IWR1642: How to calculate the peakval to db scale?

the test is base on SDK2.0.0.4, ES2.0 IWR1642 OOB demo.
The configuration is listed below:

sensorStop
flushCfg
dfeDataOutputMode 1
channelCfg 15 3 0
adcCfg 2 1
adcbufCfg -1 0 0 1 0
profileCfg 0 77 429 7 57.14 0 0 70 1 256 5209 0 0 30
chirpCfg 0 0 0 0 0 0 0 1
chirpCfg 1 1 0 0 0 0 0 2
frameCfg 0 1 16 0 100 1 0
lowPower 0 1
guiMonitor -1 1 1 0 0 0 1
cfarCfg -1 0 0 8 4 4 0 5120
cfarCfg -1 1 0 4 2 3 0 5120
peakGrouping -1 1 1 1 1 255
multiObjBeamForming -1 1 0.5
clutterRemoval -1 0
calibDcRangeSig -1 0 -5 8 256
extendedMaxVelocity -1 0
bpmCfg -1 0 0 1
lvdsStreamCfg -1 0 0 0
nearFieldCfg -1 0 0 0
compRangeBiasAndRxChanPhase 0.0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
measureRangeBiasAndRxChanPhase 0 1.5 0.2
CQRxSatMonitor 0 3 5 123 0
CQSigImgMonitor 0 127 4
analogMonitor 1 1
sensorStart

Hi Nitin,

I had read this source code, and i can calculate using this equation, but it's not enough.

My questions is how to calculate the peakval in detected object list to same dB scale as "Range Profile for zero Doppler".

Thanks.



For example: as you can see in attach picture, the peakval_A from detected object list is 16110, the peakval_B from "Range Profile for zero Doppler" is 44719, The dB scale value in "Range Profile for zero Doppler" is 126.6dB

I understand you are using 10*log(peakval ) to get the dB value. But the peakval in detected object list is not match the "Range Profile for zero Doppler".

I understand that db_val in "Range Profile for zero Doppler" is calculate by

dB_value = Peak_val*1/(256*TX_antenna_number*RX_antenna_number)*20*log(2)+dspFftScaleCompAll_log

So, 44719*1/(256*2*4)*20*log10(2)-6.0206 = 125.44dB, because of the capture is not in the same time, so a small error is accepted. it matchs the value in "Range Profile for zero Doppler" figure.

But in this equation, Peak_val is generate by incoherent superposition 8(2T4R) channel value. It's different to the peakval in detected object list.

Because peakval in detected object list is pick after azimuth FFT is done, so how to convert it to same dB scale as "Range Profile for zero Doppler"

How to convert 16110 to 126.6dB??

Hi Wesley,

Do you still need support on this topic?

Regards
-Nitin