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超视距雷达天线辐射的信号能量传播的路径是弯曲的,即由地面斜射至电离层,经电离层反射后再折向地面。应用脉冲时延法测出的目标距离并不是目标至雷达的真实距离,而是传播路径的长度。定义这个长度为射线距离。目标至雷达的地面距离才是目标的真实距离。真实距离是根据射线距离和电离层参数换算出来的。换算的模式与工作频率、电离层等离子体频率、电离层底部高度、半厚度以及射线的仰角等参数有关,十分复杂。尤其是射线仰角值不能直接求出,给换算带
The propagation path of the signal energy of the radiation of the over-the-horizon radar antenna is curved, that is, the ground is slant to the ionosphere and is reflected by the ionosphere and then deflected to the ground. The target distance measured by the pulse delay method is not the true distance from the target to the radar but the length of the propagation path. Define this length as the ray distance. The distance from the target to the ground of the radar is the true distance of the target. True distance is based on the ray distance and ionospheric parameters converted. The mode of conversion is very complicated with parameters such as operating frequency, ionospheric plasma frequency, bottom of ionospheric height, half-thickness and elevation of radiation. In particular, the value of ray elevation can not be directly calculated, to the conversion zone