US4639774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving target indication system
Assignee: DL FRIED ASSOCIATES Inc D/B/A OPTICAL SCIENCES Co
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Filing: 1985-06-21
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Granted: 1987-01-27
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Expires: 2005-06-21
Abstract
Abstract A system comprising a scanning detector for rapidly scanning a field of view through appropriate optical means, and with a linear infrared detector array, there being electronic apparatus for converting the detector signals to digital signals and for storing such information for comparison with like information from another or many additional scans. The system further includes electronic apparatus for processing such detector signals from a first scan as well as from second or succeeding scans to determine the amount of misalignment between the frames of such scans to develop a correction signal which is applied to adjustment apparatus to correct such misalignment to insure that the frames of succeeding scans are accurately aligned with frames from previous scans.
Inventors
- 👤 David L. Fried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:07
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/58; H04N3/00; H04N3/02; H04N3/08; H04N3/09
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
93 words
In a moving target indication system wherein a field of view is repeatedly scanned with detection means, the combination of, means for developing and storing information of said field of view from a first scan, means for developing later information of said field of view from a succeeding scan, means for comparing said later information with said stored information from said first scan, and to indicate any difference therebetween, and means for effecting adjustment of said later information to compensate for any misalignment of said succeeding scan as compared to said first scan.
Claim 2
Dependent Claim
93 words
In a moving target indication system wherein a field of view is repeatedly scanned with detection means, the combination of, means for developing and storing information of said field of view from a first scan, means for developing later information of said field of view from a succeeding scan, means for comparing said later information with said stored information from said first scan, and to indicate any difference therebetween, and means for effecting adjustment of said later information to compensate for any misalignment of said succeeding scan as compared to said first scan.
Claim 3
Dependent Claim
40 words
In a moving target indication system, the combination according to claim 1 wherein said means for effecting adjustment of said later information includes means for determining said misalignment during any small portion, including the initial portion of said succeeding scan.
Claim 4
Dependent Claim
34 words
In a moving target indication system, the combination according to claim 2 wherein said means for determining said misalignment is responsive to corresponding field-of-view information from small portions of said first and succeeding scans.
Claim 5
Dependent Claim
38 words
In a moving target indication system, the combination according to claim 2 wherein the means for effecting adjustment includes means responsive to said signal to alter the information of said field of view obtained during said succeeding scan.
Claim 6
Dependent Claim
50 words
In a moving target indication system, the combination according to claim 4 wherein said scans are performed by apparatus for effecting viewing scans of said field and said adjustment means is responsive to said misalignment to change the viewing scan for said later scan as compared to said first scan.
Claim 7
Dependent Claim
62 words
In a moving target indication system, the combination according to claim 5 wherein the means for developing said information of said field of view comprises a linear array of detectors which are moved across said field normal to the length of said array, and wherein said information is the result of periodic sampling with said detectors during such movement of said array.
Claim 8
Dependent Claim
50 words
In a moving target indication system, the combination according to claim 6 wherein by comparing such periodic sampling with said detectors over a predetermined portion of the scan movement of said several scans with said detector array affords a correction signal of the misalignment of said first and succeeding scans.
Claim 9
Dependent Claim
36 words
In a moving target indication system, the combination according to claim 7 wherein the means for effecting adjustment includes means responsive to said signal to alter the position of said linear array during such succeeding scan.
Claim 10
Dependent Claim
27 words
In a moving target indication system, the combination according to claim 8 wherein said signal is used to adjust the succeeding scan to correct for such misalignment.
Claim 11
Dependent Claim
38 words
In a moving target indication system, the combination according to claim 9 wherein the means for effecting adjustment includes means responsive to said signal to alter the physical relationship between the linear array and the field of view.
Claim 12
Dependent Claim
69 words
In a moving target indication system, the combination according to claim 10 wherein said signal is obtained from the equation of ##EQU2## wherein δ is the correction signal and S A and S B are the sensor signal sample values from adjacent samplings during the succeeding scan and S' A and S' B are corresponding signals of sample values from the first scan, and α and Δ are constants.
Claim 13
Independent Claim
143 words
The method of providing an indication of movement within a given field of view comprising the steps of, causing field-of-view scanning apparatus to perform a first scan thereof and to determine information accordingly of said field, storing said information from said first scan, causing said scanning apparatus to perform a succeeding scan of said field and to determine information prevailing at the time of said succeeding scan, comparing a predetermined portion of the information from said succeeding scan with the information of the corresponding portion of said first scan and developing therefrom a signal indicating the misalignment of said predetermined portion of said succeeding scan with the corresponding portion of said first scan, and correcting the remaining portion of the information of said succeeding scan so that it can be accurately compared with the corresponding portion of the information from said first scan.
Claim 14
Independent Claim
143 words
The method of providing an indication of movement within a given field of view comprising the steps of, causing field-of-view scanning apparatus to perform a first scan thereof and to determine information accordingly of said field, storing said information from said first scan, causing said scanning apparatus to perform a succeeding scan of said field and to determine information prevailing at the time of said succeeding scan, comparing a predetermined portion of the information from said succeeding scan with the information of the corresponding portion of said first scan and developing therefrom a signal indicating the misalignment of said predetermined portion of said succeeding scan with the corresponding portion of said first scan, and correcting the remaining portion of the information of said succeeding scan so that it can be accurately compared with the corresponding portion of the information from said first scan.
Claim 15
Dependent Claim
38 words
The method according to claim 12 wherein said misalignment signal is derived from a comparison of the scan information from areas of the field of view where no changes have taken place between said first and succeeding scans.
Claim 16
Dependent Claim
24 words
The method according to claim 13 wherein the step of correcting includes changing the relationship between the scanning apparatus and the field of view.
Claim 17
Dependent Claim
37 words
The method according to claim 14 wherein the step of correcting includes changing the timing of the signals derived from said succeeding scan for proper comparison of the information from said scans in a frame-to-frame differencing process.
Claim 18
Dependent Claim
55 words
The method according to claim 15 wherein the step of correcting includes solving the following equation ##EQU3## wherein S A and S B are signal values from adjacent pixels in a succeeding scan and S' A and S' B are signal values from adjacent pixels in a first scan, and α and Δ are constants.
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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) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |