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Volume 17 Issue 2
Mar.  1995
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Sun Hai-Ying, Li Feng, Shang Hui-Liang. Salt-and-pepper Noise Removal by Variational Method Based on Improved Adaptive Median Filter[J]. Journal of Electronics & Information Technology, 2011, 33(7): 1743-1747. doi: 10.3724/SP.J.1146.2010.01295
Citation: Xia Mingyao, Chen Zhiyu. INVESTIGATION OF ELF RADIATION GENERATED BY ARTIFICIALLY MODULATED IONOSPHERE AND ITS APPLICABILITY TO COMMUNICATION TO SUBMARINES[J]. Journal of Electronics & Information Technology, 1995, 17(2): 125-133.

INVESTIGATION OF ELF RADIATION GENERATED BY ARTIFICIALLY MODULATED IONOSPHERE AND ITS APPLICABILITY TO COMMUNICATION TO SUBMARINES

  • Received Date: 1993-08-07
  • Rev Recd Date: 1994-01-08
  • Publish Date: 1995-03-19
  • Powerful HF waves modulated by ELF signals are employed to heat the lower ionosphere and generate ELF radiations that might be applicable to communication to submarines. Numerical results show that, if the frequency and effective radiation power(ERP) of the HF waves are 5MHz and 100MW respectively, with modulation frequency 100Hz, then the attenuation rates of the Quasi-TEM propagating in the earth-ionosphere waveguide are usually less than IdB/Mm, and the magnetic field strength 1000km away from the heating location is in the order of 10-8A/m. As for communication to submarines, for a specific ELF source and a given submarine location, there exists a most favorable frequency that maximizesthe receiving signals.
  • Rowe H E. IEEE Trans. on COM, 1974, COM-22(4): 371-385.[2]Fiel Jr. E C, Kies L R, Bannister[3]P R, et al. Radio Science, 1989, 24(2): 235-246.[4]Getmantsev G G, Zuikov N A, Rapoport V O, et al. JETP Lett., 1974, 20: 101-102.[5]Barr R,Stubbe R, Rietveld M T, et al. J. of Geophysical Research, 1986, 91(A4): 4451 -4459.[6]Barr R, Stubbe P. Radio Science. 1984. 1904): 1111-1122.[7]Stubbe P, Kopka H, Rietveld M T, et al. J. of Atmo[J].and Terr. Physics.1982, 44(12):1123-1135[8][7]Rietveld M T, Mauelshagen H P, Stubbe P, et al. J of Geophysical Research, 1987, 92(A8): 8707-8722.[9]Ferraro A J, Lee H S, Allshouse R, et al. J. of[10]Atmo. and Terr. Physics. 1984, 46(10):855-865.[11]Stubbe P, Varnum W S.[12]Planet Space Sci., 1972, 20: 1221-1226.[13]Chen Zhiyu. Xia Mingyao, The VLF/EEF Antenna Built[14]Heating the Lower Ionosphere at[15]Middle Latitudes, Proc. of the Third Internatinal Symposium on[16]Antennas and EM Theory. Nanjina, China: Sept. 1993, 132-135.[17]Chen, Zhiyu Xia, Mingyao The Primary VLF/ELF Current Produced by Heating the Lower Ionosphere above China. Pro c. of International Symposium on[18]Radio Propagation. Beijing, China: Aug. 1993, 497 -500.[19]Papadopoulos K, Chang C L, Vitello P,[20]et al. Ridio Science, 1990, 25(6): 1311-1320.[21]Galejs J. Radio Science, 1971. 6(1): 41-53.[22]Tripachi V K, C hang C L. Radio Science, 1982, 17(5): 1321-1326.[23]Wait J R. Electromagnetic Waves in Stratified Media. Oxford: Pergamon Yress, 1962.300-305.[24]Yeh K C, Liu C H. Theory of Ionospheric Waves. New York: Academic Press, 1972,121.
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