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LiDAR device

A technology of laser radar and laser, which is applied in the direction of measuring device, electromagnetic wave re-radiation, and utilization of re-radiation, can solve the problems of reduced accuracy of wind speed measurement and reduced heterodyne efficiency

Active Publication Date: 2017-04-19
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then there is the following problem: if the coherent length is less than the width of the FFT gate pulse, the heterodyne efficiency will decrease, resulting in a decrease in the measurement accuracy of the wind speed

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0043] figure 1 It is a configuration diagram showing a laser radar device equipped with a coherent laser radar device according to Embodiment 1 of the present invention.

[0044] exist figure 1 Among them, the light source 1 is a device that excites continuous wave light (laser light) consisting of a single frequency called local light.

[0045] The optical splitter 2 is a device that divides the continuous wave light excited from the light source 1 into two continuous wave lights, outputs one part of the continuous wave light to the pulse modulator 3 , and outputs the other part of the continuous wave light to the optical coupler 6 .

[0046] The pulse modulator 3 is a device that imparts a predetermined frequency shift to the continuous wave light output from the optical splitter 2 , pulse-modulates the frequency-shifted continuous wave light, and outputs pulsed light to the optical circulator 4 .

[0047] The optical circulator 4 is a device that outputs the pulsed lig...

Embodiment approach 2

[0104] Figure 4 is a configuration diagram showing a laser radar device equipped with a coherent laser radar device according to Embodiment 2 of the present invention, and figure 1 The same reference numerals denote the same or corresponding parts, and therefore explanations are omitted.

[0105] The coherence length measurement device 21 is composed of, for example, a semiconductor integrated circuit or a single-chip microcomputer equipped with a CPU, and implements calculation of the coherence length L based on the frequency spectrum calculated by the FFT device 9. c processing.

[0106] The reception-to-SN ratio measuring device 22 is composed of, for example, a semiconductor integrated circuit or a single-chip microcomputer on which a CPU is mounted, and executes processing for calculating SNR from the frequency spectrum calculated by the FFT device 9 . Furthermore, the reception SN ratio measuring means 22 constitutes a signal-to-noise ratio calculation means.

[010...

Embodiment approach 3

[0151] Figure 5 It is a configuration diagram showing a laser radar device equipped with a coherent laser radar device according to Embodiment 3 of the present invention. In the picture with figure 1 The same reference numerals denote the same or corresponding parts, and therefore explanations are omitted.

[0152] The distance resolution calculation unit 31 is composed of, for example, a semiconductor integrated circuit or a single-chip microcomputer on which a CPU is mounted, and performs the following processing: based on the FFT gate pulse width G obtained after setting and changing by the coherence length measuring device 32 w (or pulse width P w ), calculate the distance resolution ΔR. Furthermore, the distance resolution calculation section 31 constitutes a distance resolution calculation unit.

[0153] The coherence length measurement device 32 is composed of, for example, a semiconductor integrated circuit or a single-chip microcomputer equipped with a CPU, and ...

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Abstract

Equipped with a coherence length measuring device (10), it calculates a coherence length (Lc) based on the frequency spectrum (v) calculated by the FFT device (9), and when the coherence length (Lc) is smaller than the FFT gate pulse width (Gw) Under the situation, carry out the setting change that is used to narrow this FFT strobe pulse width (Gw) and pulse width (Pw), FFT device (9) takes the FFT strobe pulse after setting change as unit, to slave A / D Frequency analysis is performed on the received signal output from the converter (8), and the frequency spectrum v of the received signal is calculated.

Description

technical field [0001] The present invention relates to a coherent lidar device and a laser radar device in which the width of a range gate is set to Appropriate value, thereby improving the heterodyne efficiency. Background technique [0002] In a general laser radar device as disclosed in Patent Document 1 below, laser light (scattered light) reflected by aerosol existing in the air is received after emitting laser light as pulsed light into the atmosphere. [0003] The laser radar device performs heterodyne detection of the scattered light and the transmitted pulse light, obtains the Doppler shift accompanying the movement of the aerosol, and measures the wind speed in the laser irradiation direction ( aerosol movement speed). [0004] Figure 9 It is a configuration diagram showing a general laser radar device, and the laser radar device is composed of the following elements. [0005] (1) A light source 101 that excites continuous wave light (laser light) consisting o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/95G01W1/00G01S17/18
CPCG01S7/483G01S17/58G01S17/95G01S17/18Y02A90/10G01P5/26G01S7/4813
Inventor 今城胜治小竹论季龟山俊平
Owner MITSUBISHI ELECTRIC CORP