A Discussion on the Selection of Equivalent Ground Electric Parameters and Equivalent Earth Radius in Calculation for 100kHz Ground Wave Project
Liang Zhong · 2002
E0 And tω are usually called fundamental field intensity and quadric phase factor respectively in the calculation for 100kHz ground wave project. In this paper the values of E,, and tω estimated by the method 1 of the 1022 Institute and those estimated by the method of the National Time Service Center are compared respectively with the results of fundamental field intensity E0exp and quadric phase factor tωexp , which are obtained from the experiments conducted at 12 ground wave observation points. The basic procedure is as follows: The curves of Eo ~ σ (ground conductivity) and tω ~ σ are obtained by the method 1, and tωd,(F) , the values of quadric phase factor corresponding to Eoexp ,are derived from Eoexp via those curves. In the similar way the values of quadric phase factor corresponding to E1^' for the method 2, tωd(C) ,can be derived.The differences A (F) = tωexp - tωd(F) and A (C) = tωexp - tωd(C) are then estimated. The results show that A (F) and A (C) coincide with each other for 8 observation points, | A(F) | is explicitly greater than |△(C) | for 2 observation points, | △ (F) | is more than 3 times greater than | △ (C) | for one observation point, and tωexp is almost equal to tωd(C) while tωd(F) can not be determined for one observation point. It seems that the method2is better than the method1in the calculation of 100kHz ground wave project for the practical condition of the continent of China.