Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 7982672 | Reception device A reception device includes a receiver, a direction detector, a location information acquisition component and a location calculator. The receiver receives broadcast signals sent from transmission towers, respectively. The direction detector detects reception direct... | 07/19/2011 |
| 7348924 | Method of positioning the antennas of a data transmission system The invention pertains to a method of positioning antennas with sectorization in a data transmission system. The method makes it possible to search, by successive approximations, for the sector of each antenna allowing optimal reception of the information. The searc... | 03/25/2008 |
| 7304609 | Hybrid wireless ranging system and associated methods A wireless ranging system includes a first wireless unit and a second wireless unit spaced therefrom. The first wireless unit may include a time-of-arrival (TOA) wireless transmitter, and a near-field electromagnetic (NFE) wireless transmitter having a settable oper... | 12/04/2007 |
| 7280073 | Method and system for determining direction of transmission using multi-facet antenna A method for determining direction of transmission using an antenna array having a number of panels is disclosed. Each panel is configured to receive signals. According to one aspect of the method, each of the panels is directed to receive signals from a transmittin... | 10/09/2007 |
| 7042394 | Method and system for determining direction of transmission using multi-facet antenna A method for determining direction of transmission using an antenna array having a number of panels is disclosed. Each panel is configured to receive signals. According to one aspect of the method, each of the panels is directed to receive signals from a transmittin... | 05/09/2006 |
| 6774845 | Single receiver wireless tracking system A configurable directional antenna includes a center antenna element, a plurality of second antenna elements, and a switch matrix. Each second antenna element, together with the center antenna element, defines an antenna sector. A first portion of the second antenna... | 08/10/2004 |
| 6661378 | Active high density multi-element directional antenna system Active high density multi-element antenna system [DS] for radiolocation of RF target radiation has a processor-controlled antenna array [CAA] having rings [R1, R2, R3] concentric about a central axis to define arcuate sectors Sn about the centr... | 12/09/2003 |
| 6573865 | Method and apparatus for radio location This disclosure relates to multi-element antenna clusters or arrays for the reception and transmission of radio waves for direction-finding, navigation aid and emitter and/or receiver location purposes. In particular, it relates to arrangements of multipl... | 06/03/2003 |
| 5745078 | Method and apparatus for radio location This disclosure relates to multi-element antenna clusters or arrays for the reception and transmission of radio waves for direction-finding, navigation aid and emitter and/or receiver location purposes. In particular, it relates to arrangements of multipl... | 04/28/1998 |
| 5355141 | Channelized bearing processor A channelised bearing processor comprises a channelised receiver consisting of a plurality of i.f. receivers (34 to 42) covering contiguous parts of a predetermined frequency range. Each of the receivers (34 to 42) is connected to a respective, continuous... | 10/11/1994 |
| 5274389 | Broadband direction finding system An amplitude monopulse direction finding system is disclosed. The system is built around a circular array with a circular lens in which the antenna elements and array ports are larger than in conventional systems. The oversized antenna elements and array ... | 12/28/1993 |
| 5255000 | Transmission signal direction finding apparatus and method An apparatus and method for measuring the angles of arrival of a pair of transmission signals relative to a fixed antenna pair simultaneously receiving the transmission signals based upon the phase difference between antennas for each signal and the frequ... | 10/19/1993 |
| 5160934 | Cross-switched MICRAD seeker A MICrowave RADiometric (MICRAD) guidance system is disclosed which utilizes an antenna having four beams, designated right, left, up and down. Information from the four beams is monitored essentially 100% of the time by passing through appropriate ferrit... | 11/03/1992 |
| 5148180 | Method and apparatus for passive direction finding with sideband determination A method and apparatus are provided for passive direction finding that demines the sideband and angle of arrival of an incoming radio signal. A four-channel superheterodyne receiver generates quadrature between the radio signals received by each channel.... | 09/15/1992 |
| 5084709 | Method and apparatus for radio location This disclosure relates to multi-element antenna clusters or arrays for the reception and transmission of radio waves for direction-finding, navigation aid and emitter and/or receiver location purposes. In particular, it relates to arrangements of multipl... | 01/28/1992 |
| 5053784 | Apparatus and method for measuring the azimuth and elevation of an object The present invention concerns an apparatus and method for measuring the azimuth and elevation of an object. The apparatus includes a platform; a base plate arranged to the construction of the platform rotatably in a plane, which is essentially horizontal... | 10/01/1991 |
| 4991147 | Preformed beam tracker Apparatus and method for sonar or radar target tracking. Digital apparatus nd techniques are employed. A variable delay is used for beam steering.... | 02/05/1991 |
| 4929958 | High precision radar detection system and method A radar detection system with four transducers accurately determines the azimuth angle of a radar emitting object. The three strongest signals from the four transducers are combined to generate two differential signal values. A table is provided which con... | 05/29/1990 |
| 4780722 | Radio direction-finding A radio direction-finding system comprises at least two adjacent, coplanar rectilinear antenna arrays (ARR1, ARR2) which face in different directions; phase measurements are performed on pairs of antennae of different spacings (ANT | 10/25/1988 |
| 4313117 | Method and apparatus for electrically scanning an antenna array in a monopulse DF radar system From an antenna array of a plurality of fixed, narrow beamwidth antennas, geographically oriented to provide omnidirectional coverage, first and second sets of antennas are selected in sequence. The first selected set includes several pairs of oppositely ... | 01/26/1982 |
| 4210913 | Passive detection and tracking apparatus 1. In passive detection and tracking apparatus, in combination, a plurality of directional signal obtaining means for obtaining from radiant energy received from the same source a plurality of signals which vary in predetermined manners with variations in... | 07/01/1980 |
| 4198705 | Directional energy receiving systems for use in the automatic indication of the direction of arrival of the received signal A fixed array of three identical directional receivers, each having a carid directional pattern, are arranged in a symmetrical configuration with each receiver having its principal axis of maximum sensitivity oriented 120° from the corresponding axes of... | 04/15/1980 |
| 4198633 | Electronic signal processing system Disclosed is an electronic signal processing system for an alternating voltage input signal. A phase-locked loop network has an input adapted to receive the signal and produce an intermediate signal comprising a substantially noise free sine wave with a p... | 04/15/1980 |
| 4152703 | Homing device A homing system utilizing a loop antenna positioned at approximately 45° to the vertical to provide an electromagnetic field having both horizontal and vertical components. These signal components are picked up by a vertical loop stick antenna alternatel... | 05/01/1979 |
| 4114157 | Bearing detection system A bearing detection system used in an Airborne Collision Avoidance System. The detection end of the system is formed as a directional antenna having 3 directional antenna elements extending radially at a 120° angle with each other. The antenna element ha... | 09/12/1978 |
| 3976151 | Self-propelled golf cart A self-propelled, battery powered vehicle adapted to carry golf clubs and the like and including means to automatically follow a golfer carrying a small transmitter as he walks about a golf course. The transmitter generates a signal pattern which magnetic... | 08/24/1976 |
| 3965473 | Direction finders A direction finder having an antenna system adapted to receive signals and provided with a right-hand and a left-hand lobe system. By coupling means said lobe systems can be made alternately operative. A comparison means is arranged for comparing received... | 06/22/1976 |
| 3936832 | System to process antenna beams to obtain the angular location of target with high resolution and accuracy The system comprises a set of 16 antennas disposed so that their beams ovap to cover completely some sector of area; a mixing system to provide a plurality of I.F. signals; a first detector for each I.F. signal which applies this signal to a comparison a... | 02/03/1976 |
