Surface antenna for use on e.g. navy ship, has calculation device to calculate correlation coefficients between useful signals of two line portions, and to create detection signal when coefficient exceeds preset threshold

摘要

The antenna has two sub-antennas (2, 3), each with sensors (21-2M, 31-3N) to respectively form two line portions. Signal processing devices (6, 7) create useful signals by filtering noise from combined signals obtained from each portion. A calculation device (8) calculates correlation coefficients between the useful signals of the two portions, and creates a detection signal when a coefficient exceeds a preset threshold.