Types Of Satellites And Their Uses Pdf

Satellites weigh around 2 500 kgs.

Types of satellites and their uses pdf.

Satellites can be classified based on their applications orbit in which they are placed. Satellites are mainly categorised as. The antennas are at fixed positions and use an uplink band of 1 634 5 1 660 5 mhz and downlink in the range of 1 530 1 559 mhz. The type of satellite that is launched to monitor cloud patterns for a weather station will be different than a satellite launched to send television signals across canada.

The geo satellites are at an altitude of 35 768 kms which orbit in equatorial plane with 0 degree inclination. Types of satellites based on its application are. There are different types of tether satellites including skyhooks format flying tethers momentum exchange tethers and electrodynamic tethers. In the context of spaceflight a satellite is an object that has been intentionally placed into orbit these objects are called artificial satellites to distinguish them from natural satellites such as earth s moon.

Communication satellites are of two types. Passive satellites and active satellites. Types of communication satellites. Once out in the space all the different types of satellites follow similar physics principles and are governed by the same math equations.

The communication satellites are used for spying in enemy countries i e. On 4 october 1957 the soviet union launched the world s first artificial satellite sputnik 1 since then about 8 900 satellites from more than 40 countries have been launched. Tether satellites are mainly used for altitude control stabilization propulsion maintaining relative positions of a larger spacecraft sensor system and momentum exchange. A polar satellite is a low altitude satellite orbit around the earth in north south orbit passing over the north pole and south pole.

The satellite must be designed specifically to fulfill its role. Orbits are categorized by its altitude inclination with reference to the equatorial plane eccentricity synchronization parameters planet centered pseudo orbit and others. It can be used for military purposes. They complete exactly one rotation per day.

The satellites are launched with a specific objective in mind pertaining to several uses such as communications research in scientific areas forecasting the weather and intelligence. These orbit directly above the equator with a period equal to one earth day. The orbit of the polar satellite is called polar orbit. These fly at low altitudes about 160km and are used for earth observation and surveillance.

Hence in order to transmit the information or signal over long distances a single satellite or multiple satellites are used to redirect the signals.