Range sidelobe suppression technique for randomly intermittent spectra radar signal

The randomly intermittent spectra (RIS) signal is a technique that is increasingly employed to combat spectrum congestion in radar and other radio services, to evade the external interferences. However, the spectra discontinuity of the signal gives rise to high range sidelobes when matching the reflected echo, which is much more difficult for target detection. So it is indispensable to investigate techniques for sidelobe suppression of the range profile when an RIS signal is utilized. In this paper, we introduce a new processing technique, based on time domain filtering, to lower the range sidelobes. A robust and effective algorithm is adopted to solve the coefficients of the filter, and the restriction on the desired response of the filter is derived. The simulation results show that the peak range sidelobe can be reduced to -27 dB from -9.5 dB while the frequency span band is 200 kHz.