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AWR1642BOOST: CFAR threshold formula in mmw sensor SDK

Part Number: AWR1642BOOST

Dear Sir,

In MMWAVE SDK 1.1 User Guide

Configuration command:cfarCfg

there is a formula in the column xWR16xx

Tcli = 256 x

numVirtualAntennas x TdB
/ 6

since TdB is as log10, and Tcli is as log2, so why not use the following formula instead?

(adding instead of multiplication)

dB_nVB =  20*log10(numberVirtualBeams);
 Tcli = 256 * (dB_nVB + TdB) /6
Thanks for your answer!
EnChi Liang