGE 72
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Acknowledgements
Removed(jlfm)
ThedevelopmentofNGSLR(formerlySLR2000)isfundedthroughtheScienceMissionDirectorateatNASAHeadquarters.
ThisprototypeisbeingdevelopedbytheSpaceGeodesyProjectatGoddardSpaceFlightCenterincooperationwiththe
LaserRemoteSensingLaboratory,bothpartoftheSolarSystemExplorationDivisionatGoddard.
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NGSLRtrackingatnight
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Introduction
NASA(cid:859)sNextGenerationSatelliteLaserRanging(NGSLR)stationistheprototypeforNASA(cid:859)snewSatelliteLaser
Ranging(SLR)systemswhichwillbedeployedaroundtheworldinthecomingdecade.Theprototypeislocated
attheGoddardGeophysicalandAstronomicalObservatory(GGAO),oneofGoddardSpaceFlightCenter(cid:859)ssecure
satellitefacilities.NGSLRwillbeasemi autonomous,singlephotonsensitiveSLRstationwithanexpectedshot
toshotabsoluterangeaccuracytoLAGEOSofbetterthan1centimeterandanormalpoint(time averaged)
rangeprecisionbetterthan1millimeter.
Whenoperational,thesystemwillprovidecontinuous,24 hourtrackingcoveragetoanexistingconstellationof
approximatelytwodozenartificialsatellitesequippedwithpassiveretroreflectorarrays.
Whendeployed,thesestationswillbeplacedsothattheyhavefullaccesstobothinternetandphone
communication,witheachsystemcommunicatingregularlytoanexternalfacility(calledHome). Itisfromhere
thatthestationwillobtainthesatellitepredictiondatafortheweek,receivethetrackingpriorityofsatellites,
andsendinformationonsystemhealthandperformance.TheHomeFacilitywillsendtechniciansperiodically
and/orwhenthesystemneedsrepair. Thereisalsoexpectedtobea(cid:862)caretaker(cid:863)presentmostofthetimeat
eachfacilitywhowillmonitorthesystemanditsoperations.
NGSLRincorporatesseveralkeydevelopmentsthatareunique.Forinstance,existingNASASLRstationsrequire
operatorstodeterminesystemviability,avoiddirectcontactofthelaserbeamwithaircraftandground
personnel,decidewhatobjectstotrack,andinteractivelyacquireandtrackthoseobjects.However,theNGSLR
prototypewillbesemi automated,performingmanyoftheabovetasksautomatically,includingincorporatinga
provenlaserhazardreductionsystem(LHRS)topreventthelasingofaircraft.Inaddition,NGSLRusesalow
powerbeamcoupledwithahighfirerate(2000Hz),whichhasthedualbenefitofallowinglowerperpulselaser
energylevels,whileincreasingthenumberofpossiblereturnsperunittime,henceenhancingthenormalpoint
precision. Thistechniquecreatesahigherreturnrateperunittime,producingfinaldataproductsthatarethe
sameorbetterthanthosefromlegacyNASASLRsystems.
Inadditiontothenormal2 waysatellitelaserranging,theNGSLRsystemiscapableofsupportingothertypesof
laserranging,including1and2 wayasynchronoustransponderranging.Currently,theNGSLRprototypeis
supporting1 waylaserrangingtotheLunarReconnaissanceOrbiter(LRO),anuplinkonlyrangewhereNGSLR
recordsthelaserfiretimes,andthespacecraftrecordsthereceiveevents.Analystsformrangesafterthepass
bycorrectlyassociatingfireswithreceiveevents.FurtherdetailsontheLROoperationsatNGSLRcanbefound
in:LaserRangingtotheLunarReconnaissanceOrbiter(LRO)fromNASA(cid:859)sNextGenerationSatelliteLaser
RangingStation(NGSLR),(NASA NGSLR OPS LRO).1
1Furtherinformationcanalsobefoundinvariouspapersandpresentationsincluding:
Zuber,etal.(2010);Maoetal.(2010);Clarkeetal.(2008);Mallama(2008);McGarryetal.(2008);McGarry&Zagwodzki(2009)
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OverviewoftheDocument
ThepurposeofthisdocumentistoprovideinstructionsforoperationoftheNGSLRsystem.
Thisdocumentwill:
Describethegeneralconfigurationofthesystem
Layoutproceduresforsystempower upandshutdown
Walktheoperatorthroughthenormalsequenceofeventsintrackingoperations
Describeregularlyperformedcalibrationprocedures
Listthemostcommonerrorsandtheirresolutions
Allstepsarelistedinanumberedhierarchy,andbeginwithasummaryofwhatistobeaccomplishedduring
eachstep,followedwithabriefdescriptionofhowtoperformthetask,alongwithanypertinentnotes,
warnings,andtroubleshootingsteps.Thenumberandthesummarydescriptionofeachstepmatchthesteps
listedintheoperationschecklistincludedintheappendixofthismanual.
Examplelayoutofprocedures
Step number
Summary of Step Detailed description
1. FillouttheOperationsLog(cid:884)Atthecommencementofyourshift,fillouttheNGSLROperationsLog,as
showninAppendixB.Makesuretokeepthislogsheetinaconvenientplace,asyouwillcontinueto
enteradditionalinformationwitheachpass/groundcalibrationthatisperformed.
2. CalltheFAA(cid:884)InformtheFAAofpendingoperationsimmediatelyafterbeginningtheoperationslog.
a. CalltheFAA.(Seethepostingintheshelterforthecurrentnumber)
b. Saysomethingsimilarto:
(cid:862)ThisisJoeSmithattheGoddardSpaceFlightCenter.Iamcallingtoinformyouthatweare
commencinglaserrangingoperations.(cid:863)
c. WritedownthenameofpersonspokentoalongwiththetimeintheOperationsLog.
Thefollowingsymbolsareusedtoidentifycertaintypesofhazardsthatexistwithinthesystem,alongwith
procedurestomitigaterisk.Compliancewiththeriskmitigationproceduresidentifiedinthisdocumentand
NASAsafetyguidelinesaremandatory.
Possiblesafetyhazardorpotentialdamagetoequipment.
Possiblelasersafetyhazard.
Possibleelectricalhazard.
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