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K-LD2 Datasheet(PDF) 9 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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 9 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 9/20
Detection algorithm
The detection algorithm uses the following steps:
1. Scan the FFT spectrum for peaks with a magni-
tude higher than the set threshold level and with
the direction to detect set with the parameter D03.
2. Check if the peak is a valid movement with
the correct direction or if it is an interference.
3. Increase the immunity against interferences by
checking if the movement is constant (see parame-
ter Immunity D02).
4. If there is a valid detection, estimate the speed
bin and magnitude.
5. Latch all the information to the detection
register (see parameters R00, R01 & R02)
and to the digital outputs.
6. Decrease the hold time if there is no valid detection.
7. Reset the hold time if there is another
valid detection.
8. Reset the detection register and the digital outputs
if the hold time has elapsed.
You can find more advanced configurati-
on options for  the detection algorithm in
the chapters Speed limitation and ranging,
FFT filter and Adjust hold time and sensitivity.
Reaction Time
The reaction time of the sensor depends on different
settings and can be calculated with the equation below
when the FFT average feature is disabled.
With the FFT average feature enabled (see parameter
S0A) the equation changes to:
t
Reaction =· (Immunity + 1) =
· (Immunity + 1)
N
FFT
ƒ
Sample
256
ƒ
Sample
t
Reaction =· (Immunity + 1) · 2 =
· (Immunity + 1) · 2
N
FFT
ƒ
Sample
256
ƒ
Sample




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