Design, implementation and realization of on-board Base Band Processor & Switching System for advanced communication payload

The Base Band Processor and Switching System is one of the important Subsystem of GSAT-4 satellite. This paper discusses unique approach to handle multiple interrupts on system having constraint on limited external interrupts of micro-controller. The system also has to be optimized with limited resources available on board in terms of memory, power consumption and speed. This is an embedded system with program development in assembly language with careful selection of hardware and software partition of system. GSAT-4 Ka band payload with Regenerative transponder is a unique mission in the history of Indian Space Program. This Regenerative payload will lead ISRO into a new era of Advanced Communication Satellite Systems.