AWR1642: CFAR Threshold scale

chianan chang

Part Number: AWR1642

I'm confuse for the formula of CFAR threshold. In the SDK user guide, there is an example, if use 8 virtual antenna and the configure file set the CFAR threshold scale value to 5000, does it mean the threshold scale in dB value is 5000*6/(256*8)=14.65 dB?

over 7 years ago

0 Anil Mani over 7 years ago

TI__Expert 4720 points

Hi Chianan,

That is correct.

The reason for this odd choice of scale is the way in which the inputs to the CFAR algorithm are populated. In the processing flow in AWR16XX OOB demo, after the 2D FFT, we compute the logarithm (base-2) of the non-coherent sum across virtual antennas. Hence the numVirtualAntennas in the equation. The logarithm function also has 8 fractional bits, hence the 256.

Regards
Anil

0 chianan chang over 7 years ago in reply to Anil Mani

Intellectual 810 points

Hi Anil

Thanks.

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AWR1642: CFAR Threshold scale