End-fire array antenna is a kind of special radar antenna with beam pointing perpendicular to the normal direction of the array. Because of its low profile and directional radiation characteristics

it is especially suitable for blind compensation of airborne radar. As end-fire array is usually placed forward-looking

it inevitably faces the problem of non-stationary clutter which just likes traditional forward-look side-fire array. Based on the clutter spectrum characteristics of end-fire array airborne radar

a novel short-range non-stationary clutter compensation method for end-fire array with range ambiguity is proposed in this paper. The farthest detectable range unit is taken as the reference unit and the constraint protection condition is added to the moving target in this method

which overcomes the disadvantage of target cancellation and large computation of the traditional compensation method based on RBC (Registration-Based Compensation) principle with range ambiguity. At the same time

aiming at the problem of the target constraint mismatch

an extended compensation method based on virtual beam is proposed. The computer simulation results verify the effectiveness of the proposed method.