Satellite Glossary: S-Z
Satellite communication terminology and definitions from S to Z.
Satellite Communication Glossary: S-Z
This glossary provides definitions for common terms used in satellite communications. This article covers terms S through Z.
S
SCPC (Single Channel Per Carrier)
An access method where each user is assigned a dedicated, continuous carrier frequency.
SNR (Signal-to-Noise Ratio)
The ratio of signal power to noise power. Often used interchangeably with C/N in satellite communications.
Spot Beam
A focused antenna pattern covering a specific geographic area, allowing frequency reuse across multiple beams.
SSPA (Solid-State Power Amplifier)
A type of HPA using solid-state semiconductor devices (typically GaN or GaAs).
T
TDMA (Time Division Multiple Access)
An access method where users share a frequency channel by transmitting in assigned time slots.
Transponder
A satellite payload component that receives, amplifies, and retransmits signals. Named for its function: TRANSmitter-resPONDER.
TWTA (Traveling Wave Tube Amplifier)
A type of HPA using a vacuum tube for amplification, offering high power and efficiency.
U
Uplink
The transmission path from an Earth station to a satellite.
V
VSAT (Very Small Aperture Terminal)
A class of satellite Earth station with small antennas (typically 0.6m-2.4m), used for enterprise and consumer applications.
Related Articles
- Glossary A-F - Terms A through F
- Glossary G-L - Terms G through L
- Glossary M-R - Terms M through R
- End-to-End Architecture - System overview
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