Patents Assigned to NEXTNAV, LLC
  • Patent number: 10288424
    Abstract: Improving an estimated altitude of a receiver by mitigating the effects of transmitter heating. Systems and methods for improving estimates of a receiver's altitude determine a reference pressure at a reference altitude using a temperature measured at a transmitter or another temperature value, an altitude of the transmitter, and a pressure measured by the transmitter or another pressure value. A local reference pressure for a receiver is determined using the reference pressure and other reference pressures from other transmitters. Reference pressures from overheating transmitters may be weighted less than reference pressures from other transmitters when determining the local reference pressure. The local reference pressure is then used to estimate the altitude of the receiver.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: May 14, 2019
    Assignee: NextNav, LLC
    Inventors: Michael Dormody, Thomas Wolf, Arun Raghupathy, Andrew Sendonaris
  • Publication number: 20190141635
    Abstract: Reducing power consumption of a receiver in association with estimating the receiver's position using ranging signals. Systems and methods may determine power reduction strategy information, identify a power reduction strategy using the determined power reduction strategy information, and place one or more modules of the receiver into a reduced power state using the identified power reduction strategy. The power reduction strategy may result in powering off different circuitry of the receiver at different times, and under different circumstances.
    Type: Application
    Filed: December 14, 2018
    Publication date: May 9, 2019
    Applicant: NextNav, LLC
    Inventors: ARUN RAGHUPATHY, SUBRAMANIAN S. MEIYAPPAN
  • Patent number: 10281556
    Abstract: Detecting and mitigating the effects of interference in a positioning system. A received signal is divided into a plurality of receive signal time/frequency (RSTF) values. A plurality of threshold values are determined based on expected energy values for the received signal. In one implementation, if a predetermined number of the RSTF values are above the threshold, the received signal is determined to be corrupt.
    Type: Grant
    Filed: October 7, 2016
    Date of Patent: May 7, 2019
    Assignee: NextNav, LLC
    Inventors: Mir Hamza Mahmood, Arun Raghupathy, Andrew Sendonaris
  • Patent number: 10254379
    Abstract: Estimating a position of a mobile device. Particular systems and methods for estimating a position of a mobile device using information from two positioning technologies determine different position estimates for the mobile device using different positioning technologies, and determine a final position estimate for the mobile device using a weighted combination of the different position estimates. In some implementations, the weighted combination is a weighted average or a weighted median of the different position estimates. Weights may be determined using respective uncertainty metrics corresponding to the respective position estimates.
    Type: Grant
    Filed: January 22, 2018
    Date of Patent: April 9, 2019
    Assignee: NextNav, LLC
    Inventors: Andrew Sendonaris, Sameet Deshpande, Mir Hamza Mahmood
  • Patent number: 10241190
    Abstract: Estimating one or more positions of a receiver using one or more anchor points. Systems and methods for estimating a position of a receiver using a particular anchor point may identify an area of interest that includes anchor points, identify the particular anchor point, and then use information about the particular anchor point to estimate the position of the receiver.
    Type: Grant
    Filed: September 16, 2016
    Date of Patent: March 26, 2019
    Assignee: NextNav, LLC
    Inventors: Andrew Sendonaris, Mir Mahmood
  • Patent number: 10231201
    Abstract: Synchronizing the local time of beacons. Systems and methods discipline a high-stability local clock of a designated beacon within a geographic region to a network time, and synchronize a local clock of another beacon within the geographic region to the network time.
    Type: Grant
    Filed: April 25, 2017
    Date of Patent: March 12, 2019
    Assignee: NextNav, LLC
    Inventors: Subramanian S. Meiyappan, Wouter Pelgrum, Arun Raghupathy
  • Patent number: 10203397
    Abstract: Devices, systems, and methods for improving performance in positioning systems. Performance may be improved using disclosed signal processing methods for separating eigenvalues corresponding to noise and eigenvalues corresponding to one or more direct path signal components or multipath signal components.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: February 12, 2019
    Assignee: NextNav, LLC
    Inventors: Andrew Sendonaris, Norman F. Krasner, Jagadish Venkataraman, Chen Meng
  • Patent number: 10194269
    Abstract: Estimating the position of a receiver using positioning signals and Doppler frequency measurements. Approaches for estimating the position of a receiver using positioning signals and Doppler frequency shift measurements determine an initial estimate of a receiver's position using ranging signals from a first system, generate Doppler frequency shift measurements using the Doppler positioning signals from a second system, and refine the initial estimate using the Doppler frequency shift measurements.
    Type: Grant
    Filed: October 7, 2016
    Date of Patent: January 29, 2019
    Assignee: NextNav, LLC
    Inventors: Jagadish Venkataraman, Chen Meng
  • Patent number: 10194395
    Abstract: Reducing power consumption of a receiver in association with estimating the receiver's position using ranging signals. Systems and methods may determine power reduction strategy information, identify a power reduction strategy using the determined power reduction strategy information, and place one or more modules of the receiver into a reduced power state using the identified power reduction strategy. The power reduction strategy may result in powering off different circuitry of the receiver at different times, and under different circumstances.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: January 29, 2019
    Assignee: NextNav, LLC
    Inventors: Arun Raghupathy, Subramanian S. Meiyappan
  • Patent number: 10175945
    Abstract: Systems and methods for improving correlation. In at least one system and method, a signal is received and divided into a plurality of slices. Each of the slices is divided into a plurality of sub-slices. A plurality of chips of a PN code are generated, and sub-slice correlation results are generated in parallel. Summation of the sub-slice correlation results generates a slice correlation results, and the accumulated slice correlation results provide a correlation result.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: January 8, 2019
    Assignee: NextNav, LLC
    Inventors: Vikram V. Kalkunte, Subramanian S. Meiyappan
  • Patent number: 10175364
    Abstract: Systems and methods for estimating whether a receiver is indoors or outdoors. Certain approaches evaluate data associated with a network of beacons to determine whether the receiver is indoors or outdoors. Such evaluation may include any of determining whether azimuthal angles corresponding to the beacons meet an azimuthal angle condition, determining whether elevation angles corresponding to the beacons meet an elevation angle condition, determining whether signal strengths corresponding to the beacons meet a signal strength condition, and determining whether other measurements associated with the beacons meet other measurement conditions.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: January 8, 2019
    Assignee: NextNav, LLC
    Inventors: Jagadish Venkataraman, Ganesh Pattabiraman
  • Patent number: 10064017
    Abstract: Determining building weather profile parameters, and correcting an estimated altitude of a receiver using the building weather profile parameters. Systems and methods for estimating an altitude of a receiver using building weather profile parameters may identify one or more weather profile parameters for a building, determine an initial estimate of a receiver's altitude at a floor inside the building, and use the initial estimate and the identified weather profile parameters to determine a corrected estimate of the receiver's altitude at the floor.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: August 28, 2018
    Assignee: NextNav, LLC
    Inventors: Guiyuan Han, Michael Dormody, Thomas Wolf, Ganesh Pattabiraman
  • Patent number: 10024972
    Abstract: A position location system comprises transmitters that broadcast positioning signals. Each broadcasted positioning signal comprises a pseudorandom ranging signal. The position location system includes a remote receiver that acquires and measures the time of arrival of the positioning signals received at the remote receiver. During an interval of time, at least two positioning signals are transmitted concurrently by the transmitters and received concurrently at the remote receiver. The two positioning signals have carrier frequencies offset from one another by an offset that is less than approximately twenty-five percent of the bandwidth of each positioning signal of the two positioning signals. Cross-interference between the positioning signals is reduced by tuning the remote receiver to a frequency of a selected signal of the two positioning signals and correlating the selected signal with a reference pseudorandom ranging signal matched to a transmitted pseudorandom ranging signal of the selected signal.
    Type: Grant
    Filed: May 17, 2016
    Date of Patent: July 17, 2018
    Assignee: NextNav, LLC
    Inventors: Arun Raghupathy, Norman F. Krasner
  • Patent number: 9998874
    Abstract: Using estimates of a receiver's altitude to determine where a receiver is located and to refine a positioning system's estimate of a receiver's position. Systems and methods determine whether a receiver is inside or outside a building, and may use the determination to confirm or adjust an initial estimate of the receiver's position. Various approaches for making the determination and for assessing the initial estimate of the receiver's position are described.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: June 12, 2018
    Assignee: NextNav, LLC
    Inventors: Andrew Sendonaris, Arun Raghupathy, Deepak Joseph
  • Patent number: 9992761
    Abstract: Transmitting information used to estimate a position of a mobile device. This disclosure describes NEAD-based and external location server (ELS)-based positioning systems and methods that determine when an identifier of a mobile device is not known or when the identifier of the mobile device is known but cannot be detected during a search by reference points, and to then provide a location of a reference point that had previous contact with the mobile device instead of an estimated position of the mobile device. The provided location of the reference point can be used by a location server to generate an estimate of mobile device position.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: June 5, 2018
    Assignee: NextNav, LLC
    Inventor: William M. Shvodian
  • Patent number: 9980246
    Abstract: Acquiring three-dimensional location information, and using acquired three-dimension location information to locate users and enhance their experience in relation to location-based services.
    Type: Grant
    Filed: March 17, 2016
    Date of Patent: May 22, 2018
    Assignee: NextNav, LLC
    Inventors: Ganesh Pattabiraman, Deepak Joseph
  • Patent number: 9973234
    Abstract: Systems and methods for improving performance in terrestrial and satellite positioning systems. Signal processing systems and methods are described for selecting, from among a set of codes, certain codes having desired autocorrelation and/or cross-correlation properties. Systems and methods for generating, encoding, transmitting, and receiving signals using the selected codes are also described.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: May 15, 2018
    Assignee: NextNav, LLC
    Inventors: Norman F. Krasner, Arun Raghupathy, Bhaskar Nallapureddy
  • Patent number: 9971018
    Abstract: An interference removal filter that includes a combination of a first filter and a second filter, where the first filter passes signals over a frequency range of size B with a variation of less than +/?3 dB, where the peak value of the impulse response of the second filter is displaced in time from the peak value of the impulse response of the first filter by at least 2/B time units, and where the combination of the first filter and the second filter produces a notch in frequency at a frequency location within the frequency range.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: May 15, 2018
    Assignee: NextNav, LLC
    Inventor: Norman F. Krasner
  • Patent number: 9967845
    Abstract: Synchronizing the local time of beacons using two way time transfer methods and hardware enabling such methods. Certain systems incorporate receive hardware into beacon circuitry used for transmitting signals so that the beacon can transmit RF signals during transmission periods, and can also receive RF signals from other beacons during non-transmission periods. Receive hardware may be incorporated into beacon circuitry such that the beacon receives an incoming signal and passes that incoming signal to a digital pre-distortion linearization module, which can process that received signal. Methods for controlling whether a beacon transmits RF signals or receives RF signals are also discussed, as are methods for using RF signals received from other beacons for synchronization.
    Type: Grant
    Filed: November 30, 2015
    Date of Patent: May 8, 2018
    Assignee: NextNav, LLC
    Inventors: Arun Raghupathy, Subramanian S. Meiyappan
  • Patent number: 9964647
    Abstract: Described are systems and methods for estimating a position of receiver using ranging signals from different regions in a network of transmitters. In some embodiments, each ranging signal that exceeds a quality criterion is assigned to one of several defined regions based on a characteristic of that ranging signal. A maximum number of ranging signals per region may be selected and used during trilateration.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: May 8, 2018
    Assignee: NextNav, LLC
    Inventors: Andrew Sendonaris, Norman F. Krasner