Multiclet Corp is developing multicellular processors based on a new architecture with high performance cores and very low power consumption. The processors are intended for applications in space equipment, including satellites for GPS, GLONASS and Galileo systems. The key advantages of the multicellular processors are fault tolerance, ability to use chips with defects, and gradual degradation resistance. Research and development has been completed on two initial multicellular processor core models. Testing has confirmed the promised low energy consumption and high performance. The multicellular architecture was validated through FPGA modeling and initial processor core synthesis. Further research is needed to develop an engineering solution for a radiation-hardened fault-tolerant multicellular processor for the space market.