US3787840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar moving target processing method and apparatus
Assignee: Lockheed Martin Tactical Systems Inc
•
Filing: 1972-04-17
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Granted: 1974-01-22
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Expires: 1992-04-17
Abstract
Abstract A method and apparatus of processing side looking radar data to detect moving targets in a high clutter environment independent of the direction of the motion of the target. The radar phase history generated by a synthetic aperture radar system is processed in a radar optical correlator which has a scanning aperture placed at the azimuth transform plane. The amount of movement of the image of the viewing plane of the correlator as the scanning aperture moves is directly proportional to the movement of the target.
Inventors
- 👤 C Dotson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:51
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/88; G01S13/89; G01S13/90; G01S13/9021; G01S13/9029; G01S13/02; G01S13/50; G01S13/52; G01S13/9004; G01S13/9005
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
75 words
A method of processing radar return signals to detect moving targets, comprising the steps of 1. converting the return signals into optical signals; 2. storing optical signals on film; 3. projecting the stored information from the film to an optical correlator; 4. passing a scanning aperture transversely across the projected image in the correlator; 5. detecting the amount of movement of the image of the target; and 6. calculating target movement from the detected movement.
Claim 2
Independent Claim
75 words
A method of processing radar return signals to detect moving targets, comprising the steps of 1. converting the return signals into optical signals; 2. storing optical signals on film; 3. projecting the stored information from the film to an optical correlator; 4. passing a scanning aperture transversely across the projected image in the correlator; 5. detecting the amount of movement of the image of the target; and 6. calculating target movement from the detected movement.
Claim 3
Dependent Claim
5 words
storing optical signals on film;
Claim 4
Dependent Claim
5 words
storing optical signals on film;
Claim 5
Dependent Claim
20 words
The method according to claim 1 wherein the scanning aperture is located at the azimuth transform plane of the correlator.
Claim 6
Dependent Claim
79 words
The method according to claim 1 wherein target movement is calculated in accordance with the equations Maz Beta Ro (V2/(V - vt)2 - 1 + vt/V ) and Mrad Beta Ro v /V , where Beta angle included by the focusing rays, Ro target distance perpendicular to flight path, V aircraft velocity, vt component of target velocity tangential to flight path, v component of target velocity perpendicular to flight path, Maz image azimuth motion, and Mrad image radial motion.
Claim 7
Dependent Claim
11 words
projecting the stored information from the film to an optical correlator;
Claim 8
Dependent Claim
11 words
projecting the stored information from the film to an optical correlator;
Claim 9
Dependent Claim
12 words
passing a scanning aperture transversely across the projected image in the correlator;
Claim 10
Dependent Claim
12 words
passing a scanning aperture transversely across the projected image in the correlator;
Claim 11
Dependent Claim
12 words
detecting the amount of movement of the image of the target; and
Claim 12
Dependent Claim
12 words
detecting the amount of movement of the image of the target; and
Claim 13
Dependent Claim
7 words
calculating target movement from the detected movement.
Claim 14
Dependent Claim
7 words
calculating target movement from the detected movement.
References Cited (Backward Citations)
US3184679A
Cited
US3483557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |