Calculation and verification of radar line-of-sight distance based on atmosphere exponential refraction model
JIANG Yi;DONG Xiaoxuan;WANG Mingchao;FENG Bin;MA Zeqiang;XIE Jie;Nanjing Research Institute of Electronics Technology;
In order to accurately evaluate the combat performance of radar systems, it is essential to obtain the precise line-of-sight(LOS) range of the radar station site at different altitude layers. For this purpose, a method is proposed to calculate the defilade angle by using the digital elevation map(DEM), and to calculate the target LOS range by adopting the atmospheric exponential refraction model combined with the improved ray tracing integral. In view of the fact that the current ray tracing integral is only applicable when the defilade angle is greater than 0, this integral has been extended to make it applicable in cases where the defilade angle is less than 0. Finally, the proposed method is verified by using civil aviation target detection. The measured results show that, compared with the equivalent Earth radius method commonly adopted in the industry at present, the calculation error of the LOS range by the proposed method is reduced by 36%.
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