Patent ID: 11747472

Abstract:
Embodiments of the disclosure provide an optical sensing system, a range estimation system for the optical sensing system, and a method for the optical sensing system. The exemplary optical sensing system includes a transmitter configured to emit a plurality of laser pulses towards an object. The optical sensing system further includes a range estimation system configured to estimate a range between the object and the optical sensing system. The range estimation system includes an analog to digital converter (ADC) configured to convert a plurality of laser pulses returned from an object to a digital signal. The ADC has a predetermined sampling period. The exemplary system further includes a processor. The processor is configured to calculate an intensity ratio between two data points selected from the digital signal. The processor is further configured to determine an arrival time of the first returned laser pulse based on the intensity ratio and a time difference between respective sample times of the two data points. The processor is also configured to estimate a range between the object and the optical sensing system based on the arrival time of the first returned laser pulse.