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Tag - Communications

Geostationary Earth Orbit
  • Communications

Geostationary Earth Orbit (GEO) – theteche.com

December 24, 2021
by Santhakumar Raja
3 min read
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GEO is also called as geosynchronous (or synchronous) orbits, which has 24 hour period of revolution but are inclined with respect to equator. Orbits that are below a mean altitude of about 36,000 km have periods of revolution...

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Satellite Earth Station Block Diagram
  • Communications

Satellite Earth Station Block Diagram

December 24, 2021
by Santhakumar Raja
3 min read
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The communication is established to the satellite through earth station. The earth station can be located on the ship at the sea, or it can be located on the space craft or actually on the earth. The location of the earth station...

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Antenna Beams
  • Communications

Frequency Re-use by Dual Polarization

December 24, 2021
by Santhakumar Raja
6 min read
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We know that the satellite can receive and transmit one of the bands given in Table For each band, the uplink and downlink frequencies are separate. Frequency division multiplexing of the complete uplink and downlink range of...

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Code Division Multiple Access (CDMA)
  • Communications

Code Division Multiple Access (CDMA)

December 24, 2021
by Santhakumar Raja
2 min read
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In TDMA, the time slots are available to the ground stations with full bandwidth. In FDMA, the frequency bands are available to the ground stations with continuous time availability. By combining these two multiple access...

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SPADE frequency plan
  • Communications

Multiple Access (MA) Techniques used in Satellite Communication

December 23, 2021
by Santhakumar Raja
6 min read
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The uplink and downlink carriers of the satellite are required to be modulated by the signal to be transmitted. The modulation can be analog or digital. In the earlier satellites analog modulations were dominant and therefore...

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Transmitting and receiving ends of FDM FM system
  • Communications

Modulation Techniques for Satellite Link

December 21, 2021
by Santhakumar Raja
2 min read
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The communications satellites are used to carry telephone, television and data signals. The television and telephone signals are normally analog. The satellite earth station transmits these signals on the same link by...

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Satellite orbits
  • Communications

Orbital Aspects of Satellite Communication

December 20, 2021
by Santhakumar Raja
4 min read
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The orbits of satellite can be rotated around the earth through various paths. These paths are called orbits of the satellite. These orbits are used to cover the specific application areas. Orbits of Satellite When the satellite...

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Satellite Communication System
  • Communications

Block Diagram of Satellite Communication System

December 19, 2021
by Santhakumar Raja
3 min read
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Fig shows the block diagram of satellite communication system. The satellite consists of transmitters as well as receivers. They are also called as transponders. The satellite receives signals from earth station transmitter...

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Space Division Multiple Access SDMA
  • Communications

Space Division Multiple Access (SDMA) – theteche.com

December 18, 2021
by Santhakumar Raja
2 min read
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Principle : The narrow beam of radio waves is aimed at particular part of space. The same channel is reused over the another narrow beam aimed at another part of the space. This division of space in different directions of base...

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Block diagram of a multiple access system
  • Communications

Multiple Access (MA) Techniques – theteche.com

December 18, 2021
by Santhakumar Raja
5 min read
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Because of the development in communications and computer fields, the applications involving multiple users are also growing. For example, a cellular telephone network involve large number of mobile subscribers which communicate...

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