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 ; 431-462
2nd ed. 2017
01.01.2017
32 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Bandwidth efficiency , Bit error rate , Coding decibel , Effective isotropic radiated power (EIRP) , Forward error correction , Free space loss , Gain line-of-sight , Link budget , Link margin , Modulation path loss , Satellite slot Shannon’s law , Signal-to-noise ratio , Spectrum , Trade-off , Transponder , Wavelength Engineering , Aerospace Technology and Astronautics , Applied and Technical Physics , Remote Sensing/Photogrammetry , Computer Applications in Chemistry , Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics) , Communications Engineering, Networks
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