Lidar Time-of-Flight and Intensity Detection Signal-Path Based on Phase-Coded Multi-Pulse Transmission and Single-Bit Oversampled Matched Filter Detection

摘要

A light detection and ranging (Lidar) system includes a light transmission component driven by a phase-keyed burst pattern generator operable to apply a phase-coded key for activating the light source in a series of on/off pulses for the transmitted TX light. The on/off sequence is chosen such that the pattern's auto-correlation function has a maximized peak to side lobe ratio. The on/off pulses of the received RX light reflected from the object or scene is converted to a bitstream that is cross-correlated with the phase-coded key. A peak detector finds the peak of the cross-correlation function and generate a time-of-flight signal indicative of the time between the transmission of the TX light and the peak of the cross-correlation function.