CCS/EVM430-FR6043: algorithm problem

Hi Guangyu,

I have reached out to an expert to get more insight on this. I will have an update soon.

Thanks,

Mitch

Mitch,

Looking forward to your reply soon.

Jason

Hi Jason,

We suggest to have about 3 - 10 samples for each tone. Can you try reducing your sampling rate by at least 2x and seeing if that helps?

Thanks,

Mitch

Hi Mitch,

Thanks, that helps.

However lower sampling rate brings unexpected change on delta ToF.

Figures is shown below.

Lower sampling rate increases the uncertainty of delta ToF. The absolute value of dToF's  fiducial value increaes (-4ns to 22ns), what's more, the variation rage of dToF grows by a factor of 5 (0.8ns to 4 ns).

Is there another way to avoid zero dToF?

Thanks,

Jason

Hi Mitch,

I found a new problem.

I set up the parameters so the dToF returns zero. In this case,  I used a electric fan to blow the runner. The results of dToF returns 250ns, 500ns, 750ns, 1000ns, 1250ns. It's exactly the same as sampling gap in time, which is 1/4M. 

And I change the sampling rate to 8M, the results of dToF is 875ns, also 7 times of  125ns, the samping gap in time.

So in my opinion, the interpolation in computation of dToF doesn't work in this situation,

How does it happen?

Bset regards,

Jason