User's Manual

Table Of Contents
NACOS Platinum
ED 3100 G 110 / 02 (2011-10)
Operating Instructions
A-1 General Information
A RADAR.fm / 10.11.11
A-16
Not only individual targets but also small spits of land aligned in the radial direction appear wider
than they really are, and radially oriented entrances appear narrower than in reality.As a result of
azimuthal distortions and/or changes in the target position, the radar centroid of a target can
change, especially at short range. In the case of a target being tracked, this can lead to a sudden
change in the displayed vector.
In addition to these undesirable azimuthal distortions, targets can also be deliberately widened with
increasing distance, so that narrow, close-range targets too can be seen clearly. This function is used in
the Enhance modes Medium and High. It ensures that the azimuthal distortion corresponds to the
radial distortion over a wide range of distances. Because the radial distortion depends on the pulse
length, the targets are displayed particularly large by the selection of Long Pulse.
Fig. A / 3 Radial and azimuthal distortions of the radar video
1.4.4 Undesirable Echo Displays and Effects
Disturbances of the radar video are caused by
- meteorological processes,
- reflections from the sea surface,
- radar signals from other transmitters,
- false echo displays,
- sectors of reduced radar visibility,
- superrefraction and subrefraction.
Two adjacent targets merge to
form one radar echo (azimuthal
distortion)
Radial distortion
Azimuthal distortion
RADAR video
Actual size of the target
Two targets behind one
another merge to form one
radar echo (radial distortion)
Width of the beam radiated
by the antenna
A spit of land is displayed wider
An entrance is
displayed narrower or
not at all
Land contour
RADAR video