METHOD FOR PROTECTION OF RADARS AGAINST ANTIRADAR MISSILES Russian patent published in 2000 - IPC

FIELD: passive methods for protection of radars against homing weapon, in particular, against antiradar missiles equipped with passive radar homing heads. SUBSTANCE: the method is based on opposite action to antiradar missiles for a self-contained and highly mobile radar (antiaircraft guided missile system) functioning in travel and in position, in the absence of interacting radars, time and means for arrangement of equipment for remote radiation measurement. According to the offered method, a decoy rocket launcher should be installed on board (chassis) of the protected radar (antiaircraft guided missile system) capable of changing the angle of take-off of decoy rocket, determining the direction to the used antiradar missile, its range and velocity, from which it is necessary to launch an unguided decoy rocket carrying a microwave signal generator to meet the approaching antiradar missile with a certain angular displacement (angle α_dis) relative to the direction to it. The parameters and level of the signal produced by the generator and propagating in the direction of the antiradar missile should correspond to the signal parameters of the protected radar. Due to the angle of displacement, the antiradar missile is led away from the point of the radar position. It occurs due to the fact that the homing head of the antiradar missile reinterprets the signal of the decoy rocket since at the moment of its launching radar radiation is stopped. In this case there is an inconsiderable probability of trapping of the antiradar missile, which does not reduce in any way the efficiency of employment of the decoy rocket, but, on the contrary, provides for premature destruction of the antiradar missile and, respectively, the safety of the radar. Otherwise, the antiradar missile continues moving, but already with a changed trajectory, which in turn results in a miss of the antiradar missile. After a launch of the decoy rocket radar radiation is switched off. It is done so as to prevent a lock-on of the radar signal by the head of the antiradar missile after a fly-by of the decoy rocket. The magnitude of leading-away of the antiradar missile from the point of the radar position and, consequently, the probability of radar protection is the higher the larger the angle of displacement and the flight time of the decoy rocket. After fly-by of the antiradar missile, in time t = D_arm/V_arm, radar radiation is switched on again. EFFECT: enhanced efficiency. 5 dwg