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Methods and apparatus for the generation and transmission of signals for echo location and other signalling purposes, as in geophysical exploration
Methods and apparatus for the generation and transmission of signals for echo location and other signalling purposes, as in geophysical exploration
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机译:用于回波定位和其他信令目的的信号的产生和传输的方法和装置,例如在地球物理勘探中
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摘要
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 "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 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 onterval 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 geological reflection surfaces.
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