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Status and trends for space-borne phased array radar

The first European SAR based on an active phased array was launched in March 2002 on board Envisat and is operational. Several SAR instruments with active array antennas are currently under development in Europe and new instrument concepts are under discussion for the next generation. How will new technologies, currently under development in the commercial and military sectors, influence radar design based on existing architectures and new concepts? This paper discusses the current technology status and identifies future trends.