系统工程与电子技术

• 传感器与信号处理 • 上一篇    下一篇

机载气象雷达的三维湍流模型和探测仿真方法

于莹洁, 李勇   

  1. 西北工业大学电子信息学院, 陕西 西安 710072
  • 出版日期:2016-01-30 发布日期:2010-01-03

Method for detecting and simulating 3D turbulence field of airborne weather radar

YU Ying-jie, LI Yong   

  1. School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, China
  • Online:2016-01-30 Published:2010-01-03

摘要:

对湍流等复杂气象目标的探测仿真是研究复杂气象目标的有效方法,为了提高机载气象雷达对湍流目标的探测仿真系统的精度,提出一种新的基于蒙特卡罗原理的大气湍流三维建模方法。基于相关函数矩阵生成了Von Karman湍流模型,将该模型应用到机载气象雷达湍流目标检测系统中,通过该数学模型生成湍流的雷达回波模型,对湍流目标的多普勒速度和谱宽进行估计和分析。仿真结果表明,该模型可以满足机载气象雷达湍流目标仿真时对湍流风场数值的要求,通过理论分析与仿真数值的相关性检验对比,证明所提仿真模型符合理论模型特征且具有较高的仿真精度,满足大气湍流的统计特性。通过与Dryden模型在湍流探测仿真结果进行对比,所提模型更接近于真实风场特点。

Abstract:

Simulation of detecting turbulence is an efficient way to study complex meteorological targets. In order to improve the simulation fidelity of airborne weather radar turbulence detection, a method of three-dimensional atmospheric turbulence modeling is proposed. It is the Von Karman model based on the correlation function using the Monte Carlo method. The model is applied to the airborne weather radar turbulence detection system, the turbulence echo model is generated and detected, and the obtained Doppler velocity and spectrum width of the turbulence target is analyzed. Simulation results show that the turbulence model meets the requirements of airborne weather radar turbulence wind field numerical simulation. Compared with the theory correlation test, the proposed method corresponds to theoretical model characteristics and has higher simulation accuracy, and fits the statistical characteristics of atmospheric turbulence.