Self-adaptive constant false alarm detecting method used for detecting radar video signals

The invention discloses a self-adaptive constant false alarm detecting method used for detecting radar video signals, and belongs to the field of radar signal processing. According to the method, whether the video signals in estimation units are uniform or not and whether the amplitude levels of the two estimation units are consistent or not are analyzed, an overall average constant false alarm detector, an average-sorting small-choosing constant false alarm detector, an average-sorting large-choosing constant false alarm detector, a front half average constant false alarm detector and a rear half average constant false alarm detector are switched in a self-adaptive mode, and therefore the defect that a single detector cannot adapt to various environments with uniform noise, dense targets, uneven clutter regions, clutter edges and the like is overcome. The environment where a detecting unit is located can be estimated more accurately, and the detection loss can be effectively reduced.