US4386913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pseudo-random noise generated target simulator
Assignee: United States Department of the Navy
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Filing: 1981-05-26
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Granted: 1983-06-07
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Expires: 2001-05-26
Abstract
Abstract A target simulator tests the characteristics of a multi-element array without the use of large memories and long delay line storage. The simulator includes a master clock which provides the count frequency to a binary counter. The reading of the binary counter is compared in a comparator with a stored number in a sequence from a programmable readable memory (PROM). On agreement the comparator feeds an output to an appropriate member of a group of hydrophone counters. Upon receipt of the signal from the comparator the counter provides a signal to the PROM. The PROM then provides its next synchronizing binary number to the comparator. The hydrophone counter also provides a signal to the channel selector reset which resets an appropriate pseudo-random noise generator (PRNG) to produce an output of the target simulator.
Inventors
- 👤 Gerald L. Assard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:40
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/52; G01S7/52004
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
170 words
A pseudo-random noise target simulator comprising: programming means including clocking means for providing timing pulses, a binary counter connected to said clocking means and advancing one count upon receipt of each timing pulse, a programmable readable memory for storing and providing predetermined counts, comparator means connected to receive inputs from said counter and said programmable readable memory and for providing an output signal when the received inputs are identical, and hydrophone counting means for updating said programmable readable memory and reset means upon receipt of the output signal from said comparator; reset means connected to said programming means for cyclicly providing individual output signals on a plurality of outputs in response to the receipt of the independent signals from said programming means; and pseudo-random noise generating means for synthesizing an acoustic wave front as detected by a line array in response to receiving said cyclicly provided individual output signals, said pseudo-random noise generating means includes a plurality of pseudo-random noise generators that generate individual output signals forming said wave front.
Claim 2
Dependent Claim
170 words
A pseudo-random noise target simulator comprising: programming means including clocking means for providing timing pulses, a binary counter connected to said clocking means and advancing one count upon receipt of each timing pulse, a programmable readable memory for storing and providing predetermined counts, comparator means connected to receive inputs from said counter and said programmable readable memory and for providing an output signal when the received inputs are identical, and hydrophone counting means for updating said programmable readable memory and reset means upon receipt of the output signal from said comparator; reset means connected to said programming means for cyclicly providing individual output signals on a plurality of outputs in response to the receipt of the independent signals from said programming means; and pseudo-random noise generating means for synthesizing an acoustic wave front as detected by a line array in response to receiving said cyclicly provided individual output signals, said pseudo-random noise generating means includes a plurality of pseudo-random noise generators that generate individual output signals forming said wave front.
Claim 3
Dependent Claim
30 words
A pseudo-random noise target simulator according to claim 1 wherein said reset means includes a channel selector reset having a plurality of outputs that are excited from a predetermined permutation.
Claim 4
Dependent Claim
27 words
A pseudo-random noise target simulator according to claim 2 wherein said pseudo-random noise generating means further provides a simulated broadband wave front for an N element array.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |