Backscatter Bycicle/Pedestrian Sampling Frequency
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I want to use the from the backscatterPedestrian and backscatterBicyclist functions from the Phased Array System Toolbox to simulate radar targets. The radar system should operate at 77 GHz with a 1GHz bandwidth. From the Mathworks examples I found online (e.g. Matlabs FMCW and the example in the backscatterBicyclist documentation).
From my own experiece, I found that the simulation only works correctly if the sampling frequency is set larger than 2*the chirp bandwidth (or 1*chirp_bandwidth for complex signals). This of course slows the simulations down considerably.
Is there a way to speed up the computation time by using a lower sampling frequency for the signal propagation model?
I am wondering if it is possible to only sample the down-converted IF-Signal, and thus have a sampling frequency in the MHz range.
Honglei Chen on 27 Apr 2020
It seems that you are tring to simulate the radar echo. In that case, I don't think you can lift that constraint. In real applicaitons a lot of this happens in analog but to simulate the echo properly, we need to sample at the order of chirp bandwidth. Once the echo is simulated, it is possible to decimate to alleviate the burden of processing.