General Dynamics

About: General Dynamics is a company organization based out in Fairfax, Virginia, United States. It is known for research contribution in the topics: Signal & Propellant. The organization has 5722 authors who have published 5819 publications receiving 85768 citations. The organization is also known as: GD & General Dynamics Corporation.

Methods and apparatus for multiple-antenna communication of wireless signals with embedded pilot signals

Abstract: Embodiments of methods and apparatus for wirelessly communicating signals include one or more transmitters configured to generate a plurality of wireless signal for transmission. Each of the wireless signals includes a plurality of pilot signals represented in a plurality of unevenly spaced, in-band subcarriers. Pilot signals of each wireless signal are positioned at subcarriers that are orthogonal in frequency with subcarriers at which pilot signals of all other wireless signals are positioned. According to an embodiment, subcarrier indices each the plurality of pilot signals are determined using a third order or higher order polynomial parameterization of pilot subcarriers in conjunction with a convex optimization algorithm to produce pilot signals having near-optimal channel estimate mean square error (MSE) performance. The wireless signals are simultaneously radiated over a wireless communication channel using a plurality of co-located or distributed antennas.

Method of fabricating thin graphite reinforced composites of uniform thickness

Abstract: A method of making high strength, low thermal expansion thin composite structures of uniform thickness is disclosed. A plurality of resin impregnated graphite fiber sheets are laminated together to provide composite preforms. A plurality of the preforms are then bonded together in a pseudoisotropic arrangement between parallel plates. The resulting structures are especially useful as substrates for flat or slightly contoured mirrors.

Method of molding foam/aluminum flake microwave lenses

Abstract: A microwave lens is constructed of a homogeneous body of closed cell rigid polyurethane foam with aluminum flakes dispursed throughout and having a configuration defining an axis and opposed lens surfaces. The method of the invention includes selecting a mold having a cavity of the appropriate configuration, preheating the mold, and filling the mold with a mixture of low density polyurethane foam components and fine aluminum flakes evenly dispersed throughout the foam structure allowing the mixture to cool and form a body of the appropriate configuration.

Conductive resealable pouch

Abstract: A pouch for protecting electrosensitive components contained therein from physical shock and electrostatic damage during handling and storage. In one embodiment, the pouch comprises two composite panels, each comprising a sheet of conductive material as the outside layer, a sheet of electrostatic-free material as the inside layer and a layer of open cell cushioning material sandwiched therebetween. Each panel is sealed to enclose the material therein and both panels are then sealed together on both sides and one end. The open end has an interlocking closure to allow components to be inserted into the pouch and for the pouch to be thereafter closed. In another embodiment, the pouch is formed of a pair of extruded, tubular members respectively constituting the conductive material layer and the electrostatic-free material layer with sheets of cushioning material sandwiched between them. The assembly is sealed at one end and provided with a releasable closure member at the other end. The pouch may also be formed as an elongated sandwich of the three material layers described, folded in half lengthwise and sealed along the side edges.