Angle of arrival detection using Retrodirective RADAR

In this paper, experimental results are shown for angle of arrival extraction using an analogue Retrodirective RADAR using PLL to an accuracy of 2.5°. Angle of arrival results from the Retrodirective RADAR were extracted from the low frequency IF phase of the PLL based phase conjugator. The target position can then be determined virtually instantaneously. Therefore the system does not require any complicated DSP post processing, so is able to operate with low power and relatively simple circuitry. This system is ideally suited to real time acquisition of fast moving projectiles.