Passive method for obtaining target data from a sound source
First Claim
1. A passive method for obtaining target data from a sound source moving along a predetermined path in a nonsolid medium, comprising:
- disposing two sound-to-electrical signal transducers at a single, spatially defined, stationary measuring station which is remote from the sound source and which is in the vicinity of, and at a predetermined lateral spacing from, the predetermined path, and positioning the transducers to each respond to a respective one of two sound waves propagated from the sound source to the measuring station at respectively different propagation speeds;
producing representations of the frequency spectra of the sound waves arriving at the two transducers;
providing representations of the propagation speeds of the two sound waves;
determining, on the basis of the representations of the frequency spectra produced and the representations of the propagation speeds provided, the frequency spectrum of the sound waves emitted by the source and the component of the speed of the sound source in the direction of the station;
determining the speed of the sound source along the predetermined path;
standardizing the frequency spectrum representation on the basis of the speed of the sound source along the predetermined path; and
determining a characteristic of the sound source directly from the standardized frequency spectrum representation.
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Accused Products
Abstract
A passive method for obtaining target data from a sound source disposed in a nonsolid medium by means of a sound receiver remote from the sound source, by the steps of: providing, as the sound receiver, first and second sound-to-electrical signal transducers constituted and positioned to each respond to a respective one of two sound waves propagated from the sound source to the sound receiver at respectively different propagation speeds; and deriving, by means of an electrical signal processing system connected to receive output signals from the transducers, target data from the sound source by determining the frequencies of, or the difference in reception time between, the sound waves emitted by the source and to which the two transducers respond.
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Citations
10 Claims
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1. A passive method for obtaining target data from a sound source moving along a predetermined path in a nonsolid medium, comprising:
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disposing two sound-to-electrical signal transducers at a single, spatially defined, stationary measuring station which is remote from the sound source and which is in the vicinity of, and at a predetermined lateral spacing from, the predetermined path, and positioning the transducers to each respond to a respective one of two sound waves propagated from the sound source to the measuring station at respectively different propagation speeds; producing representations of the frequency spectra of the sound waves arriving at the two transducers; providing representations of the propagation speeds of the two sound waves; determining, on the basis of the representations of the frequency spectra produced and the representations of the propagation speeds provided, the frequency spectrum of the sound waves emitted by the source and the component of the speed of the sound source in the direction of the station; determining the speed of the sound source along the predetermined path; standardizing the frequency spectrum representation on the basis of the speed of the sound source along the predetermined path; and determining a characteristic of the sound source directly from the standardized frequency spectrum representation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification