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All-optical pulse compression lidar system and ranging method for target detection in continuous scattering media

A target detection and lidar technology, applied in radio wave measurement systems, using re-radiation, measuring devices, etc., can solve the problems of limited modulation time bandwidth product and limited range of radar systems, so as to improve the range and detection signal. Noise ratio, fast processing speed, and the effect of improving the time-bandwidth product

Inactive Publication Date: 2019-08-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problem that the radar system’s operating distance is limited due to the limited modulation time-bandwidth product of the current pulse compression laser radar system

Method used

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  • All-optical pulse compression lidar system and ranging method for target detection in continuous scattering media
  • All-optical pulse compression lidar system and ranging method for target detection in continuous scattering media
  • All-optical pulse compression lidar system and ranging method for target detection in continuous scattering media

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specific Embodiment approach 1

[0032] Specific implementation mode one: combine figure 1 To describe this embodiment,

[0033] An all-optical pulse compression lidar system for target detection in continuous scattering media, including a transmitting terminal system and a receiving terminal system;

[0034] The transmitting terminal system includes an optical transmitting device, a femtosecond laser 1, a cascaded linear chirped fiber Bragg grating 2, a first optical circulator 3, a single-mode optical fiber 4 and a flat gain filter 5;

[0035] The femtosecond laser 1 outputs pulsed laser light. In the transmission direction of the pulsed laser light, a femtosecond laser 1, a cascaded linear chirped fiber Bragg grating 2, a first optical circulator 3, a single-mode fiber 4 and a flat Gain filter 5; the femtosecond laser 1 is connected to the port 1 of the first optical circulator 3 through a single-mode fiber, and the port 2 of the first optical circulator 3 is connected to the cascaded linear chirped fiber...

specific Embodiment approach 2

[0042] In this embodiment, the port 3 of the first optical circulator 3 is connected to the single-mode optical fiber 4. The single-mode optical fiber 4 is a single-mode dispersion optical fiber.

[0043] Other structures and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0045] In this embodiment, the port 3 of the first optical circulator 3 is connected to the single-mode optical fiber 4. The length of the single-mode optical fiber 4 described in the section is 30 km to 40 km.

[0046] Other structures and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a full optical pulse compression laser radar system and a range finding method for object detection in a continuous scattering medium, relating to the pulse compression laser radar system and the range finding method. The full optical pulse compression laser radar system comprises femotsecond laser which outputs pulse laser; in a transmission direction of pulse laser, the femot second laser, a cascade linear chirp fiber Bragg raster, a first optical circulator, a single mode optical fiber and a flat gain filter are arranged in a front end of an optical emission device; pulse laser is marked as an object reflection light signal after reflection; the optical reception device receives the object reflection light signal; in the signal transmission direction, a second optical circulator and a negative dispersion optical fiber Bragg raster are arranged on the rear end of the optical reception device. The full optical pulse compression laser radar system and the range finding method for object detection in continuous scattering medium utilize a cascade chirp fiber Bragg raster to generate a large time bandwidth product modulation signal, and adopt a negative dispersion optical fiber Bragg raster to carry out pulse compression processing in order to make range finding precision reach a millimeter magnitude. The full pulse compression laser radar system and the range finding method are applicable to the design and set up of a radar system.

Description

technical field [0001] The invention relates to a pulse compression laser radar system and a distance measuring method. Background technique [0002] Lidar is the product of the combination of traditional radar technology and modern laser technology. Laser radar has the advantages of extremely high angular resolution, extremely high distance resolution, high speed resolution, wide range of speed measurement, multiple images of targets, strong anti-interference ability, and smaller volume and weight than microwave radar. . [0003] In the practical application of laser detection, since there is no high-frequency signal in the backscattering background signal of continuous scattering medium, high-frequency modulation signal can be used for detection, and the high-frequency echo signal can be distinguished from the low-frequency background by filtering. [0004] Since the pulse compression lidar can obtain a high detection signal-to-noise ratio by performing pulse compression...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/02G01S7/484G01S7/486G01S17/10
CPCG01S7/484G01S7/486G01S17/02G01S17/26
Inventor 张勇杨成华赵远徐璐刘越豪沈志强宁敏
Owner HARBIN INST OF TECH