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| Number | Title | Issue Date |
| 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 |
| 7092673 | Angle of arrival estimation in a wireless telecommunications network The present invention relates to estimating the Angle of Arrival (AoA) of a signal from a user equipment received at a base station of a wireless telecommunications network where the base station has a multi-beam antenna. A signal received from a user equipment is r... | 08/15/2006 |
| 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 |
| 6954176 | Device and method for an antenna array with switchable wide-angle coverage In order in simple manner to switchably cover a wide angle in sectors using an antenna array with broad main lobe, an antenna elements are so arranged, that the elements can be individually selected, so that some elements of the array can be operated in-phase and ot... | 10/11/2005 |
| 6907270 | Method and apparatus for reduced rank channel estimation in a communications system A method and apparatus for estimating a communication channel in a wireless communication system having multiple transmitter antennas using reduced rank estimation. The method exploits redundant and/or a priori knowledge within a system to simplify the estimation ca... | 06/14/2005 |
| 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 |
| 6271791 | Radio-signal direction finding Radio-signal direction finding is performed in the following manner. There is a plurality of antennas (A) at different locations. A switchable antenna coupler (SAC) switches (SW) from one antenna (A[i]) being coupled to a radio-signal input (INP), to anot... | 08/07/2001 |
| 5617102 | Communications transceiver using an adaptive directional antenna A directional antenna connected to a portable communications transceiver is adaptively directed towards a remote station in a communication system. The amount of RF power required by the portable device is significantly reduced, relative to a non-directio... | 04/01/1997 |
| 5122808 | Phase only bearing mesurement with amiguity correction in a collision avoidance system A receiver system for measuring the bearing of a target having ambiguity correction. The receiver system includes a four element antenna array, three receivers and two phase detectors. The system further includes switching means for selectively connecting... | 06/16/1992 |
| 5075696 | Direction finding apparatus Direction finding apparatus comprising at least ten antenna channels for connection to respective antennae in use, at least five receiver channels each coupled to at least two different antenna channels constituting a group, and circuitry for receiving an... | 12/24/1991 |
| 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 |
| 5032844 | Sky wave direction finder A system using two magnetic quadrupole antennas, two magnetic dipole antennas and means for processing the respective antenna signal outputs provides unambiguous estimates of elevation and polarization for an incident RF signal. The system uses an efficie... | 07/16/1991 |
| 4929955 | Circular waveguide amplitude commutator A circular waveguide section which is suitably excited with a TM01 and two spatially orthogonal TE11 modes to form a cosine-squared-on-a pedestal amplitude distribution at the outputs of the circular waveguide. The resulting cosine-s... | 05/29/1990 |
| 4724442 | Method and apparatus for loop direction finding with no ambiguity A method and apparatus is provided for deriving the direction of a received signal from a signal source using first and second orthogonally-mounted loop antennas and an omnidirectional antenna. In operation, output signals from each of the antennas are ge... | 02/09/1988 |
| 4719469 | Direction-determining system A direction determining system having a Global Positioning System (GPS) receiver, a linear antenna array and a fast switching facility, the linear antenna array comprised of at least two antenna elements and the GPS receiver including two Costas Loops. Th... | 01/12/1988 |
| 4658257 | Radar system A radar system includes a clock for generating timing signals of a predetermined period, an exciter for generating high frequency signals of predetermined frequencies in sequence and in time series in response to the timing signals, a transfer switch and ... | 04/14/1987 |
| 4644358 | Stem orientation measurement apparatus An apparatus to confirm an orientation of the stem of ship by making use of a satellite included in the Global Positioning System. Radio wave signals from the satellite are received by a directional or omnidirectional antenna and the phase difference betw... | 02/17/1987 |
| 4639733 | Direction finding An interferometer type DF system uses an array of five antennas (A,B,C,D,E) arranged at the apices of a regular pentagon to define five wide apertures along the sides of the pentagon and a further five apertures along the diagonals. The phases of the sign... | 01/27/1987 |
| 4636796 | Radio direction finding system A radio direction finding system comprises a receiving portion for receiving a radio signal and a direction determining portion coupled to the receiving portion for developing a direction signal corresponding to the direction of arrival of a received radi... | 01/13/1987 |
| 4481519 | Radio frequency signal direction finding apparatus A system for determining the difference in phase between a pair of radio frequency signals wherein quadrature components of one of such pair of signals are alternatively combined with the other one of such pair of radio frequency signals to provide sum an... | 11/06/1984 |
| 4356496 | Loop-coupler commutating feed for scanning a circular array antenna A multiple-port loop-coupled commutating feed for a circular or cylindrical antenna array which is circumferentially scanned. A rotor assembly having a plurality of elongated coupling loops circumferentially spaced about an arc of its perimeter is fed fro... | 10/26/1982 |
| 4317120 | Sector scan ADF system An automatic radio direction finding system having inputs for a circular array with a plurality of directional antennas, each being switched in sequence producing a directional pattern in azimuth. The combined RF signal is carried through the receiver as ... | 02/23/1982 |
| 4263597 | Nondisruptive ADF system An automatic radio direction finding (ADF) system having inputs for four quadrature antennas each having a cardioid pattern. Each input is amplitude modulated in quadrature and then combined in a hybrid circuit to produce a nondirectional pattern. The com... | 04/21/1981 |
| 4257047 | 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, a set of antennas is selected. The selected set includes first and second oppositely oriented pairs of adjacent antennas... | 03/17/1981 |
| 4216476 | Digital electronic commutator for radio direction finding system An array of antennas is sequentially sampled by digital commutation means provide a synchronous display of a synthesized antenna array pattern of reception on a cathode ray tube indicator. The commutation means and digital means for generating sine and c... | 08/05/1980 |
| 4207572 | Sky wave DF antenna system A sky wave DF antenna system is disclosed. It is able to respond to an incoming transmitted signal and define the direction of the transmitter. It utilizes six or more simple loops connected and arranged to form a spaced loop antenna system which indicate... | 06/10/1980 |
| 4194207 | Radiolocation system for determining the direction of incident electromagnetic waves An antenna array for a radiolocation system, consisting of three loop antennas in mutually orthogonal planes and three dipole antennas extending along the intersections of these planes, is scanned by a pair of synchronized multplexers sequentially connect... | 03/18/1980 |
| 4107692 | Radio frequency signal direction finding system A radio frequency signal direction finding system wherein radio frequency signals received at output ports of a multibeam array antenna are sequentially sampled, in response to a sampling signal, at a frequency fs. The sampled signals are fed t... | 08/15/1978 |
| 4062015 | Rapid azimuthal determination of radio signals Methods are known for finding the bearing of an incoming radio signal. The system disclosed, which enables accurate bearings of radio signals to be obtained rapidly, employs a rosette array of directional Beverage antennas. The antennas are rapidly scanne... | 12/06/1977 |
| 3967280 | Direction finding system with integrated loop and sense antenna assembly An automatic radio direction finding system employing an integrated antenna unit containing both sense and loop antennas in a single compact enclosure. Signal processing circuitries by means of which a low-frequency switching modulation is imposed on one ... | 06/29/1976 |
| 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 |
