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Photon-counting imaging laser radar for filtering noise in real time by adopting adjacent pixel element threshold value method

An adjacent pixel and photon counting technology, which is applied in photometry using electric radiation detectors, using re-radiation, re-radiation of electromagnetic waves, etc., can solve the problem that noise filtering technology cannot meet the requirements of real-time applications, and achieve The effect of light weight, low power consumption and small size

Inactive Publication Date: 2016-05-25
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing photon technology imaging laser radar noise filtering technology cannot meet the requirements of real-time application, and proposes a photon counting imaging laser radar that adopts the adjacent pixel threshold method to filter noise in real time

Method used

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  • Photon-counting imaging laser radar for filtering noise in real time by adopting adjacent pixel element threshold value method
  • Photon-counting imaging laser radar for filtering noise in real time by adopting adjacent pixel element threshold value method
  • Photon-counting imaging laser radar for filtering noise in real time by adopting adjacent pixel element threshold value method

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specific Embodiment approach 1

[0023] Specific implementation mode 1, refer to figure 1 This embodiment is described in detail. A photon counting imaging laser radar that adopts the adjacent pixel threshold method to filter noise in real time described in this embodiment includes a laser 1, a beam splitter 2, an emission optical system 3, and a PIN detector 4 , receiving optical system 5, Gm-APD single photon detector array 6 and adjacent pixel threshold processing module 7;

[0024] Laser 1 is used to generate pulsed laser signals, the pulsed laser signals are incident to beam splitter 2, and two paths of pulsed laser signals are formed through beam splitter 2, one path is the reflected pulsed laser signal reflected by beam splitter 2, and the other path is the transmitted pulsed laser signal transmitted by the beam splitter 2;

[0025] The reflected pulsed laser signal is incident to the PIN detector 4, and the initial signal is output after being processed by the PIN detector 4, and the initial signal i...

specific Embodiment approach 2

[0029] Specific Embodiment 2. This embodiment is a further description of the photon counting imaging laser radar that uses the adjacent pixel threshold method to filter noise in real time as described in Embodiment 1. In this embodiment, it also includes image display and storage. Module 8, Image Display and Storage Module 8 is used to display and store the target three-dimensional distance image processed and output by the adjacent pixel threshold processing module 7 .

specific Embodiment approach 3

[0030] Specific Embodiment 3. This embodiment is a further description of the photon-counting imaging lidar described in Embodiment 1 that adopts the adjacent pixel threshold method to filter noise in real time. In this embodiment, the laser 1 is a narrow pulse laser.

[0031] In this embodiment, the laser is a narrow pulse laser, and the pulse can improve the time correlation of the signal pulse, and the use of the narrow pulse can also help to improve the imaging precision.

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Abstract

The invention relates to a photon-counting imaging laser radar for filtering noise in real time by adopting an adjacent pixel element threshold value method, and the radar relates to the technical field of laser radar. The problem that the photon-counting imaging laser radar noise filtering technology can not meet the real-time application requirement is solved. A pulse laser signal enters a beam splitter to form two signals; one signal is processed through a PIN detector and is outputted to an adjacent pixel element threshold value processing module; the other signal is collimated through a optical transmitting system to radiate a target; the other signal is spread by the target and outputted an echo signal, the echo signal passes through a receiving optical system and a Gm-APD single-photon detector array, the adjacent pixel element threshold value processing module records the echo signal comprising time correlation and compares the signal with an initial signal, so as to obtain the round-trip time difference of the pixel corresponding to the Gm-APD single-photon detector array, the round-trip time difference is calculated to obtain a distance value of the corresponding pixel target, and a target 3D distance image is obtained finally. The radar is suitable for filtering the noise in laser imaging.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a noise filtering technology of photon counting imaging laser radar that can be performed in real time. Background technique [0002] Photon counting imaging lidar can detect targets in the absence of photons (less than one photon per echo pulse per pixel), so it has become a research hotspot in the field of lidar. However, due to the extremely high response sensitivity of the photon counting imaging lidar, the photon counting imaging lidar is also easily triggered by noise, resulting in a large number of false alarms and seriously affecting the imaging quality. [0003] The current photon counting imaging lidar noise filtering technology is mainly multi-pulse accumulation and image post-processing technology. These traditional technologies need to accumulate detection time or post-processing time, which cannot meet the requirements of real-time applications. Contents of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/89G01J1/42
CPCG01S17/89G01J1/42
Inventor 张子静赵远靳辰飞张勇
Owner HARBIN INST OF TECH
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