Can we use ambgfun with a random signal ?

Hello,

I have to compare several random signals used in noise radar technology. So, I would like to compare the ambiguity functions of these signals but I don't know how to use ambgfun with a random signal. The first signal, the easiest is generated with randn(1,N) where N=131072 and Fs=1e10. But what would be the pulse repetition frequency PRF in ambgfun(x,Fs,PRF) ?

Otherwise, is there an other way to plot the ambiguity function of a random signal ?

Thank you