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
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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

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

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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 ...

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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...

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Application Information

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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
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