Analysis Of Pulse Compression Radar Jamming Style And Effectiveness Evaluation

The jamming of two models of pulse compressed radar, Linear frequency coded radar and bi-phase coded radar, are studied in this dissertation.First, we set up the models of Linear frequency coded radar and Two phase coded radar differently, and discuss the models in some degree. Then by the method of computer simulation, the following jamming patterns are made quantitative analysis, Radio-Frequency noise jamming, continuous single tune jamming, continuous noise amplitude-modulated jamming, relayed frequency shift jamming, and the key factor which affect the quality of these jamming patterns. At the same time we studied the jamming efficient on the basis of suppression coefficient.Radio-Frequency noise jamming is an effective jamming to pulse compressed(PC) radar. It shows the best jam quality when it's bandwidth equals to the jammed signal's bandwidth and it's central frequency equals to that of the jammed radar's receiver. Bandwidth and central frequency are two key factors to it's quality.Continuous single tune jamming is an effective jamming to linear frequency-modulated radar. However it can not suppress signal output after being full of the sidelobe suppress filter of the jammed bi-phase coded radar, no matter how great the power of it may be. We modulate the amplitude of the continuous single tune jamming by noise and produce the continuous noise-modulated jamming. This kind of jamming is effective to PC radar including linear frequency-modulated radar and bi-phase coded radar. It's jam characters are similar to Radio-Frequency noise jamming.Relayed frequency shift jamming has good effect on PC radar. While being selected proper parameters, it has very small suppression coefficient. At the same time, it has deceptive effect. The key factors of the Relayed frequency shift jamming to it's quality are it's frequency shift amount and the time delay between the jamming pulse and the jammed signal.Optimal jamming is based on the complete character information of the jammed PC radar. In the case of ideal circumstance, it's suppressioncoefficient is 1 and it has the best deceptive effect of all jamming patterns. However, if the information is inadequate or the parameters of the jamming are not précis enough, the quality of the kind of jamming will decline badly.