A fractional fourier domain approach for multiple target localization using the time-of-arrival

In this paper, a parameter estimation method for localizing multiple targets in the three-dimensional region using as few as four sensor elements is presented. It is designed based on the properties of chirp signals in fractional Fourier domains and it provides good separation to closely spaced targets. Besides that, a notable advantage of the proposed method over existing methods is its capability in detecting and localizing more targets than the number of sensors.