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K-MD2 Folha de dados(PDF) 9 Page - RFbeam Microwave GmbH

Nome de Peças. K-MD2
descrição  Engineering Sample
Download  23 Pages
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Fbricantes  RFBEAM [RFbeam Microwave GmbH]
Página de início  https://www.rfbeam.ch/
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K-MD2 Folha de dados(HTML) 9 Page - RFbeam Microwave GmbH

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©
RFbeam Microwave GmbH | Schuppisstrasse 7 | CH-9016 St. Gallen | www.rfbeam.ch | K-MD2 Engineering Sample | data sheet
07/2018 – Revision A | Page 9/23
Target Detection
With a set of parameters the number of raw targets
can be influenced. It can be decided how a peak over
threshold is reported. Usually an object results not
only as one peak in the range-doppler map but rather
as some peaks side by side.
Background Update (PSBU)
The running moving average is maintained for the
mean range-doppler map, which provides an expo-
nential moving average (EMA) against which each
measurement is compared. The coefficient for the
exponential decay is set using the PSBU command.
When debugging the performance, it is useful to set
the ‘Background update’ to zero so that no clut-
ter or interference is removed. It should be reset to
a typical value of 128 for normal operation. The value
sets the coefficient for the exponential moving avera-
ge against which new signals are compared. Higher
values cause the average to update more slowly so
that new signals are reported for longer.
Figure 9: Background update = 0 on the left and background update = 128 on the right
The following formula shows how the exponential
moving average filter is built:
S(t) = a . Y(t) + (1– a) . S(t – 1)
S(t) = Value of the EMA at any time period t
Y(t) = Value at a time period t
a
= 1/(background update)


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