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. Some companies sell uplink and downlink services to television stations, corporations, and to other telecommunication carriers.

Uplink Design:  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.

Why satellite link design is done?

The link communication between satellite and the Earth Station is exposed to a lot of impairments such as noise, rain and atmospheric attenuations. The successful implementation of satellite communications need to the efficient system design to ensure robust air links for the communications signals.

### Which of the losses are considered in satellite link design?

Antenna misalignment losses The alignment of the earth station and satellite link antenna must provide maximum gain value. So, whenever there is some kind of mismatching in the alignment of the two then such losses are regarded as antenna misalignment losses.

How do you design a satellite communication link?

Link Design Process 1. Define Requirements for each link 2. Design Each Link – Select frequency – Select modulation & coding – Apply antenna size & beam width constraints – Estimate atmospheric, rain attenuation – Estimate received noise, interference power – Calculate required antenna gain & transmitter power 3. Size the Payload

What does it mean when a satellite is uplinked?

Satellite links allow us to enable communication over large distances. The operation can be understood as Uplink denotes a link, up from earth station to satellite. When uplink is taking place then such satellite communication is referred to as Upload.

#### What is the power density of a downlink?

Design, Working and Equation for carrier to noise power density of Downlink – Electronics Desk Satellite Downlink or downlink of satellite circuit is a feeder link that transmits the signal from satellite down towards the ground-based station i.e., earth station.

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.