Research Of Technology Against Radar Active Deception Jamming Based On Waveform Diversity

With the emergence and widespread application of active deception jamming based on digital radio frequency memory(DRFM) in modern electronic warfare, electronic counter countermeasures(ECCM) are confronted with increasingly difficulties. The active deception jamming will easily form false target in the receiver due to the strong coherence with radar signal, which make the radar difficult to recognize the target, and brings huge resources consume and severe challenges along with threats. Therefore, in order to improve the anti-jamming performance and the dection ability of radar system, ECCM, which aimed at active deception jamming, has gradually become one of the most popular techniques in the research of anti-jamming all over the world.Based on waveform diversity, this dissertation focuses on suppression of typical active deception jamming, mainly includes the contributions as follows:1. The mechanism and mathematical model of three typical range deception jamming including range gate pull jamming, range false target jamming and chopping and interleaving(C&I) jamming, and also that of two typical velocity deception jamming including velocity gate pull jamming and velocity false target jamming are studied. The influence of the typical active deception jamming on radar detection is discussed by simulations analysis.2. A waveform design method against jamming based on orthogonal frequency division-linear frequency modulation(OFD-LFM) is studied, which takes advantage of the low correlation between orthogonal LFM waveforms, and decreases the autocorrelation sidelobe level by Windowing and matched filtering. The OFD-LFM waveform sets are effective to the suppression of range gate pull jamming, range false target and C&I jamming, and is able to decrease the jamming peak more than 20 dB, which efficiently improves the detection performance in electronic interference environment.3. Aiming at typical velocity deception jamming, a waveform design method against jamming based on phase-coded is studied. Phase-coded waveform sets with low level of correlation sidelobe and autocorrelation sidelobe designed by the method display effective inhibition of velocity gate pull jamming and velocity false target, and decreases the jamming peak more than 20 dB in the suppression region.4. Aiming at powerful velocity deception jamming, two waveform design methods with optimal initial phases based on stopband cyclic algorithm new(SCAN) and subspace Newton algorithm are proposed, which design initial phases of interpulse waveforms with given stopbands by using SCAN algorithm and subspace Newton algorithm, respectively. Not only for single target and false target scenario, both methods are also suitable for multi-targets and multi-false-targets, they are able to immensely suppress the power of jamming around the real targets in the powerful velocity deception jamming environment, efficiently improve signal to interference and noise ratio, meanwhile, increase the detection probability of weak target.Simulation results demonstrate the effectiveness of the waveform diversity technology against typical active deception jamming. Results show that, compared with the traditional radar which employs the fixed waveform, radar based on waveform diversity effectively improve suppression performance of active deception jamming as well as detection probability in the active deception jamming environment.