Discussion on prediction of ground-wave at 100kHz

Details Discussion on prediction of ground-wave at 100kHz Discussion on prediction of ground-wave at 100kHz

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jtf....26...18c&link_type=abstract

Journal of Time and Frequency (ISSN 1001-1544), Vol. 26, No. 1, p. 18 - 24 (2003)

Computer Science

Ground Electrical Characteristics, Ground-Wave Attenuation Field Strength, Second Phase Factor

Scientific paper

The electrical characteristics of the earth surface are very important for radio time service and navigation, and the equivalent ground electrical characteristics can be estimated by the ground-wave attenuation method. For 100kHz ground-wave propagation the field strength attenuation and second phase factor, which vary with ground electrical characteristics, atmospheric radio refractive index and propagation distance between transmitting and receiving antennas, can be calculated by several different methods. The results and adopted parameters for different calculation methods are compared and discussed in this paper. It is shown that for 100kHz ground-wave propagation along the uniform and smooth ground, the calculation results, which are obtained from the method proposed by the Radio Institute of China, coincide best with the Recommendation ITU-R 368-7 "Ground-wave Propagation Curves for Frequencies between 10kHz and 30MHz".

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