Method and device for measuring a distance to a target in a multi-user environment using at least two wavelengths

US11493614B2 · kind B2 · utility

Assignee

• FASTREE3D SA · CH

Inventors

• Ting Gong · Beijing, CN
• Stefan Keller · Mainaschaff, DE
• Lucio Carrara · Lausanne, CH

Key dates

• Filing date: Nov 1, 2016
• Grant date: Nov 8, 2022
• Expiry date: Jan 13, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S17/10
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for measuring a distance to a target in a multi-user environment, comprising: irradiating the environment by a series of light pulses, wherein this series of light pulses is emitted by a battery of at least two or a single light source device emitting on at least two different wavelengths, the light pulses being emitted at a determined repetition rate and with a determined randomly selected wavelength; collecting pulses reflected or scattered from the environment to at least one detector equipped with a wavelength filter whose pass band corresponds to the selected emitted wavelength; assigning a timestamp at the detection of a pulse by at least one chronometer connected to the detector, said timestamps corresponding to the time of arrival (TOA); determining the statistical distribution of said time of arrivals; determining the distance to the target from said statistical distribution.