公开(公告)号：US20230184910A1

公开(公告)日：2023-06-15

申请号：US17644366

申请日：2021-12-15

Applicant: Waymo LLC

Inventor： Sabareeshkumar Ravikumar ,  Pieter Kapsenberg ,  Srikanth Muroor ,  David Sobel ,  Michael Dierickx

IPC: G01S7/497 ,  G01S17/931 ,  B60W60/00

CPC classification number: G01S7/497 ,  G01S17/931 ,  B60W60/001 ,  B60W2420/52

Abstract: Example embodiments relate to a lower power linearization of lidar signals. An example embodiment includes a method that includes receiving a sample value output by an analog-to-digital converter (ADC) in a processing unit of a lidar system. The ADC may be configured to digitize an optical signal that is compressed by a gain amplifier. The compression may be based on a transfer function comprising one or more linear portions. The method also includes comparing the sample value to one or more threshold values. The one or more threshold values may correspond respectively to the one or more linear portions. The method further includes selecting, for the sample value and based on the comparing, an inverse gain and an associated intercept. The method additionally includes linearizing the sample value based on the selected inverse gain and the associated intercept.

公开(公告)号：US11494317B1

公开(公告)日：2022-11-08

申请号：US17137264

申请日：2020-12-29

Applicant: Waymo, LLC

Inventor： Sabareeshkumar Ravikumar ,  Shishuang Sun ,  Feng Wang ,  Ji Zhang

IPC: G06F13/16 ,  G06F12/02 ,  G06F13/42

Abstract: One example method of testing an electrical device comprises transmitting a data pattern to a memory device of the electrical device by a controller of the electrical device to provide a written data pattern to the memory device, wherein the data pattern replicates a resonant frequency of at least a portion of the electrical device, reading the written data pattern from the memory device with the controller, and comparing the written data pattern to the data pattern.