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fmcw adf4158 or adf4350 logical error how can they used?

Question asked by Analogman06 on Jun 26, 2015
Latest reply on Jun 29, 2015 by rbrennan

i read sweep function of these pll ics. But velocity is radio wave is nearly 300 000 000 m/s. pll lock time is nearly 100uS. a target at 20 meter above , radio waves go and reflect in a few nanoseconds but at this time pll frequency is constant for this how can IF frequency generate? lo-rf(reflected)=0 Hz  please look at image, triange sweep must not wait for new frequency how can these chips used in fmcw radars?