Receiver Only Patents (Class 342/362)
  • Patent number: 10412685
    Abstract: Various aspects of the disclosure relate to controlling the transmit power of a satellite by controlling a duty cycle associated with satellite transmission. In some implementations, a satellite network portal (SNP) may send waveforms to a satellite that relays the waveforms to user terminals (UTs). The SNP may control the duty cycle of the waveform transmission (e.g., by transmitting on a subset of a subframe) to thereby control an average transmission power of the satellite when the satellite transmits to the UTs. In some implementations, a satellite or UT may control the duty cycle of transmission by the satellite (e.g., by transmitting on a subset of a subframe) to thereby control an average transmission power of the satellite when the satellite transmits.
    Type: Grant
    Filed: May 4, 2016
    Date of Patent: September 10, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Mario Mark Scipione, Gene Wesley Marsh, Dan Vassilovski
  • Patent number: 10345431
    Abstract: A dual polarized radar system transmits a waveform having energy polarized in a direction to permit the waveform to be separately received by orthogonally positioned waveguides. Specifically, receivers are able to separately measure a vertically polarized component of the returns and a horizontally polarized component of the returns without requiring the transmitter to divide the transmit signal across polarization angles. Thus, components for dividing the transmit signal and calibrating the system to account for inaccuracies resulting from such division can be eliminated, thereby reducing the complexity and cost of the radar system.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: July 9, 2019
    Assignee: Baron Services, Inc.
    Inventor: James H. Romines
  • Patent number: 10320085
    Abstract: A high efficiency short backfire antenna (SBFA) includes a cylindrical reflector and a feed structure. The conductive cylindrical reflector is configured to collect or to radiate electromagnetic waves. The cylindrical reflector has a reflector base and a reflector wall. The feed structure is electromagnetically coupled to the cylindrical reflector. The reflector wall includes a dielectric liner formed on an inside surface of the cylindrical reflector, and the dielectric liner is covered with a structured anisotropic impedance surface.
    Type: Grant
    Filed: May 18, 2015
    Date of Patent: June 11, 2019
    Assignee: Lockheed Martin Corporation
    Inventors: Erik Lier, Matthew George Bray, Thomas Henry Hand, Bonnie Gean Martin
  • Patent number: 10218076
    Abstract: A circularly polarized horn antenna can comprise a rectangular waveguide, a hexagonal waveguide connected to the rectangular waveguide, a first transition part connected to the hexagonal waveguide, and a horn connected to the first transition part. The horn can include a first corrugated inner surface, and the first transition part can include a second corrugated inner surface.
    Type: Grant
    Filed: September 10, 2018
    Date of Patent: February 26, 2019
    Assignee: The Florida International University Board of Trustees
    Inventors: Shubhendu Bhardwaj, John Volakis
  • Patent number: 10158395
    Abstract: A wireless system allows for selectively using, and communicating through, wireless propagation paths between radio devices in an over-the-horizen communication environment. Also an elevator control system and a substation monitoring system using the same are provided.
    Type: Grant
    Filed: November 20, 2017
    Date of Patent: December 18, 2018
    Assignee: Hitachi, Ltd.
    Inventor: Ken Takei
  • Patent number: 10142096
    Abstract: A wireless receiver includes an antenna panel coupled to an H-combined/V-combined generation block, an axial ratio and cross-polarization calibration block to correct for an undesired variation in H-combined and V-combined outputs, and an LHCP/RHCP generation block to produce left-handed circularly polarized (LHCP) and right-handed circularly polarized (RHCP) outputs. The axial ratio and cross-polarization calibration block generates an H-corrected output by summing the H-combined output amplified by a first variable gain amplifier and the V-combined output amplified by a second variable gain amplifier, and a V-corrected output by summing the V-combined output amplified by a third variable gain amplifier and the H-combined output amplified by a fourth variable gain amplifier.
    Type: Grant
    Filed: October 4, 2017
    Date of Patent: November 27, 2018
    Assignee: MOVANDI CORPORATION
    Inventors: Farid Shirinfar, Sam Gharavi, Michael Boers, Seunghwan Yoon, Alfred Grau Besoli, Maryam Rofougaran, Ahmadreza Rofougaran
  • Patent number: 10090585
    Abstract: Circuits and methods for antenna-based self-interference cancellation are provided. In some embodiments, circuits for antenna-based self-interference cancellation are provided, the circuits comprising: a transmit antenna having a transmit port that receives a transmit signal; a receive antenna having a receive port that is cross-polarized with respect to the transmit port and having an auxiliary port that is co-polarized with respect to the transmit port; and a termination connected to the auxiliary port that reflects a signal received at the auxiliary port as a reflected signal, wherein the reflected signal counters interference caused by the transmit signal at the receive port.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: October 2, 2018
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Tolga Dinc, Harish Krishnaswamy
  • Patent number: 9923712
    Abstract: A wireless receiver includes an antenna panel coupled to an H-combined/V-combined generation block, an axial ratio and cross-polarization calibration block to correct for an undesired variation in H-combined and V-combined outputs, and an LHCP/RHCP generation block to produce left-handed circularly polarized (LHCP) and right-handed circularly polarized (RHCP) outputs. The axial ratio and cross-polarization calibration block generates an H-corrected output by summing the H-combined output amplified by a first variable gain amplifier and the V-combined output amplified by a second variable gain amplifier, and a V-corrected output by summing the V-combined output amplified by a third variable gain amplifier and the H-combined output amplified by a fourth variable gain amplifier.
    Type: Grant
    Filed: August 1, 2016
    Date of Patent: March 20, 2018
    Assignee: Movandi Corporation
    Inventors: Farid Shirinfar, Sam Gharavi, Michael Boers, Seunghwan Yoon, Alfred Grau Besoli, Maryam Rofougaran, Ahmadreza Rofougaran
  • Patent number: 9660716
    Abstract: According to various embodiments, systems and methods are provided for improving signal quality and signal reliability over wireless communication using polarization diversity. Some embodiments use polarization diversity on a wireless channel to address and compensate for fading conditions such as non-frequency selective fading (also referred to as power fading, attenuation fading, and flat fading) and frequency selective fading (also referred to as multipath fading and dispersive fading). For example, some embodiments utilize a horizontal signal and a vertical signal on the same wireless channel when wirelessly communicating data between a transmitter and a receiver to address a fading condition.
    Type: Grant
    Filed: April 6, 2016
    Date of Patent: May 23, 2017
    Assignee: Aviat U.S., Inc.
    Inventors: Youming Qin, Frank Matsumoto
  • Patent number: 9625575
    Abstract: A distance measuring apparatus and method for calculating a distance in a conducting structure are provided. One distance measuring apparatus provides for calculating a distance between a reflection body in a conducting structure and an injection point provided on an end section of the conducting structure for electromagnetic waves is provided. The distance measuring apparatus includes a transmitting and receiving device with a conduction cross-over provided at the injection point for the coaxially-inductive coupling of the transmitting and receiving device to the conducting structure in order to inject an electromagnetic wave into the conducting structure and to decouple the electromagnetic wave reflected on the reflection body from the conducting structure. The distance measuring apparatus also includes an analysis device for calculating a distance between the injection point and the reflection body from the phase difference between the injected electromagnetic wave and the decoupled electromagnetic wave.
    Type: Grant
    Filed: February 22, 2016
    Date of Patent: April 18, 2017
    Assignee: ASTYX GmbH
    Inventors: Guenther Trummer, Ralf Gehring
  • Patent number: 9571183
    Abstract: The described technology uses a dual circularly polarized panel antenna and equal amplitude variable phase control between the two circularly polarized components to achieve a rotatable linear polarization tracking system. An example antenna system includes a plurality of antenna elements that include a plurality of polarization transducers to generate a first signal component and a second signal component from a received wave. A polarization control network applies a phase difference based on an orientation of the linear polarization of the wave with respect to the antenna system between the signal components to generate adjusted signal components. The polarization control network combines the adjusted signal components to form a composite signal that corresponds to the linear polarization of the wave. Linearly polarized transmit and receive signals may be co-polarized or cross-polarized.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: February 14, 2017
    Assignee: ViaSat, Inc.
    Inventors: Donald L. Runyon, Sharad V. Parekh
  • Patent number: 9519062
    Abstract: Methods, systems, and computer readable media for mitigation of interference of GPS signals are disclosed providing selective mitigation of in-band interference implementing deterministic phase control. In one embodiment, a system for mitigating interference of GPS signals includes a pair of antennas, each receiving GPS signals that include both a desired signal component and a jammer signal component. The signal from one antenna is phase-shifted as needed to make it anti-phase with the signal from the other antenna, so that when the two signals are combined, the jammer signal components substantially cancel each other, leaving the desired signal components. Determining the phase shift required involves deterministically calculating the phase shift based on the amplitudes of the two input signals and the amplitude of the combined signal instead of the iterative techniques used in conventional systems.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: December 13, 2016
    Assignee: Physical Devices, LLC
    Inventors: Frederick Vosburgh, Charley Theodore Wilson, III
  • Patent number: 9516064
    Abstract: One or more relevant scanners used to identify asset vulnerabilities are identified, obtained, and logically arranged for deployment on an asset in accordance with a vulnerability management policy and a scanner deployment policy such that the relevant scanners are deployed at, or before, a determined ideal time to minimize the resources necessary to correct the vulnerabilities, if found. The relevant scanners are then automatically deployed in accordance with the scanner deployment policy and, if a vulnerability is identified, one or more associated remedies or remedy procedures are applied to the asset. At least one of the one or more relevant scanners are then re-deployed on the asset to determine if the identified vulnerability has been corrected and, if the vulnerability is not corrected at, or before, a defined time, protective measures are automatically taken.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: December 6, 2016
    Assignee: Intuit Inc.
    Inventors: M. Shannon Lietz, Luis Felipe Cabrera, Barry J. Nisly, Ted R. Neher, III, Javier Godinez, Ankur Jain
  • Patent number: 9450785
    Abstract: A system that incorporates the subject disclosure may include, for example, determining an interference based on a channel gain for each signal of a group of signals received at a receiver from a group of transmitters. A determination is made as to whether the interference satisfies a threshold range of an analog-to-digital converter of the receiver for each of the group of transmitters. An analog time domain cancellation is performed responsive to a determination that the interference does not satisfy the threshold range, and a digital time domain cancellation is performed responsive to a determination that the interference satisfies the threshold range. Other embodiments are disclosed.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: September 20, 2016
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Vaneet Aggarwal, Dinesh Bharadia, Rittwik Jana, Christopher W. Rice, Nemmara K. Shankaranarayanan
  • Patent number: 9419711
    Abstract: One measurement system comprises a polarimeter with a polarimeter detector bandwidth that partially overlaps with a signal bandwidth or completely overlaps with a signal bandwidth. The polarimeter measures a state of polarization (SOP) or a degree of polarization (DOP) of the signal in the presence of noise. The system further comprises a sampler that receives polarimeter signals from the polarimeter and samples those received signals at a specified sampling rate. The sampler outputs sampled data to a processor that calculates a mean DOP for the samples. Subsequently, the OSNR is determined from the calculated mean DOP.
    Type: Grant
    Filed: September 17, 2013
    Date of Patent: August 16, 2016
    Assignee: OFS FITEL, LLC
    Inventors: Vitaly Mikhailov, Paul S Westbrook
  • Patent number: 9385803
    Abstract: An air to ground (ATG) broadband access system is described. The system includes: a plurality of cell sites that together form a service coverage area, each cell site adapted to generate a local coverage area, each sell site including: multiple antenna fixtures situated at a lower corner of the local coverage area, where the local coverage area includes multiple sectors and each antenna fixture is associated with a different sector than each other antenna fixture; and a radio sub-system connected to each antenna fixture, the radio sub-system including a transmitter capable of modulating and transmitting signals through the antenna fixture and a receiver capable of demodulating and decoding signals received through the antenna fixture; and at least one aerial platform including: at least one antenna fixture capable of forming beams toward the cell site; and a radio sub-system capable of modulating and transmitting signals and demodulating and decoding signals.
    Type: Grant
    Filed: March 28, 2014
    Date of Patent: July 5, 2016
    Assignee: UBiQOMM, INC.
    Inventor: Ahmad Jalali
  • Patent number: 9369881
    Abstract: Methods and systems are provided for dynamically changing an orientation of dipole elements on an antenna associated with a wireless communications network. A reference signal is received at a base station from a user device that indicates an angle of arrival corresponding to the user device. Based on the angle of arrival and other factors, it is determined that a first pair of dipole elements having a first orientation is to be moved to have a second orientation. By way of a motorized element, first pair of dipole elements is physically moved from the first orientation to the second orientation.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: June 14, 2016
    Assignee: Sprint Communications Company L.P.
    Inventors: Chaitanya Chukka, Andrew M. Wurtenberger
  • Patent number: 9348009
    Abstract: An electromagnetic emission device for helmet position detection systems includes an electromagnetic emitter and control electronics, the emitter comprising three windings arranged perpendicularly, the processing electronics comprising three electronic chains each associated to a given winding and working simultaneously. Each electronic chain comprises closed-loop control means arranged such that the related signal generated comprises three analogue components: a first component, being the stimulus component, modulated at an “emission” frequency of the winding, each of the three emission frequencies being different from one winding to the next, and a second and a third component, referred to as correction components, modulated at an emission frequency of another winding, the phase and amplitude of which are calculated such as to compensate the parasitic signals received by said winding from the other two windings.
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: May 24, 2016
    Assignee: Thales
    Inventor: Yves Sontag
  • Patent number: 9231712
    Abstract: Signals propagating from an aggressor communication channel can cause detrimental interference in a victim communication channel. One or more noise cancellers can generate an interference compensation signal to suppress or cancel the interference based on one or more settings. A controller can execute algorithms to find preferred settings for the noise canceller(s). The controller can use a feedback signal (e.g., receive signal quality indicator) received from a victim receiver during the execution of the algorithm(s) to find the preferred settings. One exemplary algorithm includes sequentially evaluating the feedback resulting from a predetermined list of settings. Another algorithm includes determining whether to move from one setting to the next based on the feedback values for both settings. Yet another algorithm includes evaluating a number of sample settings to determine which of the sample settings result in a better feedback value and searching around that sample setting for a preferred setting.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: January 5, 2016
    Assignee: Intersil Americas Inc.
    Inventors: Wilhelm Steffen Hahn, Wei Chen
  • Patent number: 9191050
    Abstract: Aspects of the disclosure are directed to interference cancellation and wireless communication including determining the strength of a reference signal; comparing the strength of the reference signal to a first threshold and a second threshold; and performing one of the following: updating at least one coefficient if the strength of the reference signal is above the first threshold; freezing the at least one coefficient if the strength of the reference signal is between the first threshold and the second threshold; or setting an interference cancelation (IC) circuit to OFF if the strength of the reference signal is below both the first threshold and the second threshold.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: November 17, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Insoo Hwang, Bongyong Song, Cong Nguyen, Peter David Heidmann, Samir Salib Soliman
  • Patent number: 9160389
    Abstract: A hybrid combining method in a receiver is provided, and the method includes that wideband combining, e.g. using a maximum ratio combining (MRC) or an interference rejection combing (IRC) process, to combine signals distributed over a first plurality of subcarrier frequencies from antennas in the same polarization direction is performed, resulting in a combined signal for each polarization direction that is distributed over a smaller number of subcarrier frequencies, then a two-port narrowband IRC is done of these wideband combined signals for the two polarization directions, resulting in a diversity combined signal.
    Type: Grant
    Filed: October 19, 2011
    Date of Patent: October 13, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Zhiheng Guo, Hai Wang, Ruiqi Zhang
  • Patent number: 9118116
    Abstract: A cylindrically symmetric satellite antenna that provides directional and omnidirectional operating modes in a compact form factor. Feed points located at the top of the cylindrical structure provide increased platform isolation. Combining networks, disposed below or within the cylindrical structure, may be replaced with inexpensive baluns composed of coaxial line sections.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: August 25, 2015
    Assignee: AMI Research & Development, LLC
    Inventors: John T. Apostolos, William Mouyos, Brian Molen, Benjamin McMahon
  • Patent number: 9094115
    Abstract: An antenna system and method utilize a splitter electrically connectable to a single antenna for splitting an RF signal into two signals. A variable phase shifter shifts the phase of one of the signals. A combiner combines the phase shifted and non-phase shifted signals to produce a conditioned signal. A quality examiner circuit changes the amount of phase shift provided by the variable phase shifter to produce a plurality of different conditioned signals. The quality examiner circuit then determines a quality of each conditioned signal and changes the phase shift again to provide the highest quality conditioned signal to a receiver.
    Type: Grant
    Filed: July 2, 2013
    Date of Patent: July 28, 2015
    Assignee: AGC AUTOMOTIVE AMERICAS R&D, INC.
    Inventors: Ming Lee, Wladimiro Villarroel, Yasutaka Horiki, Kwan-ho Lee
  • Patent number: 9059508
    Abstract: A system and methods for co-site and multi-path interference mitigation are presented. A reflection signal is received from at least one aircraft surface at a sensor near a receiver antenna, and a conformal reflective phased array antenna coupled to at least one aircraft surface is configured to steer the reflection signal. The reflection signal is steered using the conformal reflective phased array antenna to reduce an amplitude of the reflection signal at the receiver antenna based on the reflection signal received at the sensor.
    Type: Grant
    Filed: October 9, 2012
    Date of Patent: June 16, 2015
    Assignee: THE BOEING COMPANY
    Inventors: Robert T. Worl, Gary A. Ray, Mark A. Curry
  • Publication number: 20140266888
    Abstract: An electromagnetic vector sensor (EMVS) system, having a plurality of EMVS devices consisting of a plurality of loop antenna elements spatiatally orthogonally integrated with and electrically isolated from a plurality of dipole antenna elements, mounted on a rotatably adjustable platform having a true north orientation, including active circuitry residing in antenna housings, and external executing software programs causing the active circuitry in cooperation with the EMVS device and receivers to determine angle of arrival and resolution of incoming wave vectors and polarization of incoming signals and to perform accurate high frequency geolocation signal processing; the programs which perform calibration and antenna element placement determination operations, also cause the system to collect data of known transmitted high frequency skywave signals, and estimate direction of arrival of unknown signals by detecting, resolving and measuring components of an electric field and a magnetic field at a single point.
    Type: Application
    Filed: September 8, 2013
    Publication date: September 18, 2014
    Applicant: US Gov't Represented by Secretary of the Navy Chief of Naval Research Office of Counsel ONR/NRL
    Inventor: Mark G. Parent
  • Patent number: 8744031
    Abstract: Provided are a device and method for estimating carrier frequency offset of OFDM signals transmitted and received through a plurality of polarized antennas that may accurately estimate carrier frequency offset used for carrier frequency synchronization acquisition when there is interference between polarized waves.
    Type: Grant
    Filed: August 13, 2013
    Date of Patent: June 3, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jun-Woo Kim, Young-Jo Bang, Kyung-Yeol Sohn, Se-Young Cho, Youn-Ok Park
  • Publication number: 20140132448
    Abstract: A high gain antenna for direction finding in the Ka-band. The antenna consists of a lens antenna fed by two micro strip patch antennas. The printed patch antennas are fed by a 180 degree hybrid coupler having four ports, with two ports connected to the feeds of the patch antennas and the other two ports connected to the receiver/exciter. The hybrid sums the signals from the patches and subtracts the signals from the patches to form sum and difference channels. By comparing the sum and difference channels, a user can determine whether the signal entered through the main beam. For example, if the sum signal is greater than the difference signal, the signal is in the main beam. If not, the signal came from another angle.
    Type: Application
    Filed: November 9, 2012
    Publication date: May 15, 2014
    Applicant: SRC, INC.
    Inventor: Lance Bradstreet
  • Publication number: 20120199690
    Abstract: A method for onboard determination of a roll angle of a projectile.
    Type: Application
    Filed: November 22, 2009
    Publication date: August 9, 2012
    Applicant: OMNITEK PARTNERS LLC
    Inventors: Jahangir S. Rastegar, Carlos M. Pereira
  • Patent number: 8228232
    Abstract: In an exemplary embodiment, a phased array solid-state architecture has dual-polarized feeds and is manufactured, for example, on highly flexible silicon germanium (SiGe). The implementation of dual-polarized feeds facilitates the operation of phased arrays where the polarization can be statically or dynamically controlled on a subarray or element basis. In an exemplary embodiment, the sub-component control is configured to optimize a performance characteristic associated with polarization, such as phase or amplitude adjustment. An active phased array architecture may replace traditional distributed and GaAs implementations for the necessary functions required to operate electronically steerable phased array antennas.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: July 24, 2012
    Assignee: ViaSat, Inc.
    Inventors: David W. Corman, Kenneth V. Buer, Donald Lawson Runyon, Stefano Vacarro, Ferdinando Tiezzi, Daniel Llorens del Rio, Donald E. Crockett
  • Patent number: 8103301
    Abstract: A wireless device configured to support a wireless networking protocol may utilize signal processing techniques that can mitigate the effects of jammer signals. For example, when a measured power associated with a digital sample of a received wireless signal is greater than a threshold, the wireless device may determine if the wireless signal corresponds to a wireless networking packet to be demodulated. If the wireless signal does not correspond to a wireless networking packet to be demodulated, the wireless device may adjust the threshold so that the power associated with the digital sample is less than the threshold. In other words, if the signal is a jammer signal, the wireless device may adjust its noise floor upward so that continuous reception of the same jammer signal does not trigger demodulation a second time.
    Type: Grant
    Filed: April 11, 2003
    Date of Patent: January 24, 2012
    Assignee: QUALCOMM, Incorporated
    Inventors: Daniel F. Filipovic, Clark Korb
  • Publication number: 20120013500
    Abstract: Method of automatic target angle tracking by sum-and-difference monopulse radar covers radiolocation sphere and specifically monopulse direction finding systems. It can be used in order to increase guidance accuracy, for example, for anti aircraft missiles and of unmanned aerial vehicles to radar targets such as: radio beacons; aerial vehicles reflecting the radio signal that illuminates them; aerial vehicles and ground-based devices radiating radio signals and jamming signals. The aim of the method consists in the assurance of reliability and stability and in the enhancement of guidance accuracy of automatic target angle tracking due to elimination of automatic tracking losses and great errors arising during the influence of the signals of orthogonal polarization or polarization close to it. The proposed method provides full protection from polarization jamming for all types of monopulse radars.
    Type: Application
    Filed: July 15, 2010
    Publication date: January 19, 2012
    Inventor: Evgeny Markin
  • Patent number: 7969357
    Abstract: This invention concerns a system (1) for electronically aligning the polarisation of an antenna (2;2b) with the polarisation of a signal received therein or transmitted therefrom, said signal having two mutually orthogonal components, namely a vertical component (Cv) and a horizontal component (Co).
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: June 28, 2011
    Assignee: Space Engineering SpA
    Inventors: Pasquale Russo, Alfredo Catalani, Franco Di Paolo, Marzia Migliorelli
  • Publication number: 20110133986
    Abstract: A directional multiple-polarization wide band antenna array working in a selected frequency band and including a plurality of N individual sensors of convoluted spiral type complementing a number of strands arranged according to a structure making it possible to obtain for obtaining a given azimuth coverage, each of the N sensors including a reflecting plane attached to the antenna by an insulating spacer E, matching cells suited to the working frequency band of said array, and separate output channels (5) and (7) for the vertically-polarized signals and for the horizontally-polarized signals. The antenna array also including a device suitable for executing a direction-finding algorithm that uses the amplitude and the phase of said signals and is matched to the configuration of the array.
    Type: Application
    Filed: December 19, 2008
    Publication date: June 9, 2011
    Inventors: Anthony Bellion, Cyrille Le Meins
  • Patent number: 7839314
    Abstract: In a satellite radio navigation receiver receiving a transmitted radio navigation signal, a method of removing I/Q-mismatches in the received signal, comprising: resolving the received signal into I and Q signal component, and providing them as inputs to a demixing stage which removes unwanted signals, the demixing stage including first and second cross-coupled adaptive filters, whose coefficients are updated by the outputs of the demixing stage, the outputs of the demixing stage representing an IQ mismatch corrected signal. The coefficients are updated only by the polarity values of the outputs, resulting in great simplification. The receiver may be a zero-IF or low-IF receiver, and may operate on time domain or frequency domain signals.
    Type: Grant
    Filed: February 14, 2007
    Date of Patent: November 23, 2010
    Assignee: University of Westminster
    Inventors: Ediz Cetin, Izzet Kale, Richard Charles Spicer Morling, Andrew Graham Dempster
  • Patent number: 7797105
    Abstract: A system and method for GPS acquisition in relatively high interference is described. Acquisition is aided by an Advanced Tightly Coupled (ATC) tracking filters that compute a satellite range residuals and range rate residuals for satellites being acquired. Multiple channels are used in parallel to search for the desired satellites. Range residuals from the ATC filters are used to correct the computed receiver offset and thus allow acquisition in the presence of relatively high interference.
    Type: Grant
    Filed: August 18, 2008
    Date of Patent: September 14, 2010
    Assignee: L-3 Communications Corporation
    Inventor: Steven B. Alexander
  • Publication number: 20100164801
    Abstract: Provided is a device for tracking polarizations. A receiving polarization tracking device includes a feeder for finding vertical and horizontal vector components by receiving vertical and horizontal polarizations, a polarization estimator for estimating distortion of polarizations using the vertical and horizontal vector components outputted from the feeder, a polarization controller for controlling amplitudes and phases of vertical and horizontal polarizations based on information about the estimated distortion from the polarization estimator and an output signal from the receiving polarization tracking device, and a combiner for combining the vertical and horizontal polarizations controlled from the polarization controller.
    Type: Application
    Filed: May 8, 2008
    Publication date: July 1, 2010
    Inventors: Bon-Jun Ku, Do-Seob Ahn, Ho-Jin Lee
  • Patent number: 7596354
    Abstract: A mechanism that enables a gateway to dynamically determine which of two transmission signal polarizations is best received by a wireless communication device having a nominally linear antenna. A first pilot and second pilot signals, having different polarizations and orthogonally encoded, are transmitted to the communication device. The communication device determines the relative or absolute signal strengths of the first and second pilot signals and transmits this information to the gateway. The gateway then selects the polarization having the strongest associated signal strength to transmit content-bearing signals to the communication device. Alternatively, the communication device may also determine the phase difference between the first and second pilot signals and transmit this information to the gateway.
    Type: Grant
    Filed: December 12, 2005
    Date of Patent: September 29, 2009
    Assignee: Qualcomm, Inc.
    Inventor: Leonard Norman Schiff
  • Patent number: 7551134
    Abstract: Methods and systems for tracking signals with diverse polarization properties address both sensitivity and antenna tracking performance issues. In one embodiment, complex weightings for matching a polarization of an incident signal on a data channel are determined, and the complex weightings are applied to a tracking channel such that an antenna system polarization is matched to the polarization of the incident signal. In another embodiment, orthogonally polarized tracking channel components of an incident signal are processed to make a determination as to which of the orthogonally polarized tracking channel components is stronger, and this determination is used to select a polarization of a data channel to reduce a polarization mismatch loss.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: June 23, 2009
    Assignee: The Aerospace Corporation
    Inventors: Robert B. Dybdal, Denny D. Pidhayny
  • Patent number: 7518551
    Abstract: Methods and systems for tracking signals with diverse polarization properties address both sensitivity and antenna tracking performance issues. In one embodiment, complex weightings for matching a polarization of an incident signal on a data channel are determined, and the complex weightings are applied to a tracking channel such that an antenna system polarization is matched to the polarization of the incident signal. In another embodiment, orthogonally polarized tracking channel components of an incident signal are processed to make a determination as to which of the orthogonally polarized tracking channel components is stronger, and this determination is used to select a polarization of a data channel to reduce a polarization mismatch loss.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: April 14, 2009
    Assignee: The Aerospace Corporation
    Inventors: Robert B. Dybdal, Denny D. Pidhayny
  • Patent number: 7493143
    Abstract: According to a disclosed embodiment, a first plurality of pilot signals of a first polarization is received and ranked. Subsequently, a second plurality of pilot signals of a second polarization is received and ranked. Following, a pilot signal from the first and second pluralities of pilot signals is selected based on a signal quality measurement such as a signal to interference ratio. Moreover, a system can be constructed comprising antennas configured to receive pilot signals of a first and a second polarization. The system further comprises a receiver configured to demodulate the pilot signals and a CPU configured to rank the pilot signals and to select a pilot signal based on a signal quality measurement. Communication quality is improved by communicating with the base transceiver station transmitting the pilot signal providing the highest signal quality measurement.
    Type: Grant
    Filed: May 7, 2001
    Date of Patent: February 17, 2009
    Assignee: QUALCOMM Incorporated
    Inventor: Ahmad Jalali
  • Patent number: 7414582
    Abstract: Embodiments of the present invention provide a method and apparatus for all-polarization direction finding. The method and apparatus generally include acquiring measurements at least partially corresponding to an emitted signal and generated utilizing a blind signal extraction algorithm, forming an all-polarization cost function utilizing the acquired measurements, and determining an angle of arrival for the emitted signal utilizing the formed all-polarization cost function. Such a configuration enables angles of arrivals to be easily determined for signals having any polarization without using a multiple signal classification (MUSIC) algorithm.
    Type: Grant
    Filed: March 3, 2006
    Date of Patent: August 19, 2008
    Assignee: L-3 Communications Integrated Systems L.P.
    Inventors: Steven D. Thornton, Dennis J. Close, Mark L. Kargel, Steven P. Stanners
  • Patent number: 7412175
    Abstract: A signal conditioning module provides a polarimeter capability in a photometric system. The module may include multiple variable delay polarization modulators. Each modulator may include an input port, and a first arm formed to include a first reflector and first rooftop mirror arranged in opposed relationship. The first reflector may direct an input radiation signal to the first rooftop mirror. Each modulator also may include an output port and a second arm formed to include a second reflector and second rooftop mirror arranged in opposed relationship. The second reflector can guide a signal from the second rooftop mirror towards the output port to provide an output radiation signal. A beamsplitting grid may be placed between the first reflector and the first rooftop mirror, and also between the second reflector and the second rooftop mirror. A translation apparatus can provide adjustment relative to optical path length vis-a-vis the first arm, the second arm and the grid.
    Type: Grant
    Filed: June 20, 2006
    Date of Patent: August 12, 2008
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: David T. Chuss, Edward J. Wollack, Samuel H. Moseley, Giles A. Novak
  • Patent number: 7402794
    Abstract: A radiometer imaging system includes an antenna array having a plurality of sub-arrays, each being formed of a plurality of antenna elements arranged in a sub-Y-type, a receiver array having the same number of receivers as the antenna elements, each receiver being associated with one of the antenna elements in a one-to-one correspondence to thereby define a channel to generate a first signal and a second signal from an output of each antenna element, and a correlation processor for calculating a correlation for each correlated channel pair, by using the first signal and the second signal for each antenna element, to thereby obtain an 3-D image for the object.
    Type: Grant
    Filed: July 8, 2005
    Date of Patent: July 22, 2008
    Assignee: Kwangju Institute of Science and Technology
    Inventors: Yong Hoon Kim, Gm Sil Kang, Sung Hyun Kim, Jun Ho Choi
  • Patent number: 7380455
    Abstract: System and method for resolving phase ambiguities of various transducer arrays, including non-coplanar interferometer antennas on an aircraft skin, in order to determine the direction of arrival of a signal received by the array and emitted by a source remote from the array.
    Type: Grant
    Filed: January 9, 2007
    Date of Patent: June 3, 2008
    Assignee: The Boeing Company
    Inventor: Wayne C. Workman
  • Patent number: 7262729
    Abstract: 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 antenna interfaces are in control and signal communication with the processor, each of the first antennas are in signal communication with one of each antenna interface, and each of the second antennas are in signal communication with one of each antenna interface. The waveform generator is in control and signal communication with each antenna interface, and is configurable to generate a waveform conforming to at least two ISM bands. Each first antenna is configured to transmit a circularly polarized electromagnetic waveform, and each second antenna is configured to receive a reflected circularly polarized electromagnetic waveform complementary to the first antennas.
    Type: Grant
    Filed: June 19, 2006
    Date of Patent: August 28, 2007
    Assignee: General Electric Company
    Inventors: John Erik Hershey, Ralph Thomas Hoctor, David Michael Davenport, Jeffrey Michael Ashe, Richard Louis Frey, Kenneth Brakeley Welles, V. Paul Staudinger, Harold W. Tomlinson, Jr.
  • Patent number: 7251286
    Abstract: Methods and systems consistent with this invention receive a plurality of transmitted signals in a receiver having a plurality of receive elements, wherein each transmitted signal has a different spatial location. Such methods and systems receive the plurality of transmitted signals at the plurality of receive elements to form a plurality of receive element signals, form a combined signal derived from the plurality of receive element signals, and detect each of the plurality of transmitted signals from the combined signal by its different spatial location. To achieve this, methods and systems consistent with this invention generate a plurality of arbitrary phase modulation signals, and phase modulate each of the plurality of receive element signals with a different one of the phase modulation signals to form a plurality of phase modulated signals.
    Type: Grant
    Filed: November 9, 2004
    Date of Patent: July 31, 2007
    Assignee: Greenwich Technologies Associates
    Inventor: Carl M. Elam
  • Patent number: 7242350
    Abstract: Estimating an angle-of-arrival of a signal includes receiving a signal sent from an emitter. The signal is received at a singly polarized antenna system associated with an antenna response model. An autocorrelation matrix having noise-related eigenvectors is generated in response to the signal. Polarization ratios are determined from projections of a noise-related eigenvector onto the antenna response model. A minimum polarization ratio variance is established for the polarization ratios. A polarization vector corresponding to the minimum polarization ratio variance is identified. An angle-of-arrival of the signal is estimated in accordance with the identified polarization vector.
    Type: Grant
    Filed: October 20, 2004
    Date of Patent: July 10, 2007
    Assignee: Raytheon Company
    Inventor: Jerome H. Pozgay
  • Patent number: 7239275
    Abstract: Methods and systems for tracking signals with diverse polarization properties address both sensitivity and antenna tracking performance issues. In one embodiment, complex weightings for matching a polarization of an incident signal on a data channel are determined, and the complex weightings are applied to a tracking channel such that an antenna system polarization is matched to the polarization of the incident signal. In another embodiment, orthogonally polarized tracking channel components of an incident signal are processed to make a determination as to which of the orthogonally polarized tracking channel components is stronger, and this determination is used to select a polarization of a data channel to reduce a polarization mismatch loss.
    Type: Grant
    Filed: March 22, 2004
    Date of Patent: July 3, 2007
    Assignee: The Aerospace Corporation
    Inventors: Robert B. Dybdal, Denny D. Pidhayny
  • Patent number: 7201054
    Abstract: System and method for resolving phase ambiguities of various transducer arrays, including non-coplanar interferometer antennas on an aircraft skin, in order to determine the direction of arrival of a signal received by the array and emitted by a source remote from the array.
    Type: Grant
    Filed: October 18, 2004
    Date of Patent: April 10, 2007
    Assignee: The Boeing Company
    Inventor: Wayne C. Workman
  • Patent number: 7123941
    Abstract: A radio LAN master station system which provides long distance communication and suffers from small interference by another system located inside and/or outside of a service area comprises a transceiver, and a plurality of directional antennas each directed to a respective section with some angular spacing, through a power distributor which couples said transceiver with said antennas. Polarization plane of any antenna is orthogonal to polarization plane of an adjacent antenna.
    Type: Grant
    Filed: February 27, 2002
    Date of Patent: October 17, 2006
    Assignee: KDDI R&D Laboratories Inc.
    Inventors: Tadayuki Fukuhara, Hiroyasu Ishikawa, Takayuki Warabino, Naoki Fuke, Keizo Sugiyama, Hideyuki Shinonaga