Four-channel mainlobe interference suppression under amplitude-phase error

Aiming at the interference suppression problem of two-dimensional digital array radar under amplitude-phase error, a four-channel mainlobe interference suppression method is given. On the basis of the traditional three-channel monopulse angle measurement technique, a double difference channel is added, combined with the interference cancellation technique, to form sum and difference beams in azimuth and elevation, and then the channel data are subjected to distance-Doppler processing, which effectively improves the target detection capability. The angle estimation simulation using different data without adding amplitude-phase error shows that the angle estimation accuracy of RD data is higher than that of pulse compression data. The four-channel mainlobe interference suppression method is simulated and analysed, and the simulation results show that the method can achieve the suppression of mainlobe interference under the influence of amplitude-phase error, and the angle estimation accuracy is related to the size of amplitude-phase error.