The report is devoted to the foundation of the method of calculation of the service zone of the MF radio beacon for transmission of differential corrections of the global navigation satellite system (GNSS) over high-latitude manysectional impedance paths in summer and winter time. Methods of calculation of the Earth’s wave field over inhomogeneous radio paths including over layered “ice-sea” structure are considered. On a base of the analysis of propagation conditions of radio waves, a new method of calculation of the service zone of the radio lines in the Arctic basin was submitted. Numerical algorithms for various models of the propagation of radio waves were developed and tested. The method consists in using the proposed set of algorithms, maps of geoelectric sections (GES) of underlying layered medium, digital relief maps, vegetation and ice cover for the calculations of Earth’s wave fields.
Results of the modeling of the propagation of LF-MF radio waves over radio path with variable surface impedance were considered. Formulas to convert the spatial dependence of ice thickness in the spatial dependence of the surface impedance at a fixed frequency of LF-MF ranges were offered. The calculation of the field magnitude was carried out using the program of calculation of field of an attenuation function W by the method of the Hufford’s integral equation. Results of calculations of surface impedance, an attenuation function and field magnitude on a frequency of 518 kHz on a 400 kilometers section of the radio path “Tiksi - North pole”.
The paper is devoted to estimation of the LF-MF high latitude communication radio lines range on surface electromagnetic waves (SEW). A surface impedance of sea areas of water in summer and winter time is considered. An example of calculations of the ground wave field over inhomogeneous impedance paths including stratified inhomogeneous structure “ice-sea” is given. It is shown that due to the emergence of SEW the Arctic radio lines range increases significantly.
Predictive map of geoelectric sections of the North China on a scale of 1 : 2 500 000, necessary for calculation of propagation of VLF-MF radiowaves, is constructed. Taking into account the layered structure of the underlying medium, this map is capable of increasing the accuracy of electromagnetic field calculations by 1.5-3 times as compared to the Morgan-Maxwell map. The methodology of the geoelectric mapping is described. The studies of electrical properties of layered media by combined radio and geophysical methods in a variety of natural and geological conditions, and the proposed method of geoelectric mapping have resulted in the construction of a new generation of maps showing the electrical properties of the underlying medium that account for the layered structure of the crust and have no analogues in the world.