LOGARITHMIC SPECTRUM TRANSMITTER WAVEFORM FOR CONTROLLED-SOURCE ELECTROMAGNETIC SURVEYING

摘要

WAVEFORMS FOR CONTROLLED SOURCE ELECTROMAGNETIC SURVEYING. THE WAVEFORMS HAVE FREQUENCY SPECTRA THAT INCLUDE THREE OR MORE FREQUENCIES SPACED AT SUBSTANTIALLY EQUAL INTERVALS ON A LOGARITHMIC FREQUENCY SCALE AND SPANNING A BANDWIDTH OF ABOUT ONE DECADE OR MORE, AT LEAST THREE OF WHICH FREQUENCIES HAVE APPROXIMATELY EQUAL CORRESPONDING AMPLITUDES.