Abstract:
An extended Kalman filter (EKF) is combined with a fixed epoch smoother (FES) to produce a new variable lag smoother (VLS). The fixed epoch lags EKF measurement time-tags with variable time lag. The combination of EKF and FES is referred to herein as a variable lag smoother (VLS).
Abstract:
An extended Kalman filter (EKF) is combined with a fixed epoch smoother (FES) to produce a new variable lag smoother (VLS). The fixed epoch lags EKF measurement time-tags with variable time lag. The combination of EKF and FES is referred to herein as a variable lag smoother (VLS).
Abstract:
Sequential GPS Doppler carrier phase count measurements are used for precision sequential determination of position and velocity of a GPS receiver, such as for orbit determination and geolocation, with minimum throughput time. Real-time orbit determination and geolocation performance is enabled with an optimal sequential filter, and near-real-time performance is enabled with an optimal fixed-lag smoother. Many problems associated with prior art orbit determination are eliminated by addressing the “cycle slip” problem, the unknown initial range problem with RANGECP measurement representations, the problem of serial correlation in the measurements due to reprocessing of overlapping thermal noise. Also, the present invention significantly attenuates the carrier signal phase variation due to rotation of receiver antenna relative to transmitter antenna because the sequential phase count time intervals are sufficiently short.
Abstract:
An apparatus for and a method of forming a surface finish on a top surface of a drain cover for swimming pools or spas so that the surface finish of the drain cover matches the surface finish of the pool or spa. The apparatus comprises a ring shaped structure that is adapted to be positioned on the top surface of the drain cover wherein the ring is mounted along the general outer perimeter of the top surface of the drain cover. An exposed aggregate or plaster finish is then formed on the top surface of the cover enclosed by the ring so that the ring retains and shapes the surface finish.
Abstract:
A fiber optic harness assembly having reduced weight and bulk comprises a plurality of optical fibers and loose tube protective buffers therefor. At least two of the optical fibers and corresponding buffers are routed commonly along a first branch of the harness and respectively along the second and third branches of the harness. Similarly, strength elements extending parallel to corresponding optical fibers are routed commonly along the first branch to the intersection whereat the strength elements are divided into separate portions for extension respectively along the second and third branches. The strength elements and buffered optical fibers coextending along the harness branches are surrounded and held bundled together in contiguous relationship by respective branch portions of an outer jacket or sheath. The ends of the branches are terminated by connectors which have provision for terminating the strength elements to a connector body independently of optical contacts at the ends of the optical fibers, thereby to isolate the optical contacts from mechanical loads applied to the harness. The harness assembly can be repaired by detaching the optical contact from the end of the optical fiber to be repaired, withdrawing the optical fiber from the protective buffer, inserting a new optical fiber into the protective buffer, and connecting an optical contact to one or both ends of the new optical fiber.
Abstract:
What is proposed is an apparatus for a shielded terminal connector that eliminates EMI leakage from coaxial cables in which a resilient bushing of a conductive material is inserted between exposed shield portions of the coaxial cable and the interior surface of a backshell housing, the latter being compressed onto a connector housing for the cable and the resilient bushing itself so that the bushing is gripped tightly by the backshell housing and thus completely fills the space between the exposed shield portions of the cable and the surrounding interior surface of the backshell housing.
Abstract:
The invention relates to a semi-permanent backshell and connector assembly for use with a harness having a plurality of conductors. More particularly, the invention relates to a connector and backshell assembly that inhibits unauthorized service and repair. The invention comprises a connector, an annular adapter sleeve, and a backshell. The adapter sleeve defines a locking surface that has at least on dog extending therefrom. The dog engages tooth-like projections on the connector. The adapter sleeve can rotate relative to the cylindrical extension before the backshell is installed due to the at least one dog being displaceable away from the tooth-like projections, and the adapter sleeve cannot rotate relative to the cylindrical extension after the backshell is installed due to the stopping surface preventing the at least one dog from displacing away from the tooth-like projections.
Abstract:
A connector device and method of use thereof provide positioning and hermetic sealing of electrical contacts in protective housings. The housings protect wires which connect the speed sensor of a turbine engine to a display. The connector supports the electrical contacts in an electrical insulator. The connector includes a malleable flange which is adapted to be hermetically sealed between two housings which protect wires connected to the speed sensor in the turbine engine. The flange is hermetically sealed between a tongue on one housing and a groove in the other housing. The sealing flange extends radially from the central axis of the connector and is compressed by the tongue of a releasable housing into the groove of a permanent housing to form a hermetic seal. The flange supports the electrical insulator which holds electrically conducting inner contacts in position to be slideably mounted into outer contacts which are supported by the connector housing.
Abstract:
An integrated capacitor having an oxide layer of less than 500 .ANG. as a dielectric or insulator. A method of fabricating a capacitor including the steps of forming an oxide layer on a substrate, forming through the oxide layer a first capacitor plate in the substrate, and forming a second capacitor plate on the oxide layer. The method also includes the step of restructuring the oxide layer after the step of forming the first capacitor plate. Since the first capacitor plate is formed through the oxide layer the oxide layer can be grown on an undoped or lightly doped substrate; thus, the effects of the doping level on the growth rate of the oxide layer are eliminated and oxide layers having a uniform thickness of less than 500 .ANG. can consistently be provided.
Abstract:
An improved wet caustic process of the Bayer method for the extraction of alumina from bauxite containing amounts of both goethite and a monohydrated alumina wherein lime is added only after the bauxite slurry has been heated to a digestion temperature of at least 200.degree.C.