DOA Estimation by Six-port Reflectometer Array

In this paper the method for estimation of signals' direction of arrival (DOA) directly at RF frequency without baseband conversion and without demodulation is described. We will estimate DOA by a multiple array of antennas with an array of six-port reflectometers (SPR). To estimate an angle of arrival we have applied the RF receiver with two and three antenna elements connected to two and three SPRs. To illustrate the performance of the proposed receiver, a physical radio channel is modeled without fading, so there exists the line-of-sight connection between the sources and the receivers.