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Radar FFT processing

02-21-2018
03:27 AM

588 Views

olivierdoare

NXP Employee

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What is the number of points used to perform the range_FFT the doppler_FFT and the reason why you need this number of points

regards,

Olivier

1 Reply

02-23-2018
01:51 AM

141 Views

iulianbulancea

NXP Employee

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Hi Olivier,

In the example shown Accelerate the Discrete Fourier Transform with NXP SPT the number of points used for Range FFT is M=512 and for Doppler FFT is N=256, which means that one frame has N=256 chirps, and each chirp has M=512 samples.

In order to perform the FFT algorithm, the number of points (M and N) must be a power of 2. In general, the larger number the better the resolution.

Regards,

Iulian