大气湍流的存在严重影响航空安全。美国航空无线电技术委员会新修订的机载气象雷达最低性能标准DO-220A 增加了湍流检测的规范,要求检测量需考虑飞机特性的影响。基于该标准,研究了一种基于垂直载荷因子的湍流检测方法,并进行了仿真分析。首先,量化了飞机特性的影响,并同时考虑湍流谱宽,估计得出垂直载荷因子;其次,针对湍流检测门限,利用贝叶斯准则推导得出了基于统计特性的阈值确定准则。仿真分析验证表明:设计的增强型湍流检测方法能够满足DO-220A的要求,且能更准确地评估湍流对飞行的危害,对DO-220A 提出的增强型湍流检测规范具有重要的研究意义。

Turbulence is a very hazardous weather to the flight safety. Specifications of turbulence detection for airborne weather radar have been complemented in the latest revised DO-220A by technical commission for aeronautics radio technical commission for aeronautics. The standard states that the characteristics of aircraft should be taken into account in the turbulence detection. According to these specifications, a turbulence detection method based on the vertical load factor is researched and simulated. Firstly, the impacts of the characteristics of aircraft are quantified. Based on the quantified analysis, the vertical load factor is predicted based on both radar observation and the characteristics of aircraft. Then, the threshold of turbulence detection based on statistical characteristics is obtained by applying the Bayesian criteria. Simulations results show that the designed turbulence detection method can provide more accurate turbulence hazard metrics and can also fulfill the requirements in accordance with DO-220A. And the research is of great significance for the study of enhanced turbulence detection specified in DO-220A.

TN957