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Why two separate frequencies are used for uplink and downlink transimission in case of satellite communication?
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What is the transmission from a satellite to an earth-based station?
downlink
What was the purpose of Discovery's last shuttle mission?
From the mission notes: International Space Station crew rotation and assembly of a fourth starboard truss segment (ITS S6) and a fourth set of solar arrays and batteries. Also replaced a failed unit for a system that converts urine to drinking water. The day before expected landing, the crew answered questions from many students including Crista Nishimoto of Stevenson Middle School who asked the question at the space downlink at Punahou School.
What is uplink and downlink?
Uplink and downlink are frequencies Communication from earth station to satellite in uplink and communication from satellite to earth station is downlink Always uplink freq.>downlink freq.
How satellite communication is different from communication relay?
For communication satellites the range is much higher than that of communication relay. Communication Satellite can cover up to several thousands of kilometers. For communication relay, the uplink and the downlink frequency is the same. But for communication satellites the uplink and the downlink frequencies are different in order to avoid interference.
Why must a satellite have distinct uplink and downlink frequencies?
To avoid interference
Define downlink frequency?
In the sense of a mobile communication: Downlink frequency is that used by a base station to communicate with the Mobile. In satellite communication also the same theory exists downlink is the return path.
What is the frequency range in satellite communication?
The satellite transponder typically works in either the C-band (4-8GHz) or the Ku-band (12-18GHz) and these are for the downlink (from the satellite to the earth station).
Why is satellite communication not widely used for mobile communication.?
In satellite communication uplink (transmission of signal from earth station to satellite ) & downlink (reception of signal from satellite to earth station) takes place TX & RX involves a finite amount of delay which is acceptable in data communication, but i audio & video TX this delay is unacceptable, overlapping/ alaising causes errors which demodulated by qpsk.
Why uplink frequency is kept higher than downlink freqquency in satellite communication?
due to path loss : higher is the frequency higher is the patrh loss
What is the transmission from a satellite to an earth-based station?
downlink
What is duplex spacing?
Duplex distance/spacing is the distance between the uplink and downlink frequencies
What is uplink frequency?
Uplink frequency is a frequency that goes from the ground to the satellite. Downlink frequency goes from the satellite to the ground.
Why there is an difference in uplink and downlink frequencies in satellites?
It is much easier to build a satellite transponder using different frequencies for the two directions (frequency division duplex, FDD). A single frequency (time division duplex, TDD) satellite link is possible, but then all earth terminal must be carefully synchronized. The satellite transponder and the earth terminals would be more expensive, the whole network would be more complex and less reliable. There is also a historical reason. Frequency bands were allocated decades ago and changing them would be very difficult. FDD and TDD terminals cannot coexist in the same geographical area.
Who is slower satellite uplinks or downlinks?
downlink becouse frequncy / power low compare to uplink
