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US4001820A
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Multiple hyperplane recognizer
Assignee: United States Department of the Navy
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Filing: 1971-08-05
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Granted: 1977-01-04
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Expires: 1991-08-05
Abstract
Abstract The hyperplane recognizer identifies a target by recognizing its radar siture and separating this signature from background clutter and the signatures of other identifiable targets. The signal is passed through a tapped delay line, with each tap being weighted. As the radar signal travels down the delay line it is scaled by the weights. The weighted signal is summed, and the summed signal is above a defined threshold if a sought target is recognized and below if not.
Inventors
- 👤 Erik Rosenbaum
- 👤 Edward G. Klimchak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:42
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/292; G01S7/41; G01S7/411; G01S7/412; G06; G06F; G06F18/00; G06F18/20; G06F18/24; G06F18/243; G06F18/24317; G06F18/245; G06F18/2451
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A multiple hyperplane radar signature recognizer, comprising: a delay line; said delay line having a series of "N" taps spaced along its electrical length; means connected to said taps for scaling the outputs of said taps and generating a signal when said scaled outputs are above a threshold value; a plurality of "and" gates connected to said scaling means; each of said "and" gates corresponds to a respective antenna polarization; means connected to said "and" gates for enabling each said "and" gate for discrete period of time; and means connected to the outputs of said "and" gates for indicating the presence of output signals in all of said "and" gates during each "and" gate's respective enabling period.
Claim 2
Dependent Claim
117 words
A multiple hyperplane radar signature recognizer, comprising: a delay line; said delay line having a series of "N" taps spaced along its electrical length; means connected to said taps for scaling the outputs of said taps and generating a signal when said scaled outputs are above a threshold value; a plurality of "and" gates connected to said scaling means; each of said "and" gates corresponds to a respective antenna polarization; means connected to said "and" gates for enabling each said "and" gate for discrete period of time; and means connected to the outputs of said "and" gates for indicating the presence of output signals in all of said "and" gates during each "and" gate's respective enabling period.
Claim 3
Dependent Claim
21 words
The multiple hyperplane recognizer of claim 1, wherein each said enabling period is time keyed to the radar pulse repetition rate.
Claim 4
Dependent Claim
25 words
The multiple hyperplane recognizer of claim 2, wherein each said "and" gate is enabled only when its respective antenna polarization is in the receiving mode.
Claim 5
Dependent Claim
74 words
The multiple hyperplane recognizer of claim 3, wherein said means for indicating the presence of output signals includes a plurality of one shot multivibrators connected to each of said "and" gates outputs for stretching the time duration of a signal appearing at an "and" gate output; and an "and" gate having inputs connected to each said multivibrator output for producing a signal indicating the presence of a radar signature corresponding to a sought item.
Claim 6
Dependent Claim
39 words
The multiple hyperplane recognizer of claim 4, wherein: said enabling means is a multiplexer connected to an input of each of said "and" gates; and said multiplexer enabling each of said "and" gates during said discrete period of time.
Claim 7
Dependent Claim
51 words
The hyperplane recognizer of claim 5, wherein: said scaling means connected to said taps includes a plurality of weighting devices and a plurality of threshold devices, each said threshold device being connected to a delay line tap through a weighting device and having an output connected to a respective "and" gate.
Claim 8
Dependent Claim
20 words
The multiple hyperplane recognizer of claim 6, wherein said weight values are determined according to the least means square algorithm.
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) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |