公开(公告)号：US10571267B1

公开(公告)日：2020-02-25

申请号：US15253704

申请日：2016-08-31

Applicant: HRL Laboratories, LLC

Inventor： Logan D. Sorenson ,  Raviv Perahia ,  David T. Chang ,  Randall L. Kubena ,  Deborah J. Kirby ,  Hung Nguyen ,  Richard J. Joyce

IPC: G01C25/00 ,  G01C19/5776 ,  G01C19/5684 ,  H03L7/26 ,  H03G3/20

Abstract: An angular rate sensor. The sensor includes a Coriolis vibratory gyroscope (CVG) resonator, configured to oscillate in a first normal mode and in a second normal mode; a frequency reference configured to generate a reference signal; and a first phase control circuit. The first phase control circuit is configured to: measure a first phase difference between: a first phase target, and the difference between: a phase of an oscillation of the first normal mode and a phase of the reference signal. The first phase control circuit is further configured to apply a first phase correction signal to the CVG resonator, to reduce the first phase difference. A second phase control circuit is similarly configured to apply a second phase correction signal to the CVG resonator, to reduce a corresponding, second phase difference.

公开(公告)号：US10514261B2

公开(公告)日：2019-12-24

申请号：US15387435

申请日：2016-12-21

Applicant: HRL Laboratories, LLC

Inventor： Logan D. Sorenson ,  Hung Nguyen ,  Raviv Perahia ,  Deborah J. Kirby ,  Richard J. Joyce ,  David T. Chang

IPC: G01C21/08 ,  G01R33/02 ,  G01V7/00

Abstract: A geopositioning system. The geopositioning system includes an accelerometer including three sensing axes, a gyroscope including three sensing axes, and a magnetometer including three sensing axes, and a processing circuit. The processing circuit is configured to calculate a location of the geopositioning system as a latitude, longitude, and altitude with respect to the Earth.

公开(公告)号：US20190305749A1

公开(公告)日：2019-10-03

申请号：US16368802

申请日：2019-03-28

Applicant: HRL Laboratories, LLC

Inventor： Raviv PERAHIA ,  Logan D. Sorenson ,  Lian X. Huang ,  Jeremy Bregman

IPC: H03H9/05 ,  H03H9/02 ,  H03H9/13 ,  H03H9/17

Abstract: A resonator has a resonator body and a frame at least partially surrounding the resonator body, the resonator body being coupled to the frame by at least one tether. The resonator body, frame and at least one tether comprise silicon carbide. A plurality of interdigitated electrodes are disposed on the silicon carbide resonator body. The resonator body preferably comprises 6H silicon carbide and preferably has a crystalline c-axis oriented generally parallel to a thickness direction of the resonator body.

公开(公告)号：US20190169979A1

公开(公告)日：2019-06-06

申请号：US16208449

申请日：2018-12-03

Applicant: HRL Laboratories, LLC

Inventor： Hung NGUYEN ,  Logan D. Sorenson ,  David L. Walter ,  Adour V. Kabakian ,  Raviv Perahia ,  Shuoqin Wang ,  David W. Shahan ,  Lian X. Huang ,  David T. Chang

IPC: E21B47/09 ,  E21B41/00 ,  G01P15/18 ,  G01P15/14 ,  G01P15/105

Abstract: An instrument package for use during the drilling a wellbore. The instrument package includes a plurality of instruments such as accelerometers, gyroscopes, and magnetometers; a computer is configured to determine the current position of the plurality of instruments from a set of measurements produced by the plurality of instruments; and wherein the plurality of instruments are mechanically isolated from a drill head assembly by one or more multi-degree of freedom vibration isolators. The computer preferably has at least two modes different analytical modes of analyzing the set of measurements produced by the plurality of instruments, including a continuous mode and a survey mode, the continuous mode being operational during times that active drilling is occurring and the survey mode being operational during times that the active drilling is not occurring.

公开(公告)号：US20180274355A1

公开(公告)日：2018-09-27

申请号：US15881700

申请日：2018-01-26

Applicant: HRL Laboratories, LLC

Inventor： Keerti S. Kona ,  Logan D. Sorenson ,  Raviv Perahia ,  Hung Nguyen ,  David Chang

IPC: E21B47/04 ,  E21B47/18 ,  E21B47/06

CPC classification number: E21B47/04 ,  E21B47/02208 ,  E21B47/06 ,  E21B47/065 ,  E21B47/18

Abstract: Described is a system for estimating measured depth of a borehole. The system comprises a drilling fluid pulse telemetry system positioned in a borehole and processors connected with the drilling fluid pulse telemetry system. Time series measures are obtained from an environmental sensor package. Initial estimates of a time delay and path attenuation amplitude are determined. An error for the initial estimates is determined, and iterative minimization of the error is performed until source signal parameters converge, resulting in a least squares estimate of the source signal and the reflected signals. The least squares estimate is used to obtain time delay values, which are then used to continuously generate an estimate of a measured depth of the borehole.

公开(公告)号：US20180252550A1

公开(公告)日：2018-09-06

申请号：US15897907

申请日：2018-02-15

Applicant: HRL Laboratories, LLC

Inventor： Adour V. Kabakian ,  Shuoqin Wang ,  Logan D. Sorenson ,  Hung Nguyen ,  Raviv Perahia

IPC: G01C25/00 ,  G01P21/00

CPC classification number: G01C25/00 ,  G01C25/005 ,  G01P15/18 ,  G01P21/00 ,  G01R33/0035 ,  G01R33/0206 ,  G01R35/00 ,  G01V13/00

Abstract: Described is a system for adaptive calibration of a sensor of an inertial measurement unit. Following each sensor measurement, the system performs automatic calibration of a multi-axis sensor. A reliability of a current calibration is assessed. If the current calibration is reliable, then bias and scale factor values are updated according to the most recent sensor measurement, resulting in updated bias and scale factor values. If the current calibration is not reliable, then previous bias and scale factor values are used. The system causes automatic calibration of the multi-axis sensor using either the updated or previous bias and scale factor values.

公开(公告)号：US10056913B1

公开(公告)日：2018-08-21

申请号：US14879510

申请日：2015-10-09

Applicant: HRL Laboratories, LLC

Inventor： Christopher S. Roper ,  Logan D. Sorenson ,  Matthew T. Rakher

IPC: H03L7/26

CPC classification number: G04F5/14 ,  G01C19/62

Abstract: A vapor-cell system and method is provided, comprising an enclosed vapor-cell region containing a vapor-cell gas phase comprising a vapor-cell alkali or alkaline earth metal, wherein the vapor-cell region is configured to allow at least one vapor-cell optical path through the vapor-cell gas phase; an enclosed reservoir region containing a reservoir alkali or alkaline earth metal, wherein the reservoir region is in vapor isolation from the vapor-cell region; a solid electrolyte disposed in ionic communication between the vapor-cell region and the reservoir region; a first electrode disposed between the solid electrolyte and the vapor-cell region; and a second electrode disposed between the solid electrolyte and the reservoir region, wherein the second electrode is electrically isolated from the first electrode. This vapor-cell system enables independent control of the alkali or alkaline earth vapor pressure in the vapor cell. The principles disclosed herein can improve long-term frequency stability in systems having vapor cells.

公开(公告)号：US10031191B1

公开(公告)日：2018-07-24

申请号：US14997423

申请日：2016-01-15

Applicant: HRL Laboratories, LLC

Inventor： Hung Nguyen ,  Logan D. Sorenson ,  Raviv Perahia ,  David T. Chang ,  Joshua A. Erbland

IPC: G01R33/028

CPC classification number: G01R33/0286 ,  G01R33/0283

Abstract: A magnetometer comprising a resonating structure which is naturally resonant in at least three resonant modes, a resonant frequency of the three modes being sufficiently separated to allow of detection of same, the resonating structure having two sense electrodes disposed on opposing major surfaces of the resonating structure and having a conductive path formed as a loop, the loop being disposed near or at edges of the resonating structure and the two sense electrodes being formed inwardly of the edges of the resonating structure and also inwardly of the loop.

公开(公告)号：US09825610B1

公开(公告)日：2017-11-21

申请号：US14634565

申请日：2015-02-27

Applicant: HRL Laboratories, LLC

Inventor： Christopher B. Churchill ,  Geoffrey P. McKnight ,  Raviv Perahia ,  Logan D. Sorenson ,  Guillermo Herrera

IPC: H03H9/46 ,  H03H9/24

CPC classification number: H03H9/46 ,  H03H9/2457 ,  H03H9/2463 ,  H03H9/462 ,  H03H2009/02165

Abstract: In an embodiment, a tunable stiffness mechanical filter is provided including an input coupler to a negative stiffness structure with a negative stiffness characteristic, and further including a tuner for tuning the negative stiffness structure. An output sensor is located along the negative stiffness structure. The filter may include an amplifier and/or a driver coupled between the output sensor and the negative stiffness structure.