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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10914821 B1

PDFFull Text
Date of Patent:
Feb. 09, 2021

Filed:

Jun. 25, 2018

Calibration and alignment of coherent lidar system

Applicant:

GM Global Technology Operations Llc, Detroit, MI (US);

Inventors:

Pamela R. Patterson, Los Angeles, CA (US);

Keyvan Sayyah, Santa Monica, CA (US);

Oleg Efimov, Thousand Oaks, CA (US);

Raymond Sarkissian, Studio City, CA (US);

James H. Schaffner, Chatsworth, CA (US);

Biqin Huang, Torrance, CA (US);

David Hammon, Simi Valley, CA (US);

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US);

Attorney:

Cantor Colburn LLP

Primary Examiner:

James R Hulka

Int. Cl.
CPC ...
G01S 7/00 (2006.01); G01S 7/481 (2006.01); G01S 7/4911 (2020.01); G01S 17/58 (2006.01); G01S 17/42 (2006.01); G01S 17/34 (2020.01); G01S 17/86 (2020.01); G01S 17/931 (2020.01); G01S 7/499 (2006.01); G01S 17/02 (2020.01); G02B 6/122 (2006.01); G02B 6/27 (2006.01); G02B 6/42 (2006.01); H01L 23/544 (2006.01); H01L 31/0232 (2014.01); H01L 31/16 (2006.01); G01S 17/00 (2020.01); G01S 17/32 (2020.01); G01S 7/4914 (2020.01); G01S 7/491 (2020.01); G01S 7/497 (2006.01); B81B 7/02 (2006.01); G02B 27/30 (2006.01); H01S 5/125 (2006.01); G01S 7/4913 (2020.01); G02B 6/00 (2006.01);
U.S. Cl.
CPC ...
G01S 7/4815 (2013.01); B81B 7/02 (2013.01); G01S 7/4816 (2013.01); G01S 7/4817 (2013.01); G01S 7/4818 (2013.01); G01S 7/491 (2013.01); G01S 7/499 (2013.01); G01S 7/4911 (2013.01); G01S 7/4913 (2013.01); G01S 7/4914 (2013.01); G01S 7/4972 (2013.01); G01S 17/003 (2013.01); G01S 17/02 (2013.01); G01S 17/32 (2013.01); G01S 17/34 (2020.01); G01S 17/42 (2013.01); G01S 17/58 (2013.01); G01S 17/86 (2020.01); G01S 17/931 (2020.01); G02B 6/122 (2013.01); G02B 6/2766 (2013.01); G02B 6/4209 (2013.01); G02B 27/30 (2013.01); H01L 23/544 (2013.01); H01L 31/02327 (2013.01); H01L 31/16 (2013.01); H01S 5/125 (2013.01); B81B 2207/03 (2013.01); G02B 2006/0098 (2013.01); H01L 2223/54426 (2013.01); H01L 2223/54486 (2013.01);
Abstract

A lidar system includes a light source to generate a frequency modulated continuous wave (FMCW) signal, and a waveguide splitter to split the FMCW signal into an output signal and a local oscillator (LO) signal. A transmit coupler provides the output signal for transmission. A receive lens obtains a received signal resulting from reflection of the output signal by a target. A waveguide coupler combines the received signal and the LO signal into a first combined signal and a second combined signal. A first phase modulator and second phase modulator respectively adjust a phase of the first combined signal and the second combined signal to provide a first phase modulated signal and a second phase modulated signal to a first photodetector and a second photodetector. A processor processes a first electrical signal and a second electrical signal from the first and second photodetectors to obtain information about the target.

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