IWRL6432: 1DFFT results wrong, only the last burst seems right

Tool/software:

Hello experts:

We met up with one issue, after finished 1DFFT, we export the data, and the data is wrong, no target is detected(there is a corner reflector before the radar), only noise except for the last burst(two chirps). Here is the configuration:

sensorStop 0

channelCfg 7 3 0

chirpComnCfg 10 5 0 512 1 56 3

chirpTimingCfg 6 40 0 40 57.2

frameCfg 2 0 324 16 3000 0

sigProcChainCfg 0 0 1 0 0 0 0 0
fftOutDivShift 2

rangeSelCfg 0.15 17.0

antGeometryCfg 1 1 1 0 0 1 1 3 1 2 0 3 2.5 2.5

adcLogging 2

lowPowerCfg 0

factoryCalibCfg 1 0 38 6 0x1ff000

We have checked, all ADC data is right, and tried Blackman window and rect window, the result is almost the same.

The demo we are using is :

C:\ti\MMWAVE_L_SDK_05_04_00_01\examples\mmw_demo\mmwave_demo\xwrL64xx-evm\m4fss0-0_freertos

We also tried to use the default configuration "parking_5m.cfg", and we could not get the expected cloud point.

Please help review what mistakes we have made.

Thanks very much!