With Remote Cooperating Station Patents (Class 342/125)
  • Patent number: 10444336
    Abstract: Aspects of the present disclosure provide a first apparatus configured to transmit a first signal having a first frequency to a second apparatus, receive, from the second apparatus, a second signal having a second frequency responsive to the first signal, determine a latency associated with the transmitted first signal and received second signal and, determine a distance between the first apparatus and the second apparatus based, at least in part, on the determined latencies. According to an example, the first apparatus further determines a direction of the second apparatus relative to the first apparatus. According to an example, at least one of the first signal or second signal comprises an ultrasonic or high-frequency signal.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: October 15, 2019
    Assignee: BOSE CORPORATION
    Inventors: Rameshwar Sundaresan, Brian S. Lingard, Peter J. Gjeltema
  • Patent number: 10424194
    Abstract: A pedestrian protection system using a beacon signal includes a beacon device mounted on a vehicle to transmit a beacon signal, a beacon signal receiver configured to receive the beacon signal transmitted by the beacon device of the vehicle, bollard devices disposed adjacent to one side of a crosswalk toward a sidewalk where a person waits to cross a street at the crosswalk, a pedestrian display device, a lighting device configured to brighten the crosswalk or the sidewalk, a speaker configured to notify the pedestrian or the waiting pedestrian of the approaching of the vehicle, and a controller configured to identify the approaching of the vehicle based on the beacon signal received from the beacon signal receiver, to receive information about the pedestrian or waiting pedestrian from the bollard device, and to control operations of the pedestrian display device and the lighting device.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: September 24, 2019
    Assignee: PASSNET CO., LTD.
    Inventors: Jung Hoon Jung, Kyun-Ork Park
  • Patent number: 10408929
    Abstract: Various systems and methods for determining a distance between a master device and a slave device based, at least in part, on a received signal strength and based, at least in part, on a time interval including generation of a master ranging symbol and detection of a slave ranging symbol.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: September 10, 2019
    Assignee: Intel Corporation
    Inventors: Raghavendra R., Raghavendra Bhat, Viswanath Dibbur
  • Patent number: 10371823
    Abstract: In accordance with one or more aspects of the present disclosure, a method for ranging of a PRN receiver including generating, at a PRN transmitting device that includes a processor and wireless transmitter and is in a line-of-sight position with the PRN receiver, at least two component codes, time shifting, with the processor of the PRN transmitting device, the at least two component codes relative to each other to form time shifted component codes, wirelessly transmitting, with the PRN transmitting device, the time shifted component codes to the PRN receiver with a predetermined modulation, and receiving the time shifted component codes with the PRN receiver that includes a PRN receiver processor, and determining a range estimate of the PRN receiver based on a combination of the time shifted component codes with the PRN receiver processor.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: August 6, 2019
    Assignee: The Boeing Company
    Inventors: Isaac Jeng, Kamran Ghassemi
  • Patent number: 9747799
    Abstract: A modulating and demodulating section receives, from another radio device, a packet signal including at least position information of another vehicle in which the other radio device is mounted. A position information acquiring section acquires position information of the vehicle in which the radio device is mounted. An estimating section estimates a time taken for the vehicle and the other vehicle to encounter each other on the basis of these two pieces of position information. A deriving section derives a distance between the vehicle and the other vehicle on the basis of these two pieces of position information. A determining section provides notification of an encounter with the other vehicle in a case where the estimated time is equal to or less than a first threshold value or in a case where the derived distance is equal to or less than a second threshold value.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: August 29, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Teppei Shibata, Hiroyuki Watanabe
  • Patent number: 9715009
    Abstract: A system (100) for providing an integrated multi-sensor detection and countermeasure against commercial unmanned aerial systems/vehicles (44) and includes a detecting element (103, 104, 105), a tracking element (103,104, 105) an identification element (103, 104, 105) and an interdiction element (102). The detecting element detects an unmanned aerial vehicle in flight in the region of, or approaching, a property, place, event or very important person. The tracking element determines the exact location of the unmanned aerial vehicle. The identification/classification element utilizing data from the other elements generates the identification and threat assessment of the UAS. The interdiction element, based on automated algorithms can either direct the unmanned aerial vehicle away from the property, place, event or very important person in a non-destructive manner, or can disable the unmanned aerial vehicle in a destructive manner.
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: July 25, 2017
    Assignee: XiDrone Systems, Inc.
    Inventors: Dwaine A. Parker, Damon E. Stern, Lawrence S. Pierce
  • Patent number: 9709662
    Abstract: A bistatic radar system may include a transmitter, a target at a first known position, a receiver at a second known position, and a transmitter position determination unit. The receiver is configured to receive one or more reflected radar signals transmitted from the transmitter and reflected off the target. The receiver is configured to receive one or more direct radar signals transmitted from the transmitter. The transmitter position determination unit is configured to determine a position of the transmitter based on a determination of a distance between the first and second known positions and a determination of a first angular difference between the reflected radar signal(s) and the direct radar signal(s) that are received by the receiver.
    Type: Grant
    Filed: August 18, 2014
    Date of Patent: July 18, 2017
    Assignee: The Boeing Company
    Inventors: James Bryan Baker, Gary Alan Ray
  • Patent number: 9689976
    Abstract: A system for providing integrated detection and countermeasures against unmanned aerial vehicles include a detecting element, an location determining element and an interdiction element. The detecting element detects an unmanned aerial vehicle in flight in the region of, or approaching, a property, place, event or very important person. The location determining element determines the exact location of the unmanned aerial vehicle. The interdiction element can either direct the unmanned aerial vehicle away from the property, place, event or very important person in a non-destructive manner, or can cause disable the unmanned aerial vehicle in a destructive manner.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: June 27, 2017
    Assignee: XiDrone Systems, Inc.
    Inventors: Dwaine A. Parker, Damon E. Stern, Lawrence S. Pierce
  • Patent number: 9645229
    Abstract: A radar or sonar system amplifies the signal received by an antenna of the radar system or a transducer of the sonar system is amplified and then subject to linear demodulation by a linear receiver. There may be an anti-aliasing filter and an analog-to-digital converter between the amplifier and the linear receiver. The system may also have a digital signal processor with a network stack running in the processor. That processor may also have a network interface media access controller, where the system operates at different ranges, the modulator may produce pulses of two pulse patterns differing in pulse duration and inter-pulse spacing, those pulse patterns are introduced and used to form two radar images with the two images being derived from data acquired in a duration not more than twenty times larger than the larger inter-pulse spacing, or for a radar system, larger than one half of the antenna resolution time. One or more look-up tables may be used to control the amplifier.
    Type: Grant
    Filed: June 20, 2016
    Date of Patent: May 9, 2017
    Assignee: FLIR Belgium BVBA
    Inventors: Richard Jales, Andrew Lawrence, Matthieu Maindrou
  • Patent number: 9608698
    Abstract: Communications between a base station and a transponder that is powered by the base station are effected using a signal differentiation approach. A first radio frequency signal is communicated between the base station and the transponder to power the transponder, with the first radio frequency signal including noise and data for authenticating communications between the base station and the transponder. A second radio frequency signal is communicated between the base station and the transponder, with the second radio frequency signal including data for authenticating communications between the base station and the transponder. The detection of noise presented via the first radio frequency signal is mitigated while detecting data in the second radio frequency signal, via signal differentiation.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: March 28, 2017
    Assignee: NXP B.V.
    Inventors: Frans Sessink, Frank Verwaal
  • Patent number: 9584981
    Abstract: Method, hardware, device, computer program, and apparatus for positioning mobile devices in unmapped locations based on motion sensor and radio frequency measurements are described. A reference radio signal is received from a transmitter with an unknown absolute position and a reference range measurement is calculated. Mobile device motion sensor data is used to estimate a relative position of the mobile device. A sample radio signal is received from a transmitter with an unknown absolute position and a sample range measurement is calculated. The reference range measurement and the sample range measurement are compared. The estimated motion sensor based position is adjusted according to the result of the comparison.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: February 28, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Nima Noorshams, Payam Pakzad, Ravi Palanki
  • Patent number: 9568601
    Abstract: Determining a speed and a range of an object by generating at least a first, second, and third interval-specific tone phase signals associated with at least three successive time intervals, wherein at least two of the generated and transmitted tones are different frequencies; determining at least a first, second and third interval-specific average phase value from the respective interval-specific tone phase signals; and then determining a range estimate of the object and determining a speed estimate of the object using at least two phase differences between the at least first, second and third interval-specific average phase values.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: February 14, 2017
    Assignee: Innophase Inc.
    Inventors: Yang Xu, Nicolo Testi, Yuanwei Jin
  • Patent number: 9558383
    Abstract: When multiple readers for RF transponders have to be placed in close proximity, such as in adjacent lanes of a highway toll barrier, they can be set to operate at different frequencies. When signals from two adjacent ones of the readers interfere, the resulting signal includes interference terms whose frequencies equal the sum of the reader frequencies and the difference between the reader frequencies. To remove such interference terms while passing the desired terms, a tag includes a low-pass or other frequency-selective filter.
    Type: Grant
    Filed: August 12, 2014
    Date of Patent: January 31, 2017
    Assignee: Amtech Systems, LLC
    Inventor: Robert W. Tiernay
  • Patent number: 9551640
    Abstract: A mechanism is provided for identifying a wire-pull test location on a wire of a microelectronic package. A first distance between a first terminating location of the wire on the microelectronic package and a second terminating location of the wire on the microelectronic package is determined. Based on the first distance, a second distance from either the first terminating location or the second terminating location is determined as the wire-pull test location for testing a strength of a connection of the wire to at least one of the first terminating location or the second terminating location. An adjustment is performed such that a visual guide is oriented on the wire at the wire-pull test location.
    Type: Grant
    Filed: September 3, 2015
    Date of Patent: January 24, 2017
    Assignee: International Business Machines Corporation
    Inventors: Mark T. W. Lam, Katsuyuki Yonehara
  • Patent number: 9489848
    Abstract: A modulating and demodulating section receives, from another radio device, a packet signal including at least position information of another vehicle in which the other radio device is mounted. A position information acquiring section acquires position information of the vehicle in which the radio device is mounted. An estimating section estimates a time taken for the vehicle and the other vehicle to encounter each other on the basis of these two pieces of position information. A deriving section derives a distance between the vehicle and the other vehicle on the basis of these two pieces of position information. A determining section provides notification of an encounter with the other vehicle in a case where the estimated time is equal to or less than a first threshold value or in a case where the derived distance is equal to or less than a second threshold value.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: November 8, 2016
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Teppei Shibata, Hiroyuki Watanabe
  • Patent number: 9419685
    Abstract: A power transmitting device includes a power transmitter (21) transmitting electric power in a contactless manner, a data communicator (22) obtaining identification information of at least one power receiving device that has become possible to receive electric power transmitted from the power transmitter (21), a power receiving device finding/separation detector (261) counting a number of state switchings between a power unreceivable state and the power receivable state during a predetermined period of time, for each power receiving device of which identification information has been obtained, and a power transmission controller (263) controlling electric power transmission performed by the power transmitter (21), on the basis of the number of state switchings counted by the power receiving device finding/separation detector (261).
    Type: Grant
    Filed: April 12, 2012
    Date of Patent: August 16, 2016
    Assignee: NEC Corporation
    Inventor: Mitsuhiro Kitani
  • Patent number: 9372257
    Abstract: A radar or sonar system amplifies the signal received by an antenna of the radar system or a transducer of the sonar system is amplified and then subject to linear demodulation by a linear receiver. There may be an anti-aliasing filter and an analog-to-digital converter between the amplifier and the linear receiver. The system may also have a digital signal processor with a network stack running in the processor. That processor may also have a network interface media access controller, where the system operates at different ranges, the modulator may produce pulses of two pulse patterns differing in pulse duration and inter-pulse spacing, those pulse patterns are introduced and used to form two radar images with the two images being derived from data acquired in a duration not more than twenty times larger than the larger inter-pulse spacing, or for a radar system, larger than one half of the antenna resolution time. One or more look-up tables may be used to control the amplifier.
    Type: Grant
    Filed: May 1, 2015
    Date of Patent: June 21, 2016
    Assignee: Raymarine UK Limited
    Inventors: Richard Jales, Andrew Lawrence, Matthieu Maindrou
  • Patent number: 9071234
    Abstract: Embodiments of a high-resolution link-path delay estimator and method are generally described herein. The high-resolution link-path delay estimator may estimate a signal-path delay of a signal path between a master and remote device. The high-resolution link-path delay estimator may phase-shift a transmit signal of alternating symbols by phase-shift values and may sample a loopback signal. A noise-reduced version of the sampled signal output may be correlated with a step function to generate a correlation value for each of the phase-shift values. One of the phase-shift values may be selected to generate a fine-delay estimate which may be added to a coarse delay estimate to determine the signal-path delay. The coarse delay estimate may be an estimate of the signal-path delay to a nearest symbol period of the transmit signal and the fine-delay estimate may be an estimate to within a fraction of the symbol period.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: June 30, 2015
    Assignee: Raytheon Company
    Inventors: Brian A. Gunn, Bruce A. Jensen, Jayoung Nam
  • Patent number: 9019151
    Abstract: System and method for determining the distance between a radio beacon and a vehicle device passing in the radio beacon, in a road toll system. A signal having a known temporal profile is emitted by one of the radio beacon and vehicle device. The signal is captured in the other component during the passing of the device and the temporal profile of the frequency is recorded in relation to the known temporal profile; a modification in the recoded frequency profile exceeding a first threshold value is detected; two distant wave zones in the frequency profile, lying temporally in front of and behind the detected modification are determined, the zones displaying a frequency modification below a second threshold value are searched for; the recorded frequency profile is scaled in such a way that the distant wave zones take the predetermined values; and the distance is determined from the scaled frequency profile.
    Type: Grant
    Filed: November 29, 2011
    Date of Patent: April 28, 2015
    Assignee: Kapsch TrafficCom AG
    Inventors: Dieter Smely, Josef Winkler, Oliver Nagy, Alexander Paier, Robert Povolny
  • Patent number: 8976060
    Abstract: Distance between two radio frequency devices is estimated by receiving a plurality of spread spectrum chirp signals frequency offset from one another, and evaluating the received plurality of spread spectrum chirp signals for relative phase shifts between the plurality of spread spectrum chirp signals. A fine propagation time is derived using the phase shifts between the spread spectrum chirp signals. A frequency domain despreading window is shifted to reduce the influence of time-delayed near multipath signals in receiving the plurality of spread spectrum chirp signals.
    Type: Grant
    Filed: August 12, 2011
    Date of Patent: March 10, 2015
    Assignee: Digi International Inc.
    Inventor: Terry M. Schaffner
  • Publication number: 20150061920
    Abstract: The invention relates to a ranging system for measuring the distance between an interrogator and a transponder. The transponder includes: a signal receiver for receiving a challenge signal from an interrogator; a signal processor for processing the challenge signal and generating a response signal in response to the challenge signal; a buffer for storing the response signal generated by the signal processor; and a signal transmitter for sending the response signal stored in the buffer when the signal processor receives a ranging signal from the interrogator, wherein a time interval between the challenge signal and the ranging signal is known to both transponder and the interrogator.
    Type: Application
    Filed: April 28, 2014
    Publication date: March 5, 2015
    Applicant: Maxim Integrated Products, Inc.
    Inventors: Kourosh Pahlavan, Farokh Hassanzadeh Eskafi
  • Publication number: 20150054677
    Abstract: A method and apparatus for sensing boundaries between materials are provided. The method for sensing boundaries between materials comprises the steps of: fixing sensing modules in place; transmitting and receiving radio frequency signals; and analyzing radio frequency signals. The method enables real-time detection of positions of the boundaries between materials and handling and monitoring of changes in the boundary positions. The apparatus for sensing boundaries between materials comprises at least two sensing modules, or a radio frequency transmitting unit and a plurality of radio frequency signals receiving unit, or a plurality of radio frequency transmitting unit and a radio frequency signals receiving unit. The radio frequency signals are transmitted, received and analyzed by the radio frequency transmitting unit and the radio frequency signals receiving unit to determine the boundary positions and changes therein.
    Type: Application
    Filed: November 26, 2013
    Publication date: February 26, 2015
    Inventors: Chun-Ming HUANG, Chen-Chia Chen, Yung-Bin Lin, Chien-Ming Wu
  • Patent number: 8963770
    Abstract: The invention relates to a method for determining the distance between a radio beacon and a vehicle device passing in front of said radio beacon, in a road toll system. A signal of a frequency having a known temporal profile is emitted. Said method consists of the following steps: the signal is captured in the other component when passing and the temporal profile of the frequency is recorded in relation to the known temporal profile; a modification in the recorded frequency profile exceeding a first threshold value is detected; two distant wave zones in the frequency profile, lying temporally in front of and behind the detected modification, which displays a frequency modification below a second threshold value, are searched for; the recorded frequency profile is scaled in such a manner that the distance wave zones take the predetermined values; and said distance “a” from the scaled frequency path is determined.
    Type: Grant
    Filed: November 29, 2011
    Date of Patent: February 24, 2015
    Assignee: Kapsch TrafficCom AG
    Inventors: Dieter Smely, Josef Winkler, Oliver Nagy, Alexander Paier, Robert Povolny
  • Patent number: 8824325
    Abstract: A hybrid positioning system can be implemented to improve location estimation of a wireless network device when reference network devices can have different distance calibration constants. For each of a plurality of positions at which the wireless network device is placed and for each reference network device, a distance between the wireless network device and the reference network device is determined. A first positioning algorithm is executed to determine an intermediate location (corresponding to each position) of the wireless network device and a distance calibration constant for each reference network device based, in part, on a corresponding initial location of the wireless network device. A second positioning algorithm is executed to estimate a subset of the positions of the wireless network device based on the intermediate location (corresponding to the position) of the wireless network device and the distance calibration constant of each of reference network devices.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: September 2, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Xiaoxin Zhang, Ning Zhang
  • Patent number: 8823577
    Abstract: A distance separation tracking process is provided that includes the transmission of a periodic radio frequency original signal from a beacon transceiver. The original periodic signal from the beacon transceiver is received at a remote target transceiver as a target received periodic signal. The target retransmits the received periodic signal to the beacon transceiver as a return periodic signal. Data points of the return periodic signal are sampled and used to calculate a phase differential between the original periodic signal and the return periodic signal that correlates to the distance separation range between the beacon transceiver and the target transceiver.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: September 2, 2014
    Assignee: iTRACK, LLC
    Inventors: G. Edzko Smid, Thomas P. Stiglich
  • Publication number: 20140232588
    Abstract: A radio frequency ranging system is grounded in establishing and maintaining phase and frequency coherency of signals received by a slave unit from a master unit and retransmitted to the master unit by the slave unit. For a preferred embodiment of the invention, coherency is established through the use of a delta-sigma phase-lock loop, and maintained through the use, on both master and slave units, of thermally-insulated reference oscillators, which are highly stable over the short periods of time during which communications occur. A phase relationship counter is employed to keep track of the fractional time frames of the phase-lock loop as a function of the reference oscillator, thereby providing absolute phase information for an incoming burst on any channel, thereby enabling the system to almost instantaneously establish or reestablish the phase relationship of the local oscillator so that it synchronized with the reference oscillator.
    Type: Application
    Filed: April 29, 2014
    Publication date: August 21, 2014
    Applicant: Greina Technologies, Inc.
    Inventor: Daniel Joseph Lee
  • Publication number: 20140225762
    Abstract: A ranging and positioning system comprising transmitters and receiver nodes communicating together by chirp-modulated radio signals, that have a ranging mode in which ranging exchange of signals takes place between a master device and a slave device that leads to the evaluation of the range between them. The slave is arranged for recognizing a ranging request and transmit back a ranging response containing chirps that precisely aligned in time and frequency with the chirps in the ranging requests, whereupon the master can receive the ranging response, analyze the time and frequency the chirps contained therein with respect to his own time reference, and estimate a range to the slave.
    Type: Application
    Filed: February 3, 2014
    Publication date: August 14, 2014
    Inventor: Olivier B. A. SELLER
  • Patent number: 8742978
    Abstract: A method and an arrangement for determining the delay of a signal between a first station and a second station of the arrangement, with the aim of determining the spatial distance between the stations. A first series of first signal pulses is generated in the first station at a first pulse repetition rate f1. A second and a third series of second and third signal pulses is generated in the second station, comprising a second f2 and third pulse repetition rate f3, where f2=f1+?f and f3=f1??f. The second and third series of second and third signal pulses are transmitted to the first station, where the series are correlated with the first series of first signal pulses. The delay of the signal can be determined from the time elapsed between two successive pulses of the signal arising from the correlation.
    Type: Grant
    Filed: July 13, 2010
    Date of Patent: June 3, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: Roland Gierlich, Jörg Hüttner, Andreas Ziroff
  • Patent number: 8730094
    Abstract: A method and a radio beacon for determining a distance of a vehicle passing a radio beacon of a road toll system, from beacon. The vehicle is equipped with an onboard unit, which emits a signal with a known curve of its frequency over time. The method includes receiving the signal in the radio beacon during passage of the vehicle and recording a curve of its frequency over time in relation to the known frequency curve; detecting a change in the recorded frequency curve exceeding a predetermined threshold value; looking for two far regions in the frequency curve lying before and after the detected change in time and showing a frequency change below a threshold value; scaling the recorded frequency curve in such a manner that the far regions assume predetermined values; and determining the said distance from a gradient of the scaled frequency curve in an inflection point thereof.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: May 20, 2014
    Assignee: Kapsch TrafficCom AG
    Inventor: Oliver Nagy
  • Patent number: 8723720
    Abstract: The wireless detection beacon is for use with a Radio Frequency (RF) interrogator transmitting at a first frequency and receiving at a second frequency. The wireless detection beacon includes a substrate, a power supply carried by the substrate, an antenna assembly carried by the substrate, and a local oscillator (LO) carried by the substrate and configured to be powered by the power supply to provide an LO signal at a third frequency. A mixer is carried by the substrate and coupled to the antenna assembly and the LO. The mixer is configured to generate an outgoing beacon signal to the antenna assembly at the second frequency based upon mixing an incoming signal from the RF interrogator at the first frequency with the LO signal at the third frequency.
    Type: Grant
    Filed: May 3, 2011
    Date of Patent: May 13, 2014
    Assignee: Harris Corporation
    Inventors: Christopher Douglas Moffatt, James G. Tonti
  • Patent number: 8711032
    Abstract: A radio frequency ranging system is grounded in establishing and maintaining phase and frequency coherency of signals received by a slave unit from a master unit and retransmitted to the master unit by the slave unit. For a preferred embodiment of the invention, coherency is established through the use of a delta-sigma phase-lock loop, and maintained through the use, on both master and slave units, of thermally-insulated reference oscillators, which are highly stable over the short periods of time during which communications occur. A phase relationship counter is employed to keep track of the fractional time frames of the phase-lock loop as a function of the reference oscillator, thereby providing absolute phase information for an incoming burst on any channel, thereby enabling the system to almost instantaneously establish or reestablish the phase relationship of the local oscillator so that it synchronized with the reference oscillator.
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: April 29, 2014
    Assignee: Greina Technologies, Inc.
    Inventor: Daniel Joseph Lee
  • Patent number: 8704703
    Abstract: Methods and systems for post processing synchronization of bistatic radar data are disclosed. A transmitter is configured to transmit pulses at a first rate controlled by a first local oscillator. A receiver is configured to receive pulses at a second rate controlled by a second oscillator. A processing device is configured to synchronize, with respect to the first rate, in-phase quadrature data received from the receiver using a keystone formatting technique.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: April 22, 2014
    Assignee: The MITRE Corporation
    Inventor: Probal Kumar Sanyal
  • Publication number: 20140062761
    Abstract: A tag decides a response based on a plurality of queries received from a reader, determines whether to transmit the response, transmits the response to the reader according to the results of the determination, and transmits a message authentication code including communication content to the reader. The reader calculates a consumed time period which is the time difference between a transmission time at which the queries are transmitted and a reception time at which the response is received, calculates an average consumed time period of the consumed time period, and measures a distance to the tag based on the average consumed time period. Accordingly, it is possible to check an attacker's intervention with a high probability, thereby improving distance measurement performance. Also, the tag may efficiently perform computing and communication.
    Type: Application
    Filed: January 2, 2013
    Publication date: March 6, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventor: Electronics and Telecommunications Research Institute
  • Patent number: 8643536
    Abstract: A positioning system for radio frequency devices includes a two-way radio antenna, for vehicles, having a transmitting and a receiving element. Reference antennas have retro-directive arrays which can shape the signal beams in elevation; polarize transmission and reception signals according to a circular or a linear polarization, the polarized transmission retro-directively reflecting signals having the same polarization as the incident ones in the case of circular polarization, or retro-directively reflecting signals having orthogonal polarization in the case of linear polarization. An encoder is included for transmitting an identification code of the reference antenna. A controller processes the spatial and temporal data resulting from communication through the radio waves transmitted and received by the vehicle antennas and reflected by the reference antennas. The controller calculates the distance of the vehicle from the reference antennas that have reflected the signal transmitted by the antennas.
    Type: Grant
    Filed: February 2, 2010
    Date of Patent: February 4, 2014
    Assignee: Elettric 80 S.p.A.
    Inventors: Vittorio Cavirani, Francesco Trotta, Luca Marcaccioli, Roberto Vincenti Gatti, Franco Manzini, Domenico Di Terlizzi
  • Patent number: 8643538
    Abstract: A system and method for determining a position of a locus comprising a locator device for disposition at the locus; the locator device configured for receiving an electromagnetic signal from a beacon device, the locator device receiving at a distance from the beacon device within near field range of the electromagnetic signal; the locator device configured for distinguishing at least two characteristics of the electromagnetic signal sensed at the locus; the system employing the at least two characteristics to effect the determining of the position of the locus.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: February 4, 2014
    Assignee: Q-Track Corporation
    Inventors: Hans Gregory Schantz, Robert Edward DePierre, David Wesley Langford
  • Publication number: 20140022108
    Abstract: An apparatus includes a video encoder, a camera and radio frequency modulation circuitry. The radio frequency modulation circuitry is operative to modulate a radar signal to include video data. A radar transmitter is operatively coupled to the radio frequency modulation circuitry, and is operative to transmit a radar signal including the video data. The apparatus may also include radio frequency demodulation circuitry and a video decoder. The video decoder is operative to decode video data contained in a radar signal demodulated by the radio frequency demodulation circuitry. An inter-vehicle alert system controls the camera to initiate capturing video data which includes the video data. A method of operation modulates a radar signal to include at least a portion of the video data captured in response to detecting an obstruction, and transmits the radar signal to a second vehicle via an antenna array oriented at the moving vehicle's rear.
    Type: Application
    Filed: July 23, 2012
    Publication date: January 23, 2014
    Applicant: MOTOROLA MOBILITY LLC
    Inventors: William P. Alberth, JR., Dean E. Thorson
  • Patent number: 8620344
    Abstract: Methods, program products, and systems for location-based application program management are described. A mobile device can receive a first application program to be executed in an application subsystem. The first application program can be configured to be invoked or notified when the mobile device is located at a defined location. The mobile device can register the first application program to a second application program that executes in a baseband subsystem. The mobile device can set the application subsystem to a power-saving operating mode. The second application program can monitor a current location of the mobile device. When the mobile device is currently located at the defined location, the second application program can set the application subsystem to an active operating mode, and invoke the first application program.
    Type: Grant
    Filed: April 7, 2010
    Date of Patent: December 31, 2013
    Assignee: Apple Inc.
    Inventors: Ronald K. Huang, Morgan Grainger
  • Patent number: 8604964
    Abstract: A system for determining the movement of a swaying structure, on which a receiver is fixedly mounted, is proposed, wherein at least three reference transmitters having known and fixed positions are provided and transmit the transmission signals received by the receiver at defined carrier frequencies. In addition, an evaluation unit is provided, which determines measured phase values from the received signals, taking into account the defined carrier frequency, wherein the distance from the reference transmitters and the changes in position of the receiver and therefore of the swaying structure can be calculated from said phase values.
    Type: Grant
    Filed: October 14, 2009
    Date of Patent: December 10, 2013
    Assignee: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
    Inventors: Andreas Eidloth, Norbert Franke
  • Patent number: 8598501
    Abstract: A sensor system uses ground emitters to illuminate a projectile in flight with a polarized RF beam. By monitoring the polarization modulation of RF signals received from antenna elements mounted on the projectile, both angular orientation and angular rate signals can be derived and used in the inertial solution in place of the gyroscope. Depending on the spacing and positional accuracies of the RF ground emitters, position information of the projectile may also be derived, which eliminates the need for accelerometers. When RF signals of ground emitter/s are blocked from the guided projectile, the sensor deploys another plurality of RF antennas mounted on the projectile nose to determine position and velocity vectors and orientation of incoming targets.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: December 3, 2013
    Assignee: Northrop Grumman Guidance an Electronics Co., Inc.
    Inventors: A. Douglas Meyer, Mostafa A. Karam, Charles A. Lee, Charles H. Volk
  • Publication number: 20130265188
    Abstract: A radar device is provided. The radar device is installed in a movable body, transmits electromagnetic waves at a predetermined frequency, and receives response waves transmitted from a transponder device in response to the electromagnetic waves, respectively. The radar device includes a representative distance calculating module for calculating a representative distance from the radar device to the transponder device based on the response waves that are continuous over a predetermined azimuth angle range, a representative relative azimuth calculating module for calculating a representative relative azimuth of the transponder device from the radar device based on the continuous response waves, and a positioning module for calculating a location of the radar device based on positional information of the transponder device that is contained in each of the response waves, the calculated representative distance, and the calculated representative relative azimuth.
    Type: Application
    Filed: January 11, 2013
    Publication date: October 10, 2013
    Applicant: FURUNO ELECTRIC CO., LTD.
    Inventor: FURUNO Electric Co., Ltd.
  • Patent number: 8552903
    Abstract: Various techniques are described relating to verifying a distance between devices. A distance between two devices may be verified by requiring one of the devices to take one or more actions that generate a result that is only possible if the device is at most a given distance from the other device. In some aspects verified ranging is accomplished through the use of a ranging signal and a responsive signal. In some aspects the ranging signal may comprise a random, pseudorandom, or deterministic sequence. A responding device may operate on a ranging signal in accordance with a known function to generate a responsive signal. A ranging device also may perform operations to determine the likelihood that a responding device properly operated on a ranging signal that the ranging device transmitted to the responding device.
    Type: Grant
    Filed: April 16, 2007
    Date of Patent: October 8, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: David Jonathan Julian, Amal Ekbal, Chong U. Lee
  • Patent number: 8519884
    Abstract: Improved distance estimation of a selected transmitter. An improved distance estimate from a target transmitter to a receiver is produced by assessing the target transmitter to determine transmit power, and combining this information with a propagation model, received signal strength, and reference signal strength indications. Target transmit power may be assessed through knowledge of the target device or device class, and/or transmit power reporting features of target wireless networks. The assessment may be made through looking up reported target device characteristics in a database, making inferences based on target device characteristics, or through standards-based diagnostic and/or reporting mechanisms.
    Type: Grant
    Filed: July 29, 2008
    Date of Patent: August 27, 2013
    Assignee: Aruba Networks, Inc.
    Inventor: Joshua Wright
  • Patent number: 8482456
    Abstract: A microwave sensor assembly includes at least one probe including an emitter configured to generate an electromagnetic field from at least one microwave signal. The emitter is also configured to generate at least one loading signal representative of a loading induced within the emitter by an object positioned within the electromagnetic field. The microwave sensor assembly also includes a signal processing device coupled to the at least one probe. The signal processing device includes a linearizer configured to generate a substantially linear output signal based on the at least one loading signal.
    Type: Grant
    Filed: December 16, 2010
    Date of Patent: July 9, 2013
    Assignee: General Electric Company
    Inventors: Steven Go, Boris Leonid Sheikman, William Platt
  • Publication number: 20130154872
    Abstract: A method and apparatus are provided for locating an obstacle between a transmitter and a receiver. The method includes: determining at least one elliptical ring in which the obstacle is situated, the elliptical ring being defined by two confocal ellipses, having their focuses corresponding to the transmitter and to the receiver, each elliptical ring being associated with a physical echo generated by an obstacle; estimating a distance between the obstacle and a focus as a function of the separation between the confocal ellipses at the obstacle in a plane normal to the axis defined by the focuses so as to obtain a set of potential location zones for the obstacle in the elliptical ring; and lifting the ambiguity between the various potential location zones of the obstacle so as to deliver a location zone of the obstacle.
    Type: Application
    Filed: August 31, 2011
    Publication date: June 20, 2013
    Applicant: FRANCE TELECOM
    Inventors: Isabelle Siaud, Anne-Marie Ulmer-Moll
  • Patent number: 8405543
    Abstract: A circuit of a node of a radio network, and a method for distance measurement with a transceiver for receiving a first signal with a first frequency by downmixing to an intermediate frequency, with a phase measurement unit, which is set up to determine a first value of a first phase for a first frequency value of the first frequency. The transceiver is formed to transmit a second signal with a first frequency value of a second frequency for determining a first value of a second phase. The control circuit is set up to change the first frequency and the second frequency, in that a second frequency value of the first frequency and the first frequency value of the first frequency have a frequency difference, and whereby a second frequency value of the second frequency and the first frequency value of the second frequency have the frequency difference. The phase measurement unit is set up to determine a second value of the first phase for the second frequency value of the first frequency.
    Type: Grant
    Filed: December 29, 2009
    Date of Patent: March 26, 2013
    Assignee: Atmel Corporation
    Inventors: Wolfram Kluge, Eric Sachse
  • Patent number: 8350750
    Abstract: A distributed time reversal mirror array (DTRMA) system includes a plurality of independent, sparsely distributed time reversal mirrors (TRMs). Each of the TRMs includes an antenna; a transceiver connected to the antenna for transmitting a signal toward a target, for receiving a return, reflected signal from the target, and for retransmitting a time-reversed signal toward the target: means for phase-locking and for maintaining spatial and temporal coherences between the TRMs; and a computer including a machine-readable storage media having programmed instructions stored thereon for computing and generating the time-reversed retransmitted signal, thereby providing a phased array functionality for the DTRMA while minimizing distortion from external sources. The DTRMA is capable of operating in an autonomous, unattended, and passive state, owing to the time-reversal's self-focusing feature. The beam may be sharply focused on the target due to the coherently synthesized extended aperture over the entire array.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: January 8, 2013
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Eung Gi Paek, Joon Y Choe
  • Patent number: 8334801
    Abstract: A locating system, includes at least one initiator configured to operate at a first clock frequency, and to transmit a measurement signal including a first preamble; and at least one transponder configured to operate at a second clock frequency, to receive the measurement signal, and to transmit a response signal to the initiator, the response signal including a second preamble. The initiator is further configured to calculate, based on the response signal, a distance between the initiator and the transponder for determining a location of the transponder.
    Type: Grant
    Filed: July 26, 2010
    Date of Patent: December 18, 2012
    Assignee: Ensco, Inc.
    Inventors: Russell Alan Fretenburg, Steven Scott Kazemir, Henry Hon-You Leung, Derek John Pyner, Charles Elmer McNeill, IV, David W. A. Taylor, Jr.
  • Patent number: 8326320
    Abstract: The present invention relates to a method for locating at least one mobile radio subscriber in a mobile radio network, wherein to each transmitting station a value correlated with the receive field strength of a signal from this transmitting station is allocated; including the following steps: a) from the information determined upon connection setup, a table is created per cell, in which at least one distance parameter to the transmitting station of the cell is allocated to the respective receive field strengths; b) for at least one value correlated with the receive field strength and transmitted in the measurement report, the allocated distance parameter to the transmitting station of the respective cell is read out from the table created in step a); and c) determining at least one point satisfying the distance parameter(s) read-out in step b).
    Type: Grant
    Filed: August 26, 2009
    Date of Patent: December 4, 2012
    Assignee: Tektronix, Inc.
    Inventors: Karsten Gaenger, Jens Plogsties, Ralf Kreher, Armin Klopfer
  • Patent number: 8320934
    Abstract: A system and method of dynamically updating an almanac of base stations with wireless phones that are controlled by end users. First, second, and third location information are received respectfully from a first, second, and third wireless phones. A position of each wireless device is known. The distance between each wireless device an uncooperative base station is determined while accounting for an uncertainty factor. A location of the uncooperative base station is calculated using the first, second, and third location information and the distances. The almanac is updated with the location.
    Type: Grant
    Filed: August 3, 2007
    Date of Patent: November 27, 2012
    Assignee: QUALCOMM Incorporated
    Inventor: Leonid Sheynblat
  • Patent number: 8279111
    Abstract: A high-precision distance measuring with a reduced error in a distance measuring system which calculates a distance from an arrival time of each pulse signal constituting a pulse sequence is provided. For an oscillator which generates pulse signals by counting the number of pulse signals constituting a received pulse sequence, a relative time difference between a transmitting device and a return device is acquired, a distance from the transmitting device to the return device is calculated, and the calculated distance is corrected based on the calculated relative time difference.
    Type: Grant
    Filed: February 9, 2007
    Date of Patent: October 2, 2012
    Assignee: National Institute of Information and Communications Technology
    Inventors: Bin Zhen, Huan-Bang Li, Ryuji Kohno