大气波导对岸基警戒雷达影响研究

A Study on Duct's Influence on Coast-borne Surveillance Radar

通过分析2009年～2011年的大气波导环境数据，从理论上阐述了岸基雷达产生超视距探测的必要条件，对岸基雷达超视距探测现象进行了分类。首先，比较了两种典型的对流层内雷达波传播衰减计算方法，得出基于分阶傅里叶算法和抛物线方程法的混合模型算法更适合计算大气波导环境中雷达波能量的空间分布；然后，使用该模型计算了两类超视距现象在探测距离、测距精度、测向精度及探测效果方面的差异；最后，提出了利用雷达超视距探测的建议。

Historical datum of the atmospheric duct from the year 2009 to the year 2011 are counted and analyzed, the necessary condition of over-the-horizon detection phenomenon is theoretically discussed and classified, two kinds of typical calculation method of electromagnetic wave propagation attenuation are compared and the hybrid model algorithm based on split-step Fourier algorithm and parabolic equation methods（SSPEM） is more suitable for calculation of spatial distribution of radar wave＇s energy in the atmos- pheric duct environment. Then, over-the-horizon phenomenon＇s differences are calculated using the model to the two classes in the aspects of detection range, ranging accuracy, azimuth accuracy and detection effects. Finally, some suggestions of using the over- the-horizon detection phenomenon are put forward.