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Presented by:
DHARAMVEERRoll No. 48120802
PRESENTATIONON
OPTICAL SATELLITECOMMUNICATION
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Communication links between spacecrafts is an important element of spaceinfrastructure, particularly where suchlinks allow a major reduction in thenumber of earth stations needed toservice the system.
Introduction :
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SEVERAL TYPES OF SATELLITE
LEO
MEO GEO
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Originally proposed by Author C.Clarke
Circular orbit above the equator.Angular separation about 2
degree allows 180 satellites.Round trip time to satellite about
0.24 sec.
GEO
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EARLY SATELLITES
Relay - 4000 miles orbit
Telstar
Allowed Line transmission acrossthe Atlantic.
Syncom 2 - First Geosyndronoussatellite.
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LINK DESIGN OF SATELLITE
Wavelength and Polarization
Link Budgets for an asymmetric link
Pointing
Acquisition
Tracking
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DIRECT DETECTION OPTICALTERMINAL
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OVERVIEW OF THE SOUTTERMINAL
The SOUT terminal consists of two main
parts: a terminal head unit and a remote
electronics module (REM). The REM contains the
digital processing electronics for the pointing
acquisition and tracking (PAT) and terminal
control functions together with the
communications electronics.
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OPTICAL ANTENNA
The optical antenna comprises the telescope andcoarse pointing assembly. The CPA uses
stepping motors together with a conventional
spur gear and planetary gear. The total height ofthe optical antenna is a major contributor to the
height of the CPA above the platform which
affects LEO and GEO link.
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OPTICAL ANTENNA
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MAJOR PROBLEMS FORSATELLITES
Positioning in Orbit
Stability
Power
Communication
Harsh Environment
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THANK YOU
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