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| Number | Title | Issue Date |
| 5652594 | Signal processor affording improved immunity to medium anomalies and interference in remote object detection system A signal processor is described for object detection systems such as radar and sonar systems in which wave energy is transmitted and received as a train of discrete pulses of frequencies stepped in predetermined sequence. The received signal processor com... | 07/29/1997 |
| 5570222 | Underwater viewing system for remote piloted vehicle An underwater viewing system includes a dry and wet end. Illumination energy is provided to the wet end where it is scanned and the resulting scanned illumination is directed to a scene of interest. Energy reflected from the scene is received by the wet e... | 10/29/1996 |
| 5517029 | Dual-band IR scanning focal plane assembly having two monolithically integrated linear detector arrays for simultaneous image readout A dual band IR scanning focal plane assembly includes two linear detector arrays in a close spaced configuration monolithically integrated on a common substrate. A medium wave IR staggered element linear array is formed on the front (111)B face of a (111)... | 05/14/1996 |
| 5512750 | A-dual band IR sensor having two monolithically integrated staring detector arrays for simultaneous, coincident image readout A compact dual band IR focal plane assembly provides simultaneous, coincident two-dimensional image readout. It includes a MIS-CID MWIR detector array formed in an epitaxial layer grown by the MBE process on the (111B) front face of an IR transparent crys... | 04/30/1996 |
| 5510644 | CDTE x-ray detector for use at room temperature An improved x-ray detector in the form of a p-i-n CdTe homojunction device is disclosed. The intrinsic ("i") layer is of high resistivity CdTe, while the n- and p-doped CdTe layers are epitaxially grown in a photo-assisted process in a molecular beam epit... | 04/23/1996 |
| 5510796 | Apparatus for wind shear compensation in an MTI radar system The invention relates to apparatus for reducing the masking effect in the doppler frequency domain of wind sheared clutter upon the radar returns of moving targets. The invention consists in forming two beams from the elements of a radar antenna array by ... | 04/23/1996 |
| 5504719 | Laser hydrophone and virtual array of laser hydrophones The present invention relates to a hydrophone and to a virtual array of hydrophones for sensing the amplitude, frequency, and in arrays, the direction of sonic waves in water. The hydrophone employs a laser beam which is focused upon a small "focal" volum... | 04/02/1996 |
| 5491450 | Low power consumption process-insensitive feedback amplifier A low power consumption amplifier that is essentially insensitive to the process used to fabricate the active devices of the amplifier employs feedback to minimize variations in electrical characteristics of the devices. For weight-sensitive microwave app... | 02/13/1996 |
| 5481503 | Apparatus for and method of adaptively processing sonar data The invention discloses an apparatus for and a method of adaptively processing a sonar power spectrum for improving the display of narrowband line structure characteristic of a target in a background of broadband interference which is rippled due to multi... | 01/02/1996 |
| 5477686 | Tuned split-Stirling cryorefrigerator A split-Stirling cryorefrigerator including a cylinder containing a movable displacer containing regenerator material and having an attached movable rod with a free end located in a housing enclosing a gas-spring chamber containing a gas. The cylinder has... | 12/26/1995 |
| 5479360 | Target passive ranging without an ownship maneuver A method for estimating target parameters of a target with respect to a platform such as ownship includes assigning predetermined initial values for the target parameters, wherein the target parameters are part of models having respective model probabilit... | 12/26/1995 |
| 5454885 | Method of purifying substrate from unwanted heavy metals A typical source of cadmium and tellurium is as a by-product of copper mining. Although attempts are made to remove impurities such as copper prior to commercially supplying them for forming material like cadmium telluride, cadmium zinc telluride and cadm... | 10/03/1995 |
| 5453783 | General absolute value circuit A general absolute value circuit for developing a true, symmetric or bipolar, absolute value output signal from an input charge signal, compact enough to be used on a sensor chip incorporated into (or used in combination with) a pixel processor of the typ... | 09/26/1995 |
| 5436839 | Navigation module for a semi-autonomous vehicle A fuzzy logic based navigation module for use on a semi-autonomous vehicle computes the safety of moving from predefined local regions to adjacent local regions for the purpose of planning a safe path for the vehicle to take to reach its intended destinat... | 07/25/1995 |
| 5436874 | Method and apparatus for sensing acoustic signals in a liquid An apparatus for sensing acoustic signals in a liquid wherein an omnidirectional hydrophone exhibits a hemispheric response pattern. A hydrophone, including a transducer element and a transmitting cable, is mounted such that the transducer element is adja... | 07/25/1995 |
| 5422830 | Method for tracking a maneuvering target with a slow scan rate sensor When the scan interval or time between successive potential detections is long with respect to a potential target's maneuvering capability (say on the order of ten seconds for a radar system), there is the possibility that the target may be able to deviat... | 06/06/1995 |
| 5412414 | Self monitoring/calibrating phased array radar and an interchangeable, adjustable transmit/receive sub-assembly The invention relates to a self monitoring/calibrating phased array radar in which the operating path for transmission and the operating path for reception may be monitored/calibrated by the addition of a corporate calibration network coupled at the plura... | 05/02/1995 |
| 5400038 | High signal to noise ratio optical signal processing system An optical signal processing system includes a number of optical time delay units to generate differentially time-delayed optical signals. Each optical time delay unit includes at least an in put polarizing beam splitter (PBS) system having an input syste... | 03/21/1995 |
| 5390133 | Image processor for target detection and tracking An image processor for use in detecting and tracking a plurality of targets is provided including a plurality of memory locations for storing intensity images and a signal processor coupled to the memory locations. The signal processor comprises a closed ... | 02/14/1995 |
| 5343205 | Enemy signal detection and warning system An enemy radar or transmitter transmits a signal at frequency f1. A tag on a friendly forces target receives frequency f1 and, in response thereto, transmits a signal at frequency f2.noteq.f1 modulated by a code unique to the tag. A friendly forces receiv... | 08/30/1994 |
| 5317290 | MMIC (monolithic microwave integrated circuit) switchable bidirectional phase shift network The invention relates to a switchable bidirectional phase shift network exhibiting a desired differential insertion phase suitable for use as a phase bit in a multi-bit phase shifter. The design is economical in its use of components--six field effect tra... | 05/31/1994 |
| 5310104 | Method and apparatus for cleaving a semiconductor wafer into individual die and providing for low stress die removal The invention discloses a novel method and apparatus for cleaving semiconductor wafers into individual die which comprises mounting the wafer upon an adherent resilient air impermeable membrane while the latter is flat. Cleaving is achieved by using air p... | 05/10/1994 |
| 5305135 | Underwater viewing system for remote piloted vehicle An underwater viewing system includes a dry and wet end. Illumination energy is provided to the wet end where it is scanned and the resulting scanned illumination is directed to a scene of interest. Energy reflected from the scene is received by the wet e... | 04/19/1994 |
| 5261012 | Method and system for thinning images Image data is subjected to a thinning process so as to derive a medial axis for each image. Boolean image data is reduced to lines and/or dots, each line generally being a centroid line of an image. The thinning process uses a change look-up table which i... | 11/09/1993 |
| 5258621 | Cold shield for a scanned linear IR detector array An improved cold shielding arrangement for a scanned linear IR detector array normally having the pixels arranged in plural columns, is disclosed. The arrangement consists of a first slotted cold shield plate spaced from the array and designed to reduce t... | 11/02/1993 |
| 5258618 | Infrared imager forming two narrow waveband images of the same object field The invention relates to an improved IR imaging system for detecting a target producing an IR signature obscured by an ambient IR background. The imager comprises an objective lens, preferably of a telecentric design, and an area IR detector array. Two na... | 11/02/1993 |
| 5229727 | Hermetically sealed microstrip to microstrip transition for printed circuit fabrication The transition interconnects microstrip transmission lines whose finite-width conductors are formed on the upper surface and whose ground planes are formed on the under surface of a ceramic substrate. A patternable metallizable multilayer thick film diele... | 07/20/1993 |
| 5204844 | Moment bender transducer A transducer includes a first and second spaced apart member, each member having a radiating surface for producing a wave of energy in a transmitting medium in response to a driving force, a plurality of containment devices coupled to each member and exte... | 04/20/1993 |
| 5151769 | Optically patterned RF shield for an integrated circuit chip for analog and/or digital operation at microwave frequencies The invention relates to the provision of an RF shield for an individual or a collection of integrated circuit chips in a module containing a plurality of hybrid interconnected chips generating interfering RF fields that would interfere with operation of ... | 09/29/1992 |
| 5150335 | Frequency interrupt continuous transmit active sonar transmission and signal processing technique In a time continuous transmit active sonar system the frequency of the transmitted waveform is interrupted at predetermined intervals so that a frequency discontinuity in the transmitted waveform occurs at each interruption. The starting and ending freque... | 09/22/1992 |
| 5091719 | Helmet display A helmet mountable display system may display a raster scanned image to each eye of a wearer of the helmet for presenting a stereoscopic image. The system includes a first and second lens having a respective optical axis and first and second oscillatable ... | 02/25/1992 |
| 5016193 | Pixel and line enhancement method and apparatus In computer image generation (CIG) systems, image data for defining pixel modulation values and for supporting a display having a predetermined resolution are determined for defining a scene. For some applications, such as for representing background and/... | 05/14/1991 |
| 4965745 | YIQ based color cell texture The human eye is more sensitive to brightness than to color. Accordingly, color definition is defined by a luminance or brightness (Y) component, an in-phase component (I) and a quadrature component (Q) and which are appropriately processed before being c... | 10/23/1990 |
| 4897715 | Helmet display A helmet mountable display system includes separate optical paths for providing a respective image to the left and right eye of an observer for stereoscopic viewing. Each of a first and second plurality of spaced apart, substantially point light sources s... | 01/30/1990 |
