FIELD: radio engineering.
SUBSTANCE: method of active protection of an airplane against a rocket with a radio proximity fuse sent in its pursuit, consists in setting of a passive barrier to the rocket, at the same time a command for setting the barrier is generated in case at least two time intervals are equal. The first one is generated between starts of occurrence and detection of signals on a radiolocating station with frequency (N+2)Fdo and (N-2)Fdo, and the second one - signals with frequency of (B+2)Fdo and (B-2)(Fdo=2Vofo/C), where N>B+4, B≥3, C - light speed, Vi - radial speed of a target, fo - average frequency of a continuous signal with frequency modulation according to a single-sided sawtooth linearly rising law, Do and Vo - distance and speed from the condition Do/Vo=fo/Fm dim, where Fm and dfm - modulation frequency and deviation of signal frequency. At the same time distances between an antenna of a radiolocating station and a rocket are comparable with (N+2)Do+(Vi/Vo)Do, (N-2)Do+(Vi/Vo)Do, (B+2)Do+(Vi/Vo)Do, (B-2)Do+(Vi/Vo)Do. The device for active protection of an airplane comprises a transceiving antenna, a transmitter of a continuous signal, two mixers, three filters: of differential frequencies, a broadband one and a narrowband strip one, two generators of continuous frequency, an amplifier-limiter, an amplitude detector, a comparator, a pulse shaper, an analog summator, a shift register, a generator of count pulses, a reversible counter, a digital comparator, a waiting multivibrator, AND and OR elements, a switchboard, an actuating device, and also additionally a memory unit and a code converter.
EFFECT: provision of the possibility to reduce mass and dimension characteristics.
3 cl, 2 dwg
