Effect Study Of HPM To SF-LFM Guidance Radar

The precision-guided weapons has changed the modes of war, and advanced the human war to a new historical stage, which has profound influence on tactics and war theory of the future war. Another kind of vigorous new weapon, the HPMW (high power microwave weapon), has been bringing serious threat to the precision-guided weapons for its great destruction to the electronic equipment. The confrontation between the two weapons will become a wonderful scene in the future war. Researching the confrontation between the two as "spear" and "shield" has important military significance and project practical value undoubtedly.Most of the reported studies focus on the destruction threshold value of HPM (high power microwave) on electronic components, circuit modules of radar system. However, few people analyze the overall performance influence of the radar system signal and information processing.In view of the above background, this article studies the damage effect of HPM to SF-LFM (stepped frequency-linear frequency modulated) pulse compression guidance radar from the perspective of systems analysis and computer simulation, and presents the test and appraisal method to this kill effect.In this paper, the mainly research work includes:Firstly, base on the SF-LFM pulse compression guidance radar system, this article has established the qualitative and quantitative relations between signal processing performance in the front end on guidance radar detection unit of this system as well as the overall performance and the noise intensity, the relevance which induced by the HPM radiation.This article has taken "soft" anti-effect of HPMW to guidance radar signal and information processing systems to equivalent to the random amplitude and phase noise in the radar receiver’s high frequency, intermediate frequency circuit, established the stochastic process model of amplitude and phase noise; proposed the digital model of noise pollution, distortion radar target signal and signal and information processing process in the HPM radiation situation; In the hypothetical case of the equivalent noise model, through digital simulation, this article has quantitatively analyzed the influence on radar detection unit signal and information processing performance indicators in ranging, detection, tracking, etc. with the intensity and correlation of amplitude and phase noise. Secondly, base on the SF-LFM pulse compression guidance radar, some measurement and evaluation methods of amplitude and phase noise in radar receiver on HPMW is advanced. According to the supposition noise stochastic process model, from the perspective of probability theory and mathematical statistics, this thesis has obtained the procedures and methods of the high intermediate frequency noise caused by the HPM radiation. Noise appraisal include estimation of average value, variance and correlation coefficient as well as hypothesis testing of overall probability density distribution function; and aim at the Lognormal distribution scope statistical model as well as the normal distribution phase statistical model, demonstrate it is right that the proposed method of measuring and testing by using the Monte Carlo experimental method.