According to key problem of real-time calculation of FFT in nuclear signal frequency spectrum analysis

the special structure feature of "0" and "1" series is used in neutron pulse signal. Neutron pulse series Fourier translation algorithm is proposed with addition and address instruction by new rotation-table. The algorithm is optimized by SSE

and a PC-based real-time frequency spectrum analysis algorithm is implemented at 1 GHz sampling rates. Numerical experiments demonstrate that the presented algorithm is about 517% faster than FFTW

and is enhanced performance about 209% by SSE at the count rate of 3×106 s-1. The algorithm meets the demand of real-time frequency spectrum analysis.