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A distance measuring device and distance measuring method

A technology of a distance measuring device and a receiving device, which is applied in the field of distance measurement, can solve problems such as inaccurate results, SPAD ranging environmental noise interference, etc., and achieve the effect of reducing the probability of positioning errors

Active Publication Date: 2022-06-28
HANGZHOU GUANGPO INTELLIGENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In view of this, the object of the present invention is to propose a new SPAD-based ranging device and ranging method, which can overcome the problem of inaccurate results caused by SPAD ranging easily being interfered by environmental noise in the prior art

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  • A distance measuring device and distance measuring method
  • A distance measuring device and distance measuring method
  • A distance measuring device and distance measuring method

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Embodiment Construction

[0042] The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings, but these embodiments do not limit the present invention, and those of ordinary skill in the art can make structural, method, or functional transformations according to these embodiments. All are included in the protection scope of the present invention.

[0043] As mentioned in the background art, for the existing SPAD ranging solution, when the signal is read out, the measurement signal is easily drowned in the background noise due to the interference of ambient light and the crosstalk signal between the devices, thus affecting the performance of the SPAD device. Measurement accuracy.

[0044] In order to solve this problem, the present invention proposes an active light source with an encoding scheme, so that the measuring light emits light pulses with a specific encoding in one cycle, and by controlling the time interval between thes...

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Abstract

The present invention relates to a distance measuring device and a distance measuring method. The distance measuring device includes an active light source for emitting periodically modulated measuring light to a target object; a receiving device for receiving the measuring light returned from the target object, and a signal processing means for processing the measurement signal of the receiving means having at least one SPAD to generate statistical results, the periodically modulated measuring light being configured as a pulse sequence having several periods, each period comprising a pulse Period and blank period, there are at least two light pulses in a pulse period, and the length of each period is greater than or equal to the single working time of the SPAD, and the SPAD only responds to a light pulse trigger event in a single pulse period . The invention can overcome the problem of inaccurate results in the prior art that SPAD ranging is easily interfered by environmental noise.

Description

technical field [0001] The invention relates to distance measurement technology, in particular to a distance measurement device and a distance measurement method based on a single photon avalanche diode. Background technique [0002] In recent years, the field of unmanned driving or assisted driving has been in a period of vigorous development, and in-vehicle lidar technology is an important part of tackling key problems. It is the huge demand that has promoted the great development of lidar, and domestic and foreign lidar technology and related companies have emerged in large numbers. [0003] In the existing laser ranging technology, the detectors mostly use ordinary avalanche photodiodes (Avalanche Photon Diode, APD), but after the APD detects the light signal, the output signal is an analog quantity that is positively correlated with the light intensity received by the photosensitive surface. , in order to ensure the consistency of the waveform under different light int...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/10G01S7/4863G01S7/487
CPCG01S17/10G01S7/4863G01S7/4876
Inventor 顾可可马宁陈晓刚张合勇白云峰
Owner HANGZHOU GUANGPO INTELLIGENT TECH CO LTD