Noncooperative Bistatic Radar Countermeasures Based on the Joint Design of Radar Waveforms and Mismatched Filters

Abstract

Non-cooperative bistatic radars do not transmit electromagnetic waves but use emitters of other host radars as illuminators for target detection. If the non-cooperative bistatic radar and the host radar belong to the opposing camps respectively, the non-cooperative bistatic radar will be a great challenge to the host radar. To ensure the electromagnetic information security of host radars, a joint design of host radar waveforms and mismatched filters is proposed to reduce the detection performance of non-cooperative bistatic radars. For non-cooperative bistatic radars, we raise the autocorrelation function sidelobe levels of the transmitted waveform to deteriorate its detection performance. For host radars, we design a mismatched filter to improve the target detection performance of such transmitted waveforms. The simulation results show that the effects of raising and suppressing the range sidelobes in the model are both achieved. The price is additional SNR loss (about 2dB). Two types of transmission waveforms are designed including main lobe broadening waveforms and false peaks waveforms, by controlling the autocorrelation function elevated position parameter. The constant false alarm detection results show that the designed waveforms fulfill the requirements of non-cooperative bistatic radar countermeasures.