Patent US4297724A successfully refreshed from Google Patents.
USH374H
Expired / Lapsed
US
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Optimum multiple target detection and resolution
Assignee: United States Department of the Army
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Filing: 1987-02-09
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Granted: 1987-11-03
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Expires: 2007-02-09
Abstract
Abstract A method or technique of resolving multiple energy sources from signals oined by a spatial array of sensors in which portions of two prior art techniques are combined to yield an improved hybrid technique. The method involves sampling and digitizing the output of a sensor array, forming and storing a co-variance matrix from such digitized samples, determining the eigenvectors and corresponding eigenvalues relating to said matrix, performing a directional eigenanalysis on the data of the matrix and determining the minima of the resulting curves, then using a minimum variance method to calculate from said matrix data the total power at each steering direction corresponding to each of said minima, then thresholding the calculated total powers to eliminate false alarms and yield the direction of each power source.
Inventors
- 👤 Anas Abo-Zena
- 👤 Eugene L. Church
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:43
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/74
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
223 words
In a fluid flow system which includes a conduit for conveying the fluid from a fluid delivery device which provides a variable volume fluid discharge by varying the speed of operation of the fluid delivery device, and wherein it is necessary to generate a rate of flow signal which is proportional to the volume of fluid delivered by the fluid delivery device in use, the improved method of generating said rate of flow signal comprising the steps of; (i) generating a first input signal which is proportional to the speed of the fluid delivery device, (ii) inputting the first input signal to a curve fitter which programmed with the combined fluid delivery device/conduit system characteristic curve according to the formula; C.sub.1 q.sup.2 -KS.sup.2 =0 where; C 1 is a constant (turbulent flow coefficient) q is the rate of flow in the system, K is constant =P 2 /S 2 2 where; P 2 is the maximum pressure generated by the fluid delivery device when it operates at design conditions, S is the speed of the fluid delivery device, S 2 is the speed of the fluid delivery device when operating at maximum design conditions and to thereby generate said rate of flow signal, as an output signal from said curve fitter, which is proportional to fluid flow delivered by the fluid delivery device.
Claim 2
Dependent Claim
223 words
In a fluid flow system which includes a conduit for conveying the fluid from a fluid delivery device which provides a variable volume fluid discharge by varying the speed of operation of the fluid delivery device, and wherein it is necessary to generate a rate of flow signal which is proportional to the volume of fluid delivered by the fluid delivery device in use, the improved method of generating said rate of flow signal comprising the steps of; (i) generating a first input signal which is proportional to the speed of the fluid delivery device, (ii) inputting the first input signal to a curve fitter which programmed with the combined fluid delivery device/conduit system characteristic curve according to the formula; C.sub.1 q.sup.2 -KS.sup.2 =0 where; C 1 is a constant (turbulent flow coefficient) q is the rate of flow in the system, K is constant =P 2 /S 2 2 where; P 2 is the maximum pressure generated by the fluid delivery device when it operates at design conditions, S is the speed of the fluid delivery device, S 2 is the speed of the fluid delivery device when operating at maximum design conditions and to thereby generate said rate of flow signal, as an output signal from said curve fitter, which is proportional to fluid flow delivered by the fluid delivery device.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein said fluid delivery device is a variable speed fan.
Claim 4
Dependent Claim
280 words
In a fluid flow system which includes a conduit for conveying the fluid from a fluid delivery device which provides a variable volume fluid discharge by varying the speed of operation of the fluid delivery device, and wherein it is necessary to generate a rate of flow signal which is proportional to the volume of fluid delivered by the fluid delivery device in use, the improved method of generating said rate of flow signal comprising the steps of; (i) generating a first input signal which is proportional to the speed of the fluid delivery device, (ii) generating a second signal which is proportional to the pressure in the conduit at zero flow, and (iii) inputting said first and second input signals to the first and second inputs respectively of a dual input curve fitter which is programmed with the combined fluid delivery device/conduit system characteristic curve according to the formula; C.sub.1 q.sup.2 +C.sub.3 q.sup.0 -KS.sup.2 =0 where; C 1 is a constant (turbulent flow coefficient) C 3 is a constant which is independent of flow and is equal to the pressure generated by the fluid device at zero flow. q is the rate of flow in the system, K is a constant=P 2 /S 2 2 where; P 2 is the maximum pressure generated by the fluid delivery device when it operates at design conditions, S is the speed of the fluid delivery device, S 2 is the speed of the fluid delivery device when operating at maximum design design conditions and to thereby generate said rate of flow signal, as an output signal from said curve fitter, which is proportional to fluid flow delivered by the fluid delivery device.
Claim 5
Dependent Claim
280 words
In a fluid flow system which includes a conduit for conveying the fluid from a fluid delivery device which provides a variable volume fluid discharge by varying the speed of operation of the fluid delivery device, and wherein it is necessary to generate a rate of flow signal which is proportional to the volume of fluid delivered by the fluid delivery device in use, the improved method of generating said rate of flow signal comprising the steps of; (i) generating a first input signal which is proportional to the speed of the fluid delivery device, (ii) generating a second signal which is proportional to the pressure in the conduit at zero flow, and (iii) inputting said first and second input signals to the first and second inputs respectively of a dual input curve fitter which is programmed with the combined fluid delivery device/conduit system characteristic curve according to the formula; C.sub.1 q.sup.2 +C.sub.3 q.sup.0 -KS.sup.2 =0 where; C 1 is a constant (turbulent flow coefficient) C 3 is a constant which is independent of flow and is equal to the pressure generated by the fluid device at zero flow. q is the rate of flow in the system, K is a constant=P 2 /S 2 2 where; P 2 is the maximum pressure generated by the fluid delivery device when it operates at design conditions, S is the speed of the fluid delivery device, S 2 is the speed of the fluid delivery device when operating at maximum design design conditions and to thereby generate said rate of flow signal, as an output signal from said curve fitter, which is proportional to fluid flow delivered by the fluid delivery device.
Claim 6
Dependent Claim
15 words
The method of claim 3 wherein said fluid delivery device is a variable speed fan.
Claim 7
Dependent Claim
285 words
In a fluid flow system which includes a conduit for conveying the fluid from a fluid delivery device which provides a variable fluid discharge by varying the speed of operation of the fluid delivery device, and wherein it is necessary to generate a rate of flow signal which is proportional to the volume of fluid delivered by the fluid delivery device in use, the improved method of generating said rate of flow signal comprising the steps of; (i) generating a first input signal which is proportional to the speed of the fluid delivery device, (ii) generating a second signal which is proportional to the pressure in the conduit at zero flow, and (iii) inputting said first and second input signals to the first and second inputs respectively of a dual input curve fitter which is programmed with the combined fluid delivery device/conduit system characteristic curve according to the formula; C.sub.1 q.sup.2 +C.sub.2 q.sup.1 +C.sub.3 q.sup.0 -KS.sup.2 =0 where; C 1 is a constant (turbulent flow coefficient) C 2 is a constant (laminar flow coefficient) C 3 is a constant which is independent of flow and is equal to the pressure generated by the fluid device at zero flow. q is the rate in the system, K is a constant=P 2 /S 2 2 where; P 2 is the maximum pressure generated by the fluid delivery device when it operates at design conditions, S is speed of the fluid delivery device, S 2 is the speed of the fluid delivery device when operating at maximum design conditions and to thereby generate said rate of flow signal, as an output signal from said curve fitter, which is proportional to fluid flow delivered by the fluid delivery device.
Claim 8
Dependent Claim
285 words
In a fluid flow system which includes a conduit for conveying the fluid from a fluid delivery device which provides a variable fluid discharge by varying the speed of operation of the fluid delivery device, and wherein it is necessary to generate a rate of flow signal which is proportional to the volume of fluid delivered by the fluid delivery device in use, the improved method of generating said rate of flow signal comprising the steps of; (i) generating a first input signal which is proportional to the speed of the fluid delivery device, (ii) generating a second signal which is proportional to the pressure in the conduit at zero flow, and (iii) inputting said first and second input signals to the first and second inputs respectively of a dual input curve fitter which is programmed with the combined fluid delivery device/conduit system characteristic curve according to the formula; C.sub.1 q.sup.2 +C.sub.2 q.sup.1 +C.sub.3 q.sup.0 -KS.sup.2 =0 where; C 1 is a constant (turbulent flow coefficient) C 2 is a constant (laminar flow coefficient) C 3 is a constant which is independent of flow and is equal to the pressure generated by the fluid device at zero flow. q is the rate in the system, K is a constant=P 2 /S 2 2 where; P 2 is the maximum pressure generated by the fluid delivery device when it operates at design conditions, S is speed of the fluid delivery device, S 2 is the speed of the fluid delivery device when operating at maximum design conditions and to thereby generate said rate of flow signal, as an output signal from said curve fitter, which is proportional to fluid flow delivered by the fluid delivery device.
Claim 9
Dependent Claim
15 words
The method of claim 5 wherein said fluid delivery device is a variable speed fan.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |