Sidelobe suppression for random stepped frequency signal based on interpolation and extrapolation

For random stepped frequency radar (RSF) signal, the sidelobe level of high resolution range profile will fluctuate randomly due to the effects of discontinuous frequency spectra and frequencies hopping. The discrete Fourier transform (DFT) of interpolation and extrapolation (IE) is developed by the Bayesian criteria and minimizing the cost function, which is realized by iterative process. After the IE process, the phase of loss frequencies are extrapolated and recovered, and then the sidelobe of high range resolution profile (HRRP) is suppressed effectively at the same time. Finally the simulation analysis demonstrates that the developed method has better performance of sidelobe suppression in RSF radar.