Baumer 11188367 Bedieningshandleiding - Pagina 13

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Baumer 11188367 Bedieningshandleiding

2.2 Targets and Measurement

2.2.1

Reference Target

All data sheet specifications are based on a low-reflectance target (a wood panel with dimen-
sions 1200mm by 1700mm). This is to simulate the low reflectance of natural objects while
avoiding distance ambiguities. The measurement with radar is an intrinsically statistical pro-
cess when measuring on ground and / or crop which are highly structured targets. Great care
has been taken to design a robust signal processing to extract ground and crop distance.
Nevertheless integration testing is essential in the application. The correlation between sensor
output and the definition of the crop distance must be determined by testing. The zero point
for the measurement is on the tip of the lens.
NOTE
The correlation between ground & canopy distance with actual targets must
be determined for every application.
2.2.2

Structured application environment targets and stationary situations

When measuring on a structured surface (such as soil) the measured distance will be aver-
aged over the whole area covered by the sensor opening angle ("directionality"). In static sit-
uations distances with a strong reflection will be favoured. When moving over the structured
object statistics will avoid these strong reflections at distinct distances and the ground distance
can be determined well. Nevertheless the structure of the surface of the soil will be reflected
in the measured distances.
The next figure shows that a multitude of strong reflections are possible within the opening
angle of the sensor (blue dots). The output distances may shift over time, due to slight changes
in position due to vibration and changed radar wave interference. Causes may be shifting of
leaves in the wind, vibration and movement of the implement, and so on. The distance values
must be filtered appropriately to avoid erratic movement of implements in these situations and
avoid unpredictable movement for bystanders.
CAUTION
The superordinate controller instance must filter the sensor signal to
avoid erratic implement movement.
R600V.DAE0_manual_1.5 (EN).docm
Last Update: 07 Jan 2021
Manual R600V.DAE0 (EN)
Page 13 of 29