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K-LD2 Datasheet(PDF) 8 Page - RFbeam Microwave GmbH

Part No. K-LD2
Description  radar transceiver
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Maker  RFBEAM [RFbeam Microwave GmbH]
Homepage  https://www.rfbeam.ch/
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 8 page
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©
RFbeam Microwave GmbH | Schuppisstrasse 7 | CH-9016 St. Gallen | www.rfbeam.ch | K-LD2 | data sheet
09/2018 - Revision B | Page 8/20
Start up time
During start up, the sensor calculates the mean over
the number of FFT frames specified with the para-
meter start up learn. The start up time of the sensor
depends on this parameter, the sampling frequency
and the FFT size.
Threshold generation
The calculated mean during start up represents
the  noise floor of the sensor and is stored as spec-
trum average. During operation the spectrum average
is adapted continuously. The speed of this adaption is
configurable using the parameter threshold noise ad-
aption speed. This mechanism automatically adapts
interferences that are present in both planes of the FFT.
This adaptive spectrum average is used together with
the parameter minimum threshold margin to genera-
te the minimum possible threshold level. This means
that the threshold level for each bin cannot be smaller
than the spectrum average + the minimum threshold
margin setting and this is independent of the sensitivity
setting. Adapted interferences are thus automatically
filtered out in the threshold level and do not generate
a detection.
The noise floor of different sensors can vary. The
sensitivity setting is referenced to the ground line in
order to get an as constant as possible movement de-
tection over different sensors.
The threshold level is defined as an addition of the
parameter minimum threshold offset and the set sen-
sitivity setting for each bin (Further information about
the adjustment of the sensitivity setting can be found
in chapter Adjust Hold Time and Sensitivity).
t
Startup =
=
ƒ
Sample
N
FFT · NValue of S05
ƒ
Sample
256 N
Value of S05
Figure 8: Minimum threshold level and interference adaption
If the addition of the minimum threshold off-
set and the set sensitivity setting is smaller
than the minimum threshold level (defined
over the spectrum average and the parame-
ter minimum threshold margin), the threshold
is set to its minimum level.




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