Land Earth Stations
When we need to communicate in areas with no terrestrial network we rely on satellites and local terminals. But in the other end of this connection is the land earth stations. Land earth stations provide the interface between the Geostationary Orbit (GEO) stationary satellites, some 36.000 km out in space, and the terrestrial networks for public switched telephone networks, cellular networks and data transmission networks. The land earth stations transmit data to and receive data from the satellites.
What is a Land Earth Station
A land earth station consists of several different components that makes it possible to receive, transform and sent signals through the different networks. The main part of the Land earth stations are the 13-16 m antennas that sends and receives the satellite signal. The antennas are controlled by the RF system, that steers the antenna, amplifies the signal to the satellite and transforms the received frequencies into internal frequencies. Inside the station are located a series of modems that are responsible for transforming and packaging the incoming signal into a signal that can be transmitted through the next network. All equipment is continually monitored for correct function by a series of control systems and is replaced/restarted in case of failures.
Land Earth Stations
When the land earth station receives a signal from either the satellite or terrestrial network, it need to be transformed into understandable data and repackaged in order for it to be transmitted out through the next network. This is a job for the different software programs installed on modems in the land earth station.
Knowing the Systems
At Cobham SATCOM we develop both terminals and land earth station. This means, that when we design terminals, we have the in-house know-how of the land earth station and how they integrate into each other. It also means that we have easy access to testing our terminals in real world simulation and ensures that the terminals we release are the best on the market.
Big Stations, Big Customers
Land earth station are in nature large projects that require massive investments. Therefore, most customers in this market are governments or large corporation within the tele and communication sector.
Tracking LEO/MEO Satellites
Satellites in low and medium earth orbit (LEO/MEO) are used for various tasks and are connected to the terrestrial network via teleports similar to geostationary satellite networks (“GEOs”). However, since LEO/MEO satellites orbits are closer to Earth and constantly moving, teleports now need to be tracker stations and need to continually track the movement of the LEOs or MEOs to ensure an unbroken connection whereas land earth stations connects to a fixed GEO satellite. This also means, that they have to be able to find new satellites as they appear in the sky and connect to them, before they disconnect from satellites that are leaving their line of sight. Cobham SATCOM deliver tracker stations for e.g. weather and Low-Earth Orbiting Search and Rescue (LEOSAR) satellites and many other applications. Our extensive expertise in designing directional, gimballed antennas for the maritime sector means, that we can deliver fast and reliable tracking stations for any LEO/MEO constellations, both existing and new.