A method and a system for detecting and positioning an intruder within a specified volume are provided herein. The method may include the following steps: periodically scanning using a laser detection and ranging (LADAR) device directing a laser beam, within the specified volume; collecting reflections of the laser beam arriving from objects within the volume; converting the reflections to LADAR signal indicative of spatiotemporal presence of objects within the volume; applying signal processing algorithms to the LADAR signals, to determine a presence of an intruder and respective orientation parameters, based on predefined criteria; directing a camera based on the orientation parameters associated with the intruder for continuously capturing images of the intruder; and analyzing the images by a computer processor and instructing the camera to track the intruder based on the analysis, to yield real-time tracking parameters of the intruder.