Beam-Space MUSIC DOA System Using Phase Shifter

This paper proposes a DOA(Direction Of Arrival) estimation system using chip sized phase shifters and a single ADC(Analogue to Digital Converter) and Rx(Receiver) module under the antenna elements[1]. The proposed system is only controlled by the phase of antenna to find the DOA of target. To obtain the low cost and portable DOA system[2] used as surveillance system in outdoor, we propose a modifed beamspace MUSIC(MUltiple Signal Classification) using a quasi-orthogonal multi-beam instead of DFT processing. The proposed multi-beam is easily obtained by changing a phase of a single element among array. We demonstrate the proposed system using 4-element microstrip array and chip sized phase shifters. The DOA experiment in anechoic chamber confirms the proposed system performance.