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.:
Date of Patent:
Apr. 30, 2019
Filed:
Jan. 19, 2018
Applicant:
Raytheon Bbn Technologies Corp., Cambridge, MA (US);
Inventors:
Boulat A. Bash, Winchester, MA (US);
Saikat Guha, Cambridge, MA (US);
Assignee:
RAYTHEON BBN TECHNOLOGIES CORP., Cambridge, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01S 7/48 (2006.01); G01S 7/481 (2006.01); G01S 17/36 (2006.01); G01S 7/486 (2006.01); G01S 7/491 (2006.01);
U.S. Cl.
CPC ...
G01S 7/4814 (2013.01); G01S 7/4868 (2013.01); G01S 7/4917 (2013.01); G01S 17/36 (2013.01);
Abstract
A system for covert sensing. A broadband light source is split into two portions, a first portion of which illuminates a target, and a second portion of which is frequency shifted, e.g., by an acousto-optic frequency shifter. Light reflected from the target is combined with the frequency shifted light, detected, and demodulated with an in-phase and quadrature demodulator. The outputs of the demodulator are filtered and the arc tangent of the ratio is calculated.