Real-time is a very important indicator to assess performance of acoustic positioning smart fuze Analysis three factors, the DSP chip location array､location algorithm, which impact smart fuze's real-time. Compare the number of clock cycles required in the case of using TI's own library functions and C language to complete correlation algorithm and FFT algorithm. Proving that library function is efficient, good real-time, and have a very distinct advantage. Using library functions can complete generalized cross correlation algorithm in ms-class, and by comparing the time consuming of various weighting functions, provide the basis for the choice of weighting function and sampling stints.