基于蒙特卡洛的大到暴雨条件下毫米波引信回波特性研究

In order to improve the adaptability of millimetre-wave (MMW) fuzes to the rainfall environment, the attenuation and scattering effects of rainfall on MMW signals are investigated, a mathematical model of the echo signal of MMW FM fuze under rainfall conditions is established. The echo signal of the fuze under the conditions of heavy and storm rainfalls is simulated based on the Monte Carlo method. The simulated and measured results show that the rainfall backscattering signal exists in the form of a single peak in the low-frequency region of echo signal, while the rainfall leads to a significant increase in the bottom noise of echo signal, and the signal-to-noise ratio of millimetre-wave fuze echo signal under the conditions of heavy and storm rainfalls decreases significantly. In the measured data, the signal-to-noise ratioes of 35 GHz and 60 GHz fuzes under the conditions of heavy and storm rainfalls are decreased by 4. 5 dB and 6. 3 dB on average, respectively, compared with those under no rainfall condition, which poses a challenge to the environmental adaptability of millimetre-wave fuzes. The modelling method and research results in this paper can provide a theoretical basis for the design of millimetre-wave fuze with environmental adaptability.