FIELD: radar location; aviation.
SUBSTANCE: invention relates to radar and can be used in radar systems having an antenna system (AS), the beam pattern (BP) of which is periodically distorted due to the effect of the blades of the rotating main rotor of a rotary-wing aircraft (AC) on the BP of the AS. Disclosed monopulse radar system mounted on an aircraft rotorcraft comprises an AS, a receiving device and a digital computing device (DCD), having a command memory (CM). Sum and difference outputs of the automated system are connected to the corresponding inputs of the receiving device, the sum and difference outputs of which are connected to the corresponding inputs of the DCD. System additionally uses a sensor external to it, which output is connected to additional input of DCD. Sensor generates pulse at certain angular position of rotor blades relative to aircraft construction axis. CM includes a sequence of commands executed by the DCD during operation of the system; the said sequence of commands implements the determination of the mutual angular position of the ESD of the AS BP and the rotor blades angular position for the target direction finding time using the target direction finding time moment measured by the system, time moments of receiving the next and previous pulses from the sensor and values of the angular position of the rotor blades at the moment of pulse generation. Sequence of commands implements resolution of determining the angular direction to the target if the angular position of the ESD of the AS BP of the aircraft carrier differs from the angular position of each rotor blade at the moment of determining the angular direction to the object by a value not less than a given value.
EFFECT: reduction to acceptable values of direction-finding error associated with periodic distortion of the BP of the AS in the range of azimuthal directions of equal-signal direction (ESD) of the antenna BP from 0° up to 360°.
1 cl, 3 dwg
