公开(公告)号：US11747512B1

公开(公告)日：2023-09-05

申请号：US16932447

申请日：2020-07-17

Applicant: HRL Laboratories, LLC

Inventor： Randall L. Kubena ,  Logan D. Sorenson

IPC: G01V7/00 ,  G01V7/04

CPC classification number: G01V7/005 ,  G01V7/04

Abstract: A method and apparatus for for sensing a change in an acceleration gradient δa(t) between two gravity fields a1(t) and a2(t) respectively sensed by the first and second proof masses, the first and second proof masses either being coupled only to a first resonator or being individually coupled to first and second resonators, the first resonator generating, in use, a signal at a frequency fD which is applied said second resonator, the second resonator being driven, in use, into a non-linear state corresponding to a modal resonant frequency fΘ wherein it generates a comb of frequencies each tooth of which is separated from each other by a frequency Δ which is frequency-wise proportional a frequency difference between fD and fΘ and also proportional to the change in said acceleration gradient δa(t), circuitry for selecting an nth tooth in said comb of frequencies where the frequency of the nth tooth is equal to fD+nΔ, circuitry for detecting a change in the frequency of the nth tooth and for generating a signal that is proportional to n times the change in an acceleration gradient δa(t).

公开(公告)号：US11509277B2

公开(公告)日：2022-11-22

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: H03H3/02 ,  H03H9/205 ,  H03H9/02 ,  H03H9/05 ,  H03H9/13 ,  H03H9/17 ,  H03H9/15

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：US10914585B1

公开(公告)日：2021-02-09

申请号：US16871497

申请日：2020-05-11

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: G01C19/5726 ,  G01C19/5755

Abstract: A sensor includes an acceleration or magnetic field sensitive microelectromechanical systems (MEMS) resonator, configured to oscillate in at least a first normal mode and a second normal mode. The sensor further includes: a coarse readout circuit configured to drive the first normal mode, measure a motion of the first normal mode, and derive from the measured motion a coarse measurement of the true acceleration or true external magnetic field; and a fine readout circuit configured to drive the second normal mode, measure a motion of the second normal mode, and derive from the measured motion and the coarse measurement a measurement of the difference between the true acceleration or true external magnetic field and the coarse measurement.

公开(公告)号：US10545461B1

公开(公告)日：2020-01-28

申请号：US15639391

申请日：2017-06-30

Applicant: HRL Laboratories, LLC

Inventor： Christopher S. Roper ,  Adam F. Gross ,  Matthew T. Rakher ,  Logan D. Sorenson ,  John J. Vajo ,  Jason A. Graetz ,  Russell Mott ,  Danny Kim

IPC: G04F5/14 ,  C22B26/10 ,  H03L7/26 ,  H01P7/06

Abstract: Some variations provide an alkali metal or alkaline earth metal vapor cell with a solid ionic conductor and intercalable-compound electrodes. The intercalable-compound electrodes are used as efficient sources and/or as sinks for alkali metal or alkaline earth metal atoms, thus enabling electrical control over metal atom content in the vapor cell. Some variations provide a vapor-cell system comprising: a vapor-cell region configured to allow a vapor-cell optical path into a vapor-cell vapor phase; a first electrode containing an intercalable compound capable of being intercalated by at least one element selected from Rb, Cs, Na, K, or Sr; a second electrode electrically isolated from the first electrode; and an ion-conducting layer between the first electrode and the second electrode. The ion-conducting layer is ionically conductive for at least one ionic species selected from Rb+, Cs+, Na+, K+, or Sr2+. The first intercalable compound is preferably a carbonaceous material, such as graphite.

公开(公告)号：US20180149480A1

公开(公告)日：2018-05-31

申请号：US15825067

申请日：2017-11-28

Applicant: HRL Laboratories, LLC

Inventor： Shuoqin Wang ,  Logan D. Sorenson ,  Hung Nguyen ,  David Chang ,  Raviv Perahia

IPC: G01C21/18 ,  G01C21/16 ,  G01C21/20 ,  G01C21/08 ,  E21B44/00

CPC classification number: G01C21/18 ,  E21B7/04 ,  E21B44/005 ,  E21B47/09 ,  G01C21/08 ,  G01C21/165 ,  G01C21/20

Abstract: Described is a system for incremental trajectory estimation of an implement. During operation, the system determines a time span of each stationary period of the implement based on accelerometer and gyroscopic data. Gyroscopic bias is then estimated based on the time span and gyroscopic data. An attitude of the implement is then estimated at each time step based on the estimated gyroscopic bias and gyroscopic data. Further, a traveling distance of the implement is estimated. Finally, a trajectory of the implement is estimated based on the estimated attitude and traveling distance. Given the trajectory estimate, an implement (e.g., drilling platform, vehicle, etc.) can be caused to alter its direction based on the trajectory estimate.

公开(公告)号：US20180080310A1

公开(公告)日：2018-03-22

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 ,  E21B47/022 ,  E21B47/04

CPC classification number: E21B44/005 ,  E21B41/0092 ,  E21B47/022 ,  E21B47/04 ,  G01C21/16 ,  G01R33/0206

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：US20170292840A1

公开(公告)日：2017-10-12

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 ,  G01P15/18 ,  G01V7/06

CPC classification number: G01C21/08 ,  G01R33/0206 ,  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：US11506493B1

公开(公告)日：2022-11-22

申请号：US16745285

申请日：2020-01-16

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：US11469732B2

公开(公告)日：2022-10-11

申请号：US16368737

申请日：2019-03-28

Applicant: HRL Laboratories, LLC

Inventor： Raviv Perahia ,  Logan D. Sorenson ,  Lian X. Huang ,  David T. Chang ,  Makena S. White ,  Jeremy Bregman

IPC: H03H3/02 ,  H03H9/205 ,  H03H9/02 ,  H03H9/05 ,  H03H9/13 ,  H03H9/17 ,  H03H9/15

Abstract: A method of making a SiC resonator includes forming a layer of an oxide material on a relatively thick wafer of SiC; bonding the layer of oxide material on the relatively thick wafer of SiC to a handle wafer having at least an oxide exterior surface, the resulting bond being substantially free of voids; planarizing the relatively thick wafer of SiC to a desired thickness; forming top and bottom electrodes on the wafer of SiC wafer to define a SiC wafer resonator portion; and forming a trench around the top and bottom electrodes, the tench completely penetrating the planarized wafer of SiC around a majority of a distance surrounding said top and bottom electrodes, except for one or more tether regions of the planarized wafer of SiC which remain physically coupled a remaining portion the SiC wafer resonator portion which defines a frame formed of the planarized wafer of SiC surrounding the SiC wafer resonator portion.

公开(公告)号：US11275099B1

公开(公告)日：2022-03-15

申请号：US16512091

申请日：2019-07-15

Applicant: HRL Laboratories, LLC

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

IPC: G01P15/18 ,  G01P15/13 ,  G01P1/02

Abstract: A resonant accelerometer includes a proof mass, one or more springs connecting the proof mass to an anchor, and one or more capacitive transduction gaps providing a void or space between the movable proof mass and a corresponding fixed electrode, wherein the static displacement of the proof mass in response to acceleration applied to the anchor modifies the electrostatic stiffness imparted by one or more of the capacitive transduction gaps on the proof mass, resulting in a corresponding change in the resonance frequency of the resonant accelerometer.