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I.INTRODUCTIONTOSATELLITENAvIGATION
1.HOWDOESTHESATELLITENAvIGATIONSySTEMWORK?
Satellitenavigationisoneofnavigationmethods(fromLatinnavigatio-
navigation)and,togetherwithremotesensinganddirectbroadcastingsatellite
service,oneofthemostwell-knownspaceactivities.1AccordingtotheUS
NationalAeronauticsandSpaceAdministration(NASA),“Navigationisthe
abilitytodeterminecurrentanddesiredposition(relativeorabsolute)and
applycorrectionstocourse,orientation,andspeedtoattainadesiredposition
anywherearoundtheworld,fromsub-surfacetosurfaceandfromsurfaceto
space.”
2
TheESA’sofficialwebpagehighlightsinturnthat:“(…)navigation
satellitescantellyouwhereyouaretothenearestfewmetresorbetter,
whatevertheweather.Enhancedinstrumentscanevenpinpointtheposition
ofastationaryobjecttowithinafewcentimetresbymeasuringtheobject’s
positionmanythousandsoftimesoverseveralhoursandthenworkingout
theaverageofthemeasurements.”3Aspointedout,satellitenavigationcan
beusedtodeterminethepositionofpointsandmovingobjectsalongwith
1
Theconceptof“satellitenavigation”isnotdefinedininternationalagreements,either
multilateralorbilateral.Thedoctrineusesthisconceptwithoutspecifyingitsmeaningand
interchangeablywithotherterms.TheCologneCommentaryonSpaceLawsimplylistssatellite
navigationamongspaceactivities(HobeS.,ArticleI,in:CologneCommentaryonSpaceLaw,
S.Hobe,B.Schmidt-Tedd,K.-U.Schrogl(eds.),Cologne2009,p.35).I.H.Ph.Diederiks-
VerschoorandV
.Kopalwriteabout“increasinguseofsatellitesfornavigationpurposes”
(Diederiks-VerschoorI.H.Ph.,KopalV.,AnIntroductiontoSpaceLaw,3rded.,Austin2008,
p.67).J.L.VanDeWouwerandF.Lambertemphasizethat“animportantuseofsatellitesis
fornavigationpurposes”(VanDeWouwerJ.L.,LambertF.,EuropeanTrajectoriesinSpace
Law,Luxembourg,Brussels2008,p.78).
2
https://www.nasa.gov/directorates/heo/scan/communications/policy/policy_pnt.html
(9October2017).
3
http://www.esa.int/Our_Activities/Navigation/About_satellite_navigation2(9October
2017).
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