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AWR1642BOOST: What is parameter "numRangeBins" for the range calculation described in the mmWave demo doxygen?

Part Number: AWR1642BOOST

Hi, 

according to the mmWave demo doxygen, users could calculate the range from the range index returned from the mmWave domo by using the below formula:

range in m = range index * (speed of light(3e8) * (digOutSampleRate * 1e3) / (2 * (freqSlopeConst * (1e6/1e-6)) * numRangeBins)) - range bias

What is the parameter "numRangeBins"?

How could I find the value of of "numRangeBins"?

Thanks for your help

Edward Lee