Design Of Uplink And Downlink In Satellite Communication

Scientech 2272a satellite communication platform provides an indepth study of basic satellite communication system.

Design of uplink and downlink in satellite communication. In general these calculations are called as link budget calculations the unit of power is decibel. The major frequency bands are 6 4 ghz 14 11 ghz and 30 20 ghz uplink downlink. Low noise amplifier lna amplifies the weak received signal. 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.

These calculations basically relate two quantities the transmit power and the receive power and show in detail how the difference between these two powers is accounted for. 1 the weight of satellite. First let us discuss the basic terminology used in link budget and then we will move onto explain link budget calculations. The downlink chain is built using nearly the same equipment in reverse order.

2 the choice frequency band. 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. Receiving a signal through a leased line customer pop playout server or downlink from satellite. 3 atmospheric propagation effects.

The communication going from a satellite to ground is called downlink and when it is going from ground to a satellite it is called uplink. The satellite can be placed at an elevated position if needed. Take a look at the drawing below and note the path of devices on the left hand. Signal encoding in mpeg 2 sd mpeg 4 sd mpeg 4 hd h 265 hvec sd hd format depending on customer needs.

What are uplink and downlink. This block determines the type of transponder. It receives uplink signal from the satellite antenna and transmits downlink signal to the satellite antenna. The cost of transmitters tend to be high compared with the cost of receiving.

In satellite communication systems there are two types of power calculations. Satellite uplink and downlink analysis and design. 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 description provided here is imprecise as the exact configuration can vary widely.

This chapter describes how the link power budget calculations are made. The uplink design is easier than the downlink since an accurately specified carrier power must be presented at the satellite transponder and it is often feasible to use much higher power transmitters at earth stations than can be used on a satellite. Vivacom provides uplink service for radio and tv channels via different satellite platforms from 40 w to 90 e. Carrier processor performs the frequency down conversion of received signal uplink.

4 multiple access technique.