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!
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7213442 | Methods of arranging transducers and transducer arrays having reduced phase ambiguity for determining direction of arrival of received signals Method of arranging transducers, including non-coplanar interferometer antennas on the outer surface of an aircraft, to minimize phase ambiguities when determining the direction of arrival of a signal received by an array of the transducers and emitted by a source r... | 05/08/2007 |
| 7096120 | Method and arrangement for guiding a user along a target path An audio-based guide arrangement is provided for guiding a user along a target path by the use of virtual audio beacons. The user's current location is sensed and compared to the target path. Sounds are fed to the user, for example through stereo headphones, to simu... | 08/22/2006 |
| 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 |
| 6275189 | Passive target detection and identification system A passive target positioning system utilizes three stations positioned on a linear baseline with a central master station positioned predetermined distances from two slave stations. Angle to the target is determined from the time differences of arrival at... | 08/14/2001 |
| 5884215 | Method and apparatus for covariance matrix estimation in a weighted least-squares location solution Signals exchanged between a fixed infrastructure (110-116) and a mobile unit (160) give rise to M channel quality metrics. The channel quality metrics are mapped, via predetermined relationships (501-503), in to M corresponding time of arrival variances, ... | 03/16/1999 |
| 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 |
| 5657027 | Two dimensional interferometer array Apparatus and a processing method that determine accurate angle of arrival data indicative of the direction to an emitter. An accurate angle of to the emitter using four antennas and receiver channels (processor). The present invention provides for an amb... | 08/12/1997 |
| 5592181 | Vehicle position tracking technique A method and system for tracking the position of a moving transmitter using angle of arrival measurements from direction finding antenna arrays. Each array includes several elements, with the elements grouped to provide subarrays of different element spac... | 01/07/1997 |
| 5592180 | Direction finding and mobile location system for trunked mobile radio systems A special mobile radio mobile, vehicle or personal location system is described where the system operates to locate any one of a the transmitters in an SMR system. The present invention operates by identifying the received signals, removing the modulation... | 01/07/1997 |
| 5583517 | Multi-path resistant frequency-hopped spread spectrum mobile location system A multi-path resistant frequency-hopped spread spectrum mobile vehicle or personal location system is described which provides low cost manufacture and low power operation while still enabling the accurate location of the mobile unit over long distances a... | 12/10/1996 |
| 4864309 | Microwave radiometer A microwave radiometer is formed of a set of frequency scanning antennas disposed parallel to each other and connected by a common microwave feeder. Signals of individual ones of the antennas are translated to different intermediate frequencies such that ... | 09/05/1989 |
| 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 |
| 4701762 | Three-dimensional electromagnetic surveillance system and method A surveillance system for simultaneously identifying the directions and frequencies of a plurality of electromagnetic-radiation sources includes an irregular array (10) of antenna elements and employs a two-dimensional compressive receiver (14) that recei... | 10/20/1987 |
| 4449192 | Radio wave angle of incidence measurement apparatus This invention relates to a radio wave angle of incidence measurement apparatus which is applicable to radar and other detection systems, and which utilizes an antenna array with radiator elements distributed at a spacing larger than one half of the propa... | 05/15/1984 |
| 4057803 | Adaptive direction of arrival antennae system A system for adaptively determining the direction of arrival (DOA) of a larly polarized RF signal. Three antennae are positioned at fixed distances from one another in a right triangle configuration to receive the RF signal. The antennae are alternatingl... | 11/08/1977 |
| 4023176 | Beacon tracking display system A display system is disclosed for use in connection with a beacon tracking receiver. The display system provides both audible and visual displays for use in locating a source of radio transmission. The display includes an audible tone signal to indicate t... | 05/10/1977 |
| 4001828 | Beacon tracking receiver A radio frequency receiver is responsive to signals radiated by a remote transmitter. The receiver includes at least one pair of antennas separated by approximately one-half wavelength at the transmitter frequency. The phases of the signals detected by th... | 01/04/1977 |
