Method and system for detecting a stream of electromagnetic pulses, and device including such a detection system and intended for electromagnetically guiding ammunition toward a target
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G06K-009/00
F41G-003/14
F41G-007/22
G01S-003/784
G01S-007/487
G01S-017/00
G01S-017/66
출원번호
US-0994523
(2011-12-16)
등록번호
US-9495595
(2016-11-15)
우선권정보
FR-10 04914 (2010-12-16)
국제출원번호
PCT/EP2011/073106
(2011-12-16)
§371/§102 date
20130903
(20130903)
국제공개번호
WO2012/080492
(2012-06-21)
발명자
/ 주소
Perruchot, Ludovic
Lonjaret, Hervé
Beche, Arnaud
출원인 / 주소
THALES
대리인 / 주소
Troutman Sanders LLP
인용정보
피인용 횟수 :
0인용 특허 :
3
초록▼
A method for detecting a stream of electromagnetic pulses emitted, according to a predefined occurrence law, in a scene observed using a detection system comprising a matrix detector and a processing unit for processing signals comprising the electromagnetic pulses. The method includes the following
A method for detecting a stream of electromagnetic pulses emitted, according to a predefined occurrence law, in a scene observed using a detection system comprising a matrix detector and a processing unit for processing signals comprising the electromagnetic pulses. The method includes the following steps: acquiring and transmitting the signals from the matrix detector to the processing unit, and for each pixel of the detector calculating a subtraction signal between two signals acquired during two consecutive time windows of the same length, calculating a signal for accumulating the subtraction signals spaced apart in time by an interval defined by the predefined occurrence law, and thresholding the accumulation signal, the pulse being detected if the accumulation signal is greater than a predetermined threshold for at least one pixel, and locating the pulse detected in the observed scene from the coordinates of the pixel including the detected pulse.
대표청구항▼
1. A method for detecting a flow of electromagnetic pulses transmitted, according to a predefined occurrence law, in a scene observed by an operator, the predefined occurrence law defining a predetermined time interval between the electromagnetic pulses, the method using a detection system detecting
1. A method for detecting a flow of electromagnetic pulses transmitted, according to a predefined occurrence law, in a scene observed by an operator, the predefined occurrence law defining a predetermined time interval between the electromagnetic pulses, the method using a detection system detecting a stream of electromagnetic pulses including a matrix detector having a plurality of pixels and detecting signals for each pixel, and a processing unit processing the signals, the signals including the electromagnetic pulses, the method comprising the steps of: acquiring signals by the matrix detector, each signal being associated with a respective pixel of the matrix detector and being acquired during a time window having a duration that is shorter than a duration of the predetermined time interval;transmitting the signals from the matrix detector to the processing unit;calculating, by the processing unit, a subtraction signal for each pixel and for each time window, the subtraction signal being the difference between the respective signal, associated with the pixel, acquired during the time window, and a consecutive signal, associated with the pixel, acquired during a consecutive time window of the same duration;calculating, using the processing unit, a plurality of accumulation signals for each pixel, each accumulation signal being the sum of a plurality of subtraction signals spaced apart in time by an intervening time which is equal to an integer multiple of the predetermined time interval plus or minus one hundredth of the duration of the time window;thresholding, using the processing unit, the accumulation signals for each pixel, the flow of electromagnetic pulses being detected if at least one of the accumulation signals is above a predetermined threshold for at least one pixel; andlocating the detected electromagnetic pulses in the observations scene from coordinates of the pixel comprising the detected electromagnetic pulses. 2. The detection method according to claim 1, wherein the matrix detector is a matrix of sensors capable of performing a continuous acquisition of signals and the signal acquired during a time window is the instantaneous signal at a given moment of that time window. 3. The detection method according to claim 1, wherein the matrix detector is a matrix of sensors having a same integration time, the signals acquired by the detector over one time window being the integration in time over the time window of the instantaneous signal received by the sensor. 4. The detection method according to claim 1, wherein the predetermined time interval is constant. 5. The detection method according to claim 4, wherein the predetermined time interval is between 50 and 100 msec. 6. The detection method according to claim 1, wherein the predetermined threshold corresponds to a signal-to-noise ratio between 7 and 14. 7. The detection method according to claim 1, wherein the predetermined threshold is calculated from the local noise in the signals acquired by the matrix detector. 8. A system for detecting a flow of electromagnetic pulses transmitted according to a predefined occurrence law in an observation scene, the predefined occurrence law defining a predetermined time interval between the electromagnetic pulses, the system including a matrix detector having a plurality of pixels and detecting signals for each pixel, and a processing unit connected to the matrix detector, processing the signals, the signals including the electromagnetic pulses, each signal being associated with a respective pixel of the matrix detector and being acquired during a time window having a duration that is shorter than a duration of the predetermined time interval, the processing unit receiving the signals acquired and transmitted by the matrix detector, the system comprising: a first calculator calculating a subtraction signal for each pixel and for each time window, the subtraction signal being the difference between the signal, associated with the pixel, acquired during the time window, and a consecutive signal, associated with the pixel, acquired during a consecutive time window of the same duration;a second calculator calculating accumulation signals for each pixel, each accumulation signal being the sum of a plurality of subtraction signals spaced apart in time by an intervening time which is equal to an integer multiple of the predetermined time interval plus or minus one hundredth of the duration of the time window;a thresholder thresholding the accumulation signals for each pixel, the flow of electromagnetic pulses being detected if at least one of the accumulation signals is greater than a predetermined threshold for at least one pixel; anda locator locating the detected electromagnetic pulses in the observation scene from the coordinates of the pixel comprising the detected electromagnetic pulse, whereinthe detection system is capable of implementing the method according to claim 1. 9. A device for electromagnetically guiding ammunition toward a target, the target being identified by a flow of electromagnetic pulses, the device comprising: a system for detecting a flow of electromagnetic pulses according to claim 8 to detect and locate a flow of electromagnetic pulses identifying the target, anda guidance device guiding the ammunition toward the target from the detection of the flow of electromagnetic pulses by the detection system,wherein the detection system is connected to the guidance device and transmits the location of the detected flow of electromagnetic pulses to it. 10. The detection method according to claim 1, wherein the intervening time is equal to the predetermined time interval, plus or minus one hundredth of the duration of the time window.
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이 특허에 인용된 특허 (3)
Farrier Michael G. (Redwood Shores CA) Kamasz Stacy R. (Waterloo CAX) Ma Fred S. F. (Scarborough CAX) Bendett Mark P. (Ann Arbor MI), Charge coupled device pulse discriminator.
Merle Jean-Pierre,FRX ; Solenne Thierry,FRX ; Ni Yang,FRX ; Devos Francis,FRX, Photosensitive detector and mosaic of photosensitive detectors for the detection of luminous flashes and applications.
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