High power microwave interference effect of radar system

Abstract

With the gradual entry of high-power microwave weapons into the battlefield, the accurate evaluation of high-power microwave interference effects has increasingly important practical significance. Firstly, a radar simulation system based on nonlinear RF front-end is established. The interference effect of high-power microwave on radar nonlinear RF front-end and pulse compression processing module is analyzed. It is concluded that whether the interference signal covers the echo signal in the time domain is the main factor of the interference. Secondly, the same-frequency interference signal with different parameters is injected into the system together with the target echo signal to calculate the target detection probability of the radar system under the disturbed state. Based on the probability evaluation criterion and the least squares method, the data is analyzed, and the mathematical model of the interference pulse repetition interval and the radar target detection probability is fitted. The results show that when the power is large enough, the pulse repetition interval of the interference signal and the target detection probability constitute a power function relationship, and the function parameters are linearly related to the interference signal pulse width. When the pulse repetition interval of the high-power microwave and the radar transmission signal reaches a certain ratio, effective interference can be achieved. Under the same duty cycle, the interference effect of the interference signal with high pulse repetition rate is obviously stronger than that of the high pulse width. The suppression of high-power microwaves can significantly reduce the radar detection performance. The model can be used to optimize the interference pulse design and the prediction and evaluation of interference effects.