Novel Sidelobe cancellation for Compound-Barker Combined with LFM or Polyphase Waveform

Abstract

A new technique cancels the sidelobe effect, where a novel sidelobe cancellation filter (SCF) is developed and applied for compound-Barker in combination with linear frequency modulation (LFM) or polyphase waveform. The combination increase number of wave form can be generated and length of code that increase average power that increased signal to noise ratio after comparison. The reverse filter is used to apply a new SCF method. The SCF proposal is integrated into a matched filter (MF). The modified-MF (Mod-MF) can be applied to remove sidelobes for waveform generated from compound-Barker combined with LFM or polyphase. Mathematical derivation of the general, closed form of the SCF proposal. Furthermore, this formula depends on the Barker compound length, LFM parameters and polyphase phase. The filter proposed was generated without the need for adaptive strategies or iteration methods. The Mod-MF impacted preserves the mainline ’s impulse response width and peak values. For a small radar cross section (RCS) the proposed SCF can be detected, even though it is masked by a large RCS target lobe. Finally, the proposed SCF filter in experimental open area is tested for practical work.