Satellite Communication Overview of the Technologies & the Antenna System

Key Issues

Looking ahead of the 1990s, one could observe a very rapid expansion of the global market in satellite communication into personal communication and new mobile satellite services, such as Personal Conversation System (PCS) and Mobile Satellite Services (MSS) respectively, Low Earth Orbit (LEO) satellite systems, Global Positioning System (GPS) navigation, and new direct broadcast satellite services. LEO satellite services were introduced towards the end of the 1990s, and the growth depended on competitive factors. The conventional Fixed Satellite Services (FSS) and Maritime Mobile Satellite Services (MMSS) grew steadily but not as before.

Optical fiber cables, now forming a greater part of this conversation revolution throughout the world, severely challenged the fixed satellite services. Very high data rates, similar to High Dynamic Range (HDR) graphics, which require greater than 155Mb per second of data transfer, which required excellent signal conditioning, were being carried by the fiber optics cables.

Fiber optic cables have a better performance than satellites, having much less time delay in transmission. It was a time when satellite services needed to prove their advantage on HDR applications and networking, having more modest data rates, for example, T1=1.5Mb per second. A T-1 line consists of 24 individual channels, … Read the rest

Satellite Communication Components for Communication Satellites

The simple application of any communication satellite, no matter whether it is low earth orbital or geosynchronous, includes the transmission of facts from an originating Earth station towards the satellite concerned, which can be termed as “up-linking,” followed by re-transmission from the same info towards the designated Earth station. This re-transmission is termed “down-linking.” The downlink on the details may be to one particular unique Earth station or broadcasted over a chosen number of Earth stations, situated at a bigger region.

To perform this up-linking and down-linking, the satellite features a receiver and also a acquire antenna, a transmitter, and also a transmit antenna, just like a set of a walkie-talkie, which includes a receiver in addition to a transmitter with an antenna, even though is right here, the “receive” and “transmit” is carried out through the same antenna. Satellites will need antennas separately for their two functions of acquiring and transmit. On top of that, the satellite has electronic switches.

This can be utilized to logically switch the uplink signals, down-linking it towards the suitable Earth stations. It has an electronic black-box to ascertain the destination or destinations from the signals getting down-linked to the Earth Stations. There’s that … Read the rest