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Laser radar system, and obtaining method and device of laser radar echo signal curve of laser radar system

A laser radar and echo signal technology, applied in the direction of measuring devices, electromagnetic wave re-radiation, radio wave measurement systems, etc., can solve inaccurate data inversion, blinding and damage of detectors, restrictions on mass production and post-processing Maintenance and other issues

Active Publication Date: 2019-11-22
山东国耀量子雷达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. In some areas (especially in the near-field area), the echo signal is strong, which can easily cause the detector to be saturated or even cause the detector to be blinded and damaged;
[0006] 2. The saturated echo signal needs to be corrected by the count rate correction function of the corresponding single photon detector, and the correction process will introduce errors, resulting in inaccurate data inversion;
[0007] 3. In the industrialization process of the system, each single-photon detector has its own corresponding correction function, so each single-photon detector-based lidar system needs an independent correction function for correction, which severely limits its batch size production and post-maintenance

Method used

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  • Laser radar system, and obtaining method and device of laser radar echo signal curve of laser radar system
  • Laser radar system, and obtaining method and device of laser radar echo signal curve of laser radar system
  • Laser radar system, and obtaining method and device of laser radar echo signal curve of laser radar system

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Experimental program
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Effect test

Embodiment 1

[0064] see figure 1 , the lidar system of this embodiment includes a laser 1 , a circulator 2 , a telescope system 3 , a single photon detector 4 , a time-to-digital-to-analog converter 5 , a data processor 6 , and a synchronization source module 7 .

[0065] The laser 1 is used to output a pulsed laser beam according to the pulse signal V0 of the pulse sequence S1. In this embodiment, the laser 1 is a pulsed laser, such as a fiber laser, whose emission wavelength is 1.5 microns. The choice of laser 1 is not particularly limited as long as it can output pulsed laser beams. The pulse sequence S1 outputs a pulse signal V0 every once in a while T0, please combine figure 2 .

[0066] The telescope system 3 is used to launch the pulsed laser beam into the atmosphere, and receive the backscattered beam formed by the interaction between the pulsed laser beam and the particles in the air in the atmosphere. The telescope system can adopt a telescope with integrated transceiver, or...

Embodiment 2

[0085] This implementation provides a method for obtaining a laser radar echo signal curve, which is applied to the laser radar system in Embodiment 1.

[0086] see image 3 , the method for obtaining the lidar echo signal curve includes the following steps.

[0087] Using the laser 1 of the lidar system in Embodiment 1, a pulsed laser beam is output according to the pulse signal V0 of the pulse sequence S1, wherein the pulse sequence S1 outputs one pulse signal V0 at intervals T0.

[0088] Using the telescope system 3 of the lidar system in Embodiment 1, the pulsed laser beam is emitted into the atmosphere, and the backscattered beam formed by the interaction of the pulsed laser beam with particles in the air in the atmosphere is received.

[0089] Utilize the single photon detector 4 of the lidar system in embodiment 1, detect the backscattered photon in described backscattered light beam according to pulse sequence S2; Wherein, pulse sequence S2 delays a period of time T1 ...

Embodiment 3

[0095] see Figure 4 , this embodiment introduces a method for obtaining a laser radar echo signal curve, which includes the following steps.

[0096] Step 1: Outputting a pulsed laser beam according to the pulse signal V0 of the pulse sequence S1; wherein, the pulse sequence S1 outputs one pulse signal V0 at intervals T0.

[0097] This step can be performed by the laser 1 in Embodiment 1.

[0098] Step 2, sending the pulsed laser beam into the atmosphere, and receiving the backscattered beam formed by the interaction between the pulsed laser beam and the particles in the air in the atmosphere.

[0099] This step can be performed by the telescope system 3 in Embodiment 1.

[0100] Step 3, detecting backscattered photons in the backscattered light beam.

[0101] In step 3, the backscattered photons are detected according to the pulse timing S2; wherein, the pulse timing S2 is delayed for a period of time T1 relative to the pulse timing S1, and after the delay time T1, the pu...

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Abstract

The invention discloses a laser radar system, and an obtaining method and device of a laser radar echo signal curve of the laser radar system. The method is characterized in that a photon counting rate is designed as a periodic photon counting rate which is divided into a photon counting rate under the high-voltage bias signal V1 (T) and a photon counting rate under the low-voltage bias signal V2(T), after the photon counting rate obtained under the low-voltage bias signal V2 (T) is corrected, the actual intensity of a near-field signal is restored to obtain the laser radar echo signal curvein the entire atmospheric area, and inversion of the atmospheric parameter information is performed. The method is advantaged in that as the near-field backscattering signal is strong and differs froma far-field signal by several orders of magnitude, the dynamic range of conventional detectors is difficult to meet radar requirements, by adjusting a near-field low-voltage and a far-field high-voltage bias voltages of the detector, detection efficiency of the detector at different detection distances is changed, actual intensity of the near-field signal and the far-field signal is restored by correcting detection efficiency, and detection of the laser radar echo signal curve in the entire area is realized.

Description

technical field [0001] The present invention relates to the field of laser radar, especially a laser radar system and a method for obtaining a laser radar echo signal curve in the related field of laser radar based on a single photon detector, a method for obtaining a laser radar echo signal curve and Its obtaining device, a computer terminal and a computer-readable storage medium adopting the method for obtaining the laser radar echo signal curve. Background technique [0002] The laser radar system based on backscattering can accurately measure various parameter information of the atmosphere. It emits a pulsed laser beam of power into the atmosphere, and the emitted pulsed laser beam interacts with the particles in the air to produce back For scattered photons, the telescope is used to receive the backscattered photons generated by the signal beam in the air and detect them, so as to record the number of backscattered photons at different distances (corresponding to differ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/487G01S17/95G01N21/53
CPCG01N21/53G01N2021/4709G01S7/4873G01S17/95Y02A90/10
Inventor 申屠国樑尚祥王冲陶岚
Owner 山东国耀量子雷达科技有限公司