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K-MD2 Fiches technique(PDF) 9 Page - RFbeam Microwave GmbH |
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K-MD2 Fiches technique(HTML) 9 Page - RFbeam Microwave GmbH |
9 / 23 page © 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) |
Numéro de pièce similaire - K-MD2 |
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Description similaire - K-MD2 |
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