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

2. 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.

4. SEVERAL TYPES OF SATELLITE
LEO
MEO
GEO

5. 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.

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

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

10. DIRECT DETECTION OPTICAL TERMINAL

11. 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.

13. 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.

14. OPTICAL ANTENNA

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

16. THANK YOU