【摘要】 提出一种基于多目标函数优化的低空大气折射率剖面反演的改进算法。以表面波导的两段两参数线性模型对大气折射率剖面建模,对反演中的不同电磁波频率时的目标函数特性进行分析。结果显示目标函数存在多个局部极值,且不同的频率其目标函数特性明显不同。以C波段(6 GHz)和X波段(10 GHz)接收到的雷达海杂波为例,用NSGAⅡ算法进行多目标函数优化反演,并与基于单目标函数优化反演的遗传算法(geneticalgoritm,GA)进行统计分析。结果显示,多目标优化反演算法能获得具有更高的精度和稳定性的低空大气折射率。更多还原

【Abstract】 A novel improved method based on multi-objective optimization is put forward for retrieving low altitude atmospheric refractivity profiles.A two-parameter two-linear model,a kind of surface-based duct model,is used as an atmospheric refractivity profiles model.The characteristics of the objective function used in atmospheric ducts retrieval are analyzed under different electromagnetic wave frequencies.The results show that the objective function has multiple local extremum,and the characteristics are obviously different for different frequencies.Let the received radar sea clutter be from C-band and X-band(6 GHz and 10 GHz) simultaneously,an NSGAⅡ algorithm is introduced to retrieve atmospheric refractivity profiles.The retrieved results using NSGAⅡ algorithm are compared with those from genetic algorithm(GA) to further analyze the performances of the novel improved method.The results indicate that the method based on multi-objective optimization can provide higher precision and better stability of low altitude atmospheric refractivity profiles than those based on single-objective optimization.更多还原