Abstract Satellite communications makes use of radiofrequency links. Particular frequencies are allocated for satellite communications through international regulatory registration and coordination processes which prevents interference between systems. In typical operation, a satellite’s transponder receives an uplinked signal from Earth, changes its frequency slightly to avoid self-interference, and retransmits it on a downlink to Earth. Antennas provide gain by focusing the transmitted energy. Path loss describes a natural spreading out of the transmitted wave front as it travels through space. A link budget is an accounting of gains and losses throughout a system that is used as a design tool to provide sufficient power (or gain) to allow a satellite connection to be established. The link margin is the excess amount of received signal power above what is required. Shannon’s Law implies that there are trade-offs possible in a communications system design between power, bandwidth, and complexity.
Satellite Radio Communications Fundamentals and Link Budgets
Handbook of Satellite Applications ; 293-324
2013-01-01
32 pages
Article/Chapter (Book)
Electronic Resource
English
Satellite slot , Effective isotropic radiated power (EIRP) , Decibel , Forward error correction , Free space loss , Spectrum , Line-of-sight , Coding , Gain , Signal-to-noise ratio , Bit error rate , Transponder , Bandwidth efficiency , Path loss , Link margin , Wavelength , Shannon’s law , Link budget , Trade-off , Modulation Communications Engineering, Networks , Computer Systems Organization and Communication Networks , Extraterrestrial Physics, Space Sciences , Aerospace Technology and Astronautics , Applied and Technical Physics , Engineering , Satellite Radio Communications Fundamentals and Link Budgets , Remote Sensing/Photogrammetry
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