Analysis and design of x-band down converter for data acquisition system of satellite ground station

Abstract

Data Acquisition system of the Remote Sensing Satellite Ground Station established for Indian satellite receives data from IRS Series of satellites in X-Band frequency. Antenna, Feed and RF system receive the signals from faraway sensing satellites in X Band. In this paper the study evaluation and design of X-band twin down converter, to convert incoming RF frequency (7.9 to 8.5) GHZ to lower (S-band) frequency 2.3 to 2.9GHZ by beating with fixed 5.7GHZ VCO frequency, derived by PLL technology, is attempted. In the 2nd stage (2.3 to 2.9) GHZ frequency is translated to suitable Intermediate frequency 720MHZ, through pounding with a frequency synthesizer having the variety of 1.5 to 2.3GHZ by tuning the frequency synthesizer frequency. We can adapt all incoming frequency within the variety of 7.9 to 8.6GHz to suitable 720MHZ, Here the down conversion has got the capability of multi mission.