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A dual-frequency LFM coherent wind lidar

A technology of linear frequency modulation and laser radar, which is applied in the field of radar, can solve the problems that dual-frequency coherent laser radar is difficult to achieve simultaneous ranging and speed measurement, and affects the resolution of ranging and speed measurement, so as to solve the problem of frequency sweep nonlinearity, distance High resolution and reduced speckle noise

Active Publication Date: 2020-01-03
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, it is difficult for dual-frequency coherent lidar to achieve simultaneous ranging and speed measurement
On the other hand, traditional laser radar has extremely high range resolution after applying linear frequency modulation technology, which has important applications in close-range precision detection, three-dimensional range imaging and autonomous safe soft landing of space capsules, but nonlinear frequency modulation and atmospheric turbulence effects seriously affect the The actual ranging resolution and speed resolution of the system

Method used

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  • A dual-frequency LFM coherent wind lidar
  • A dual-frequency LFM coherent wind lidar
  • A dual-frequency LFM coherent wind lidar

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Embodiment Construction

[0038] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0039] The terms "first", "second", "third" and "fourth" in the specification and claims of this application and the above drawings are used to distinguish different objects, rather than to describe a specific order . Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device compris...

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Abstract

The embodiment of the invention discloses a laser radar system. The laser radar system comprises a light source module, a modulation light module, a transmitting-receiving module, a detection module and a signal processing module, wherein double-wavelength laser beams are subjected to linear modulation through a modulation light module and are converted into double-frequency linear frequency modulation continuous wave laser beams; one laser beam is used as a local oscillation light beam and the other laser beam is used as signal light which has mutual effect with a detection target; the signal light scatters an echo signal through the detection target; the local oscillation light beam and the echo signal are subjected to coherent beat frequency, so as to obtain double-wavelength Doppler frequency shift difference value information. The laser radar system disclosed by the invention adopts double-wavelength linear frequency modulation laser so that influences, caused by non-linear linear frequency modulation and an atmospheric turbulence effect, on a speed measuring resolution ratio are extremely reduced; distance measurement and speed measurement are carried out on the detection target at the same time; the laser radar system has the advantages of high detection precision, electromagnetic interference resistance, no distance dead zones and the like.

Description

technical field [0001] The invention relates to the field of radar, in particular to a dual-frequency linear frequency modulation coherent wind-measuring laser radar. Background technique [0002] With the development of optical technology, lidar has developed rapidly in the fields of navigation, aerospace, meteorological element measurement, and atmospheric environment monitoring due to its advantages such as good directionality, high temporal and spatial resolution, high precision, and non-contact measurement. Wide range of applications. [0003] Lidar is a radar system that emits laser beams to detect characteristic quantities such as the position and speed of targets, and is mainly composed of laser transmitters, optical receivers, and information processing systems. By transmitting a detection signal (laser beam) to the target, and then processing the received signal reflected from the target (target echo) and the transmitted signal, the relevant information of the tar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/58G01S17/32
CPCG01S17/34G01S17/58
Inventor 夏海云王璐王冲上官明佳窦贤康
Owner UNIV OF SCI & TECH OF CHINA
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