Kinematic properties of aircraft concealed motion trajectory in detection zone of the onboard doppler radar

Аuthors

Kirsanov A. P.

Higher School of Economics, 20, Myasnitskaya str., Moscow, 101000, Russia

e-mail: ki@hse.ru

Abstract

Onboard radars operating in pulse Doppler mode possess characteristic feature in the detection zone. This feature lies in the fact that at each point of the detection zone the aircraft has the sector of directions. Moving along these directions it, cannot be detected by the onboard Doppler radar. This sector is named as the sector of an aircraft concealed motion directions. Due to these features there are concealed trajectories, moving along which the aircraft becomes undetectable by the onboard Doppler radar, such as an aircraft airborne early warning radar (AEWR). Most of these concealed trajectories are curvilinear with variable curvature. The article is devoted to the study of the aircraft concealed movement trajectories curvature in the onboard Doppler radar detection zone. The study of the aircraft concealed movement trajectory curvature in the AEWR detection zone was carried out to evaluate the possibilities of flying over such trajectories with account for and aircraft maneuvering characteristics. The results of the study led to obtaining the equation for calculation the curvature of any concealed trajectory in any of its points. The equation allowing determine the shape and size of a region in which the movement over the concealed trajectory is impossible due to the fact that normal overload exceeds maximum aircraft operating overload. It was established that for the valid parameters of an aircraft movement and AEWR aircraft this region is located within the circle with radius not exceeding 10 km with its center coinciding the location of the AEWR aircraft. The region, where aircraft high manoeuvrability is required, presents utterly small portion of the detection zone of AEWR aircraft. Thus, the aircraft concealed movement is possible over concealed trajectory practically in the entire detection zone.

Keywords:

onboard Doppler radar detection zone, concealed trajectory, planar trajectory curvature

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