航海雷达模拟器中雨雪杂波图像的模拟仿真研究

Simulation of Precipitation Clutter Image on Navigation Radar and ARPA Simulator

雨雪杂波图像模拟的真实性在航海专业培训和评估中起着非常重要的作用。为了增强雷达雨雪杂波图像的逼真程度,依据雨雪降水量和空间分布的随机性,建立雨雪粒子二维分布模型,以天线波束宽度及有效照射深度为参数,考虑雨雪粒子分布及量程调整,建立雨雪区域的自适应网格模型。考虑雨雪对雷达回波的衰减作用,修正了网格内雨雪杂波合振幅的计算公式,并根据计算结果对网格内的杂波点进行亮度分级,得到雨雪区域所有像素点的亮度值显示雨雪杂波,生成的雨雪杂波图像具有较好的真实性。

The simulation of precipitation clutter image plays an important role in training and estimate of mariners. On the basis of the precipitation and stochastic space distribution of rain and snow, two-dimensional distribution model of rain and snow was built to enhance the authenticity of precipitation clutter image. Adaptive mesh model of precipitation area was built by using radar antenna＇s horizontal beam width, vertical beam width and radar clutter valid illuminate depth as parameters and considering stochastic space distribution of rain and snow and range adjustment. According to precipitation attenuation for radar echo, precipitation clutter power formula was corrected. On the basis of calculation results, the light level of clutter points in grid was classified to get the light level of all pixels in snow area On the basis of circumferential scanning principle, precipitation clutter image was simulated by programming. The precipitation clutter image is more vivid.