User's Manual

GLX-RSS-4 User Manual
Page 13 of 16
Shape of the monitored area
The shape of the monitored area that must be covered by the radars will mostly
affect radar arrangement and quantity required to cover the area. In some cases, it will
be possible to cover the area with single radar, in some cases more radars will be
required to cover the area. When designing radar placement and coverage area there are
few simple rules to be followed to get best results:
• Avoid mounting of the radar sensor on height below 2m
• Detection possibility for the target is better when more radars are sensing the
same area and radar detection range overlapping will increase detection
possibility.
• If possible, avoid all obstacles in the radar coverage area
• If strongly reflective (usually metal, reinforced concrete or similar) obstacle is
present in the radar field of view it will create radar shadow and detection of the
targets behind the obstacle will not be possible. To check radar shadow area
simple ray tracing method can be used.
• Vegetation and other not strongly reflective objects in the radar detection area
will reduce the return signal from target to the radar and will reduce the
detection range of the radar or/and probability for the target to be detected.
Typical light vegetation (bushes, small trees etc.) can reduce detection range for
0,75m
2
RCS target by average 10 to 50m and in extreme cases even more.
Heavy vegetation like forest can reduce detection range for 0,75m
2
RCS target
by average 10m to 75m, or more in extreme cases. Radar beam penetration ratio
to the vegetation depends also on the water content in the vegetation so it is
expected that wet vegetation will reduce penetration more than dry vegetation.
This ratio is dependent on many factors but in most cases average value of 25%
degradation of performance for wet vegetation can be used.
• It is not recommended to mount radar if more than one radar is used to cover
same area in the way that radars are on the same horizontal and vertical axis
line.
• In general, it is better to place radar as high as possible above the ground.
Special case is only when radar is mounted in the closed space or under the cover
of some kind. In this case radar, should be mounted 1m from the roof if possible.
• If radar height is above 0,65m and radar sensor is mounted with horizontally
angle of 0° the minimal detection distance will be greater than 4m which is
minimal detectable distance. For higher radar sensor mounting this distance will