OPTICAL SATELLITE COMMUNICATION PRESENTATION ON OPTICAL SATELLITE COMMUNICATION Presented by: DHARAMVEER Roll No. 48120802

Introduction: Communication links between space crafts is an important element of space infrastructure, particularly where such links allow a major reduction in the number of earth stations needed to service the system.

SEVERAL TYPES OF SATELLITE LEO MEO GEO

GEO 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.

EARLY SATELLITES Relay - 4000 miles orbit Telstar Allowed Line transmission across the Atlantic. Syncom 2 - First Geosyndronous satellite.

LINK DESIGN OF SATELLITE Wavelength and Polarization Link Budgets for an asymmetric link Pointing Acquisition Tracking

DIRECT DETECTION OPTICAL TERMINAL

OVERVIEW OF THE SOUT TERMINAL 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.

OPTICAL ANTENNA The optical antenna comprises the telescope and coarse pointing assembly. The CPA uses stepping motors together with a conventional spur gear and planetary gear. The total height of the optical antenna is a major contributor to the height of the CPA above the platform which affects LEO and GEO link.

OPTICAL ANTENNA

MAJOR PROBLEMS FOR SATELLITES Positioning in Orbit Stability Power Communication Harsh Environment

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