Visibility calculation research on lighted visual aid to indicate temporary runway closure

To acquire the overall light intensity value of lighted visual aid to indicate temporary runway closure and the relationship between device visible distance and the air turbidity T,the virtual points were used to calculate the overall light intensity of the device. Compared with the superposition method, this method can upgrade the accuracy. Then, the relationship between the air turbidity T and the runway visual range (RVR) was built, according to the Rayleigh and Mie scattering formulas. And the point light stadia formula was corrected. The new way makes it meaningful by considering the relationship between incident wavelength and RVR. Through calculation, we know that the visible distance varies from 280 m to 370 m under the lowest operational standards,which can guide pilots to find it and fly again safely. The equation gives a calculation method to judge the visibility of lighted visual aid to indicate temporary runway closure,also it proves that the device can meet the visibility requirement theoretically. The correction of the calculation method was tested by experiments primarily.