Method of automatic target angle tracking by monopulse radar under conditions of interference distorting location characteristic

摘要

Method of automatic target angle tracking by sum-and-difference monopulse radar covers radiolocation sphere and specifically monopulse direction finding systems. It can be used in order to increase guidance accuracy, for example, for anti aircraft missiles and of unmanned aerial vehicles to radar targets such as: radio beacons; aerial vehicles reflecting the radio signal that illuminates them; aerial vehicles and ground-based devices radiating radio signals and jamming signals. The aim of the method consists in the assurance of reliability and stability and in the enhancement of guidance accuracy of automatic target angle tracking due to elimination of automatic tracking losses and great errors arising during the influence of the signals of orthogonal polarization or polarization close to it.;The proposed method provides full protection from polarization jamming for all types of monopulse radars.

主权项

1. A method of automatic target angle tracking by monopulse radar under conditions of interference distorting location characteristic, said method comprising at least the following steps:
the reception of the signals from the target is carried out by a monopulse antenna by using sum and difference channels and the monopulse antenna has a vertical working polarization; the difference signal amplitude and the phase difference between the signals of the sum and difference channels are measured, herewith the difference signal amplitude determines a value of an angular error signal, and the phase difference between the signals of the sum and difference channels determines a sign of the angular error signal; the monopulse antenna is orientated in the direction of the target relying on the measured values of the amplitude and the phase difference signals corresponding to an angular error value and its sign; an additional reception of signal component from the target on the polarization orthogonal or is close to orthogonal relative to the working polarization of said monopulse antenna, is performed; the amplitude values of the additional and sum signals are compared; when the amplitude value of the additional channel signal exceeds the amplitude value of the sum signal, the monopulse antenna is oriented relying on the angular error, the sign of which corresponds to the measured value of the phase difference between the sum and difference signals, the value is formed via the inverse transformation of the measured amplitude value of the difference signal.