Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1993-05-03
1995-06-20
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 49, 367 50, 364421, G01V 136
Patent
active
054266181
ABSTRACT:
Excellent likeness of impulse response function r.sub.o (t) of a given linear space is obtained by exciting the space through a transmitting transducer with a compressible probing signal x(t) which is a string of lowpass narrow p(t)-wavelets polarity-controlled by a single cycle of an m-sequence and processing received raw-data by cross-correlating it with a special reference s(t) which is cyclical repetition of the same m-sequence. Cross-correlating x(t) directly with s(t) yields compressed version of x(t) (denoted e(t)) which is p(t) multiplied by length of the m-sequence. e(t) equivalently excites the space to give processed output which is the likeness of r.sub.o (t). e(t) is free from side-lobes and readily made arbitrarily slim by choosing p(t) slim; keeping duration and energy of x(t) fixed, e(t) characterizes an area invariant of the slimness of e(t) or p(t). Above qualities of e(t) eliminate causes of inability to achieve high resolution and high SNR and need for increased excitation and increased power rating of transmitting transducer of conventional method which uses signal CHIRP. Cross-correlated with s(t), colored noise is minimized. Choosing width of p(t) narrower than width of the impulse response function of transmitting transducer makes feasible use of transmitting transducer of further reduced power rating. Consequently, high resolution, high SNR, deep penetration, and reduced power rating of transmitting transducer are simultaneously accomplished.
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Chen Hong-Bin
Wu Neng E.
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