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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 8098197 | System and method for providing hybrid global positioning system/height of burst antenna operation with optimizied radiation patterns The present invention is a device which includes an antenna and circuitry. The antenna may receive a circularly-polarized signal as first and second linearly-polarized signals. The circuitry is connected to the antenna and is configured for combining the first and s... | 01/17/2012 |
| 7365695 | Antenna system An antenna system for sharing of operation employs contiguous transmit frequencies. Transmit frequencies are separated into non-contiguous sub-groups isolated from one another by filters 158(+) and 160(−) associated with positive and negative polaris... | 04/29/2008 |
| 7304571 | Firefighter locator with activator A device for activating a signal emitter for use in a firefighter locator system operates in conjunction with the firefighter's self-contained breathing apparatus (SCBA). The activation device includes a pressure sensor to monitor pressure on an air line that delive... | 12/04/2007 |
| 7292151 | Human movement measurement system A system for measuring the position of transponders for testing and training a user to manipulate the position of the transponders while being guided by interactive and sensory feedback through a bidirectional communication link to a processing system for the purpos... | 11/06/2007 |
| 7283085 | System and method for efficient, high-resolution microwave imaging using complementary transmit and receive beam patterns A scanning panel for use in a microwave imaging system captures a microwave image of a target using two complementary arrays of antenna elements. Each of the antenna elements in a first array is capable of being programmed with a respective phase delay to direct a t... | 10/16/2007 |
| 7277053 | Apparatus and methods for detecting and locating signals A discrete three-dimensional receiving element has multiple sensors scattered over its surface to detect and locate a signal. The sensors facing the signal detect the signal, and a boundary line is drawn between the sensor which detect the signal and those which don... | 10/02/2007 |
| 7262729 | Radio detection and ranging intrusion detection system A radar system having a processor, a waveform generator, a plurality of antenna interfaces, a set of first antennas configured to transmit a waveform, and a set of second antennas configured to receive a reflected waveform is disclosed. The waveform generator and an... | 08/28/2007 |
| 7257424 | Transceiver method in a radio system and a radio system The invention relates to a radio system and a transceiver method. The method comprises the steps of transmitting a signal of at least one type by a transceiver of the first type; receiving a signal by a transceiver of the second type with at least two differently po... | 08/14/2007 |
| 7221139 | Multi-channel radiometer imaging system A radiometer system includes a housing and an RF board contained within the housing. Balanced radiometer channels receive an unknown signal and known reference. Each balanced radiometer channel includes at least one quadrature hybrid and amplifier circuit to provide... | 05/22/2007 |
| 7199570 | Multi-channel radiometer imaging system A radiometer includes a housing and an RF board carried by the housing. A hybrid and amplifier circuit receives an unknown signal and a known reference signal. A switch receives signals as inputs from the hybrid and amplifier circuit and switches between the inputs.... | 04/03/2007 |
| 7145954 | Method and apparatus for mapping pulses to a non-fixed layout A coding method, specifies temporal and/or non-temporal pulse characteristics, where pulse characteristic values are relative to one or more non-fixed reference characteristic values within at least one delta value range or discrete delta value layout. The method al... | 12/05/2006 |
| 7123187 | Technique for determining relative yaw using phase windup A technique uses “phase windup” to determine relative yaw of a craft from a plurality circularly polarized signals transmitted from one or more transmission sources. A first difference in carrier phase measurements taken simultaneously at time t1 is d... | 10/17/2006 |
| 7106801 | Distance division multiplexing A general method for extracting an electromagnetic or other wave-propagated signal of a desired source from the overall received waveform containing the sum of signals from a multitude of such sources, independently of signal contents and modulation. The method comp... | 09/12/2006 |
| 7091804 | Rotary joint The present invention aims at providing a rotary joint which is of a thin type and has broad band characteristics and which is low in loss and is excellent in power resistance as well. In order to attain the object, the rotary joint includes: first and second polari... | 08/15/2006 |
| 7069050 | Antenna transmission and reception system A transmitter of a base station includes a data serial-to-parallel converter, M modulators, M beam formers, and transmission antennas. The data serial-to-parallel converter converts transmission data into M sequences. Each modulator modulates the transmission data. ... | 06/27/2006 |
| 7053813 | Radar system A radar system determines the range and velocity of a target, such as an atmospheric structure. The radar system transfers a first series of pulses and a second series of pulses. The first series of pulses and the second series of pulses have orthogonal polarization... | 05/30/2006 |
| 7019603 | Waveguide type ortho mode transducer An object of the present invention is to obtain a waveguide type polarizer, which enables miniaturization thereof, shortening of an axis, and broad band promotion, and which has high performance. In order to attain the object, the waveguide type polarizer includes: ... | 03/28/2006 |
| 7001066 | Infrared thermometer and waveguide for infrared thermometer An infrared thermometer comprises a detecting portion provided with a waveguide (8) having a tubular conformation and capable of conveying the infrared radiation emitted from a detecting surface towards a sensor member (7) housed within the infrared-th... | 02/21/2006 |
| 6940465 | Dual-polarized dipole antenna element An improved dual-polarized antenna element arrangement has half-dipole components which interact with each other and, from the electrical point of view, each form of dipole half connected via an electrical connector or a transverse strut, to be precise offset with r... | 09/06/2005 |
| 6583685 | Antenna arrangement A matching circuit for a screen antenna receives on its signal input an MF or LF signal output of a screen antenna and feeds a signal though its signal output via a capacitive feeder to a radio receiver. The matching circuit includes components which oper... | 06/24/2003 |
| 6570536 | Communications system A communications system in which a communications channel is defined at least in part by an electromagnetic wave having a carrier frequency and an electric field vector, the extremity or terminus of which traces a non-linear periodic path at a rotation fr... | 05/27/2003 |
| 6559796 | Method and device for emitting a time signal A satellite provides a time signal that is adjusted for position of a receiver on the surface of the Earth. A receiver determines appropriate local time from the time signal, and can adjust a local clock accordingly, the satellite time signal in the form ... | 05/06/2003 |
| 6441779 | System and method of carrier-phase attitude determination A system and a method for determining a satellite antenna attitude are disclosed. Radio signals from a satellite, such as a GPS satellite, are received by a plurality of coupled antenna elements forming an antenna array. Local attitude values of the anten... | 08/27/2002 |
| 6351237 | Polarization and angular diversity among antenna beams A receiving system 100 is disclosed which includes at least one antenna 101 providing a plurality of antenna beams providing signal diversity between communicated signals. A first processing branch 103 is included for processing a first plurality of signa... | 02/26/2002 |
| 6271790 | Communication system A communications system in which a communications channel is defined at least in part by an electromagnetic wave having a carrier frequency and an electric field vector, the extremity or terminus of which traces a non-linear periodic path at a rotation fr... | 08/07/2001 |
| 6252546 | Method and apparatus for processing multipath reflection effects in timing systems A method and apparatus for processing multipath reflection effects in timing systems is disclosed in which a determination is made of whether a received signal is a reflected signal. A detector provides from an input signal a pair of signals representativ... | 06/26/2001 |
| 6204810 | Communications system A communications system in which a communications channel is defined at least in part by an electromagnetic wave having a carrier frequency and an electric field vector, the extremity of which traces a non-linear periodic path at a second frequency betwee... | 03/20/2001 |
| 6175327 | GPS receivers with adaptive antenna systems for suppressing interference signals GPS receivers are provided that reduce all types of interference signals with a simple receiver structure that includes an antenna system having a reference antenna element and a plurality of auxiliary antenna elements, a plurality of phase shifters and a... | 01/16/2001 |
| 6154173 | Method and apparatus for processing multipath reflection effects in timing systems A method and apparatus for processing multipath reflection effects in timing systems is disclosed in which a determination is made of whether a received signal is a reflected signal. A detector provides from an input signal a pair of signals representativ... | 11/28/2000 |
| 6005514 | Method for attitude determination using GPS carrier phase measurements from nonaligned antennas A correction to a differential phase measurement used for vehicle attitude determination on nonaligned antenna arrays is determined by calculating a carrier phase angle of carrier signals received by each antenna, and correcting the measurement for the ri... | 12/21/1999 |
| 5995044 | Method and apparatus for characterizing multipath interference in circularly polarized signals A GPS receiver embodying the invention includes a first channel that preferentially processes line-of-sight signals and a second channel that preferentially processes multipath signals. It then compares the results to determine if the multipath has degrad... | 11/30/1999 |
| 5982326 | Active micropatch antenna device and array system An active microwave antenna device includes a two-port micropatch antenna which receives signals having a first circular polarization and transmits signals of opposite circular polarization. The device includes an integrated active circuit for amplifying ... | 11/09/1999 |
| 5903238 | Radio station for mobile communication systems and method for the selection of a transmission means In a radio station for mobile communication systems, the reception branches of at least two antenna units having different polarization are monitored in order to acquire statements about the polarization direction of the incident wave. Corresponding to th... | 05/11/1999 |
| 5790076 | Tracking sensor specially for computer applications The multi-dimensional tracking sensor especially for virtual reality and other real time computer applications. The disclosure describes an electro-magnetic (EM) tracking sensor that consists of a small lightweight transmitter with a transmitting antenna ... | 08/04/1998 |
| 5504493 | Active transmit phased array antenna with amplitude taper A phase array transmitting antenna system, including a plurality of radiating elements, each radiating element is capable of transmitting radiation. One or more constant phase and amplitude amplifiers are affixed to the radiating element in the array, whe... | 04/02/1996 |
| 5434575 | Phased array antenna system using polarization phase shifting A circularly polarized phased array antenna system for both reception and transmission applications includes a plurality of planar radiating (or receiving) elements, a switching matrix for each radiating element, a beamforming network and a transmit/recei... | 07/18/1995 |
| 5420597 | Farfield simulator for testing autotrack antennas A simulation device is provided for testing autotrack antennas. The device includes a mode coupler and transmit horn which are identical to the mode coupler and transmit horn of the antenna to be tested. The mode coupler has a plurality of waveguide input... | 05/30/1995 |
| 5317323 | Passive high accuracy geolocation system and method A system for accurately locating a mobile cellular radio includes plural radio receivers, the position of each being precisely known, a satellite-based time source for providing the actual time of arrival of a radio signal at the plural radio receivers, a... | 05/31/1994 |
| 5027123 | Adaptive interference canceller An adaptive interference canceller for use in a dual polarized radar system for receiving cross-polar and like-polar signals and generating an output signal corresponding to the received cross-polar signal with a like-polar interfering component cancelled... | 06/25/1991 |
| 4881077 | Radar arrangement A radar arrangement which is particularly useful for the terrain following radar of an aircraft avoids disturbances from rain echoes by utilizing an antenna arrangement with a transmitting/receving directional antenna which is circularly polarized. A supp... | 11/14/1989 |
