US 11,899,111 B2
Techniques for identifying true signals in coherent LIDAR systems
Esha John, Sunnyvale, CA (US); Jose Krause Perin, Mountain View, CA (US); Kumar Bhargav Viswanatha, Santa Clara, CA (US); Rajendra Tushar Moorti, Mountain View, CA (US); and Mina Rezk, Haymarket, VA (US)
Assigned to Aeva, Inc., Mountain View, CA (US)
Filed by AEVA, INC., Mountain View, CA (US)
Filed on Jun. 2, 2022, as Appl. No. 17/831,169.
Application 17/831,169 is a continuation of application No. 17/495,692, filed on Oct. 6, 2021, granted, now 11,360,214.
Claims priority of provisional application 63/089,178, filed on Oct. 8, 2020.
Prior Publication US 2022/0299640 A1, Sep. 22, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G01C 3/08 (2006.01); G01S 17/10 (2020.01); G01S 7/493 (2006.01); G01S 7/487 (2006.01); G01S 7/4865 (2020.01)
CPC G01S 17/10 (2013.01) [G01S 7/4865 (2013.01); G01S 7/4873 (2013.01); G01S 7/493 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
transmitting, toward a target in a field of view of a light detection and ranging (LIDAR) system, a transmitted optical beam comprising at least one up-chirp frequency and at least one down-chirp frequency, wherein the transmitted optical beam is modulated to have phase non-linearities;
receiving, from the target, a returned optical beam corresponding with the transmitted optical beam;
generating a baseband signal based on the returned optical beam, wherein the baseband signal comprises a plurality of peaks corresponding with the up-chirp frequency and the down-chirp frequency;
identifying, among the plurality of peaks, a first true peak in the baseband signal;
identifying, among the plurality of peaks, a second true peak in the baseband signal based, at least in part, on a spectral shape of the second true peak caused by the phase non-linearities; and
determining a location of the target using the first true peak and the second true peak.