Yun Jiao Li

US Patent:

20220299543, Sep 22, 2022

Filed:

Jun 25, 2020

Appl. No.:

17/618997

Inventors:

- MOUNTAIN VIEW CA, US
Bryan A. COOK - Silver Spring MD, US
Zhanlue ZHAO - MOUNTAIN VIEW CA, US
Yun LI - MOUNTAIN VIEW CA, US

Assignee:

CEVA TECHNOLOGIES, INC. - MOUNTAIN VIEW CA

International Classification:

G01P 21/00
G01C 19/54
G01C 25/00
G01P 3/80
G01P 15/14

Abstract:

A method for calculating a scale factor for a gyroscope can include detecting, by a gyroscope, a physical motion of a robot, detecting, by an optical flow (OF) sensor (and/or camera), one or more image signals including information; and deriving estimates of sensor calibration parameters based on the detected physical motion and the information.

US Patent:

20210318142, Oct 14, 2021

Filed:

Jun 24, 2021

Appl. No.:

17/356613

Inventors:

- Wilmington DE, US
Yun Li - Clarksburg MD, US
Mark Turner - Ijamsville MD, US

International Classification:

G01C 25/00
G01C 21/16
G01P 15/14

Abstract:

Methods, apparatus, and systems for estimating and calibrating a gyroscope's scale using a magnetometer mounted on the same device by rotating the device about an axis multiple times; and, during the first rotation, storing the magnetometer magnetic field reading and a heading (from integration of the gyroscope readings) at each of a plurality of angular reference points; then, during each subsequent rotation, determining magnetometer/gyroscope-heading output pairs for which the magnetometer output matches the magnetometer reading corresponding to one of the reference points, thereby indicating that the device has reached the same heading as the matching reference point; then, for each matching output sample pair, using that magnetometer/gyroscope-heading output sample pair to update the gyroscope scale factor for the corresponding angular reference point; and averaging those scale estimates to generate a final gyroscope scale factor estimate.

US Patent:

20190368892, Dec 5, 2019

Filed:

Jan 5, 2018

Appl. No.:

16/473321

Inventors:

- Wilmington DE, US
Yun Li - Clarksburg MD, US
Mark Turner - Ijamsville MD, US

International Classification:

G01C 25/00
G01C 21/16
G01P 15/14

Abstract:

Methods, apparatus, and systems for estimating and calibrating a gyroscope's scale using a magnetometer mounted on the same device by rotating the device about an axis multiple times; and, during the first rotation, storing the magnetometer magnetic field reading and a heading (from integration of the gyroscope readings) at each of a plurality of angular reference points; then, during each subsequent rotation, determining magnetometer/gyroscope-heading output pairs for which the magnetometer output matches the magnetometer reading corresponding to one of the reference points, thereby indicating that the device has reached the same heading as the matching reference point; then, for each matching output sample pair, using that magnetometer/gyroscope-heading output sample pair to update the gyroscope scale factor for the corresponding angular reference point; and averaging those scale estimates to generate a final gyroscope scale factor estimate.

US Patent:

20190293451, Sep 26, 2019

Filed:

Dec 13, 2017

Appl. No.:

16/466727

Inventors:

- Wilmington DE, US
Yun Li - Clarksburg MD, US

International Classification:

G01C 25/00
G01C 19/00

Abstract:

Methods, apparatus, and systems for calibrating the Zero Rate Offset (ZRO) of a gyroscope are disclosed.

US Patent:

20190025941, Jan 24, 2019

Filed:

Sep 21, 2018

Appl. No.:

16/138393

Inventors:

- Wilmington DE, US
Yun LI - Clarksburg MD, US

International Classification:

G06F 3/0346
G06F 3/038

Abstract:

A variable mapped on an orientation of a device is smoothed to have a gradual evolution by adjusting the estimated orientation of the device obtained via sensor fusion or other sensor processing to take into consideration a current measured angular velocity.

US Patent:

20180179494, Jun 28, 2018

Filed:

Jun 24, 2016

Appl. No.:

15/738247

Inventors:

- Cambridge MA, US
Yun LI - Cambridge MA, US
Rudolf JAENISCH - Cambridge MA, US

International Classification:

C12N 5/079
G01N 33/50

Abstract:

Described herein are cell culture media useful for the differentiation of human pluripotent stem cells into microglia. The methods described herein relate to in vitro generation of expandable, bankable, microglial cells by directed differentiation from human pluripotent stem cells (induced or embryonic). Using only defined cell culture media, differentiation of pluripotent stem cells is directed down a mesodermal path, in a rapid and scalable fashion, to generate cells adopting signatures of their in vivo counterparts, including gene expression, protein marker expression and functionality.

US Patent:

20160349078, Dec 1, 2016

Filed:

Jun 17, 2016

Appl. No.:

15/185461

Inventors:

- Rockville MD, US
Yun LI - Clarksburg MD, US
Matthew G. LIBERTY - Olney MD, US

International Classification:

G01C 25/00
A63F 13/25
G01C 19/5776

Abstract:

A method, a filtering module, and a computer-readable medium are configured to filter measurements acquired in a sensor reference system. Filtered measurements of motion sensors and a magnetometer attached to the device may then be used to determine orientation of a device in a non-inertial reference system. The measurements are filtered in a reference system, whose position relative to the sensor system can be calculated, and in which gravity and Earth's magnetic field have substantially constant direction and magnitude during the filtering window.

US Patent:

20160077609, Mar 17, 2016

Filed:

Apr 30, 2014

Appl. No.:

14/888255

Inventors:

- Rockville MD, US
Yun LI - Clarksburg MD, US

International Classification:

G06F 3/0346
G06F 3/038

Abstract:

The present inventions generally relate to methods and dedicated apparatuses outputting a variable mapped on a device orientation in a non-inertial reference system, with the device orientation being estimated using measurements of motion sensors (such as 3D accelerometers and gyroscopes) and a magnetometer or other similar sensors including cameras. A variable mapped on an orientation of a device is smoothed to have a gradual evolution by adjusting the estimated orientation of the device obtained via sensor fusion or other sensor processing to take into consideration a current measured angular velocity.