摘要:
The invention relates to a four-quadrant detector based optical system for detecting and tracking an optical spot, which comprises: (a) a four quadrant detector, which comprises four surfaces that are sensitive to light, said surfaces being separated one from the others by a dead zone surface which is non-sensitive to light radiation; (b) optics between said detector and the scenery, for acquiring an image of a light spot at the scenery, and for impinging the image of the same on said surfaces of the decoder; and (c) a refraction element between said detector and the other optics, which comprises grooves for diverting only the light rays coming from the scenery and directed toward the dead zone, each to a corresponding proximate sensitive to light surfaces of the decoder, while not disturbing the other coming light rays, wherein said refraction element has no physical contact with any of said detector surfaces.
摘要:
A system and method for protection of aircraft against surface-to-air missiles deploys sensors to provide coverage around an airport The use of a fixed (or slow moving) set of sensors around the airport allows detection of missile threats to all aircraft using the airport without requiring each individual aircraft to be provided with a threat detection system. Information about a detected threat is then typically transmitted in real time directly to the aircraft under threat to allow timely deployment of aircraft-based countermeasures. The detection system and method preferably employ spaced-apart sensors with overlapping fields of view to provide enhanced tracking through triangulation and reduced false alarm rates by redundancy of information. Airborne systems with overlapping coverage may be also used.
摘要:
A warhead including a first section with a dish-shaped first fragmentation layer, and a second section with a barrel-shaped second fragmentation layer.
摘要:
A method for sharing visual situational information of objects among a number of command and control units. The method includes the steps of providing to each command and control unit a mechanism for storing a digital reference map of a geographical area, receiving by one or more command and control unit an image of a scene which includes one or more object within the geographical area, registration of the received image of the scene to the digital reference map, updating a situational information of the object in the reference map, and transferring the updating of the situational information to one or more other command and control unit.
摘要:
An optical system for receiving an incoming beam of electromagnetic radiation, for dividing it into a transmitted beam, containing a part of the wavelength band of the incoming beam, and a reflected beam, containing the remainder of the wavelengths in the incoming beam, and for transferring the transmitted beam continuously to a detector. The system is capable of switching the reflected beam between any one of two or more detectors. The system comprises an objective lens, a dichroic beamsplitter cube, a first detector, capable of detecting radiation in a first wavelength band, a second group of two or more detectors, each capable of detecting radiation in a second wavelength band and means of rotating the dichroic beamsplitter cube, so as to switch between the detectors of the second group.
摘要:
A device for fiber optic free-space optical communication between electronic components, having no physical communication connection, in which terminal ends of optical fibers are aligned such that light emitting from the terminal end of one optical fiber is transmitted across free-space and received by the terminal end of another optical fiber. The light thusly received is transmitted to a corresponding transceiver, to which the optical fiber is connected, deployed on the electronic component, thereby establishing optical communication between two transceivers across the free-space separating the two terminal ends.
摘要:
An airborne reconnaissance system comprising: (1) Gimbals having at least two degrees of freedom; (2) At least one array of light sensors positioned on the gimbals, for being directed by the same within at least two degrees of freedom; (3) Map storage means for storing at least one Digital Elevation Map of an area of interest, divided into portions; (4) Inertial Navigation System for real-time providing to a gimbals control unit navigation and orientation data of the aircraft with respect to a predefined global axes system;(5) Portion selection unit for selecting, one at a time, another area portion from the area of interest; and (6) servo means for directing the gimbals. The system uses data from the inertial navigation system and from the digital elevation map for real-time calculating direction to selected area portions, and for maintaining the direction during integration of light from the terrain, and for producing corresponding images of area portions.
摘要:
An apparatus and method for winding an optical fiber of arbitrary diameter on a smooth conical bobbin. The apparatus includes a slotted helical ring (148) attachable to, or integrated with a bobbin, the ring used to guide a fiber (152) in its initial first turn in the winding. After the first turn, the winding of a base layer and subsequent layers is acieved without needing a grooved bobbin surface.
摘要:
An angular motion measurement system disposed on a movable platform having a first and second section, the system comprising a first and second measurement arrangement and a processor arrangement. The first measurement arrangement provides a first output indicative of angular motion of the first section and has a bandwidth above 50 Hertz and at least one of, a bias above 5 degrees per second and a scale factor above 10%. The second measurement arrangement provides a second output indicative of angular motion of the second section and has a bandwidth below 50 Hertz, a bias below 5 degrees per second and a scale factor below 10%. The processor arrangement is responsive to a plurality of inputs, which include the first and second output, generating a corrected output having a bandwidth above 50 Hertz, a bias below 5 degrees per second and a scale factor below 10%.
摘要:
A method for identifying a target region of a three-dimensional object in a two-dimensional image using a predetermined three-dimensional computer model which includes a number of main features of the three-dimensional object. The method includes designating the target region on the computer model, capturing a real scene which includes at least part of the three-dimensional object, displaying a two-dimensional representation of the real scene together with a view of the computer model, and allowing a user to manipulate the computer model by sizing, translating, or rotating. A view of the computer model and a partial view of the three-dimensional object are superimposed, in order to identify the target region in the two-dimensional representation.