The propagation in sea water of an electromagnetic field in the form of a semi-infinite wave train or a radar pulse generated by an electric dipole is investigated analytically for low frequencies. The frequency-domain formula for the downward-traveling field of a horizontal electric dipole excited by a sinusoidally modulated electric-current pulse is Fourier transformed to obtain an explicit expression for the field at any distance in the time domain. Specific application is made to a wave packet of 25.5 cycles in a time duration of 1 s. The amplitude and phase velocity of the wave packet are determined together with the amplitudes of the initial and final transients. Graphs are displayed and discussed for a range of distances; these show that the amplitude of the wave packet decays more rapidly than the amplitudes of the transients. Possible application to remote sensing in the ocean is considered.


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    Title :

    The propagation of a radar pulse in sea water


    Additional title:

    Ausbreitung von Radarimpulsen in Seewasser


    Contributors:
    King, R.W.P. (author) / Wu, T.T. (author)

    Published in:

    Journal of Applied Physics ; 73 , 4 ; 1581-1590


    Publication date :

    1993


    Size :

    10 Seiten, 4 Bilder, 7 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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