JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Analog and Digital Communications

Course Objectives :

• To acquired foundation in orbital mechanics and launch vehicles for the satellites.
• To provide basic knowledge of link design of satellite.
• To understand multiple access systems and earth station technology
• To understand the concepts of satellite navigation and GPS.

Course Outcomes

Upon completing this course, the student will be able to

• Understand basic concepts and frequency allocations for satellite communication, orbital mechanics and launch vehicles.
• Envision the satellite sub systems and design satellite links for specified C/N.
• Understand the various multiple access techniques for satellite communication systems and earth station technologies.
• Known the concepts of LEO, GEO Stationary Satellite Systems and satellite navigation

UNIT - I

Introduction: Origin of Satellite Communications, Historical Back-ground, Basic Concepts of Satellite Communications, Frequency Allocations for Satellite Services, Applications, Future Trends of Satellite Communications. Orbital Mechanics and Launchers: Orbital Mechanics, Look Angle determination, Orbital Perturbations, Orbit determination, Launches and Launch vehicles, Orbital Effects in Communication Systems Performance.

UNIT - II

Satellite Subsystems: Attitude and Orbit Control System, Telemetry, Tracking, Command And Monitoring, Power Systems, Communication Subsystems, Satellite Antennas, Equipment Reliability and Space Qualification.

UNIT - III

Satellite Link Design: Basic Transmission Theory, System Noise Temperature and G/T Ratio, Design of Down Links, Up Link Design, Design Of Satellite Links For Specified C/N, System Design Examples. Multiple Access: Frequency Division Multiple Access (FDMA), Inter modulation, Calculation of C/N, Time Division Multiple Access (TDMA), Frame Structure, Examples, Satellite Switched TDMA Onboard Processing, DAMA, Code Division Multiple Access (CDMA), Spread Spectrum Transmission and Reception.

UNIT - IV

Earth Station Technology: Introduction, Transmitters, Receivers, Antennas, Tracking Systems, Terrestrial Interface, Primary Power Test Methods.

UNIT - V

Low Earth Orbit and Geo-Stationary Satellite Systems: Orbit Considerations, Coverage and Frequency Consideration, Delay & Throughput Considerations, System Considerations, Operational NGSO Constellation Designs. Satellite Navigation & Global Positioning System: Radio and Satellite Navigation, GPS Position Location Principles, GPS Receivers and Codes, Satellite Signal Acquisition, GPS Navigation Message, GPS Signal Levels, GPS Receiver Operation, GPS C/A Code Accuracy, Differential GPS.

TEXT BOOKS:

• 1. Satellite Communications – Timothy Pratt, Charles Bostian and Jeremy Allnutt, WSE, Wiley Publications, 2nd Edition, 2003.
• 2. Satellite Communications Engineering – Wilbur L. Pritchard, Robert A Nelson and Henri G. Suyderhoud, 2nd Edition, Pearson Publications, 2003.

REFERENCE BOOKS:

• 1. Satellite Communications : Design Principles – M. Richharia, BS Publications, 2nd Edition, 2003.
• 2. Satellite Communication - D.C Agarwal, Khanna Publications, 5th Ed.
• 3. Fundamentals of Satellite Communications – K.N. Raja Rao, PHI, 2004
• 4. Satellite Communications – Dennis Roddy, McGraw Hill, 4th Edition, 2009.