摘要
为有效分析机载雷达湍流场产生机理以及在有因次和无因次条件下的湍流变化规律,利用快速傅里叶变换三维对称特性产生出三维零均值高斯噪声,结合Von Karman模型建立了空间三维湍流场模型,并提出了一种机载雷达湍流信号的处理算法。在三维湍流场计算机仿真中引入了湍流尺度和湍流强度参数。仿真结果表明,产生的三维湍流场能较好地符合实际情形,可以满足机载雷达对湍流目标检测的飞行仿真要求。此外,在有因次情形下的湍流变化规律与无因次情形下基本是一致的,但其波动幅度要大于无因次情形。
In order to analyze the generating mechanism of turbulent flow of airborne radar and the varia- tional laws with dimension and without dimension, the three dimensional zero mean Gaussian noises are pro- duced by using the three-dimensional symmetric characteristics of fast Fourier transform （FFT）. Combined with the Von Karman model the space three-dimensional turbulent flow model is produced and the airborne radar turbulence signal processing algorithm is presented. The turbulence scale and turbulence intensity are considered in turbulent flow simulation. The simulation results show that the three-dimensional turbulent flow is suitable for the actual situation, which can meet the actual flight real-time simulation. In addition, the variational law of turbulence with dimension is basically identical with one which is without dimension, but its amplitude of fluctation is larger than the latter.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2013年第6期1193-1198,共6页
Systems Engineering and Electronics
基金
航空科学基金(20081353009)资助课题
关键词
湍流
逆离散傅里叶变换
功率谱
风速
turbulence
inverse discrete Fourier transform
power spectrum
wind velocity
