C-Band VSAT Data Communication System and RF Impairments

摘要

This paper is concerned with modelling and simulation of VSAT (very smallaperture terminal) data messaging network operating in India at Karnataka withextended C-band. VSATs in Karnataka of KPTCL use VSATS 6.875-6.9465G Hz uplinksand 4.650- 4.7215 GHz downlinks. These frequencies are dedicated to fixedservices. The Satellite is Intelsat -3A, the hub has a 7.2 m diameter antennaand uses 350W or 600W TWTA (Travelling wave Tube Amplifier). The VSAT's are 1.2m with RF power of 1W or 2W depending on their position in the uplink beam withdata rate of 64 or 128 K bit/s. The performance of the system is analysed bythe error probability called BER (Bit Error Rate) and results are derived fromEarth station to hub and hub to Earth station using satellite Transponder asthe media of communication channel. The Link budgets are developed for a singleone-way satellite link.