RapidIO is an emerging standard for switched interconnection of processors and boards in embedded systems. In this paper, we use discrete-event simulation to evaluate and prototype RapidIO-based systems with respect to their performance in an environment targeted towards space-based radar applications. This application class makes an ideal test case for RapidIO feasibility study due to high system throughput requirements and real-time processing constraints. Our results show that a baseline RapidIO system is well suited to space-based radar, providing significant improvements over typical bus-based architectures. Our results also show that extensions to the RapidIO protocol such as cut-through routing and transmitter-controlled flow-control would provide minimal performance improvements for the applications under study.