Re:search (2/?)
classical tracking scenario
The airplane (tracked object) is detected with one and only one measurement (detection) at each radar scan. Due to the noise, such measurement does not coincide with the real position of the aiplane, but rather is randomly scattered around it.
multi-extended-object tracking scenario
The airplanes are detected with a random number of measurements at each radar scan. The airplanes cannot be detected in some regions (occlusions) of the field of view. A part of the set of measurements (clutter) is generated by an helicopter (spurious object) or noise.