CCS/IWR1443BOOST: what does the data format of mmwRadarCube which contains the Range FFT output

Hello,

1. The data path processing is explained in detail in the HTML documentation for the IWR14xx SDK demo, available in the following directory C:\ti\mmwave_sdk_01_00_00_05\packages\ti\demo\xwr14xx\mmw\docs\doxygen\html\index.html

Please refer to Data Path - 1st Dimension FFT processing section for details on the 1D FFT processing and output format.

2. The variable rangeBinSize_meter is used to store how much each FFT bin translates to in real distance in meters. Referring to the vitalSigns Lab, it is calculated in main.c in function VitalSignsDemo_parseProfileAndChirpConfig by dividing the maximum range into the FFT size (i.e. numRangeBins which is calculated as obj->numRangeBins = pow2roundup(obj->numAdcSamples)). 

In function VVitalSignsDemo_parseProfileAndChirpConfig

dataPathObj->rangeBinSize_meter = (dataPathObj->rangeMaximum)/(dataPathObj->numRangeBins);

and then this value is used to compute the actual Range Bin Indexes corresponding to the Start and End ranges specified in the configuration file:

In function VitalSignsDemo_vitalSignProcess

rangeBinStartIndex = floor(rangeStart_meter/(obj->rangeBinSize_meter)); // Range-bin index corresponding to the Starting range in meters
rangeBinEndIndex = floor(rangeEnd_meter/(obj->rangeBinSize_meter)); // Range-bin index corresponding to the Ending range in meters

Regards

-Nitin