
Communications Satellites
The Technology of Space Communications
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Communications Satellites: The Technology of Space Communications focuses on the technologies and approaches employed in communications satellites. The book first tackles geosynchronous orbit, low orbit to geosynchronous altitude, disturbances in orbit, and turning a crate into a satellite. Topics include thermal and electrical power, station-keeping, and 'pointing'. The publication then ponders on on-board communications equipment, logarithms and decibels, and radio frequencies and wavelengths and their allocations. Discussions focus on fixed, broadcast, and mobile services, complete satellite, transponders, and antennas. The manuscript examines earth stations, traffic capacity and quality, selecting a satellite, and economic system optimization. Compression and modulation techniques, echo and delay, encryption, space loss, estimation of traffic capacity and quality, and up-link transmission are discussed. The text then elaborates on the economics of satellite communications and operational systems. The publication is valuable reference for readers interested in the technologies and approaches involved in communications satellites.
Table of Contents
Preface
List of Photographs
Acknowledgments
Introduction
1 Getting a Crate into Orbit
2 The Geosynchronous Orbit
3 From Low Orbit to Geosynchronous Altitude
4 Disturbances in Orbit
5 Turning a Crate into a Satellite
Station-Keeping
Pointing
Electrical Power
Thermal Control
Nearly a Working Satellite
6 On-Board Communications Equipment
Transponders
Antennas
The Complete Satellite
7 Logarithms and Decibels
8 Radio Frequencies and Wavelengths, and their Allocations
9 Coverage, Gain and EIRP
10 Earth Stations
Types, Construction and Sizes
Performance
Up-Link Transmission
Pointing an Earth Station
11 Traffic Capacity and Quality
Quality
EIRP and G/T
Space Loss
Boltzmann’s Constant
Capacity
Other Losses
Estimating Traffic Capacity and Quality
Worked Examples
12 Selecting a Satellite
13 Economic System Optimization
Access Methods
Modulation Techniques
Compression Techniques
Encryption
Echo and Delay
14 Encryption
One-Way Functions
Modulo Arithmetic
Example of Encryption and Decryption
Scrambling
15 Operational Systems
16 The Economics of Satellite Communications
Satellite Prices
System Prices
System Income and Profit
User Profit
17 Future Trends
Further Reading
Appendix Manufacturers and Owners
Index
Product details
- No. of pages: 176
- Language: English
- Copyright: © Butterworth-Heinemann 1987
- Published: May 18, 1987
- Imprint: Butterworth-Heinemann
- eBook ISBN: 9781483140704