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Upload of Basic Principles of Satellite Communications

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Dr. Mohamed Ibrahim

on 4 September 2016

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Transcript of Upload of Basic Principles of Satellite Communications

Research report about any satellite


- Satellite Mission
- Main specifications
- Payload Type and specifications.
- Communication subsystem specifications
- Orbit
- Owner

2-3 Pages Max
Mohamed Ibrahim, Ph.D
Basic Principles of Satellite
Satellite لTechnology
Agenda
The Origin of Satellites
Communications via Satellite
Satellite Subsystems
Satellite Payload Types
Characteristic Features of Communication Satellites
1957
1958
Recently
1962
1945
1869
The first satellite to relay voice signals
The first active communications satellite capable of two-way communications
Telstar

1
Thuraya series
The Brick Moon
“Extra-Terrestrial Relays: Can Rocket Stations Give World-wide Radio Coverage?”
Edward Everett Hale
The first artificial satellite
Sputnik 1
Telemetry Tracking & Command (TT&C)
Communication Subsystem
Main Function:
Transmits Telemetry data and receives commands/data from the ground station
Sub Functions:

Receiver RF Signal, Demodulation, Decryption , Extract Command/Data
Transmitter RF Signal, Modulation, Encryption , Collect Telemetry Data
Telemetry Tracking & Command (TT&C)
Communication Subsystem
Main Parameters
Dimantions, Mass, Maximum Power Consumption
Minimum& Max Operating Temperature
Uplink Frequency, Uplink Data Rate, Uplink Bandwidth
Downlink Frequency, Downlink Data Rate, Downlink Bandwidth

Modulation Type, Transmitted Output Power
Antenna Gain, Antenna Feeder Loss, Antenna Ploarization
Reliability
Operation mode
Security technique
Attitude Determination & Control(ADCS)
Control Subsystem
Main Function:
Uses sensors and actuators to point the Satellite in the right direction
Attitude Determination & Control(ADCS)
Control Subsystem
Command Data Handling (CDH)
Computer Subsystem
Main Function:
Receives, validates, decodes, and distributes commands to other satellite subsystems


Gathers, processes, and formats satellite housekeeping and mission data for downlink .

Command Data Handling (CDH)
Computer Subsystem
Thermal Control Subsystem (TCS)

Main Function:
Maintain all elements within temperature limits for all mission phases
Structures
Main Function:

Support
a spacecraft’s key components in desirable locations during mission operations and in their stowed configuration within the launch vehicle’s payload envelope

Protect
the spacecraft’s components from the dynamic environments encountered during ground operations, launch, deployment, and mission operations


Deploy
antennas and sensors during the mission and provide enough stiffness to keep them steady while staying light enough for the selected launch vehicle

Keep vibrations from interfering
with the launch vehicle’s control system or the spacecraft’s own on-orbit control systems
Main Function:
Supply a continuous source of electrical power to satellite loads during the mission life.
Control and distribute electrical power to the satellite subsystems
Support power requirements for average and peak electrical load
Provide converters and telemetry capability for EPS health and status.

Electrical Power Subsystem (EPS)

◦Space Situational Awareness
◦Tailored Communication Systems
◦Space Environmental Monitoring
◦Space Based Augmentation for Navigation
◦Earth Monitoring

Satellite Payload
Thanks
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