
TARGET DETECTION
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level or at least to a level which will allow the observer
to apply smaller amounts of clutter suppression (see Sec-
tion 3.6.3).
Selection of short pulse will also reduce the radial
extent of the resolution cell (see Section 2.6.5.2). This
effect can only begin to show if the distance between the
farthest scattering element of a wavefront and the near-
est scattering element (including any associated spray) of
the next wave beyond exceeds half the transmitted pulse
length. In certain sea conditions it is possible to recognise
the line of approaching wavefronts, especially in ocean
conditions where a long swell is present ...