A sidelobes suppression technique for spectra discontinuous HF radar signal

Over-the-horizon high frequency (OTH-HF) radars operate in HF (high frequency) band, it is quite difficult to find a clear frequency band for radar system requirements in this band due to heavy interferences. The adoption of a discontinuous spectra waveform can mitigate the interferences influence and, as a result, it gives rise to high range sidelobes and thus a low signal dynamic range. This kind of sidelobes cannot be suppressed by traditional spectral weighting. In this paper, we introduce a new signal processing technique based on frequency extrapolation to lower the sidelobes associated with discontinuous spectra signals. Simulation results show significant range sidelobe reduction using this new algorithm.