Скрытное движение воздушных объектов в зоне обнаружения бортовой доплеровской радиолокационной станции по прямолинейным траекториям
An onboard radar operating in the impulse–Doppler mode has the characteristic features of the detection zone. The feature lies in the fact that at every point of the detection zone an aircraft has a sector of directions such as the onboard Doppler radar will not detect it as long as it moves in these directions. This sector is called the sector of invisible motion directions of the aircraft. Due to these features, there exist hidden trajectories such as aircraft, which are flying along such trajectories, are not detected by an onboard early warning system Doppler radar. The article is devoted to study the rectilinear trajectories stealthy aircraft movement in the detection area of the radar of the early warning system. Formulas are presented for calculating the moments of crossing the boundaries of the resection zone (blind Doppler zone) in which airborne objects are not detected by airborne Doppler radar. It has been established that any position of the aircraft regarding the early warning system radar can be the beginning of a rectilinear stealthy trajectory with the appropriate choice of direction of movement. A formula has been found to determine the duration of the stealthy movement along a rectilinear trajectory depending on the initial position of the aircraft and the direction of its movement. Areas have been constructed in the detection zone of the pulse-Doppler radar, into which the aircraft can reach, moving along rectilinear stealthy paths. Their shapes and sizes were studied depending on the position and motion parameters of the aircraft relative to the radar. Conditions have been found when it is possible to move permanently on rectilinear stealthy trajectories, and conditions of existence of rectilinear stealthy trajectories of the aircraft to the location of the onboard Doppler radar.