Ranging method and device based on SiPM signal swing
A ranging method and signal swing technology, applied in the field of photoelectric detection, can solve problems such as drift error and low ranging accuracy, and achieve the effect of reducing measurement error and improving ranging accuracy
Active Publication Date: 2020-08-25
SHENZHEN ADAPS PHOTONICS TECH CO LTD
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[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 the SiPM signal swing, aiming to solve the drift error and low ranging accuracy of the SiPM laser radar in the prior art. The problem
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[0049] In order to make the object, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. Embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0050]Compared with traditional LiDAR, SiPM-type LiDAR has a saturation (Pile up) effect on the one hand, that is, the SPAD unit in SiPM is triggered by ambient light and saturated, resulting in waveform distortion and unable to detect signal light correctly; on the other hand, SiPM The signal will be different due to the strength of the signal. When the signal is relatively strong, the formed signal map is not a Gaussian spot; when the signal is weak, it will be closer to a Gaussian spot. Therefore, the ranging method of traditional lidar ...
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The invention discloses a ranging method and device based on SiPM signal swing, and the method comprises the steps: controlling a signal transmitting end to transmit a signal to a target object, obtaining a signal reflected by the target object and received by a SiPM signal receiving end, and respectively detecting a wide pulse signal voltage and a narrow pulse signal voltage of the target objectin real time; recording a first time when the wide pulse signal voltage of the target object reaches a maximum value and a second time when the narrow pulse signal voltage reaches a first voltage threshold value; obtaining a target time difference between the first time and the second time, querying a pre-generated time difference and error distance corresponding table according to the target timedifference, and obtaining a corresponding target error distance; calculating the measurement distance of the target object according to the second time, and obtaining the actual distance of the target object according to the measurement distance and the target error distance. According to the invention, the wide pulse signal and the narrow pulse signal of the SiPM laser radar are combined to measure the distance of the object, the distance measurement error is reduced, and the distance measurement precision is improved.
Description
technical field [0001] The invention relates to the field of photoelectric detection technology, in particular to a ranging method and device based on SiPM signal swing. 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); 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 transmitting end is reflected by the target object to the signal receiving end,...
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IPC IPC(8): G01S17/10G01S7/4865
CPCG01S7/4866G01S17/10
Inventor 臧凯张超马志洁
Owner SHENZHEN ADAPS PHOTONICS TECH CO LTD