Tltc Basicsof GPS

GPS.or GlobalPositioningSysternis. a satellitenavigationsystem designedto provideworldwidepositioningandtirneinfbrmationwith all weathercapabilityquick. responsetime andaccuracytctwithin severalyards.GPSis maintainedby the UnitedStatesDepartmentof Defense2rl hoursa day.

GPSwill be a systemol - 24satellitesorbitingat an altitudcveryhigh abovetheearth .Becauseof thegreataltitudethe.satcllitcs'signals arenot interl-eredwith by theterrainor geographvand. thehigh

fiequencyof thesignals(l - 57 -MHz)5 resultsin practicallvno interencefrom shipboardcnginesor otherelectrcnicsvstems.

GPSusestheprincipleof rangingto givc vr)uvr)urpositionThis. is doneby measuringthedistancefrom your positionto thepositionof at leastthreesatellitesThe. distanceto a satelliteis calculatedbv measuringhow long it takesradiosignalsto arrivcfroln thekrrown positionof eachof therespectivesatellitesin theirorbits.

The satellitesandtheStar Pilot 6 mustbe preciselytintedto generate theexactsameradiosignalat theexactsametime in orderto mcasure thetirneanddistancccalculationswith a high degreeof accuracy.

Thisis accomplishedby theuseof atomicclockson all thesatellitcs . andby comparingwhatpartof theradiosignalcodeis recervcdat the exactsametime fiom all the satellites.

To completeits calculationsfilr your position.theStar Pilot 6 looks up ir-rits databasetheknown positiono1'eachof thesatellitesat that exacttime.Becausethc GPSsatellitesarein sucha high orbit.their

positionsat any tinrearequitepredictableNow. . all theStar -eiven

Pilot 6 needsto do is calculateall thisfor threeor firursatcllitcs everyf-ewsecondsand. you havecontinuouspositionupdatingl

GPSsatellitesareconstantlymonitoredby Departmentof Def'ense groundstationsSatellite.clocksandexactpclsitionininfbrmationis computedandany variationsarenotedor correctedasneccssaryand. transmittedto theappropriatesatellites.

WARNING: As of April 1992,thereare 16workin-esatellitesin orbit . Full implementationof 2l satcllites(andthreespareslis currentlypro.ycctedfbr 1993. Usersarecautionedthatthe systcmis still in an experimentaloperationalstatusandthe systemmay be turnedoff or satellitesmovedat any time.withoutwarning. DO NOT placeyourselfor your vcsselin a situationwhereGPS is your solemeansof navigation.Checkwith theCoastGuardtor currcnt operationalslalu\andmessages .

WARNIN(i: SelectiveAvailability(S/A) hasbeenimplemenredby theU.S.DOD to restricttheaccuracyof GPSpositions.As of April 1992.theaccuracyof theGPSsystemis suchthat95% of thetime a fix will be within 100rnetersof theactualgeographicposition.

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Star Pilot 6 specifications

Interphase Tech Star Pilot 6 is an advanced space exploration vessel designed to revolutionize interstellar travel. This state-of-the-art spacecraft combines cutting-edge technologies with exceptional performance, making it a benchmark for future space missions.

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