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Coding method for all-depth-of-field imaging of range-gating-based laser radar

A technology of laser radar and coding method, which is applied in the direction of electromagnetic wave re-radiation, instruments, measuring devices, etc., can solve unsolved problems such as coding method, achieve the effect of simple and effective coding method, fast integration, and improve detection efficiency

Active Publication Date: 2019-03-26
SHANDONG INST OF AEROSPACE ELECTRONICS TECH
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Problems solved by technology

Although this literature gives a qualitative idea, it does not solve the coding method of the specific assignment

Method used

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  • Coding method for all-depth-of-field imaging of range-gating-based laser radar
  • Coding method for all-depth-of-field imaging of range-gating-based laser radar
  • Coding method for all-depth-of-field imaging of range-gating-based laser radar

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Embodiment Construction

[0028] The encoding method of the range-gated lidar full-depth imaging of the present invention, the specific steps are as follows,

[0029] (1) According to the light attenuation coefficient in the laser radar working medium (air or water body), determine the total detection distance.

[0030] (2) Determine the single-slice depth of field according to the gated imaging parameters. Let the laser pulse width be t l , ICCD gate width is t g , then the single slice depth of field where c v is the light beam in the medium;

[0031] (3) Determine the number of slices required according to the total detection distance and single-slice depth of field, Among them, round() means rounding to the nearest integer;

[0032] (4) Determine the actual detection distance corresponding to each slice, set R m is the detection distance corresponding to the mth slice, then R m =md s ;

[0033] (5) Determine the actual ICCD opening time corresponding to each slice (initial time is 0), t...

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Abstract

The invention relates to a coding method for all-depth-of-field imaging of a range-gating-based laser radar. According to a light attenuation coefficient in a working medium of the laser radar, a total detection distance is determined; a single slice depth of field based on a gated imaging parameter; the needed slice number is determined based on the total detection distance and the single slice depth of field; actual detection distances corresponding to all slices and actually corresponding ICCD opening times of all slices are determined; on the basis of the principle of equal energy of light, a ratio of laser pulse numbers needing to be allocated to all slices is determined; a one-dimensional array is obtained and a sum of the one-dimensional array is calculated; the total laser pulse number of single-frame imaging is determined based on the gated imaging parameter and pulse numbers allocated to all slices actually are determined; and the pulse numbers allocated to all slices actually are determined. With the coding method, the all-depth-of-field imaging in the detection range is realized; and the detection efficiency is improved.

Description

technical field [0001] The invention relates to a coding method for realizing range-gated laser radar panoramic depth imaging, and belongs to the technical fields of laser technology, photoelectric detection, machine vision and the like. Background technique [0002] The lidar system based on range gating is widely used in various aspects such as underwater detection, night target imaging and military reconnaissance. Range gating adopts the idea of ​​slice imaging, and separates target reflection signals and environmental backscatter signals at different distances in space through time-division working mode. The principle is that when the laser emits pulsed laser light to illuminate the target, the detector shutter is closed; then when the laser pulse reflected by the target is about to reach the detector, the detector shutter is opened and closed immediately after receiving the reflected pulse. This working mode has a physical shielding effect on the reflected light other ...

Claims

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Application Information

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IPC IPC(8): G01S17/89
CPCG01S17/89
Inventor 金东东纪春恒张晓晖韩宏伟楚新波裴崇雷彭勃孙磊
Owner SHANDONG INST OF AEROSPACE ELECTRONICS TECH
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