Methods and apparatus for the generation and transmission of...

Details Methods and apparatus for the generation and transmission of... Methods and apparatus for the generation and transmission of...

G - Physics

01

V

349/13, 349/9

G01V 1/00 (2006.01) G01V 1/04 (2006.01)

Patent

CA 1105123

ABSTRACT OF DISCLOSURE Quasi periodic pulse trains are generated and swept in repetition frequency over an octave. Spectral harmonics of the pulse trains which prevent the trains from having a constant or "flat" power spectrum over a frequency range much greater than an octave are reduced or eliminated by adjusting the shape of the pulses in the trains By means of selecting the timing of the pulses, other harmonics are reduced or preferentially augmented. The spectral energy of the signals which are generated during a transmission interval is of the type which possesses an autocorrelation function with a narrow main lobe and low side lobe levels which is especially suitable for echo location purposes such as in geophysical exploration in which seismograms are constructed by cross correlation of the signals which are transmitted with those which are received from the geological reflection surfaces.

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