With Satellite Signal Correction Patents (Class 342/358)
  • Patent number: 10370125
    Abstract: A vehicle, a satellite control system, and a method for controlling the same are provided. The satellite control system, for example, may include, but is not limited to, a control moment gyroscope having a gimbal, at least one gimbal angle sensor configured to determine an angle of the gimbal, each gimbal angle sensor having an output circuit configured to output the determined angle, a signal conditioner circuit having substantially identical circuit topology as the output circuit, and a common mode error compensation circuit electrically coupled to the signal conditioner, the common mode error compensation circuit configured to determine common mode error in the gimbal angle sensor based upon a voltage output from the signal conditioner circuit and to output a signal to compensate for the common mode error.
    Type: Grant
    Filed: January 13, 2015
    Date of Patent: August 6, 2019
    Assignee: HONEYWELL INTERNATIONAL INC.
    Inventors: Douglas Edward Smith, Don Crippen, Joshua Matthew Stiles, Mostafa Sayed
  • Patent number: 10228251
    Abstract: Where a mobile computer device having a position sensor, such as a GPS sensor, and an accelerometer is configured to estimate a geographic position of the mobile computer device using the position sensor, the accuracy of such positions may be enhanced by correlating accelerations of the mobile computer device, as determined by the accelerometer, against the positions of known surface features within a vicinity of the estimated positions. If the observed accelerations are consistent with one of the known surface features, the location of the mobile computer device may be correlated with the location of the one of the known surface features.
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: March 12, 2019
    Assignee: Amazon Technologies, Inc.
    Inventor: John Nicholas Buether
  • Patent number: 10142778
    Abstract: An apparatus includes an antenna array including at least a first antenna element and a second antenna element separated by a first distance. The apparatus receives a wireless advertising message, having a known bit pattern, via the first and second antenna elements. The apparatus samples a first portion of the known bit pattern from the wireless advertising message received via the first antenna element, and samples a second portion of the known bit pattern from the wireless advertising message received via the second antenna element, and determines a phase difference between the received wireless advertising message at each of the first and second antenna elements by correlating the first sampled portion and the second sampled portion to the known bit pattern. The apparatus then determines an angle of arrival (AoA) of the wireless advertising message based at least in part on the phase difference and the first difference.
    Type: Grant
    Filed: January 7, 2016
    Date of Patent: November 27, 2018
    Assignee: QUALCOMM TECHNOLOGIES INTERNATIONAL, LTD.
    Inventor: Raja Banerjea
  • Patent number: 10088333
    Abstract: A method for real-time calibration of a gyroscope, configured for supplying a value of angular velocity that is function of a first angle of rotation about a first angular-sensing axis that includes defining a time interval, acquiring from an accelerometer an equivalent value of angular velocity that can be associated to the first angle of rotation; calculating a deviation between the value of angular velocity and the equivalent value of angular velocity; iteratively repeating the previous steps through the time interval, incrementing or decrementing an offset variable by a first predefined value on the basis of the values assumed by the deviations during the iterations, and updating the value of angular velocity as a function of the offset variable.
    Type: Grant
    Filed: July 28, 2014
    Date of Patent: October 2, 2018
    Assignee: STMicroelectronics S.R.L.
    Inventor: Daniele Mangano
  • Patent number: 10088312
    Abstract: A method and system are disclosed for providing an estimate of a location of a user receiver device. The method involves emitting, from at least one vehicle, at least one spot beam on Earth; and receiving, with the user receiver device, at least one spot beam. The method further involves calculating, with the user receiver device, the estimate of the location of the user receiver device according to the user receiver device's location within at least one spot beam. Each spot beam contains at least one acquisition signal, which may comprise at least one ring channel. Each ring channel comprises a frame count; a space vehicle identification (SVID); a spot beam identification (ID); and/or X, Y, Z coordinates of the vehicle emitting the spot beam relative to an Earth coordinate system. In one or more embodiments, at least one vehicle may be a satellite and/or a pseudolite.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: October 2, 2018
    Assignee: The Boeing Company
    Inventors: Gregory M. Gutt, David G. Lawrence, David A. Whelan, Michael Lee O'Connor
  • Patent number: 9923626
    Abstract: A method for capturing ionospheric data is disclosed. In accordance with one embodiment, a plurality of phase-coherent signals transmitted by at least one Global Navigation Satellite System (GNSS) satellite is received via a mobile multi-frequency GNSS receiver. Respective code phase data and carrier phase data for each of said plurality of phase-coherent signals are derived using a software defined GNSS receiver operating on a processor of a first communication device of the multi-frequency GNSS receiver. Respective code phase data and carrier phase data for each of the plurality of phase-coherent signals is stored in a data storage device. The respective code phase data and carrier phase data is appended with a respective time-stamp and position fix. An ionospheric sample based upon respective code phase data and carrier phase data of said plurality of phase-coherent signals is wirelessly transmitted to a second location.
    Type: Grant
    Filed: October 13, 2015
    Date of Patent: March 20, 2018
    Assignee: Trimble Inc.
    Inventors: Peter Van Wyck Loomis, Gregory Craig Wallace, Shawn D. Weisenburger, James M. Janky
  • Patent number: 9832666
    Abstract: A method for self-interference cancellation in a wireless communication device. The wireless communication device has an estimator, a transmitter and a cancellation device. The estimator is configured to estimate a known signal received from a second wireless communication device when the second wireless communication device is utilized less than a predetermined threshold. The transmitter is configured to transmit within a coherence time of the estimated known signal, a predetermined signal. The cancellation device is configured to cancel the estimated known signal from a received signal.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: November 28, 2017
    Assignee: Intel Corporation
    Inventors: Feng Xue, Yang-Seok Choi, Shilpa Talwar, Roya Doostnejad
  • Patent number: 9832664
    Abstract: An apparatus for receiving reverse link signals from a plurality of subscriber units in a multi-path environment is described. The apparatus includes a receiver in a base station that receives a first plurality of reverse link signals and a second plurality of reverse link signals in a time interval. Each reverse link signal of the first plurality of reverse link signals is derived from at least a common pseudo noise (PN) sequence and unique orthogonal sequence and each reverse link signal of the second plurality of reverse link signals is derived from a unique pseudo noise (PN) sequence. The apparatus also includes a a processor that determines a timing offset associated with at least one reverse link signal to align a timing of the at least one reverse link signal with reverse link signals from other subscriber units.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: November 28, 2017
    Assignee: IPR Licensing, Inc.
    Inventor: James A. Proctor, Jr.
  • Patent number: 9696408
    Abstract: Various embodiments of the present invention provide methods, systems, apparatus, and computer program products for providing integrated attitude determination and attitude control for slewing of a satellite. In one embodiment a method is provided. The method comprises after receiving a repointing request, selecting a guide star sample comprising one or more guide stars from a guide star catalog; determining current attitude information; selecting and retrieving at least one point spread function (PSF) image from a PSF library; estimating an expected position for at least one guide star, the at least one guide star being one of the guide stars of the guide star sample; acquiring at least one star tracker image; calculating a cross-correlation function (CCF) to determine shifts in position of the at least one guide star compared to the expected position; and determining updated current attitude information based at least in part on the determined shifts in position.
    Type: Grant
    Filed: February 4, 2015
    Date of Patent: July 4, 2017
    Assignee: UNIVERSITY OF FLORIDA RESEARCH FOUNDATION, INC.
    Inventors: Stephen Scott Eikenberry, Norman G. Fitz-Coy
  • Patent number: 9602201
    Abstract: An optical multiplexing includes: a monitor configured to detect power of an optical component including a frequency component of a cross point between spectra of a first sub-carrier signal and a second sub-carrier signal; and a controller configured to control a modulation timing of a data symbol of the second sub-carrier signal according to the power detected by the monitor, wherein the second sub-carrier signal is multiplexed to a carrier to be adjacent to the first sub-carrier signal multiplexed to the carrier so as to generate an optical Orthogonal Frequency Divisional Multiplexing (OFDM) signal in which an interference between the first and second sub-carrier signals is suppressed.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: March 21, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Ryou Okabe, Shigeki Watanabe
  • Patent number: 9562975
    Abstract: Methods and apparatus for processing of GNSS signals are presented. These include GNSS processing with predicted precise clocks, GNSS processing with mixed-quality data, GNSS processing with time-sequence maintenance, GNSS processing with reduction of position jumps in low-latency solutions, GNSS processing with position blending to bridge reference station changes, and GNSS processing with delta-phase correction for incorrect starting position.
    Type: Grant
    Filed: March 19, 2012
    Date of Patent: February 7, 2017
    Assignee: Trimble Inc.
    Inventors: Ulrich Vollath, Nicholas Charles Talbot, Markus Glocker, Xiaoming Chen, Rodrigo Leandro
  • Patent number: 9516617
    Abstract: A high-speed platform telemetry system (“HSPTS”) within a high-speed platform (“HSP”), for compensating for high Doppler in a telemetry stream is disclosed. The HSP is in signal communication with a first station, the telemetry stream is transmitted between the HSP and the first station, and the high Doppler is created by the HSP as the HSP moves along a travel path that passed near the first station. The HSPTS may include a platform transmitter, an on-board storage device having a real-time Doppler map database and navigation information corresponding to the travel path of the HSP, a position location device, a processor in signal communication with the position location device and on-board storage device, and a frequency offset circuit in signal communication with the platform transmitter and processor.
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: December 6, 2016
    Assignee: THE BOEING COMPANY
    Inventor: Edward W. Dollahan, Jr.
  • Patent number: 8971797
    Abstract: The subject matter disclosed herein relates to a system and method for acquiring signal received from satellite vehicles (SVs) in a satellite navigation system. In one example, although claimed subject matter is not so limited, information processed in acquiring a signal from a first SV may be used in acquiring a signal from a second SV.
    Type: Grant
    Filed: August 1, 2007
    Date of Patent: March 3, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Leonid Sheynblat, Ardalan Heshmati, Arnold Jason Gum
  • Patent number: 8938256
    Abstract: A cellular telephone handset stores audio files previously recorded by the user as well as voice mail messages from other users and selectively transmitted selected ones of these files to the remote listener, or to the voice mail system of a remote user. Voice mail messages are composed, stored, transmitted, forwarded and reviewed using a voice mail system without ringing the remote party's telephone, much as email is composed, stored, transmitted and reviewed using an email server.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: January 20, 2015
    Assignee: Intel Corporation
    Inventor: James D. Logan
  • Patent number: 8886225
    Abstract: Methods and apparatuses for determining a position of a mobile satellite positioning system (SPS) receiver which is coupled to a communication receiver or transceiver. In one exemplary method, a change in a communication signal received by the communication receiver is determined. A parameter, based on the change, is determined, and SPS signals from SPS satellites are processed according to the parameter. According to further details of this method, the change involves the fluctuation of the level of the communication signal and the parameter is a motion information which specifies a frequency range for searching for SPS signals in the process of acquiring the SPS signals from SPS satellites. In an alternative embodiment the change in the communication signal is a change in the transmitted signal in response to power control commands. Apparatuses, such as a mobile communication system which includes an SPS receiver and a communication receiver, are also described.
    Type: Grant
    Filed: February 4, 2013
    Date of Patent: November 11, 2014
    Assignee: QUALCOMM Incorporated
    Inventor: Norman F. Krasner
  • Publication number: 20140253369
    Abstract: An adaptive method by which Differential GNSS corrections may be compressed. Each measurement datum to be transmitted to a rover for satellite navigation purposes is decomposed into two parts, namely, an anchor value and a delta value, and in some instances an added third part termed a nonce value is used. Encoding parameters such as the number of bits assigned to each part of the measurement datum, the order of the models used to convey positional data, and scaling constants in the models, are adjusted adaptively based on changing data and/or transmission medium characteristics. Adaptive compression also allows for anomalous conditions such as out-of-range data values to be handled gracefully.
    Type: Application
    Filed: March 5, 2013
    Publication date: September 11, 2014
    Applicant: SubCarrier Systems Corporation
    Inventors: David Charles Kelley, Gregory John Berchin
  • Patent number: 8825236
    Abstract: A method of determining the reliability of long-term predicted orbit data, includes: determining the reliability of long-term predicted orbit data, which is acquired by predicting a satellite orbit in a target period of at least one day, using predicted position data including predicted positions of a positioning satellite in time series and actual position data including actual positions of the positioning satellite corresponding to the predicted positions.
    Type: Grant
    Filed: October 9, 2009
    Date of Patent: September 2, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Kyoichi Tomita
  • Publication number: 20130300601
    Abstract: In order to perform calibration of respective systems of an array antenna with high accuracy for adapting to a change in environmental condition, provided is a calibration device (20A) for calibrating an array antenna mounted on a satellite or the like, the calibration device including: a calibration coefficient calculating unit (21) to calculate a correlation of a plurality of input signals Xi(t,P), which are obtained by performing predetermined signal processing for signals received by an array antenna (11), to calculate weighting coefficients (?W) for calibrating systems of the array antenna; and a calibration executing unit (27) to calibrat the systems of the array antenna based on the weighting coefficients (?W).
    Type: Application
    Filed: July 22, 2011
    Publication date: November 14, 2013
    Applicant: NEC CORPORATION
    Inventor: Youichi Koishi
  • Patent number: 8583360
    Abstract: A navigation system determines its usage mode. In some embodiments, a method comprises determining a usage mode of a navigation system based on at least one of an acceleration indicator, a speed indicator, and a magnet sensor. The usage mode is at least one of a pedestrian mode, a vehicular mode, an aerial mode, a train mode, and a marine mode. The method further comprises configuring a navigation subsystem based on the usage mode.
    Type: Grant
    Filed: February 15, 2011
    Date of Patent: November 12, 2013
    Assignee: Texas Instruments Incorporated
    Inventors: Deric W. Waters, Tarkesh Pande
  • Patent number: 8514966
    Abstract: A method for communication includes modulating data to produce a series of symbols defined in a signal space. The symbols are pulse-shaped using a given pulse shape. A signal, which includes a sequence of the pulse-shaped symbols (104A . . . 104C) transmitted at a symbol rate that is higher than a Nyquist rate defined for the given pulse shape, is transmitted to a receiver (40). Prior to pulse-shaping the symbols, Inter-Symbol Interference (ISI) in the signal is pre-compensated for by applying a lattice precoding operation to the symbols. The lattice precoding operation confines the symbols to a predefined volume (110) in the signal space and is computed independently of any feedback from the receiver.
    Type: Grant
    Filed: October 22, 2009
    Date of Patent: August 20, 2013
    Assignee: Novelsat Ltd.
    Inventors: Daniel Wajcer, Uri Beitler
  • Patent number: 8437693
    Abstract: A wireless communications device comprises a communication receiver and a positioning system receiver in the wireless mobile communication device. An absolute time signal is received at the positioning system. A network time signal is received at the communication receiver of the wireless mobile communication device. A controller is in signal communication with the position system receiver and the communication receiver. The controller is configured to determine an offset of the absolute time signal from the network time signal and generates a timing mark. The timing mark is tagged by the positioning system receiver with an internal clock value wherein the timing mark has a known relationship with the absolute time signal. A memory stores the offset of the absolute time signal from the network time signal. A transmitter in the wireless mobile communication device transmits the offset for receipt by another wireless mobile communication device.
    Type: Grant
    Filed: March 24, 2011
    Date of Patent: May 7, 2013
    Assignee: CSR Technology Inc.
    Inventors: Jim Brown, Gengsheng Zhang, Lionel Garin
  • Patent number: 8427368
    Abstract: Gain measurements of one or more calibration signals communicated by one or more calibration stations and retransmitted by one or more satellite elements may be obtained. One or more weights indicating confidence in the gain measurements for the one or more satellite elements may be computed. A geodetic radiation gain pattern of a satellite element that is a function of a roll, a pitch, and a yaw of a satellite may be accessed. Partial derivatives of the geodetic radiation pattern may be computed with respect to roll, pitch and yaw at one or more points in the first geodetic radiation pattern corresponding to one or more geographic locations. A cost function may be generated and one or more unknown variables may be computed by reducing the cost function. A satellite pointing error may be determined using the computed variable values and the pointing error may be stored.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: April 23, 2013
    Assignee: RKF Engineering Solutions, LLC
    Inventors: Jeffrey Freedman, Erik Halvorson, Scott Markley
  • Patent number: 8427369
    Abstract: In one implementation, a first measurement of gain of a first calibration signal retransmitted from a first satellite element and a second measurement of gain of a second calibration signal retransmitted from a second satellite element may be obtained. A first expected gain for the first element and a second expected gain for the second element may be accessed. A weight indicative of a confidence in the first measurement may be computed using a gradient of a geodetic radiation pattern of the first element. A weight indicative of a confidence in the second measurement also may be computed using a gradient of a radiation pattern of the second element. A cost function may be generated and values for one or more unknown variables may be computed by reducing the cost function with respect to the one or more unknown variables. The computed values for the unknown variables may be stored.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: April 23, 2013
    Assignee: RKF Engineering Solutions, LLC
    Inventors: Jeffrey Freedman, Erik Halvorson, Scott Markley
  • Patent number: 8369873
    Abstract: Methods and apparatuses for determining a position of a mobile satellite positioning system (SPS) receiver which is coupled to a communication receiver or transceiver. In one exemplary method, a change in a communication signal received by the communication receiver is determined. A parameter, based on the change, is determined, and SPS signals from SPS satellites are processed according to the parameter. According to further details of this method, the change involves the fluctuation of the level of the communication signal and the parameter is a motion information which specifies a frequency range for searching for SPS signals in the process of acquiring the SPS signals from SPS satellites. In an alternative embodiment the change in the communication signal is a change in the transmitted signal in response to power control commands. Apparatuses, such as a mobile communication system which includes an SPS receiver and a communication receiver, are also described.
    Type: Grant
    Filed: August 9, 2007
    Date of Patent: February 5, 2013
    Assignee: QUALCOMM Incorporated
    Inventor: Norman F. Krasner
  • Patent number: 8321074
    Abstract: Present novel and non-trivial system, device, and method for generating altitude data and/or height data are disclosed. A processor receives navigation data from an external source such as a global positioning system (“GPS”); receives navigation data from multiple internal sources; receives object data representative of terrain or surface feature elevation; determines an instant measurement of aircraft altitude as a function of these inputs; and generates aircraft altitude data responsive to such determination. In an additional embodiment, the processor receives reference point data representative of the elevation of the stationary reference point (e.g., a landing threshold point); determines an instant measurement of aircraft height as a function of this input and the instant measurement of aircraft altitude; and generates aircraft height data responsive to such determination.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: November 27, 2012
    Inventors: Douglas A. Bell, James H. Doty
  • Patent number: 8289208
    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: Grant
    Filed: May 8, 2008
    Date of Patent: October 16, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Bon-Jun Ku, Do-Seob Ahn, Ho-Jin Lee
  • Patent number: 8260548
    Abstract: A satellite based positioning method and system including storing satellite sub-almanac data on a mobile station. Embodiments include using the sub-almanac data to take measurements and calculate a coarse position of the mobile station. Embodiments further include a location server calculating a correction to the coarse position, and the location server determining whether any sub-almanacs used to calculate the coarse position require replacement.
    Type: Grant
    Filed: July 30, 2010
    Date of Patent: September 4, 2012
    Assignee: CSR Technology Inc.
    Inventors: Lionel J. Garin, Kurt Christian Schmidt
  • Patent number: 8180372
    Abstract: The terminal apparatus has: base station and terminal error information generating means for generating base station and terminal error information indicating a rate of the base station and terminal frequency difference with respect to the official frequency; geostationary satellite and terminal difference information generating means for generating geostationary satellite and terminal difference information indicating a geostationary satellite and terminal frequency difference; geostationary satellite and terminal error information generating means for generating geostationary satellite and terminal error information indicating a rate of the geostationary satellite and terminal frequency difference with respect to the geostationary satellite frequency; base station frequency error information generating means for generating base station frequency error information indicating a frequency error of a transmitting radio wave from the communication base station based on the base station and terminal error.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: May 15, 2012
    Assignee: Seiko Epson Corporation
    Inventor: Maho Terashima
  • Patent number: 8179313
    Abstract: Estimation of a desired antenna tracking profile is provided for a radio frequency autotracked (RFAT) antenna in the absence of a ground reference. A first RFAT antenna subsystem has a first antenna and a first antenna positioning mechanism (APM), each mounted on a vehicle, and a first ground-based RF beacon; a second RFAT antenna subsystem has a second antenna and a second APM, each mounted on the vehicle, and a second ground-based RF beacon. A controller stores an accumulated record of actuations of the second APM as a function of time under normal operation, calculates a desired antenna tracking profile for the second antenna, from a first ground-based RF beacon and from the accumulated record, excluding any real-time data from the second ground-based RF beacon, and transmits actuation commands to the second APM so as to cause the second antenna to track the desired antenna tracking profile.
    Type: Grant
    Filed: May 13, 2010
    Date of Patent: May 15, 2012
    Assignee: Space Systems/Loral, Inc.
    Inventors: Yassir Azziz, Alicia Kavelaars, Xen Price, David Cielaszyk, Rob Schwarz
  • Patent number: 8116976
    Abstract: A satellite based positioning method and system including storing satellite sub-almanac data on a mobile station. Embodiments include using the sub-almanac data to take measurements and calculate a coarse position of the mobile station. Embodiments further include a location server calculating a correction to the coarse position, and the location server determining whether any sub-almanacs used to calculate the coarse position require replacement.
    Type: Grant
    Filed: August 7, 2007
    Date of Patent: February 14, 2012
    Assignee: CSR Technology Inc.
    Inventors: Lionel J. Garin, Kurt C. Schmidt
  • Patent number: 8027784
    Abstract: A navigation device is disclosed. In at least one embodiment, the navigation device includes a storage device to store map information; a processor to determine a route of travel based upon a current position of the navigation device and an input or selected destination position; and a display to display the current position on the map information corresponding to the determined route of travel, the display displaying zoomed-in display of the map information upon the processor determining that a decision point is within a threshold distance of the current position of the navigation device.
    Type: Grant
    Filed: November 12, 2008
    Date of Patent: September 27, 2011
    Assignee: TomTom International B.V.
    Inventor: Pieter Geelen
  • Patent number: 8023960
    Abstract: The terminal apparatus has: base station and terminal error information generating means for generating base station and terminal error information indicating a rate of the base station and terminal frequency difference with respect to the official frequency; geostationary satellite and terminal difference information generating means for generating geostationary satellite and terminal difference information indicating a geostationary satellite and terminal frequency difference; geostationary satellite and terminal error information generating means for generating geostationary satellite and terminal error information indicating a rate of the geostationary satellite and terminal frequency difference with respect to the geostationary satellite frequency; base station frequency error information generating means for generating base station frequency error information indicating a frequency error of a transmitting radio wave from the communication base station based on the base station and terminal error.
    Type: Grant
    Filed: October 11, 2006
    Date of Patent: September 20, 2011
    Assignee: Seiko Epson Corporation
    Inventor: Maho Terashima
  • Patent number: 8019540
    Abstract: In a method and apparatus for processing a received navigation signal x?(t) of a satellite navigation system, the received navigation signal x?(t) contains at least four navigation codes. The navigation codes are modulated by a complex BOC signal and a defined subcarrier frequency such that the resulting signal has a constant amplitude. The resulting signal is then also modulated by means of a carrier signal. The navigation signal x?(t) is demodulated and then processed by a complex correlation with at least one reference signal.
    Type: Grant
    Filed: April 29, 2003
    Date of Patent: September 13, 2011
    Assignee: European Space Agency
    Inventor: Matthias Soellner
  • Patent number: 8000867
    Abstract: Disclosed herein are a system for automatically landing an aircraft using image signals and a method of controlling the system. The system includes an altimeter installed on the aircraft; a landing mark placed at a landing location on a landing runway; a camera installed on the aircraft, oriented toward the front of the aircraft, and configured to detect the shape of the landing mark in image information form; and a FCC configured to calculate the angle between the aircraft and the ground, the ground range and the slant range between the aircraft and the landing location using the altitude information measured by the altimeter, the image information of the landing mark captured by the camera, angle information composed of the pitch, roll and yaw angles of the aircraft, and the angle of entry into the landing runway, and configured to control the automatic landing of the aircraft.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: August 16, 2011
    Assignee: Korea Aerospace Research Institute
    Inventor: Hyeon-Cheol Lee
  • Patent number: 7978133
    Abstract: GPS gyro calibration methods and systems are described. In an embodiment, a ground station can receive antenna position data for a spot beam antenna from a global positioning system (GPS) platform where the antenna position data indicates a boresight direction of the spot beam antenna. GPS-enabled receiver(s) can receive scan signals transmitted via the spot beam antenna of the GPS platform, and the GPS-enabled receivers can determine signal power measurements for each of the scan signals. The ground station can receive the signal power measurements from the GPS-enabled receiver(s) and estimate a pointing error of the spot beam antenna based on the signal power measurements and the antenna position data received from the GPS platform. The ground station can then determine gyro calibration parameters from the estimated pointing error and communicate the gyro calibration parameters to the GPS platform to calibrate for gyro drift errors.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: July 12, 2011
    Assignee: The Boeing Company
    Inventors: Jonathan A Tekawy, Kevin M O'Brien
  • Patent number: 7956802
    Abstract: A vertical integrity monitoring method and system are described. The vertical integrity monitoring method includes determining a noise sigma ratio parameter. The method also includes determining two vertical protection limit slopes and an associated covariance matrix. The method further includes determining a vertical integrity limit and set of weights based on the VPL slopes, covariance and the parameter; and applying the set of weights based on the parameter to calculate a vertical solution. An integrity monitoring system may have hardware and/or software embodying the one or more methods described.
    Type: Grant
    Filed: May 21, 2007
    Date of Patent: June 7, 2011
    Assignee: Rockwell Collins, Inc.
    Inventors: Patrick Y. Hwang, R. Grover Brown
  • Patent number: 7800536
    Abstract: A Doppler frequency searching method and correlator are disclosed. In the present invention, before Doppler frequency removal, a received signal is converted into digital form and the spreading code is removed. Then the signal is down-sampled to have a low sampling rate, which can be determined according to the maximum Doppler frequency to be searched. The Doppler frequency searching is done by stages. Each stage is in charge of a portion of the Doppler frequency to be removed. The sampling rate can be further reduced in each stage. Each stage can have a plurality of Doppler frequency removal units sharing the portion of Doppler frequency that the stage is to remove. Power consumption is reduced since Doppler frequency removal is executed with low sampling rate.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: September 21, 2010
    Assignee: MEDIATEK, Inc.
    Inventor: Kun-tso Chen
  • Patent number: 7761054
    Abstract: A method and system for receiving a beacon signal includes a splitter that divides a beacon signal into a first beacon signal and a second beacon signal. The system includes a pair of downconverters down converting the beacon signals into down converted signals. A pair of beacon receivers receives the two downconverted signals and a controller communicates with the first beacon receiver and the second beacon receiver through a first connection and a second connection. Upon interruption of the first connection, the second connection is used for communicating the beacon signals.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: July 20, 2010
    Assignee: The DIRECTV Group, Inc.
    Inventor: Salvador A. Lozano
  • Patent number: 7755542
    Abstract: Methods and apparatus for processing of data from a network of GNSS reference stations are presented. An ionosphere-free, federated geometry filter is employed so that computation time increases only linearly with the increase in number of reference stations, significantly reducing processing time as compared to a centralized filter approach.
    Type: Grant
    Filed: March 7, 2007
    Date of Patent: July 13, 2010
    Assignee: Trimble Navigation Limited
    Inventors: Xiaoming Chen, Ulrich Vollath
  • Patent number: 7751974
    Abstract: A method for navigation processing in a satellite positioning system receiver is disclosed. A method in accordance with the present invention comprises separating the three SATPS satellites into a first pair and a second pair, constructing a primary solution and an alternate solution, wherein the primary solution and the alternate solution satisfy the measurement constraints, computing a Doppler difference estimate for the primary solution and a Doppler difference estimate for the alternate solution, computing Doppler difference residuals for the first pair and the second pair of SATPS satellites, and comparing the Doppler difference residuals for said primary and alternate solutions to determine a valid solution. Typically, the computing of a Doppler difference residuals comprises differencing a measured Doppler difference from an estimated Doppler difference for the first pair and the second pair of SATPS satellites.
    Type: Grant
    Filed: March 17, 2005
    Date of Patent: July 6, 2010
    Assignee: SiRF Technology, Inc.
    Inventors: Keith Jacob Brodie, David Allan Tuck, Mangesh M. Chansarkar
  • Patent number: 7747384
    Abstract: A method for substituting at least one high quality position measurement of an object taken before an interrupting event with a set of upgraded low quality position measurements of the object provided by the same source of measurements after the interrupting event.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: June 29, 2010
    Assignee: Trimble Navigation, Ltd.
    Inventors: Vivek Bhalchandra Nadkarni, Scott R. Smith
  • Patent number: 7702459
    Abstract: A method of GPS accuracy adjustment for an integrated INS/GPS navigation system which utilizes microelectro mechanical systems (MEMS) based inertial sensors to mitigate multipath problems arising when a vehicle is in an area with many high-rise buildings is disclosed. Even when GPS measurement output values are deviated from that expected, the INS/GPS navigation system uses as many measurement outliers as possible without discarding, unless they are obvious error values, thereby maintaining a practical level of accuracy. The measurement outliers typically occur when the integrated INS/GPS navigation system receives GPS signals which have transmitted through multipaths such as reflection by buildings, since the signal path lengths vary.
    Type: Grant
    Filed: October 17, 2006
    Date of Patent: April 20, 2010
    Assignee: Alpine Electronics, Inc.
    Inventor: Takayuki Hoshizaki
  • Publication number: 20100085247
    Abstract: A device can access scaled values and scaling factors, which are used to convert the scaled values into coefficients and residuals. The coefficients and residuals can in turn be used with time-dependent functions to reconstruct predicted ephemeris data, including clock correction data, for satellite navigation system satellites. Ephemeris data that is broadcast from any of the satellites can be used to update the calculated ephemeris data.
    Type: Application
    Filed: October 8, 2008
    Publication date: April 8, 2010
    Inventors: Sai VENKATRAMAN, Janne JARVENPAA, Qinfang SUN
  • Patent number: 7693660
    Abstract: A method and apparatus for determining long term orbit (LTO) models using variable time-horizons to improve the orbit and clock model accuracy. The method and apparatus use either historic ephemeris or historic measurements for at least one satellite to produce an orbit parameter prediction model (an LTO model). The parameter predicted by the model is compared to an orbit parameter of a current broadcast ephemeris. The result of the comparison (an indicia of accuracy for the model) is used to establish a time-horizon for the orbit parameter prediction model for that particular satellite. Such a time-horizon may be established in this manner for each satellite within a satellite constellation.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: April 6, 2010
    Assignee: Global Locate, Inc.
    Inventors: Frank van Diggelen, Matthew Riben
  • Patent number: 7668629
    Abstract: A GNSS ultra-tight coupling (UTC) receiver architecture applicable to space borne orbit platforms is described. A receiver in accordance with this architecture retains the rotational motion sensors typically found in an inertial measurement unit (IMU) of a conventional UTC receiver, but replaces the IMU accelerometer sensors with precise orbital dynamics models to predict the translational motion of the platform center of gravity (CG). Drag and radiation pressure may be modeled as well. The various models can be implemented in software. The IMU rotational sensors are retained for compensation of the GNSS antenna lever arm effect due to platform rotation.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: February 23, 2010
    Assignee: The Boeing Company
    Inventors: Raymond S DiEsposti, Jonathan A Tekawy
  • Patent number: 7647173
    Abstract: The invention relates to a data server (40) used in a system (10) for supplying complementary data, so-called augmentation data, for satellite navigation signals. The inventive server (40) is especially adapted to be used with elements that are compatible with those used in EGNOS technology (European Geostationary Navigation Overlay Service). Said system (10) for supplying augmentation data for the satellite navigation signals comprises at least one calculator (20) for the determination of said augmentation data, said augmentation data being determined from data transmitted by at least one receiving station (S01. . . SON) receiving navigation information sent by means of at least one satellite. Said server (40) comprises a first inlet (401) for receiving the augmentation data transmitted by the calculator (20), a first outlet (402) for transmitting the augmentation data towards at least one user (U01. . .
    Type: Grant
    Filed: June 28, 2004
    Date of Patent: January 12, 2010
    Assignee: Alcatel Lucent
    Inventors: Bernard Charlot, Etienne Dunas
  • Patent number: 7623871
    Abstract: Techniques to determine a position estimate for a wireless terminal. An accurate position estimate for the initially obtained (e.g., based on a first (accurate) position determination sub-system). For each of one or more transmitters (e.g., base stations) in a second (less accurate) position determination sub-system, an “expected” pseudo-range is computed based on the accurate position estimate for the terminal and the base station location, a “measured” pseudo-range is also obtained, and a pseudo-range residual is then determined based on the expected pseudo-range and the measured pseudo-range. Therefore, to determine an updated position estimate for the terminal, measured pseudo-ranges are obtained for a sufficient number of transmitters. The measured pseudo-range for each base station may be corrected based on the associated residual. The updated position estimate is then determined based on the corrected pseudo-ranges for these transmitters.
    Type: Grant
    Filed: April 24, 2002
    Date of Patent: November 24, 2009
    Assignee: QUALCOMM Incorporated
    Inventor: Leonid Sheynblat
  • Patent number: 7620403
    Abstract: A mobile communication device (202) and peer mobile communication devices (204, 206) are capable of direct voice and data communication. The mobile communication device has a reference oscillator (104) which is used for generating operating frequencies, and is subject to frequency errors resulting from manufacturing tolerances, heat, and other error sources. The mobile communication device receives a frequency correction message (506) from a peer mobile communication device that has calibrated its reference oscillator. The frequency correction message contain offset information which is used by the mobile communication device to determine its offset (316) from a nominal frequency (302).
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: November 17, 2009
    Assignee: Motorola, Inc.
    Inventors: Jose E. Korneluk, Bobby D. Anderson, Kristi A. Haverkamp, Keith M. Klug, Charles H. Segerson
  • Patent number: 7599796
    Abstract: The dual mode positioning system comprises multiple wireless network devices, one of the multiple wireless network devices including a GPS receiver. DSS is coupled to the multiple wireless network devices and an operation mode switch is also coupled to the multiple wireless network devices including a GPS receiver. A satellite GPS receiver coupled to the operation mode switch. The satellite GPS receiver is operated in an indoor area confined by walls with wide FOV (field of view) glass window, the operation mode switch switching to GPS mode for the satellite GPS receiver receives signals from greater than 3 satellites. Moreover, the satellite GPS receiver is operated in an indoor area confined by concrete walls or walls with narrow FOV glass window, the operation mode switch switching to Joint GPS/WPS mode for the satellite GPS receiver cannot receive signals from greater than 3 satellites.
    Type: Grant
    Filed: May 11, 2006
    Date of Patent: October 6, 2009
    Assignee: Accton Technology Corporation
    Inventors: Ting-Yi Tsai, Kuen-Ruey Lu, I-Ru Liu, Te-Yao Liu
  • Patent number: RE42891
    Abstract: The apparatus of the present invention uses radar altimeter measurements and stored terrain altitude profiles to provide pre-filtered observations to a Kalman filter for estimating barometric offset at the airport runway, and barometric scale factor for offsets above the runway. These offsets are used with the smoothed baro-inertial output from an inertial reference system to provide 3 dimensional constant rate of descent approach procedures to replace non-precision approach procedures based on constant barometric altitude step approaches. The horizontal positions used as reference for the stored terrain altitude profiles are obtained from a prior art navigation apparatus. The integrity of all measurements is assured by using long term averages of the Kalman filter residuals to detect failures. In addition, the estimated baro offset at the runway is compared for consistency with the baro offset obtained by the pilot from the airport by radio.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: November 1, 2011
    Assignee: Northrop Grumman Guidance and Electronics Company, Inc.
    Inventor: John W. Diesel