Modeling and simulation of atmospheric refractive index distribution
One of the key factors to improve the radar detection accuracy is to correct the radio wave refraction error with high precision.According to the law of atmospheric refractive index varying with height,a new method combin-ing spline interpolation and least squares was proposed to slove the problem that the current linear interpolation method of atmospheric refractive index causes a large error of radio-ray refractive index.The continuous refractive index curve was obtained by spline interpolation in the height range of 0～13 km,and the continuous refractive index curve was fitted by least square method in the height range of 9～60 km.The refractive index obtained by spline interpolation and least square fitting method was compared with the index of refraction obtained by piecewise interpolation and atmospheric refraction measured in practice.It was proved that spline interpolation had higher ac-curacy,and the least square fitting function had the advantages of simple calculation and small error.The results show that the spline interpolation and least square method can effectively improve the correction accuracy of radio wave refraction.
radio wave refraction error correctionspline interpolationleast square methodatmospheric refrac-tive index
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