Title:
LASER RADAR AND TIME MEASUREMENT METHOD BASED ON LASER RADAR
Document Type and Number:
WIPO Patent Application WO/2018/176288
Kind Code:
A1
Abstract:
Provided is a laser radar. The laser radar comprises a photosensor (110), an amplification circuit (120), a comparison circuit (130), and a controller (140). The photosensor is used for receiving an optical pulse signal, converting the optical pulse signal into an electrical signal and outputting the electrical signal to the amplification circuit. The amplification circuit is used for performing amplification operation on the electrical signal inputted from the photosensor and outputting the electric signal on which the amplification operation has been performed to the comparison circuit. The comparison circuit is used for performing comparison operation on the electrical signal inputted from the amplification circuit with a preset threshold, and extracting time information corresponding to the electrical signal. The controller is used for adjusting the gain of the photosensor or adjusting a preset threshold of the comparison circuit, so that a noise signal is lower than the preset threshold. Also provided is a time measurement method based on the laser radar. The distortion of measured time information caused by triggering of the comparison circuit by a noise signal when the strength of the noise signal is greater than a preset threshold can be avoided, thereby improving the accuracy of time measurement.
Inventors:
LIU XIANG (CN)
ZHAN ZHIPENG (CN)
PU WENJIN (CN)
HONG XIAOPING (CN)
ZHAN ZHIPENG (CN)
PU WENJIN (CN)
HONG XIAOPING (CN)
Application Number:
PCT/CN2017/078661
Publication Date:
October 04, 2018
Filing Date:
March 29, 2017
Export Citation:
Assignee:
SZ DJI TECHNOLOGY CO LTD (CN)
International Classes:
G01S7/486; G01S17/00; G01S17/10
Foreign References:
| CN202443121U | 2012-09-19 | |||
| CN101216562A | 2008-07-09 | |||
| CN102621555A | 2012-08-01 | |||
| CN101029934A | 2007-09-05 | |||
| CN203688801U | 2014-07-02 | |||
| CN104142504A | 2014-11-12 | |||
| US20020136251A1 | 2002-09-26 |
Other References:
OUYANG, JUNHUA ET AL.: "Study of Constant False Alarm Rate Controlling Technique Based on FPGA in Lidar", JOURNAL OF INFRARED AND MILLIMETER WAVES, vol. 28, no. 1, 28 February 2009 (2009-02-28), pages 50 - 53, XP055539782, ISSN: 1001-9014
Attorney, Agent or Firm:
SCIHEAD IP LAW FIRM (CN)
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