公开(公告)号：US10718198B2

公开(公告)日：2020-07-21

申请号：US15823489

申请日：2017-11-27

Applicant: HRL Laboratories, LLC

Inventor： Logan D. Sorenson ,  Shuoqin Wang ,  David L. Walter ,  Adour V. Kabakian ,  Keerti S. Kona ,  Hung Nguyen ,  Raviv Perahia ,  David Chang

IPC: E21B44/00 ,  E21B47/04 ,  E21B47/022 ,  G01C21/16 ,  E21B41/00 ,  G01R33/02

Abstract: Described is a system for estimating a trajectory of a borehole. The system processes signals of sensor streams obtained from an inertial sensor system. Using the set of processed signals, the system determines whether a drill is in a survey mode state or a continuous mode state, and a measured depth of the borehole is determined. A set of survey mode positioning algorithms is applied when the drill is stationary. A set of continuous mode navigation algorithms is applied when the drill is non-stationary. Using at least one Kalman filter, results of the set of survey mode positioning algorithms and the set of continuous mode navigation algorithms are combined. An estimate of a borehole trajectory and corresponding ellipse of uncertainty (EOU) is generated using the combined results.

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：US10308505B1

公开(公告)日：2019-06-04

申请号：US14456808

申请日：2014-08-11

Applicant: HRL LABORATORIES LLC

Inventor： Deborah J. Kirby ,  Raviv Perahia ,  Hung Nguyen ,  Frederic P. Stratton ,  David T. Chang

IPC: B81B3/00 ,  B81C1/00 ,  G01C21/18

Abstract: A device preferably for use in an inertial navigation system the device having a single IC wafer; a plurality of sensors bonded to bond regions on said single IC wafer, at least one of said bond regions including an opening therein in gaseous communication with a pressure chamber associated with at least one of the plurality of said sensors; and a plurality of caps encapsulating said plurality of sensors, at least one of said plurality of caps forming at least a portion of said pressure chamber. A method of making the device is also disclosed.

公开(公告)号：US10236858B1

公开(公告)日：2019-03-19

申请号：US14836462

申请日：2015-08-26

Applicant: HRL LABORATORIES, LLC

Inventor： Logan Sorenson ,  Raviv Perahia ,  Hung Nguyen ,  David Chang

IPC: H03H9/02 ,  H01L41/047 ,  H01L41/113 ,  H03H9/17 ,  H03H9/25 ,  H03F3/45

Abstract: An electromechanical resonator including a drive electrode set having at least one pair of alternating pole interdigitated drive electrodes and including a sense electrode set having at least one pair of alternating pole interdigitated sense electrodes.

公开(公告)号：US10141906B1

公开(公告)日：2018-11-27

申请号：US15149026

申请日：2016-05-06

Applicant: HRL LABORATORIES LLC

Inventor： David T. Chang ,  Frederic P. Stratton ,  Hung Nguyen ,  Randall L. Kubena

IPC: H03H3/02 ,  H03H9/19 ,  H03H3/007 ,  H03H9/15

Abstract: A method of fabricating a resonator includes providing a first quartz substrate, forming a metallic etch stop on a first surface of the first quartz substrate; attaching, using a temporary adhesive, the first surface of the first quartz substrate to a second quartz substrate, etching an opening for a via in a second surface of the first quartz substrate to the metallic etch stop, forming a metal electrode on the second surface of the first quartz substrate, the metal electrode penetrating the via in the first quartz substrate to make ohmic contact with the metallic etch stop, bonding the metal electrode formed on the second surface of the first quartz substrate to a pad formed on a host substrate; and dissolving the temporary adhesive to release the second quartz substrate from the first quartz substrate, wherein the first quartz substrate and the host substrate each comprise crystalline quartz.

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：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：US11493534B1

公开(公告)日：2022-11-08

申请号：US16673878

申请日：2019-11-04

Applicant: HRL Laboratories, LLC

Inventor： Logan D. Sorenson ,  Lian X. Huang ,  Matthew J. Pelliccione ,  Raviv Perahia ,  Hung Nguyen ,  David T. Chang

IPC: G01P21/00 ,  B81B3/00 ,  G01P15/08

Abstract: A self-calibration method for an accelerometer having a proof mass separated by a gap from a drive electrode and a sense electrode includes initializing the accelerometer to resonate, applying a first bias voltage to the sense electrode and a second bias voltage to the drive electrode to obtain a first scale factor, measuring a first acceleration over a first time interval, swapping the first bias voltage on the sense electrode with the second bias voltage previously on the drive electrode and the second bias voltage on the drive electrode with the first bias voltage previously on the sense electrode so that a bias voltage on the sense electrode is set to the second bias voltage and a bias voltage on the drive electrode is set to the second bias voltage to obtain a second scale factor, measuring a second acceleration over a second time interval, and calculating a true acceleration.