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MMWCAS-DSP-EVM: EVE+Dopper FFT

fei he
Prodigy 200 points
Part Number: MMWCAS-DSP-EVM
Other Parts Discussed in Thread: AWR1243

Hi, experts!

The platform we are using now is mmwcas-dsp-evm

Software version: PROCESSOR_SDK_RADAR_03_07_00_00

Background:

ChirpStartIdx = 0

ChirpEndIdx = 4

RangeDim = 256

DopplerDim = 64

We have changed the four cascades of the demo to two cascades (using our own rf board)

Test demo adoption

A: Cascade Radar (4 AWR1243) Capture + Radar Object Detect (DSP) + NetworkTx (TDA2xx Only)

Question:

After reading the original data in the code and using matlab for 1DFFT and 2DFFT, it is shown in the following figure:

After reading  eve 1DFFT result data and making 2DFFT with matlab, it is shown in the following figure:

The problem is that when applying  eve doppler FFT to the result (as shown in the figure below), it is inconsistent with the previous two results. I don't know what happened.It can help us analyze the cause and how to solve it. The analytic format of doppler FFT data refers to eve_applets_userguide. PDF AppendixD.

best regards!

  • 0
    TI__Guru 50045 points

    Hi,

    I will ask our expert on EVE FFT to comment on your question.

    Regards,

    Stanley

  • 0
    TI__Guru 56820 points

    Hi,

        I would first recommend that you try to get the above results with EVE SW FFT standalone test bench. The same is located inside apps\fft\test\src\fft_tb.c.  The experiments can be much fast here and you will have more control on whats going on as you can always refer the natural C (function name: fft_cn)code which is plain C implementation of what is happening in optimized code of EVE.

       Now coming back to your issue, can you try running Doppler FFT in 32 bit output container format, the same can be enabled by setting FFT_TI_CreateParams->outputContainerFormat to FFT_TI_CONTAINER_FORMAT_32BIT.

    Regards,

    Anshu