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| Number | Title | Issue Date |
| 8009099 | System and methods for direction finding using a handheld device A system for indicating the relative direction of a target object or location as determined from the current position of a wireless communication device. The system employs Direction of Arrival determination using an antenna array for indicating the direction of a t... | 08/30/2011 |
| 7924225 | Direction finding antenna systems and methods for use thereof An antenna system comprising a first antenna element, a second antenna element, and a parasitic element, wherein the parasitic element is arranged with regard to the first antenna element and the second antenna element such that a greatest difference in gain between... | 04/12/2011 |
| 7357029 | Thermal-acoustic scanning systems and methods Systems and methods for identifying thermal response of a test structure. An example of the system includes a device that generates a excitation beam, a scanning device that scans the thermal excitation beam over a test structure, and a detector that detects acousti... | 04/15/2008 |
| 7352929 | Rotary joint for data and power transfer A rotary joint is disclosed. The rotary joint comprise a power transfer interface for transferring power between a first portion having a first magnetic core and a second portion having a second magnetic core and rotatable relative to the first portion. The rotary j... | 04/01/2008 |
| 7292611 | Demultiplexer for channel interleaving A demultiplexer for channel interleaving in communications systems with multiple carriers and/or transmitter diversity includes a distribution module that distributes data bits in succession to successive transmitter antennas, and a switching module coupled to the d... | 11/06/2007 |
| 7276990 | Single-pole multi-throw switch having low parasitic reactance, and an antenna incorporating the same A switch arrangement comprises a plurality of MEMS switches arranged on a substrate about, and close to, a central point, each MEMS switch being disposed on a common imaginary circle centered on the central point. Additionally, and each MEMS switch is preferably spa... | 10/02/2007 |
| 7265716 | Positioning of mobile wireless terminal An apparatus for determining a position of a mobile wireless station comprises means for determining the position of the mobile wireless station in accordance with a position of a first reference wireless station, a position of a second reference wireless station, a... | 09/04/2007 |
| 7233284 | Handheld GPS jammer locator A handheld GPS jammer locator for locating a GPS jamming signal generated by a jammer. The handheld GPS jammer locator has two modes of operation, a amplitude mode and a difference finding mode. The amplitude measures the strength of an incoming GPS jamming signal a... | 06/19/2007 |
| 7193555 | System and method for detecting emitter signals in the presence of unwanted signals A method for receiving at least one signal emitted by at least one emitter includes defining a first dwell associated with a first signal. The first dwell has a frequency range that overlaps at least a portion of a frequency range of a second signal. The method also... | 03/20/2007 |
| 7117016 | Adaptive antenna base station apparatus An adaptive antenna base station apparatus comprises an array antenna including N (N being a natural number) antenna elements; N reception sections for respectively performing orthogonal detection of high-frequency signals, respectively received by the antenna eleme... | 10/03/2006 |
| 7013166 | Multi-carrier receiver architecture The present invention relates to a receiver device and method of receiving a radio signal, wherein radio signals are received through at least two respective different receiving paths, combined and processed in a common multi-carrier path. In particular, a carrier o... | 03/14/2006 |
| 7012567 | Approach position input device An approach position input device includes a plurality of antennas arranged in the form of a lattice. An oscillator applies a high-frequency ac voltage to the antennas. A signal processing circuit processes signals from the antennas. A change-over switch including s... | 03/14/2006 |
| 6925067 | Configuration of overhead channels in a mixed bandwidth system A method and apparatus for transmitting broadcast information in a multi-carrier communication system. The Sync Channel of the multi-carrier system is transmitted a 1.25 MHz channel bandwidth (i.e., over a single carrier), and to specify the preferred channels for t... | 08/02/2005 |
| 6922450 | Direction of arrival estimator and direction of arrival estimation method An A/D converter converts the signal received by an array antenna and frequency-converted to a digital signal by a frequency converter. A correlation detector uses the chip rate as a cycle frequency and calculates a cyclic correlation matrix of spread spectrum signa... | 07/26/2005 |
| 6768457 | Diversity systems for receiving digital terrestrial and/or satellite radio signals for motor vehicles The invention relates to a diversity reception system for motor vehicles for digitally modulated terrestrial and/or satellite radio signals in a frequency range above 1 GHz. The system includes an antenna arrangement which supplies the reception signal to a radio re... | 07/27/2004 |
| 6738609 | Receiver and method of receiving A receiver (9) for receiving a plurality of different signals at the same time, said receiver (9) comprising means for identifying at least one strongest signal of said plurality of different signals and means for attenuating said at least one stronges... | 05/18/2004 |
| 5696490 | FM (VHF) infrared wireless digital metal detector A FM (VHF) infrared wireless digital metal detector is disclosed having a sealed aluminum radiation shield and dielectric case, with a infrared phototransistor detector and krypton bulb arranged to relay detection data to meter within a clustered instrume... | 12/09/1997 |
| 5502449 | Ground unit for the detection, identification, and direction determination of a marker beacon A ground unit capable of being carried on the back of a member of the armed orces is used in conjunction with a marker beacon. The ground unit detects and identifies the signals from the marker beacon and is also capable of indicating the direction in whic... | 03/26/1996 |
| 5426438 | Method and apparatus for adaptively determining the bearing angle of a radio frequency signal A system and method for obtaining the bearing angle of radio frequency is utilized in a direction finding system to determine the signal of interest. The system utilized an adaptive interferometric processor to null out modulation occurring due to commuta... | 06/20/1995 |
| 5323167 | Antenna configuration and system for determining the direction of a radio frequency signal An antenna configuration system for determining the bearing angle of a radio frequency signal includes a plurality of loop antennas and at least one sense antenna. Through the utilization of combining networks with the loop antennas, in-phase and out-of-p... | 06/21/1994 |
| 5268695 | Differential phase measurement through antenna multiplexing An embodiment of the present invention is a system for time multiplexing a carrier signal received by two or more GPS antennas through a single hardware path, using a single receiver's oscillator in that hardware path as a reference to compare the phase f... | 12/07/1993 |
| 5265271 | Low battery detector An electronic device (100) operating on a battery voltage (126) is disclosed having a regulator (108) for producing a first reference voltage (106) and a second reference voltage (110). The electronic device (100) includes an A/D converter (114) for compa... | 11/23/1993 |
| 5264857 | Method and apparatus for signal modulation and detection The disclosure relates to methods and apparatus for separating radio signals arriving from different directions and for multiplexing signals intended for receivers dispersed in different directions. The methods and apparatus employ a plurality of antennas... | 11/23/1993 |
| 5198823 | Passive secondary surveillance radar using signals of remote SSR and multiple antennas switched in synchronism with rotation of SSR beam The range from which transponder replies can be received at a virtual secondary surveillance radar of the type described in U.S. Pat. No. 4,115,771 is extended by replacing the omnidirectional antenna previously utilized to receive replies from transponde... | 03/30/1993 |
| 5075695 | Method and apparatus for signal modulation and detection The disclosure relates to methods and apparatus for separating radio signals arriving from different directions and for multiplexing signals intended for receivers dispersed in different directions. The methods and apparatus employ a plurality of antennas... | 12/24/1991 |
| 5010343 | Method and device in the antenna and receiving system of a radio theodolite Method and device in the antenna and receiving system of a radio theodolite, wherein the radio signal arriving from the transmitter of the object (31) to be measured is received by means of at least three antennas (1 . . . n-1) in the antenna field (AK) a... | 04/23/1991 |
| 4978963 | RF signal direction finding apparatus Angle of arrival of a pulsed RF signal, such as that emitted by a radar transmitter, is determined by use of a detection circuit that contains a single RF receiver. The RF signal direction of arrival determining system contains a switching means to automa... | 12/18/1990 |
| 4975710 | Methods and apparatus for direction of arrival measurement and radio navigation aids The disclosure relates to methods, algorithms and apparatus for direction-of arrival (DOA) measurement/computation based on long-baseline, phase-difference, paired-antenna interferometry and on DOA-computing array processing algorithms. Specifically, meth... | 12/04/1990 |
| 4920348 | Method and apparatus for signal modulation and detection The disclosure relates to methods and apparatus for separating radio signals arriving from different directions and for multiplexing signals intended for receivers dispersed in different directions. The methods and apparatus employ a plurality of antennas... | 04/24/1990 |
| 4647935 | Apparatus for determining the magnitude of phase discontinuities introduced into a received signal at known instants An apparatus for tracking phase discontinuities introduced into a received signal at known instants is disclosed. The phase discontinuities are introduced into the received signal by command signals derived from a system timing reference. A controlled osc... | 03/03/1987 |
| 4529986 | Optical connection system for the bidirectional exchange of data between a central unit and peripheral units and an electronic sweep antenna comprising such a system A system for connection by means of optical fibers for the bidirectional exchange of data between a fixed central unit and peripheral units integral with a frame driven with a rotary movement, this system comprising radiating energy emitting and receiving... | 07/16/1985 |
| 4489327 | Direction finding A direction finding system has two antennas with response patterns at 90°. A sense antenna 14 is mounted to produce a sense output dependent on the received radio signal but independent of its bearing. A commutating and combining arrangement receives the... | 12/18/1984 |
| 4358768 | Radio direction finder A radio direction finder for obtaining the bearing of a transmitter with respect to a receiver comprises a multi-element receiving antenna, two separate scanning means coupled to said antenna for simultaneously generating a rightward and a leftward rotati... | 11/09/1982 |
| 4307402 | Direction finder A direction finder having two directive loop antennas mutually orthogonally disposed and a non-directional vertical antenna. Due to the difference in line constant between the loop antenna channels and the vertical antenna channel, the voltage signals ind... | 12/22/1981 |
| 4246581 | Direction finder An improved direction finding apparatus for determining the azimuth of a target source of radio frequency signals using in an optimal manner the signals from a central antenna and an associated array of direction finding antennas. The signals of the anten... | 01/20/1981 |
| 4220954 | Adaptive antenna system employing FM receiver In an adaptive antenna system, the output of the discriminator of an FM receiver is synchronously rectified, in synchronism with commutation of the input thereof between a pair of antennas, to provide an output signal. When the inputs of the receiver are ... | 09/02/1980 |
| 4129874 | Antenna pattern combiner A three input device which accepts signals from a two port antenna system having opposing cardioid patterns, and a third input for a figure eight pattern that is at right angles to the first cardioids. The first antennas cardioids are combined by a zero-p... | 12/12/1978 |
| 4123759 | Phased array antenna An antenna system for producing from a fixed array of active antenna elements which are each omnidirectional in a plane, a sensitivity pattern that is directional in said plane and which pattern can be rotated around the array. The system consists of at l... | 10/31/1978 |
| 4107691 | Antenna for phase front homing A VHF radio frequency antenna for a homing receiver suited for airborne aications and comprising a pair of right angled antenna elements of like configuration terminating in a common non-conductive joint of insulator material while their opposite ends te... | 08/15/1978 |
| 4071845 | Harbor radio navigation system A radio beacon navigation system wherein buoys placed at predetermined locations in a harbor or channel transmit identification signals. Every buoy is assigned a unique carrier frequency upon which is transmitted a signal capable of identifying the buoy. ... | 01/31/1978 |
