Techniques for improving SNR in a FMCW LiDAR system using a coherent receiver
US11662444B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 2022 |
| Grant date | May 30, 2023 |
| Priority date | — |
| Expiry date | Jul 27, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/58
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The LiDAR system includes a coherent receiver disposed in a reference path. The coherent receiver includes a 90° optical hybrid to receive a portion of an optical beam along the reference path and a local oscillator (LO) signal to generate multiple output signals. The coherent receiver includes a first photodetector to receive a first and a second output signal to generate a first mixed signal, and a second photodetector to receive a third and a fourth output signal to generate a second mixed signal. The LiDAR system further includes a processor to combine the first mixed signal and the second mixed signal to generate a combined reference signal to suppress a negative image of a reference beat frequency signal to estimate a phase noise of the optical source to determine range and velocity information of the target.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.