What is uplink and downlink frequency in satellite communication?
What is uplink and downlink frequency in satellite communication?
The frequency with which, the signal is sent into the space is called as Uplink frequency. Similarly, the frequency with which, the signal is sent by the transponder is called as Downlink frequency. Uplink frequency is the frequency at which, the first earth station is communicating with satellite.
What is the uplink frequency of satellite?
satellite communications …to operate in the so-called C band, which employs uplink/downlink frequencies of 6/4 gigahertz, or in the Ku band, in which uplink/downlink frequencies are in the range of 14/11 gigahertz.
What is the frequency of satellite communication?
Satellite Communication (satcom) is based on a specific range of frequencies. The useable radio spectrum ranges from 1Ghz to 300Ghz, where its use for communications ends as the signal becomes infrared, X-Ray and visible light. For maritime satcom, we use the frequencies from 1Ghz up to approx. 30Ghz.
What is a satellite downlink?
It is a telecommunications link for signals coming to the earth from a satellite, spacecraft, or aircraft. In satellite communications, downlink simply refers to the process when a satellite beams down information toward earthbound terminals or devices. The term is used in the same way in computer networking.
What is downlink frequency is used in satellite communication?
In satellite telecommunication, a downlink is the link from a satellite down to one or more ground stations or receivers, and an uplink is the link from a ground station up to a satellite….downlink and uplink.
| Frequency Band | Downlink | Uplink |
|---|---|---|
| C | 3,700-4,200 MHz | 5,925-6,425 MHz |
| Ku | 11.7-12.2 GHz | 14.0-14.5 GHz |
| Ka | 17.7-21.2 GHz | 27.5-31.0 GHz |
Why uplink frequency is higher in satellite communication?
In satellite communication, the uplink frequency is higher than the downlink frequency because the attenuation level increase with an increase in frequency. The power at the ground station (Base Station) is more than compared to the power available at the satellite.
What are the frequency range?
Frequency Bands and Applications
| Frequency Band Name | Acronym | Frequency Range |
|---|---|---|
| Medium Frequency | MF | 300 to 3000 kHz |
| High Frequency | HF | 3 to 30 MHz |
| Very High Frequency | VHF | 30 to 300 MHz |
| Ultra High Frequency | UHF | 300 to 3000 MHz |
What is VSAT frequency?
VSATs are generally distinguished from the other types of earth stations by the use of smaller antenna apertures, which are nonetheless capable of operating with closely spaced satellites. They are most often designed to operate in the 6/4 GHz, 14/11-12 GHz and 30/20 GHz frequency bands.
What is the function of satellite?
Satellites provide in-flight phone communications on airplanes, and are often the main conduit of voice communication for rural areas and areas where phone lines are damaged after a disaster. Satellites also provide the primary timing source for cell phones and pagers.
What is meant by downlink?
: to transmit (data) from a spacecraft or satellite to a receiver on earth.
Why uplink frequency is more than downlink?
Why is high frequency used in satellite communication?
The high frequency radio waves used for telecommunications links travel by line of sight and so are obstructed by the curve of the Earth. The purpose of communications satellites is to relay the signal around the curve of the Earth allowing communication between widely separated geographical points.
What’s the difference between a satellite uplink and a downlink?
However, when the satellite transmits the achieved uplink signal back towards the ground then it is known as a downlink. The frequency of the signal during uplink and downlink is known as uplink frequency and downlink frequency respectively. It is to be noted here that uplink and downlink frequencies must be different.
What are the uplink and downlink frequencies of radio?
These are Ka, Ku, X and C. Consumer broadcasts and publicly operated companies rely on Ka and Ku bands, which operate between 10.9 and 20 gigahertz downlink. This is referred to as the high frequency band of radio wave transmission, as the waves used to transmit signals are very close together.
What’s the difference between uplink and downlink in GSM?
In GSM network, the packet transmission from MS to BTS is known as uplink where as from BTS to MS is known as downlink. In GSM frequency range from 890 MHz to 915 MHz is used as uplink frequency where as 935 MHz to 960 MHz is used as downlink frequency.
What are the requirements for satellite downlink design?
Requirements for Downlink Design: In the downlink configuration, the transmitting antenna for sending the downlink signal and amplifier is present at the satellite itself. Due to this, the overall size of the antenna and amplifier get limited.
