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Communication satellite ppt.pdf

Communication satellites enable connectivity around the world by linking devices via voice, video, and broadband internet. They provide crucial communication services to ships, aircraft, and areas without terrestrial networks. Communication satellites orbit over 35,000 km above Earth's equator, completing orbits at the same rate that the Earth rotates, allowing for fixed transmission between satellites and ground stations. They receive and amplify radio signals through transponders, acting as relays to create communication channels between different locations on Earth.

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COMMUNICATION SATELLITE
INTRODUCTION ▪ Communication satellites power our insatiable appetite for data on the go and can connect people in different locations anywhere on Earth, with voice, image, video and broadband internet. ▪ Today, over 1.4 billion smartphones are in use. This equates to one in every five people on our planet accessing ‘apps’ and data on the move. If we add TV, radio and the internet, then telecommunications are as integral to our daily lives as access to fuel and water. 4/19/2022 DR. C. BEULAH JAYARANI 2
BENEFITS OF COMMUNICATION SATELLITES ▪ They link ships crossing the oceans, provide communications for aircraft, connect people in remote areas not serviced by cellular or fibre optic networks, and enable disaster response teams to keep in touch when ground- level infrastructure has collapsed. 4/19/2022 DR. C. BEULAH JAYARANI 3
COMPONENTS OF A COMMUNICATION SATELLITE . 4/19/2022 DR. C. BEULAH JAYARANI 4
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The energy source of the satellite are the solar panels and the batteries . The batteries are used as an emergency backup during eclipse. 4/19/2022 DR. C. BEULAH JAYARANI 6
The sun sensor helps to angle the solar panels in the right direction so that maximum solar energy is captured 4/19/2022 DR. C. BEULAH JAYARANI 7
A modulated signal transmitted from the earth is received by the reflector antenna and send to the transponder 4/19/2022 DR. C. BEULAH JAYARANI 8
The position , movement and health of the satellite is monitored from the control station on earth with exchange of signals of wavelength that are different from other signals transmitted 4/19/2022 DR. C. BEULAH JAYARANI 9
When the satellite accidentally displaces from its orbit due to the earth’s gravitational force and due to the presence of the moon . The Satellite can be brought into place with the help of thrusters , that uses fuel from the fuel tank 4/19/2022 DR. C. BEULAH JAYARANI 10
COMMUNICATION SATELLITE ▪ Communication satellites are found in the geostationary orbital 35 786 km from the earths equator and moves from east to west along with the earths rotation and takes 23 hours 56 minutes and 4 seconds to complete its rotation. ▪ This is why the geostationary satellite look like a fixed star in the sky and hence an antenna on Earth can be fixed to always stay pointed towards that satellite without moving. ▪ Satellites in GEO cover a large range of Earth so as few as three equally-spaced satellites can provide near global coverage 4/19/2022 DR. C. BEULAH JAYARANI 11
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WORKING OF A COMMUNICATION SATELLITE ▪ A communications satellite is an artificial satellite that relays and amplifies radio telecommunications signals through a transponder. ▪ It basically creates a communication channel between a source transmitter and a receiver at different locations on earth. ▪ Communications satellites use a wide range of radio and microwave frequencies. ▪ The high frequency radio waves used for telecommunications links travel by line of sight, they get obstructed by the curve of the earth 4/19/2022 DR. C. BEULAH JAYARANI 13
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WORKS CITED ▪ https://www.youngwonks.com/blog/What-is-Satellite-Communication-and-How-Does-It- Work ▪ https://en.wikipedia.org/wiki/Communications_satellite ▪ https://www.sciencedirect.com/topics/engineering/communication-satellites ▪ https://www.esa.int/Enabling_Support/Space_Transportation/Types_of_orbits#GEO ▪ https://www.omicsonline.org/conferences-list/types-of-satellites-and-applications ▪ https://www.nasa.gov/missions/earth/fs13grc.html ▪ https://www.aerospace-technology.com/projects/globalstar/attachment/globalstar2/ ▪ https://youtu.be/ror4P1UAv_g 4/19/2022 DR. C. BEULAH JAYARANI 15