Acoustic amplitude-threshold target ranging system
First Claim
1. An acoustic amplitude-threshold system for generating munition actuation signals responsive to the time of closest approach of a moving target to within a set range limit of a munition, said acoustic-amplitude threshold system comprising:
- an acoustic sensor circuit for sensing moving target sound waves and generating an amplitude function signal P in response thereto,differentiating means receiving said amplitude function signal P and developing a first derivative signal P therefrom,amplifier means having an amplification factor K for amplifying said first derivative signal P, said amplifier means providing an amplified first derivitive signal KP,differencing means differencing said amplitude function signal P and said amplified first derivative signal KP and providing a difference signal P-KP,a threshold circuit providing reference level signals L, andcomparator means comparing said difference signal P-KP and said reference level signals L and generating munition actuation signals therefrom.
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Abstract
Munition actuation signals are generated by an acoustic target ranging system that predicts the time and distance of closest approach of a moving target to a munition. The predictive capability of the system is based on the rate of change of the sound level emanating from the target compared to its absolute magnitude. The system generates munition standby, arm and fire signals by differencing the received acoustic amplitude function signal and its first derivative and subsequently comparing the difference signal with various reference level signals. The reference level signals are a function of munition effective range and target conditions. Mechanization of the system is realized by simple circuitry consisting of an acoustic signal detector and processor, a differentiating operational amplifier, a programmable gain amplifier, a reference level signal source, an adder and a comparator circuit.
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Citations
6 Claims
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1. An acoustic amplitude-threshold system for generating munition actuation signals responsive to the time of closest approach of a moving target to within a set range limit of a munition, said acoustic-amplitude threshold system comprising:
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an acoustic sensor circuit for sensing moving target sound waves and generating an amplitude function signal P in response thereto, differentiating means receiving said amplitude function signal P and developing a first derivative signal P therefrom, amplifier means having an amplification factor K for amplifying said first derivative signal P, said amplifier means providing an amplified first derivitive signal KP, differencing means differencing said amplitude function signal P and said amplified first derivative signal KP and providing a difference signal P-KP, a threshold circuit providing reference level signals L, and comparator means comparing said difference signal P-KP and said reference level signals L and generating munition actuation signals therefrom. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification