Ensco, Inc.

Hawkeye 360, Inc.

Setter Research, Inc.

Edward Joseph Kreinar

David W A Taylor, Jr

Bradley David Farnsworth

Timothy James O'Shea

Nicholas Aaron McCarthy

William Todd Faulkner

Robert Barlow Alwood

Daniel Thomas Goff

W Todd Faulkner

Darek Kawamoto

Nicholas Aaron Mccarthy

Aspects of the present disclosure describe a system and method for synchronizing time, frequency, and phase among a plurality of devices.

Systems and methods for synchronizing time, frequency, and phase among a plurality of devices

A method includes obtaining signal information corresponding to a plurality of radio signals received at two or more sensing devices from a candidate location, determining a plurality of reconstructed signals based on the signal information, determining time-estimates and frequency-estimates based on a correlation between the plurality of radio signals and the plurality of reconstructed signals, determining metadata corresponding to the plurality of radio signals based on the signal information, the time-estimates, or the frequency-estimates, transmitting at least a portion of the metadata to an information combining node, obtaining the portion of the metadata from the information combining node, determining a relationship between the metadata, and determining the candidate location based on the metadata and the relationship between the metadata. Transmission of the plurality of radio signals to the information combining node is restricted based on a bandwidth of the two or more sensing devices or the information combining node.

Metadata-based emitter localization

The subject matter described herein includes methods and systems for performing physical measurements using radio frequency (RF) signals. According to one embodiment of the present invention, a method is disclosed for determining the distance between a first radio device and a second radio device. The method includes transmitting a radio frequency (RF) signal from the first radio device and receiving the RF signal by the second radio device. The method further includes a determining a carrier frequency of the RF signal and determining a slope of a carrier phase versus the carrier frequency corresponding to a rate of change of the carrier phase with the carrier frequency. The method also includes determining a physical distance between the first radio device and the second radio device based on the slope; wherein the physical distance is proportional to the slope plus an integer ambiguity term and a bias term.

Methods and systems for performing physical measurements using radio frequency (RF) signals

Systems and methods for performing distance and velocity measurements, such as by using carrier signals, are disclosed. A measurement system device may include a first antenna configured to receive a first signal from a transmitting device, the first signal having a carrier frequency, and a second antenna configured to receive the first signal from the transmitting device. The measurement system device may also include a processor configured to determine a first differential distance between the first antenna and the second antenna from the transmitting device and to determine a rate of change of the first differential distance. The processor may also be configured to estimate a geometry of the measurement system device relative to the transmitting device using the rate of change of the first differential distance.

Carrier phase distance and velocity measurements

Systems and methods for performing distance and velocity measurements, such as by using carrier signals, are disclosed. A measurement method may include transmitting a first signal from an originator device to a transponder device and determining a carrier phase of the first signal at the transponder device. The measurement method may also include transmitting a second signal from the transponder device to the originator device and determining a carrier phase of the second signal at the originator device. The measurement method may include estimating a relative distance between the originator device and the transponder device using the carrier phase of the first carrier signal, the carrier phase of the second carrier signal. The method may also include estimating the relative distance using a frequency difference. The method may include using an adjusted relative distance to determine a total distance between the originator device and the transponder device.

Unwrapping and prediction of distance and velocity measurements using carrier signals

Systems and methods for performing distance and velocity measurements, such as by using carrier signals, are disclosed. A measurement method may include transmitting a first signal from an originator device to a transponder device, the first signal having a first carrier frequency; and determining a carrier phase of the first signal at the transponder device. The method may include transmitting a second signal from the transponder device to the originator device, the second signal having a second carrier frequency; and determining a carrier phase of the second signal at the originator device. The method may include estimating a distance between the originator device and the transponder device using the carrier phase of the first carrier signal and the carrier phase of the second carrier signal. The method may include estimating the distance between the originator device and the transponder device using a frequency difference between the first carrier frequency and the second carrier frequency.

Growing community of inventors

Springfield, VA, United States of America

Edward Joseph Kreinar