Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1986-08-25
1988-07-19
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 23, 181120, G01V 122, G01V 114
Patent
active
047589973
ABSTRACT:
A transmission from a hydroacoustic source, especially for underwater geophysical exploration, is generated in accordance with two binary codes (provided by two pulse trains or sequences having two levels and which provide a spectrum of harmonically related components). One of these codes has one more or one less harmonic component than the other. The transmission is provided with a frequency spectrum which extends between an upper and lower frequency limit by sweeping the pulse trains over an octave (2:1) frequency range, far shorter than the range of the spectrum, and utilizing one of the codes and then the other of the codes during the sweep. The spectrum of the transmission extends between two arbitrary frequencies which need not be harmonically related, notwithstanding that the sweep is limited to an octave in frequency range. By adjusting the rate at which the pulse train which defines the first code sweeps with respect to the rate at which the pulse train which defines the second code sweeps, the energy of the spectrum will be smooth and continuous, thereby avoiding introducing undesirable undulations in the autocorrelation function of the transmission.
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Cunningham, A. B.; "Some Alternate Vibrator Signals", 11/1/1978, Geophysics, vol. 44, #12, pp. 1901-1914.
Hardie, H. C.; "The Resonant Acoustic Pulser . . . Source", 8/83, Geophysics, vol. 48, #8, pp. 1082-1089; abst. only.
Hydroacoustics Inc.
Lukacher Martin
Moskowitz Nelson
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