What is transponder frequency?
In a transponder the transmit carrier frequency is derived from the received signal. The frequency linkage allows an interrogating ground station to recover the Doppler shift and thus infer range and speed from a communication signal without allocating power to a separate ranging signal.
What is the frequency range of satellite communication method?
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.
What are transponders in satellite systems?
The term “satellite transponder” refers collectively to a transmitter-receiver subsystem on board the satellite that processes, amplifies and retransmits a range of frequencies (the transponder bandwidth) to another location/terminal/antenna on the earth.
What is the main function of transponder in satellite communication?
In a communications satellite, a transponder gathers signals over a range of uplink frequencies and re-transmits them on a different set of downlink frequencies to receivers on Earth, often without changing the content of the received signal or signals.
How many transponder does a satellite have?
A typical satellite has up to 32 Ku-band or 24 C-band transponders, or more for Ku/C hybrid satellites.
What are the types of transponder?
There are three main types of transponders: A, C, and S. Transponder S: sends transponder code, altitude information, to ATC and receive and reports information to other transponders of the same type. Transponders need to have 4096 capabilities.
What are the frequency bands used in satellite communication networks?
Satellite frequency bands
- L-band (1–2 GHz) Global Positioning System (GPS) carriers and also satellite mobile phones, such as Iridium; Inmarsat providing communications at sea, land and air; WorldSpace satellite radio.
- C-band (4–8 GHz)
- X-band (8–12 GHz)
- Ku-band (12–18 GHz)
- Ka-band (26–40 GHz)
Which frequency band Cannot be used in satellite communication?
Which of the following bands cannot be used for satellite communication? Explanation: MF is a lower frequency band than Ku, C and X bands and does not lie in the microwave spectrum. Microwaves are used for satellite communication since the lower bands get reflected by the ionosphere. 8.
What are types of transponder?
How many transponders does a satellite have?
A typical satellite has up to 32 Ku-band or 24 C-band transponders, or more for Ku/C hybrid satellites. Typical transponders each have a bandwidth between 27 and 50 MHz.
How does the transponder work?
A transponder will send an identifying coded signal in response to a transmitted interrogation from a ground-based radar station. An air traffic controller can then view the identified blip on a screen and know who it is and provide direction to the flight crews maintaining adequate separation with other blips.
How many types of satellite communication are there?
There are three types of communication services that satellites provide: telecommunications, broadcasting, and data communications.