Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Coherent laser radar adopting optical phase locking self-adaptive compensation Doppler frequency shift

A technology of Doppler frequency shift and adaptive compensation, which is applied in the field of coherent lidar, can solve the problems of increasing the difficulty of signal acquisition and processing, the beat frequency signal exceeding the detectable bandwidth range, and high Doppler frequency shift. Achieve the effect of increasing loop capture bandwidth, reducing Doppler frequency shift, and ensuring accuracy

Pending Publication Date: 2021-04-30
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the coherent lidar detects a high-speed moving target, the high-speed motion of the target will produce a high Doppler frequency shift, resulting in the beat frequency signal exceeding the detectable bandwidth range of the detector, and the higher beat frequency increases the The difficulty of signal acquisition and processing

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Coherent laser radar adopting optical phase locking self-adaptive compensation Doppler frequency shift

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] like figure 1 As shown, the coherent laser radar adopting optical phase-locked loop compensation Doppler frequency shift proposed by the present invention includes a 1064nm solid-state laser with a line width of the kHz order as the main laser 1 (space coupling); it has temperature tuning and PZT tuning functions The 1064nm solid-state laser used as a tunable local oscillator laser 2, its temperature tuning coefficient can reach GHz / ℃, and the PZT tuning coefficient is tens of MHz / V; the collimator is used as the receiving optical system 3, and the 3dB coupler of the polarization maintaining fiber 4 , a high-bandwidth balanced detector 5, a frequency and phase detection module 6 of ADI, a charge pump 7 and a loop filter 8, finally forming an optical phase-locked loop with a loop bandwidth of 50 kHz and a phase margin of 45°. The beat frequency electrical signal is obtained by using the interference of the echo signal emitted by the main laser to the reflected / scattered ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a coherent laser radar adopting optical phase locking self-adaptive compensation Doppler frequency shift. The coherent laser radar comprises a main laser (spatial coupling), a tunable local oscillator laser, a receiving optical system, a 3dB coupler, a balance detector, a phase frequency detection (PFD) module, a charge pump and a loop filter. Laser emitted by the main laser irradiates an echo signal reflected by a high-speed moving target to interfere with local oscillation light to obtain a beat frequency signal, the beat frequency signal and a set reference signal pass through the phase frequency detection module to obtain the phase difference of the two signals, corresponding control voltage is generated through the loop filter, and the frequency of the local oscillation laser is regulated and controlled. And the beat frequency signal is locked to a set reference signal phase. And at the moment, compared with echo and local oscillator laser direct beat frequency signals, the beat frequency signals during locking have the advantages that the signal frequency is obviously reduced, subsequent data processing is more facilitated, and the coherent laser radar is more suitable for detection of high-speed targets.

Description

technical field [0001] The invention belongs to the technical field of coherent laser radar, in particular to a coherent laser radar which adopts optical phase-locking and adaptively compensates Doppler frequency shift. Background technique [0002] Coherent laser radar has the advantages of high measurement accuracy, fast response speed, strong anti-interference ability, and strong resolution ability. However, when the coherent lidar detects a high-speed moving target, the high-speed motion of the target will produce a high Doppler frequency shift, resulting in the beat frequency signal exceeding the detectable bandwidth range of the detector, and the higher beat frequency increases the The difficulty of signal acquisition and processing. Therefore, compensating the Doppler frequency shift is the basis for coherent lidar to detect high-speed moving targets. Contents of the invention [0003] In order to overcome the shortcomings and deficiencies of the prior art, the pr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/02G01S7/48
CPCG01S17/02G01S7/4802
Inventor 任宁赵彬刘博
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com