Abstract: The power distribution and correlation characteristic of cochannel interference are quantitatively analyzed in the ship-based passive Synthetic Impulse and Aperture Radar(SIAR) scenario. The statistical characteristic of interference at the interested range bin is estimated accurately using echoes from some positive and all negative frequency range bins after stretching with consine weight. Thereafter, the Karhunen-Loeve transformation in the temporal domain is used to the echo at the interested range bin and interference is suppressed before adaptive beamforming provided that its power is stronger than radar echoes. Effectiveness of interference suppression is confirmed by real data.

Key words: cochannel interference suppression, synthetic impulse and aperture radar, covariance matrix