Baumer 11228779 운영 매뉴얼 - 페이지 13

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2.2 Targets and Measurement

2.2.1

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

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)

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