Polarized semi-active laser last pulse logic seeker using a staring focal plane array
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01C-021/24
G01C-021/00
G02F-001/01
출원번호
US-0853748
(2004-05-24)
발명자
/ 주소
English,James E.
Pittman,William C.
출원인 / 주소
The United States of America as represented by the Secretary of the Army
인용정보
피인용 횟수 :
15인용 특허 :
9
초록▼
An improvement in a semi-active laser last pulse logic missile seeker is disclosed and claimed. In one embodiment, the improvement includes a first polarizer disposed in the detection field of view of the PIN photodiode detector and a second polarizer disposed in the detection field of view of the s
An improvement in a semi-active laser last pulse logic missile seeker is disclosed and claimed. In one embodiment, the improvement includes a first polarizer disposed in the detection field of view of the PIN photodiode detector and a second polarizer disposed in the detection field of view of the staring imaging infrared focal plane array. Each of the first and second polarizers has an identically configured plurality of segments. Each segment allows transmission of a different polarization than other segments and is sized to completely cover the fields of view of both the PIN photodiode detector and the staring imaging infrared focal plane array. First and second actuators are connected to the first and second polarizers, respectively, to synchronously and simultaneously step identical and corresponding segments in a plurality of discrete steps within the fields of view in response to incoming temporal and spatial laser returns.
대표청구항▼
What is claimed is: 1. An improvement in a semi-active laser last pulse logic missile seeker, the seeker having a single PIN photodiode detector, a staring imaging infrared focal plane array detector, means for correlating incoming temporal laser returns detected by the PIN photodiode detector with
What is claimed is: 1. An improvement in a semi-active laser last pulse logic missile seeker, the seeker having a single PIN photodiode detector, a staring imaging infrared focal plane array detector, means for correlating incoming temporal laser returns detected by the PIN photodiode detector with incoming spatial returns received by the staring imaging infrared focal plane array detector, and means for identifying, on the staring imaging infrared focal plane, the spatial laser return indicative of a laser-illuminated target, wherein the improvement comprises: a first polarizer disposed in a field of view of the PIN photodiode detector, the first polarizer having a first plurality of segments, each segment sized to completely cover the field of view of the PIN photodiode detector, wherein each segment allows transmission of a different polarization than other segments within the first plurality of segments; a second polarizer disposed in a detection field of view of the staring imaging infrared focal plane array, the second polarizer having a second plurality of segments corresponding to the plurality of segments of the first polarizer, each segment of the second plurality of segments sized to completely cover the field of view of the staring imaging infrared focal plane array, wherein each segment allows transmission of a different polarization than other segments within the second plurality of segments; and first and second actuators connected to the first and second polarizers to synchronously and simultaneously step corresponding segments of the first and second plurality of segments in a plurality of discrete steps within the corresponding fields of view in response to the incoming temporal and spatial laser returns. 2. The improvement of claim 1, wherein a segment of the first plurality of segments is identical in degree and pattern of polarization to a segment of the second plurality of segments. 3. The improvement of claim 2, wherein each of the first and second pluralities of segments includes one non-polarized segment. 4. The improvement of claim 2, wherein the number of segments within the first plurality of segments is five. 5. The improvement of claim 4, wherein the number of steps within the plurality of discrete steps is four. 6. The improvement of claim 2, wherein the first plurality of segments includes three linear polarization segments, each linear polarization segment having a corresponding polarization angle. 7. The improvement of claim 6, wherein the polarization angle of one of the linear polarization segments is 45 degrees. 8. The improvement of claim 6, wherein the polarization angle of one of the linear polarization segments is 90 degrees. 9. The improvement of claim 6, wherein the polarization angle of one of the linear polarization segments is 0 degrees. 10. The improvement of claim 2, wherein the first plurality of segments includes one circular polarization segment. 11. A method of distinguishing a laser-illuminated target from background radiation using a semi-active laser last pulse logic missile seeker, the seeker having a single PIN photodiode detector or four quadrant detectors, a staring imaging infrared focal plane array detector, means for correlating incoming temporal laser returns detected by the PIN photodiode detector with incoming spatial returns received by the staring imaging infrared focal plane array detector, and means for identifying, on the staring imaging infrared focal plane, the spatial laser return indicative of a laser-illuminated target, the method comprising: disposing a first polarizer in the field of view of the PIN photodiode detector, the first polarizer having a first plurality of segments, each segment sized to completely cover the field of view of the PIN photodiode detector, wherein each segment allows transmission of a different polarization than other segments within the first plurality of segments; disposing a second polarizer disposed in the detection field of view of the staring imaging infrared focal plane array, the second polarizer having a second plurality of segments corresponding to the plurality of segments of the first polarizer, each segment of the second plurality of segments sized to completely cover the field of view of the staring imaging infrared focal plane array, wherein each segment allows transmission of a different polarization than other segments within the second plurality of segments; and synchronously and simultaneously stepping corresponding segments of the first and second plurality of segments in a plurality of discrete steps within the corresponding fields of view in response to the incoming temporal and spatial laser returns. 12. The method of claim 11, further comprising: correlating incoming polarized temporal laser returns detected by the PIN photodiode detector with incoming polarized spatial returns received by the staring imaging infrared focal plane array detector. 13. The method of claim 12, further comprising: identifying, on the staring imaging infrared focal plane array, the polarized spatial laser return indicative of the laser-illuminated target. 14. The method of claim 11, wherein the segment stepped to completely cover the field of view of the PIN photodiode detector is identical to the segment synchronously and simultaneously stepped to completely cover the field of view of the staring imaging infrared focal plane array. 15. The method of claim 14, wherein the first plurality of segments includes three linear polarization segments, each linear polarization segment having a corresponding polarization angle. 16. The method of claim 15, wherein the polarization angle of one of the linear polarization segments is 45 degrees. 17. The method of claim 15, wherein the polarization angle of one of the linear polarization segments is 90 degrees. 18. The method of claim 15, wherein the polarization angle of one of the linear polarization segments is 0 degrees. 19. The method of claim 11, wherein the first plurality of segments includes one non-polarized segment. 20. The method of claim 11, wherein the number of segments in the first plurality of segments is five. 21. The method of claim 11, wherein the number of steps in the plurality of discrete steps is four. 22. The method of claim 11, wherein the first plurality of segments includes one circular polarization segment.
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English James E. ; White Ronald O. ; Springer James L. ; Schneider Raymond W., Semi-active laser last pulse logic seeker utilizing a focal plane array.
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