Near Field Phase Retrieval for UAV-based Antenna Measurements

We consider an array working in receiving mode at the frequency of 175 MHz. An Unmanned Aerial Vehicle (UAV) equipped with a continuous wave transmitter is exploited in order to perform a near eld scan. While UAV ies in the near eld of the array, voltages at each antenna element are acquired by means of digital system. The aim of this work is to retrieve the phase information. This is not trivial because the RF transmitter on the UAV is not phase-locked to the receiver on the ground. This work will enable us to perform a near eld to far eld transformation in order to compute the radiation pattern of the whole array.