Abstract: This article presents a practical scheme of a digital beam forming （DBF） network with real signal processing which can reduce resource consumption by 50% as compared with complex signal processing. Time-domain Hilbert transform and distributed arithmetic algorithm are adopted, which help to save multiplier resource and reduce computation. The calibration scheme of RF channels is designed to achieve the goal of consistent RF channel response. Finally, a hardware platform and software simulation system of DBF network are designed. The experimental result demonstrates that all the parameters of the beam forming network match well with the target of design, which validates the rationality and feasibility of the algorithm.

Key words: phased array antenna, digital beam forming, Hilbert transform, distributed arithmetic, antenna calibration