When we experiment on mine detection on the sea it is always found that the position of target in echo images is not fixed because of sway of ship and this reduces the veracity of detection.

This paper analyzes the factors affecting radar bearing resolution,provides digital beam model and target scattering model to simulate target echoes image.

This paper introduces the concept of the D-S evidence theory, proposes the method to assign the basic probability assignment by the dual-threshold, and the target detection of the dual-band infrared images by D-S evidence theory.