A method of sea clutter suppression in a radar image wherein a radar image is obtained (step 100) and for each pixel n of a total number N pixels (step 104), the brightness is determined (at step 106). Once this has been performed in respect of all N pixels another radar image is obtained and the process is repeated, until the radar, or at least the sea clutter suppression function, is switched off, at which point the process ends (step 116). In addition (after step 106), the average brightness change is calculated (at step 118) between pairs of subsequent updates for the same pixel n and the standard deviation of this average is also calculated (at step 120). The process then determines (at step 122) if the calculated standard deviation exceeds some predetermined threshold (say ± 1 σ) and, if so, this is recorded (at step 124) such that effectively the frequency with which new normalised brightness differences between pairs exceed the predetermined standard deviation threshold. At step 128 it is determined whether or not the recorded frequency exceeds same threshold value. If so, the pixel is identified as clutter-related and substracted from the image (step 134). At the same time, both the average brightness and standard deviation values are updated (at step 130) to take into account general condition variations.
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