능동위상배열안테나의 부엽제거기 적용 시 모노펄스 왜곡 보정

Abstract

The sidelobe canceler is used to remove the received sidelobe jamming signal on the receive antenna pattern. The sidelobe canceler does not use the main antenna but is constructed using an auxiliary antenna. The sidelobe canceler generates a sidelobe cancel beam of the auxiliary antenna using the received signal of the main and auxiliary antennas. The main beam pattern that cancels the jamming signal is generated by combining the main antenna beam and sidelobe cancel beam pattern. However, in the case of a jamming signal received near the main lobe of the main antenna, distortion occurs in the main antenna pattern by applying a sidelobe canceler. Owing to this distortion, the monopulse slope characteristic for the angle estimation of the target is also distorted. This paper proposes a simple and effective method using antenna measurement data (e.g., near-field chamber measured data) to compensate for the monopulse slope distortion that occurs when the sidelobe canceler is applied. The proposed method was verified using simulations wherein the improvement in the distorted monopulse slope characteristics was confirmed.