Distance measurement method and device based on SiPM signal time sequence points

Abstract

The invention discloses a distance measurement method and device based on SiPM signal time sequence points, wherein the method comprises the steps: controlling a signal transmitting end to transmit asignal to a target object, obtaining a signal reflected by the target object and received by a SiPM signal receiving end, and obtaining the time sequence point of the signal, wherein the step of obtaining the time sequence point of the signal comprises the following sub-steps: filtering an original signal through a filter to generate a filtered signal; and transmitting the original signal and thefiltered signal to a comparator, and obtaining an intersection point of a signal curve of the original signal and a signal curve of the filtered signal output by the comparator, wherein the intersection point is a time sequence point of the signal; querying a pre-generated corresponding table of the time sequence point and the error distance according to the time sequence point, and obtaining a corresponding target error distance; and calculating the measurement distance of the target object according to the time sequence point, and generating the actual distance of the target object accordingto the measurement distance and the target error distance. According to the invention, the actual distance of the object can be obtained according to the time sequence point, the measurement error isreduced, and the distance measurement precision is improved.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to a ranging method and device based on SiPM signal timing points. Background technique [0002] Traditional laser radars use linear mode detectors, such as PD (Photo-Diode, photodiode), APD (Avalanche Photo Diode, avalanche diode) and other detectors. With the development of technology, the new type of lidar adopts Geiger-mode single-photon detectors, such as SiPM (Silicon photomultiplier, silicon photomultiplier tube); SiPM is a single-photon avalanche diode composed of multiple SPADs All SPADs in the array are electrically connected in parallel, and all SPADs share one port for signal output. The structure diagram of SiPM is as follows: figure 1 shown. [0003] Time-of-Flight (ToF) is one of the mainstream methods for laser radar to achieve accurate ranging. The principle of ranging is as follows: figure 2 shown. The optical signal emitted by the signal trans...

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Problems solved by technology

[0008] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a ranging method and device based on SiPM signal timing points, aiming at solving the problem of drift error in the prior art when the SiPM-type laser radar measures the target object. The problem of low precision

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