SUMMARY
Introduction to Satellite Communication Systems • Link Analysis • Satellite Communication Techniques • Multiple Access Techniques • Broadcasting by Satellites • Inter Satellite Links • Satellite Communication Payload • Earth Station Technology
TECHNOLOGY FOCUS
Satellites communications systems have for a long time complemented terrestrial networks for the exchange and delivery of information contents, however with no transparency to the end user. Soon, satellites will be integrated into large hybrid networks for providing communications services to both fixed and mobile terminals, with various degrees of
transparency. Satellites are particularly appealing whenever large coverage is desired, and either collect or broadcasting applications are considered.
Decreasing power and bandwidth costs, high reliability and flexibility for setting up links make satellites unique for specific applications. However, satellites are faced with propagation impairments, limited bandwidth and power, and must be operated to allow access to multiple users without interference. Therefore, from system designer to service
provider, one should understand the specific constraints and opportunities of satellite communications.
COURSE CONTENT
This course presents the techniques that are used and points out the performances that can be expected from geo-stationary satellite systems. Emphasis is placed on the trade-offs that can be exercised within the constraints of technology, regulations and competition. The course is as practical as possible, underlying those techniques that are, or
soon will be in use, with emphasis on performance and economic trade-offs.
The course is designed to provide the attendees with an appropriate background on satellite link design and communications techniques, for analogue and digital signals, including those used for broadcasting.
Multiple access techniques, FDMA, TDMA, and Spread Spectrum CDMA, are presented. Specific techniques in connection with the operation of multibeam satellites are dealt with.
Emerging technologies such as on-board regeneration and inter-satellite links are also discussed.
A detailed overview on satellite communication payload, repeater and antennas, and earth station technology is given.
Satellite communications engineering requires a combination of know-how in many various fields such as radio wave propagation, antennas, and signal processing.
Several practical exercises are to be solved during the course to allow the attendees to practice the acquired knowledge. The design considers economic trade-off and aims at a cost efficient design of the earth segment.
WHO SHOULD ATTEND
Engineers, scientists and technical managers involved in the planning, design and operation of satellite communications systems; designers and technical salesmen concerned with the manufacturing of satellite communication systems equipment; technicians involved in the operation and maintenance of earth station or in the control of the satellite.
COURSE DETAIL
Satellite Communications Systems
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Description of a Satellite Communication System
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Satellite System Overview
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Orbital Mechanics and its effects in Communication Systems
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Communication Service & Transmission Technology
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Analog and Digital Transmissions & Multiple Access Techniques
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Encoding and Forward Error Corrections
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Maintenance and Performance Keeping
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IP Over Satellite System Performance
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Operation and Maintenance Principles.
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Test and Measurements.
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Applications of Communication Satellites
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Satellite Links and Access methods
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Design of The Satellite Link
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Basic of Microwave Link Engineering
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Definition of The Power balance and Path loss
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Additional Link Attenuation Factors
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Rain Attenuation
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Link Budgets
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Downlink Budget
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Uplink Budget
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Overall Link
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Additional Sources of Noise and Interference
Link Analysis
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Carrier and Noise Budget Calculation
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Carrier-to-Noise Power Ratio at the Receiver Input
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Intermodulation and Interference
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Link Budget Calculation & Transponder Management
Multiple Access Systems
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Frequency Division Multiple Access FDMA, TDM/PSK, SCPC
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Time Division Multiple Access and Random ALOHA S-ALOHA
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Time Synchronized Access
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Code Division Multiple Access
Frequency Band Tradeoffs
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L Band
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S Band
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C Band
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X Band
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Ku Band
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Ka Band
Satellite Communication Techniques
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Link Performance Evaluation and Availability Performance Objectives
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Digital Transmission Techniques: BPSK, QPSK, TCM
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Spectral Efficiency
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Use of Channel Coding for Bandwidth and Power Trade-Off
Broadcasting by Satellites
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Use of Satellite Broadcasting
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Feeder Links Options
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Broadcasting of Television
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Sound and Data
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The DVB-S Standard
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System Examples: ASTRA SES, EUTELSAT, WORLDSPACE
Television Distribution and Broadcasting
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Direct to Home TV Broadcasting by Satellite
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Distance Among DTH Systems
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Downlink Frequency
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Significant Differences in Satellite EIRP
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Polarization Selection (LP or CP)
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Frequency Plan Differences (Channel Spacing)
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Transmission Format – Analog (FM) or Digital (QPSK)
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Video Signal Format
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Scrambling
Conditional Access System
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DTH Satellite Design Options
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Medium Power DTH Satellite Systems
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High Power DTH Satellite Systems
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Orbital Interference Limitation
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Digital Video broadcasting (DVB) Standards
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DVB Requirement and Organization
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Relationship Between DVB and MPEG 2 and 3
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The Satellite Standard - DVB-S
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Supporting DVB Services – Sound Services Information and Condition Access
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Issues in Satellite System Management
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Satellite system Implementation
Satellite Communication Payload
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Performance Objectives
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Trade Off Between G/T and EIRP
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Repeater Functions
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Non-Linear Characteristics
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Repeater Architecture: Channelisation Concept, Redundancy
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Characteristics of Repeater Equipments
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Antenna Subsystem Coverage Concepts and Antenna Technology
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Examples of Payloads
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Earth Station Technology
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Workshop :
1.Calculation of Uplink path loss
2.Calculation of Transmit antenna gain
3.Calculation of Transmit EIRP (in dB W)&operating FD
4.Calculation of uplink to noise ratio
5.Calculation of satellite operating down link EIRP
6.calculation of satellite operating band width
7.Calculation of Downlink path loss
8.Calculation of receiver antenna gain
9.Calculation of receiver G/T
10.Calculation of link margin
11. Calculation of Link Loss Budget
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