I have generated 16 chirps in experimental study:
and the signal was picked up by some electronic sensor, and then I have calculated the spectrum of the received signal:
Following that I have calculated the cross spectrum density between the sound emitter and receiver and did some post processing, i.e.:
x=voltage1(:,2); y1=vertgeo1(:,2); Fs=1000; window=hamming(512); noverlap=512/2 nfft=512;Fs=1000; [Pxy1,f]=cpsd(x,y1,window,noverlap,nfft,Fs);
From this code the number of the points that shows the frequency resolution, essentially the number of the point that
f contains is $1\times 256$.
I would like to know how I can increase this to $1025$ points.