Satellite Uplink And Downlink Model

The downlink chain is built using nearly the same equipment in reverse order.

Satellite uplink and downlink model. Low noise amplifier lna amplifies the weak received signal. 3 the second type downlink jamming disrupts transmissions sent from the satellite to ground based or airborne receivers using rf. Carrier processor performs the frequency down conversion of received signal uplink. This block determines the type of transponder.

It receives uplink signal from the satellite antenna and transmits downlink signal to the satellite antenna. The uplink and downlink frequencies are selectable and can have variety of signals such as video audio voice tone data and telemetry temperature and light intensity. The description provided here is imprecise as the exact configuration can vary widely. Satellite downlink in this process satellite sends the signal and the earth station receives it.

An rf signal of the same frequency as the targeted uplink signal is transmitted to the satellite aiming to limit the satellite transponder from differentiating between the jamming signal and the actual signal. 6ghz band frequency is used for uplink and 4ghz frequency band is used for downlink in c band satellite communication operation. Uplink downlink intersatellite links relay satellite relay satellite relay satellite sensor satellite sensor satellite crossover or intersatellite links mission data launch phase tt c tt c satellite ground station tt c tracking telemetry and control the communications architecture consists of satellites and ground stations interconnected with. The direction from vsats to sallite is known as uplink and the direction from satellite to vsats is known as downlink.

The equation is same as the satellite uplink with a difference that we use the abbreviation d everywhere instead of u to denote the downlink phenomena. The uplink is always the link to the satellite and the downlink is always the link from the satellite irrespective of which side of the link you are teleport hub or vsat remote site. 5925 mhz to 6425 mhz is uplink band where as 3700 to 4200 mhz is downlink band. The satellite transponder receives signal from uplink transmitter and retransmits at different frequencies to a downlink receiver.

When an uplink is being received by the spacecraft at the same time a downlink is being received by earth the communication is called two way. The term uplink chain is used to refer to the series of pieces of equipment that are used to produce a radio frequency signal for sending out data. Inbound and outbound are often referred to as inroute s and outroute s. Take a look at the drawing below and note the path of devices on the left hand.

The operating manual illustrates basic theory and glossary of satellite communication terms along with experiments.