机载预警雷达电磁波传播多径效应研究

机载预警雷达覆盖方位广、平台远离地面，和地面雷达相比，电磁波传输多径效应与地面雷达地面相比更为严重，空域覆盖特别是低空与自由空间差异大。本文依据电波传播的基本理论，研究了不同极化、不同高度、不同发射频率和不同地表类型时多径效应对机载预警雷达空域覆盖的影响，并基于电磁波反射、传输理论阐明了仿真结果中的变化规律，为机载预警雷达设计提供指导和依据。最后，给出了利用不同发射频率和不同极化，空域覆盖受多径效应影响的差异性，进行协同探测增强雷达探测性能的结论。

Study on the Multipath Effect of the Radio Wave Propagation About the Early Warning Radar

Because of wide coverage in azimuth and high altitude from the ground, the multipath effect of airborne radar is usually more serious than ground radar. In this paper, the effects of multipath on airborne early warning radar airspace coverage under different polarizations, different altitudes, different radio frequencies and different earth surfaces are researched by the theory of the wave propagation. Based on the simulation results, the variation laws are obtained. Finally, the differences of the radar coverages under different radio frequencies and different polarizations are presented. The result of cooperative detection shows the improved performance of radar detection.