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False color laser radar system

A laser radar and false color technology, applied in the field of false color laser radar system, can solve problems such as complex calculation methods, low energy, and low spectral channel energy, and achieve the effect of rich information, simple structure, and simple and flexible calculation methods

Pending Publication Date: 2021-11-19
NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent with the application number CN201810034753.2 discloses a hyperspectral laser radar system with hyperspectral resolution and distance resolution. Fiber dispersion is used to separate the spectral frequency of supercontinuum laser pulses in time, and the spectral measurement unit is used to obtain target visible light respectively. and near-infrared band spectral feature data, but its continuous spectroscopic process will lead to low energy in a single spectral channel, which cannot guarantee the working distance of radar spectral detection
The patent with the application number CN201811598297.0 discloses a hyperspectral three-dimensional structure radar system based on near-infrared light full-waveform ranging. There is also the problem of low energy in a single spectral channel
The patent with the application number CN202010570326.3 discloses an airborne supercontinuum laser hyperspectral lidar system. The width of a single spectral channel is only 10nm, which has the problem of low energy in a single spectral channel and limits the working distance of radar spectral detection. At the same time It also has the problem of strong interference from solar radiation in the visible light band
The patent with application number CN 201811598297.0 discloses a hyperspectral three-dimensional laser radar system based on near-infrared light full waveform ranging. Complicated, poor recognition effect
[0004] It can be seen that because the working distance of lidar is closely related to the energy of supercontinuum laser pulses, the existing inventions that combine spectral detection technology with range-finding lidar technology still have obvious technical defects, and the high resolution of the spectral channel (spectral bandwidth ~ 10nm) can provide a fine spectrum, but the energy of the light pulse in a single channel is too low, so that the working distance of the radar is greatly reduced, and it is difficult to have practical application

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Embodiment 1

[0060] The object of the present invention is to provide a false-color laser radar system, which uses a high-energy supercontinuum laser whose spectral energy is in the near-infrared band as an illumination source, and performs four ultra-wideband (channel width 100 mm) on echo light signals through a combination of dichroic prisms. -200nm) optical channel division, the purpose is to realize the target four-channel false color image information in the non-visible light band, with the characteristics of false color synthesis, long-distance, all-time, active work, etc. The information can support high-precision resolution and identification of target categories, and it is easy to be widely used in many fields such as terrain surveying and mapping, agriculture, forestry, 3D modeling, and unmanned driving.

[0061] The technical scheme adopted in the present invention is as figure 1 shown. Specifically, it is composed of a control system, a wide-spectrum optical transceiver devic...

Embodiment 2

[0081] Such as figure 2 Shown, the false color lidar system of the present invention, the control computer that is formed by programmable logic gate array produces clock signal, controls the high-energy supercontinuum laser that is formed by ytterbium-doped fiber amplifier, transmits repetition frequency 100kHz, pulse width 10ns, Fundamental mode supercontinuum laser pulse with pulse energy of 200μJ, spectral range of 1000-2000nm, and beam waist radius of 5μm. The emitted laser pulse passes through a beam collimator composed of a parabolic mirror with a focal length of 25mm, and then becomes parallel light, and injects it into the emitting mirror of the wide-spectrum light emitting and receiving system to achieve effective illumination of the target object within a distance of 200m. The back echo signal after loading the target spectrum is collected by the telescope receiving system of the wide-spectrum light emitting and receiving system, and then injected into a combination...

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Abstract

The invention provides a false color laser radar system. The false color laser radar system comprises a wide-spectrum light receiving and transmitting device, a color separation prism combination, a data acquisition system and a control system which are connected in sequence, wherein a control unit is used for controlling the wide-spectrum light receiving and transmitting device to emit radar beams to a target object for illumination; the wide-spectrum light receiving and transmitting device transmits an echo light signal reflected by the target object to the color separation prism combination; the color separation prism combination divides the echo light signal into a plurality of spectrum channels according to wavelengths; and the control unit further processes and synthesizes the light beams of the plurality of spectrum channels acquired by the data acquisition unit to obtain false color point cloud data. According to the false color laser radar system, the echo light signal is divided into the plurality of spectrum channels according to the wavelength by using the color separation prism combination, the structure is simple, and compared with a hyperspectral light splitting mode with the channel width of 10 nm, the selection channel width of the color separation optical filter is not less than 100 nm, higher light pulse energy in the channel can be received, and the technical advantage of long-distance detection is achieved.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a false-color laser radar system. Background technique [0002] As an active optoelectronic device for obtaining spatial orientation information of targets and observers, lidar has the advantages of narrow beam, good directivity, high spatial resolution, anti-interference, and all-day work. It is currently widely used in terrain surveying, agricultural , forestry, 3D modeling, unmanned driving and other fields. Among them, the range-finding laser radar emits a single-wavelength laser pulse to the target, measures the flight time information of the pulse to and from the radar and the target to obtain the target distance, and provides scanning angle information according to the field of view of the radar light emitting and receiving system, and calculates the The three-dimensional space point cloud data distribution of the target in the coordinate system, combined with the gra...

Claims

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Application Information

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IPC IPC(8): G01S17/48G01S7/484G01S7/4865
Inventor 殷科张江华郑鑫杨杰张卓航沈梅力
Owner NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI