High sensitivity polarization laser radar system based on Gm-APD

A technology of laser radar and polarization beam splitter, which is applied in the field of high-sensitivity weak signal detection, can solve the problems of inability to detect weak signals, inability to distinguish targets and occlusions, etc.

Active Publication Date: 2017-10-20
HARBIN INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the prior art cannot detect weak signals and canno...

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  • High sensitivity polarization laser radar system based on Gm-APD
  • High sensitivity polarization laser radar system based on Gm-APD
  • High sensitivity polarization laser radar system based on Gm-APD

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specific Embodiment approach 1

[0027] Specific implementation mode one: combine figure 1 This embodiment is specifically described. The Gm-APD-based high-sensitivity polarization laser radar system described in this embodiment includes a pulse code generator 1, a pulse laser 2, a polarizer 3, a first 1 / 4 wave plate 4, a scanning Device 5, narrow band filter 6, second 1 / 4 wave plate 7, polarization beam splitter 8, total mirror 9, Gm-APD1 single photon detector 10, Gm-APD2 single photon detector 11 and signal processing module 12 ;

[0028] The pulse code generator 1 generates a randomly coded pulse sequence electrical signal, and then the electrical signal is used as an external drive to modulate the pulse laser 2 to generate a laser signal pulse sequence. The laser signal pulse sequence passes through the polarizer 3 and the first 1 / 4 wave plate 4 , and any polarization state can be modulated and loaded by adjusting the optical axis angle of the polarizer 3 and the first 1 / 4 wave plate 4 . In this embodi...

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Abstract

The invention relates to a high sensitivity polarization laser radar system based on Gm-APD, relates to the laser radar technology field and solves problems of incapability of detecting weak signals and incapability of distinguishing a target from a shielding object in the prior art. A modulation pulse laser device is driven by a pulse code generator to generate a laser signal pulse sequence, the laser signal pulse sequence is modulated through a polarizer and a first one-quarter wave plate, and the target is irradiated through a scanner; a returned laser signal through the scanner sequentially realizes incidence to a narrowband optical filter, a second one-quarter wave plate and a polarization splitter, the incident laser signal is divided by the polarization splitter into two paths of laser signals, the two paths of laser signals are respectively received by two single-photon detectors, detection signals outputted by the two single-photon detectors are inputted to a signal processing module, and the signal processing module is used for carrying out correlation of a reference signal and the two paths of detection signals to acquire a distance, intensity and a polarization degree of corresponding pixel points on a detected object. The method is advantaged in that the method is suitable for detecting the weak signals.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a high-sensitivity weak signal detection technology based on a Gm-APD single-photon detector. Background technique [0002] In recent decades, lidar has been widely used in various fields of national defense and industry due to its good directionality, high precision, high resolution, and miniaturization. Nowadays, there are more and more requirements for the detection distance of lidar in many fields. In addition, there are applications in various special environments such as heavy fog and dust, etc., which lead to extremely weak echo signals. In addition, due to the consideration of human eye safety and anti-reconnaissance, the detection of weak signals has gradually become a research hotspot of lidar. Existing detectors such as CCD and PIN cannot meet the sensitivity requirements. [0003] However, considering the detection of occluded targets, the 3D range image cannot ...

Claims

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Application Information

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IPC IPC(8): G01S17/89
CPCG01S17/89
Inventor 张子静赵远宋杰孙怿飞
Owner HARBIN INST OF TECH
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