Cavity axis orientation measurement device
First Claim
1. An apparatus comprising:
- a) a frequency selective signal receiver configured to receive at least one reradiated signal resulting from an interaction of an irradiating electromagnetic signal with a cavity, the irradiating electromagnetic signal including at least 3 frequency components above a cavity bore dependent cutoff frequency;
b) a signal processor configured to compute;
i) a power spectral density of the received reradiated signal, and,ii) identify frequencies of largest local amplitude in the power spectral density;
c) an analyzer configured to relate at least one identified frequency of largest local amplitude with an orientation of the cavity longitudinal axis.
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Abstract
An apparatus for measuring the orientation of the longitudinal axis of a cavity comprising a signal receiver, a signal processor and analyzer and a cavity axis orientation analyzer. The signal receiver receives a reflected signal resulting from an interaction of multi-frequency irradiating signal(s) with at least one cavity. The irradiating signal may include an electromagnetic or acoustic signal above a cavity dependent cutoff frequency with a randomized or deterministic spectral component. The signal analyzer computes a power spectral density of the reflected signal. The local maxima of the power spectral density are identified and used to determine the cavity longitudinal axis orientation. The cavity may be the bore of a weapon.
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Citations
16 Claims
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1. An apparatus comprising:
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a) a frequency selective signal receiver configured to receive at least one reradiated signal resulting from an interaction of an irradiating electromagnetic signal with a cavity, the irradiating electromagnetic signal including at least 3 frequency components above a cavity bore dependent cutoff frequency; b) a signal processor configured to compute; i) a power spectral density of the received reradiated signal, and, ii) identify frequencies of largest local amplitude in the power spectral density; c) an analyzer configured to relate at least one identified frequency of largest local amplitude with an orientation of the cavity longitudinal axis.
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2. An apparatus comprising:
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a) a signal receiver configured to receive at least one reradiated signal resulting from an interaction of at least one irradiating signal with at least one cavity; b) a signal analyzer configured to compute at least one power spectral density of at least one of the at least one reradiated signal; c) an analyzer configured to relate at least one of the frequencies of the at least one power spectral density with the orientation of the cavity axis. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification