Abstract: Disclosed are systems and methods to detect objects within an environment by an aerial vehicle. An aerial vehicle may detect objects within an environment based on propeller noises emitted by the aerial vehicle that are reflected back to the aerial vehicle by objects in the environment. The propeller noise may be noise that is generated during normal operation of one or more propellers. The propeller noise emitted by the propellers of the aerial vehicle propagates into the environment around the aerial vehicle and reflects off any objects within the environment. Because the noise generated by each propeller is distinguishable, sets of solutions (distance and all directions) may be computed for each propeller. The intersections of those sets of solutions is representative of the actual distance and direction of the object with respect to the aerial vehicle.

Abstract: The present invention relates to a surveillance system for detecting forbidden movement in any direction at one or more locations along a road. The system comprises cameras that are in data communication with a control station for detecting the forbidden movement; mobile platforms that are movable along a desired path along the road; mechanical connectors for connecting the cameras to the mobile platforms, that create an adjustable projection of the spatial distance between the camera and the mobile platform; and a control station for receiving and processing data from and transferring data the cameras.