How to increase the resolution of the ambiguity function when I need to apply the sampling frequency (Fs) greater than 10 to the power of 6?

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I would like to obtain the time delay and Doppler shift between two received signals by using afmag = ambgfun(x,y,Fs,PRF).
where x and y are the two received signals, Fs is the sampling frequency and PRF is the pulse repetition frequency.
It works well if I apply up to 10^6 for Fs but Matlab cannot perform beyond 10^6 of Fs.
Does anyone know how I can improve the resolution of the ambiguity function such as interpolation or something when I
cannot apply Fs greater than 10^6?
Thanks you for your comments.

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