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IWR6843: Maximum velocity and velocity resolution calculation

user5310849
Intellectual 730 points
Part Number: IWR6843

Hi mmWave team,

I have tried decoding chirps (profileCfg and framCfg) in order to calculate range/velocity resolution/maximum. I started with IWR6843ISK mmw_pplcount_demo_default.cfg from here.

Range calculations are OK but velocity is the problem. I am using formula for maximum velocity form this document (http://www.ti.com/lit/an/swra553/swra553.pdf) and assuming T_c is idelTime + rampEndTime = 30 + 62 = 92ms. Then I get about twice maximum velocity and resolution values (47.33 vs 23.6 and 0.74 vs 0.36). Where could be a mistake?

Btw. what transmitting frequency you use when calculating wavelength and then velocity max. and resolution?

Thank you, Lukas