Correcting Algorithm of DFT Spectrum of Pulsed Radar Signal Based on Cubic Convolution Interpolation

In radar signal reconnaissance digital receiver based on DFT (discrete Fourier transform), because there existing fence effect, measuring frequency algorithm based on peak-searching will produce greatly error, so the correcting to DFT spectrum of pulsed radar signal is necessary. Firstly the fact of pulsed radar signal is composed of countless single sine signals is derived and the reason that peak-searching algorithm produces error is also analyzed. Then the interpolating kernel function and interpolating function of correcting algorithm of single sine signal based on cubic convolution are proposed and shape parameter is determined via simulation. On the basis of correcting algorithm of single sine signal based on cubic interpolation, a novel correcting and detecting of pulsed radar signal DFT spectrum is given at last.