基于气象数据的南海夏季蒸发波导分析及低空补盲方法

A evaporation duct analysis and low-altitude gap filling method in summer in South China Sea based on meteorological data

利用南海夏季6~8月气象数据完成蒸发波导建模,并通过抛物方程模型对低空超视距目标的探测概率进行仿真分析。结果表明,出现蒸发波导时不一定会显著提高探测威力。其原因在于,随着蒸发波导陷获的干涉波瓣增多,蒸发波导顶部会出现陷获盲区,此时对海面目标产生威力增程而对低空目标的影响较小。本文采用多频率联合处理的方法,抑制了蒸发波导的陷获盲区,从而实现稳定的威力增程。

The evaporation duct model is built based on the meteorological data in summer in the South China Sea,and the parabolic equation model is used to simulate and analyze the detection probability of the low-altitude OTH targets.The results show that when evaporation duct occurs,the detection coverage may not be greatly improved.As the interference lobes trapped by the evaporation duct increase,a trapping blind zone shall appear on top of evaporation duct,when the extended coverage is generated for surface targets and the impact on low-altitude targets is small.The multi-frequency joint processing method is used to suppress the trapping blind zone of evaporation duct,achieving stable extended coverage.