一种二次雷达大气折射距离误差修正方法

An Atmospheric Refraction Ranging Error Correction Method for Secondary Surveillance Radar

大气折射误差是二次雷达测距误差中最主要的因素之一。针对目前还没有二次雷达在大气中的折射距离误差修正模型,根据工程中的检飞数据,提出了一种二次雷达大气折射距离误差修正方法。该方法根据二次雷达获得的C模式气压高度实时计算折射率,得到修正的雷达波速度,减小了大气折射误差,进一步减小了距离测量的误差,从而提高了测距精度。

The error of atmospheric refraction is one of the most important factors for secondary surveillance radar(SSR)ranging error.At present,there is no correction model for refraction ranging error of SSR in the atmosphere,so a correction method for the atmospheric refraction ranging error of the SSR is proposed according to the data of flight trial in the project.The refractive index of air is calculated in real time according to the barometric height obtained by the SSR mode C.The correction speed of radar waves can be obtained according to the refractive index of air to reduce the atmospheric refraction error and the ranging error,thus improving the ranging accuracy.