A sidelobes suppression technique for spectra discontinuous HF radar signal based on spectra compensation algorithm

The discontinuous spectra frequency hopped pulse waveform (DS-FHPW) signal is employed to combat spectra congestion in radar and other radio services to evade external interference in high-frequency (HF) and ultrahigh-frequency (UHF) bands. However, the spectral discontinuity of the signal gives rise to high range sidelobes when matching the reflected echo, which is much more difficult for target detection. The technique for radar range sidelobe suppression by a spectral compensation algorithm is introduced in detail. By estimating the signal at polluted frequency bands and filling the actual received signal with the estimated signal, The discontinuities of the received signal can be diminished, thus the range sidelobes can be suppressed. Simulation results show that the range sidelobes of a DS-FHPW radar signal can be suppressed significantly by the algorithm.