Interference signal detection and suppression method suitable for azimuth multichannel SAR (Synthetic Aperture Radar) system

The invention provides an interference signal detection and suppression method and system for an SAR (Synthetic Aperture Radar) system. Comprising the following steps: (1) carrying out range Fourier transform on original data; (2) selecting two receiving channels which are farthest away from each other as interference detection channels; (3) calculating a coherence coefficient interference detection threshold; (4) calculating a coherence coefficient along an azimuth sample by using an interference detection channel to realize time-stationary narrow-band interference; (5) calculating a coherence coefficient along a distance direction sample by using an interference detection channel to realize time-varying broadband interference detection; and (6) fusing the interference mask and outputting an interference detection result. The method solves the problem of interference detection of an azimuth multichannel high-resolution broadband system, and has an important supporting effect on imaging processing of a low-fr