デッカ電波の長距離伝搬特性-I : 北九州チェン…I

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In the inland sea (Seto-Naikai), the authors selected the three observation sites in west-east direction to avoid the magnetic effect on skywave interference, simultaneously these observations made for 72 hours, fall 1973. Both the Decometer readings and the measurement of field strength of 85kHz were carried out continuously. Field strength data by the records of Multi-Pulse transmission obtained agreed considerably with the CCIR report #322. It was supposed that the standard deviation of field strength might be principally dependent upon the ratio skywave to groundwave. The standard deviation was proportional to the equivalent frequency (Allcock). In the range of 340km from the transmitter of interest, the standard deviation (stability) of Decometer readings were settled in several cels during sunlight. Since the range described above was in the coverage of field strength in 50dB over, the fluctuation of Decometer readings were presumably governed by the field stength. Additionally, when the signal to noise ratio reached more than 5dB, the stability of phase difference showed good results. Consequently, the stability of phase difference was determined by the both assesment field strength (S/N ratio) and skywave contamination effect, especially in the short distance such as 190km the latter effect must be taken to account meaningfully. Diurnal change of atmospherics, however, was not necessarily performed regularly by the theory.
社団法人日本航海学会の論文
1974-07-31

デッカ電波の長距離伝搬特性-I : 北九州チェン…I

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