The technique challenges and realization of space-borne digital array SAR

Space-borne digital array SAR with the character of flexible digital beam forming, high precision phase and amplitude control, and flexible sub-antenna construction is the most attractive device in the modern dynamic earth environment remote sense project. The digital array SAR can easily reach the multi-mission multi-mode, both high resolution and wide swath (HRWS), and adaptive-anti-interferer requirements. In this paper, we summarize the evolution of the digital array SAR systems, and introduce the advantages of the digital array technique in the space-borne SAR system. In our work, we explored architectures and RF modular; design a digital array module (DAM). By using these digital array SAR instruments, we get the high quality images and GMTI results through the airborne fly test. These works can improve the performance of the space-borne SAR on the modern global remote sensing.