Global space agencies uses satellite programme to cover wide variety of areas and caters to the needs of various applications such as communication, navigation, earth observation etc. In the application of earth observation, satellites are placed in Low Earth Orbit(LEO) in order to gather high resolution data about the earth. But the visibility time of LEO satellites is in the order of minutes which are not sufficient to transmit high resolution data from LEO satellite to ground station antennas. As Geostationary Earth Orbit(GEO) satellite has high visibility time, therefore the inter satellite communication link is necessary between LEO and GEO satellites so that high resolution data gathered by LEO satellite is transferred to GEO satellite which in turn transmitted to the ground stations effectively.............
Keywords: Inter satellite communication link, Error Vector Magnitude, GEO, QPSK, 8-PSK, 16-QAM, Doppler effect.
Keywords: Inter satellite communication link, Error Vector Magnitude, GEO, QPSK, 8-PSK, 16-QAM, Doppler effect.