RADAC WaveGuide 5 Direction User Manual page 37

flange (as shown in Fig. 1.2).
Tilt angle
The tilt angle, or the angular deviation from the vertical at which the radar is mounted, is
measured in degrees. For the point array, it is used to tilt radars B and C away from radar
A and obtain a favourable radar-footprint-triangle. In the triangle array, all 3 radars have
a tilt angle of 0 [deg]. While for the line array, only radar A will need to have a tilt angle
applied (as explained in Chapter 1).
Max. Range
The range maximum is the maximum distance (in [m]) at which the sensor will detect the
water level. In general there is no need to modify this parameter. Yet in some situations
it is advised to set this parameter to a value lower than two times the distance from the
radar to the lowest expected water level. This is to remove any disturbing effect due to a
double reflection of the radar signal.
Min. Range
The range minimum is the minimum distance (in [m]) at which the sensor will detect the
water level. This parameter is used to avoid spurious measurements and should be set
depending on the installation location. If there are any nearby surfaces that can reflect the
radar signal, the range minimum should be set to a value higher than the distance to those
reflecting surfaces. The range minimum parameter should not be lower than 2 [m] to avoid
interference with the internal reflection in the radar antenna.
Min. Signal
The signal minimum is the lower limit for the signal power that will be considered in
water level measurements. This parameter is by default set to 25 [dB], and should only be
adjusted by an expert user.
Heave Source
With three radars available it is possible to select one of the three radars to supply its
data to the algorithm for calculating all non-directional parameters (i.e. wave height and
period). The radar that is used for measuring non directional parameters is called the
'Heave Source'.
Reflection diagram
The reflection diagram gives a snapshot of raw radar data in the frequency domain. The
reflection diagram provides a useful insight in the quality of the reflection signal that is
obtained by the radar.
After changing the sensor parameters for the three sensors by pressing the submit button,
rebooting the system is required for the changes to take effect. The reflection diagram of
each sensor should be checked to ensure that the water level measurement is within the
defined limits (More information can be found in 'Step 4.2: Check the Reflection Diagrams').
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