US5129595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focal plane array seeker for projectiles
Assignee: Northrop Grumman Innovation Systems LLC
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Filing: 1991-07-03
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Granted: 1992-07-14
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Expires: 2011-07-03
Abstract
Abstract The invention provides a relatively low cost, high resolution precision target acquisition and tracking system capable of operation on nonspinning ballistic munition projectiles, or the like. The system includes an imaging IR sensor head which is preferably gimbal mounted and utilizes an ambient temperature operating, densely packed, two dimensional focal plane array of electromagnetic radiation infrared sensitive (IR) sensors. The array is adapted to operate in a staring mode and a small amount of thermal stabilization is provided. Signal processing electronics are included with stabilizing self-calibrating non-uniformity compensation processing capabilities. This is combined with a high speed, high resolution real-time image processing system to extract target features and which operates with a discriminating, tracking and control system which identifies, targets and initiates tracking to impact on a selected target.
Inventors
- 👤 Edwin C. Thiede
- 👤 Charles R. Seashore
- 👤 J. Allen Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:04
CPC Classifications
F; F41; F41G; F41G7/00; F41G7/20; F41G7/22; F41G7/2213; F41G7/2253; F41G7/2273; F41G7/2293; H; H04; H04N; H04N23/00; H04N23/20; H04N25/00; H04N25/60; H04N25/67; H04N25/671; H04N25/673; H04N25/68; H04N25/69
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
200 words
An infrared (IR) sensitive seeker system for gimballed or non-gimballed mounting on a ballistic projectile capable of withstanding relatively high g forces and operating in a staring mode, the seeker system comprising: an imaging IR sensor system having a two-dimensional focal plane array (FPA) of ambient temperature operable IR sensors, wherein each sensor in the array has a baseline output is adapted to receive radiation and produce a temperature related analog output therefrom, the system including digitizing means for digitizing the analog output and which collectively produces an output in the form of a digital stream of data; optical system to cause incoming IR to be focused on the FPA: signal amplification and analog to digital conversion means to initially process the output from the sensors; high speed, high resolution real-time imaging system to produce sequential real-time high resolution frames based on the sequential output of the two dimensional array; high speed, high resolution real-time image processing means to extract target features; and control and discrimination means to utilize high resolution target feature image data to control the sensor and image framing and identify targets of interest and cause the ballistic projectile to track and approach identified targets of interest.
Claim 2
Dependent Claim
200 words
An infrared (IR) sensitive seeker system for gimballed or non-gimballed mounting on a ballistic projectile capable of withstanding relatively high g forces and operating in a staring mode, the seeker system comprising: an imaging IR sensor system having a two-dimensional focal plane array (FPA) of ambient temperature operable IR sensors, wherein each sensor in the array has a baseline output is adapted to receive radiation and produce a temperature related analog output therefrom, the system including digitizing means for digitizing the analog output and which collectively produces an output in the form of a digital stream of data; optical system to cause incoming IR to be focused on the FPA: signal amplification and analog to digital conversion means to initially process the output from the sensors; high speed, high resolution real-time imaging system to produce sequential real-time high resolution frames based on the sequential output of the two dimensional array; high speed, high resolution real-time image processing means to extract target features; and control and discrimination means to utilize high resolution target feature image data to control the sensor and image framing and identify targets of interest and cause the ballistic projectile to track and approach identified targets of interest.
Claim 3
Dependent Claim
20 words
The seeker system of claim wherein the IR sensing system is further characterized by an array of microbridge bolometer sensors.
Claim 4
Dependent Claim
29 words
The seeker system of claim 1 wherein the real-time, high resolution frames are pixel images, the pixels of which are each derived from a different sensor in the array.
Claim 5
Dependent Claim
18 words
The seeker system of claim 1 further comprising means for compensating for non-uniformity in the array baseline output.
Claim 6
Dependent Claim
31 words
The seeker system of claim 2 wherein the real-time high resolution frames are pixel images, the pixels of which are each derived from a different one of the microbridge bolometer sensors.
Claim 7
Dependent Claim
37 words
The seeker system of claim 5 in which the array baseline output further includes means which provide a uniform output for all pixels derived from microbridge bolometer sensors looking at a uniform temperature source in a field-of-view.
Claim 8
Dependent Claim
19 words
The seeker system of claim 1 further comprising compensation circuitry and algorithms to adapt to an arbitrary baseline temperature.
Claim 9
Dependent Claim
22 words
The seeker system of claim 1 further comprising means for stabilizing the baseline temperature of the array to the seeker ambient temperature.
Claim 10
Dependent Claim
12 words
The seeker system of claim 1 wherein the FPA is gimbal mounted.
Claim 11
Dependent Claim
12 words
The seeker system of claim 3 wherein the FPA is gimbal mounted.
Claim 12
Dependent Claim
12 words
The seeker system of claim 6 wherein the FPA is gimbal mounted.
Claim 13
Dependent Claim
23 words
The seeker system of claim 2 further characterized by a Cassegrain optics system to focus the received radiation onto the focal plane array.
Claim 14
Dependent Claim
23 words
The seeker system of claim 6 further characterized by a Cassegrain optics system to focus the received radiation onto the focal plane array.
Claim 15
Dependent Claim
23 words
The seeker system of claim 11 further characterized by a Cassegrain optics system to focus the received radiation onto the focal plane array.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |