Hi,
I have two questions related to the calibration of cascaded radar (MMWCAS-RF-EVM) on page 15 of Imaging Radar Using Cascaded mmWave Sensor Reference Design.
(1) The I_interp or calibrationInterp is given as 5 in file module_param_antennaCalib.m under C:\ti\mmwave_studio_03_00_00_14\mmWaveStudio\MatlabExamples\4chip_cascade_MIMO_example\main\cascade\paramGen.
The interpolation factor (calibrationInterp) is used for range FFT for frequency calibration.
Why it is given as 5? For different chirp configurations, how to chose the value of calibrationInterp?
(2) On page 15 of Imaging Radar Using Cascaded mmWave Sensor Reference Design, exp(-jF) should multiplied with the raw ADC data for frequency calibration.
However, in file datapath.m under C:\ti\mmwave_studio_03_00_00_14\mmWaveStudio\MatlabExamples\4chip_cascade_MIMO_example\modules\calibration\@calibrationCascade, line 108 "correction_vec = (exp(1i*((0:numSamplePerChirp-1)'*freq_calib))');", the negative sign of exp(-jF) is gone. This is inconsistent with the description.
Where is the negative sign of exp(-jF) in the calibration process or which one is correct?
Thank you very much for the help!
Best,
Hang