Laser radar interference immunity enhancing method and system

A laser radar, anti-interference technology, applied in radio wave measurement system, electromagnetic wave re-radiation, utilization of re-radiation and other directions, can solve the problems of multiple measurement interference, reduce the refresh rate of measurement results, etc., to improve the success rate and reliability. performance, facilitate anti-interference processing, and reduce the number of measurements

Active Publication Date: 2018-02-23
XI AN ZHISENSOR TECH CO LTD
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AI Technical Summary

Problems solved by technology

For the existing technology, interval multiple measurements of a single target generally reduce the refresh rate of measurement results, while continuous multiple measurements of a single target are prone to the problem of complete interference of multiple measurements

Method used

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  • Laser radar interference immunity enhancing method and system
  • Laser radar interference immunity enhancing method and system
  • Laser radar interference immunity enhancing method and system

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0044] Realize the rapid scanning lidar system of the inventive method to be made up of following 5 parts:

[0045] Laser emission module composed of pulsed laser diode, collimation system and driving circuit;

[0046] Laser fast scanning module composed of single-axis MEMS micro-scanning mirror and its drive and feedback circuit;

[0047] Laser echo signal receiving module;

[0048] Laser echo signal processing module;

[0049] Statistical analysis module for measurement results.

[0050] figure 1 A schematic diagram of a fast scanning module based on a single-axis MEMS micro-scanning mirror and its single-target non-continuous multiple measurements is given. The performance parameters of the single-axis MEMS micro-scanning mirror are: the operating frequency is 1KHz, and the optical scanning range is 80° . Every time the MEMS micro-sca...

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Abstract

The invention provides a laser radar interference immunity enhancing method comprising the following steps: carrying out non-continuous multiple scanning for a random single target point, and carryinglaser fast coding for each time scanned laser signal. The multiple measuring behaviors aiming at each target point are non-continuous under fast scanning conditions, thus ensuring the measuring result high refresh rate and reliability; the laser fast coding is to convert the pulse signals in a single pulse period of the existing pulse laser into continuous and / or discrete subpulses with at leasttwo different pulse intensities and / or pulse widths; a series of subpulses as a whole body in the single pulse period can form a detection signal unit of the single target point emitted by the laser radar. The fast coding method is applied to each measuring time of the single target multiple measures, thus further enhancing the laser radar measuring reliability in each time, reducing the single target measuring frequency on said basis, and further improving the measuring result refresh rate.

Description

technical field [0001] The invention belongs to the field of laser radar, and relates to a method and system for enhancing the anti-interference performance of laser radar. Background technique [0002] In the process of lidar design, infrared lasers with specific wavelengths and narrow-band filters matching the wavelength of the light source are usually used to avoid the impact of ambient light on detection, thereby improving the signal-to-noise ratio and anti-interference of the laser receiving system. However, when lidar is widely used in the fields of automobile assisted driving or automatic driving, service robots, and industrial automation, laser light sources of various infrared wavelengths themselves become part of the ambient light, and these mixed environmental noises that are equivalent to the energy of laser signals are It may be received, processed and calculated by other lidar systems directly or after reflection, so as to obtain wrong relative position informa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/02G01S7/48
CPCG01S7/48G01S17/02
Inventor 游桥明夏长锋张雅男刘义松乔大勇
Owner XI AN ZHISENSOR TECH CO LTD
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