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detectionformer soviet, communistarmed reconnaissanceorbital altitude, imagingoverhead reconnaissancetv broadcasting, broadcast, series, monitor, show, commercial, satellitewarning radartelecommunication satellite, technology, applicationssophisticated navigational, radar, technology, telecommunications, surveillanceorbit altitude, satellitenavigational satellite, usespositioning satellite, themselvescurrently available, serving, activesoviet sputnik, spy, military, communist, armed, satellite, mannedexplorer satelliteleo satellitesmaller sizedbroadcasting satelliteremain stationary, passive, tethereddistant future, planet, skiesusing landsatadvanced technology, industrial, telecommunications, telecommunication, gpsoperated continuouslybeam axis, spotaxis stabilized, synchronousvibrational bandminor axis, planetresolution imagingstabilized satellite, laserenemy radar, reconnaissancecommercial broadcasting, television, applications, radiolocated adjacent, nearbyspace geodetic, traveloperate continuously, simultaneouslyamerican meteorologicalmilitary intelligence, reconnaissanceenvironmental monitoringoperational meteorologicalband radarpowered laser, radio, satellite, flyingdefense meteorological, intelligencevoyager spacelarger sizedseveral dozenbegan circlingresources availablecommunist spyicy weatherpassing overheadcivilian defense, irregularbecame knownindustrial applicationsfewer resourceslarge sized, measuredifferent sizedcommunication overhead, satellite, technologyits attendantmere passiveserving aboardpositioned themselves, adjacenteuropean telecommunications, telecommunicationgathering intelligence, spotregular monitoring, attendantremaining stationaryrequire additionalsmall sizedtypically revolve, contain, requiretransmit simultaneously, powersimultaneously transmitadditional resourcesprovide additionalcontain numerous, fewerobservation satellitescientific americanpower generationmajor axisseven planetaryexperimental observationlesser knownregional transitmonitor continuouslytwo dozentransit satellitecarried aboard