Time-of-flight-based distance detection system and method

Abstract

The invention discloses a time-of-flight-based distance detection system comprising a laser transmitting module and a laser receiving module, wherein the laser receiving module comprises a detector and a control unit; the laser transmitting module transmits a laser pulse sequence to a target, and the detector receives the photons reflected by the target and outputs a response signal; the control unit comprises a time-to-digital converter and a controller; the controller is used to control the time-to-digital converter to measure a first TOF value and a second TOF value, wherein the first TOF value is used to match the pre-defined corresponding relationship to regulate the working state of SPAD in the selected area of the detector array, and the second TOF value is used to calculate the distance between the target and the system. The invention performs a two-step test on a target object to obtain an accurate TOF value of the target object, which can overcome inaccurate measurement caused by parallax, and avoid power consumption and noise caused by excessive SPAD work.

Description

technical field [0001] The invention relates to the technical field of laser radar distance detection, in particular to a time-of-flight based distance detection system and method. Background technique [0002] The lidar distance detection system mainly adopts time-of-flight (TOF) ranging technology, which can be divided into direct time-of-flight technology and indirect time-of-flight technology according to different detection principles. In the direct time-of-flight technology, such as a pulsed laser is used to emit laser pulses towards the target object, and the laser pulses emitted to the target object are scattered or reflected, and the detector receives a part of the echo signal and processes it. According to the emission time of the laser pulse and the The detector detects the time difference of the echo signal to calculate the flight time of the target, thereby obtaining the distance information of the target object. [0003] In the ranging system based on direct t...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, provide a kind of time-of-flight-based distance detection system and method, to overcome the measurement inaccuracy that exists because of the parallax problem, and solve the power consumption and power consumption caused when too many SPAD works noise problem

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