Polarization diversity double-channel speed and distance measuring coherent laser radar measurement method and device

A polarization diversity, lidar technology, applied in measurement devices, radio wave measurement systems, instruments, etc., can solve problems such as low distance resolution, difficult operation, and limited speed measurement accuracy.

Active Publication Date: 2020-02-11
孙建锋
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Problems solved by technology

[0003] The current commercial LiDAR usually uses single-pulse laser time-of-flight method (Time of Flight) for distance measurement. The advantage is that the structure is simple and the technology is mature. The disadvantage is that it can only provide the distance information of the target, and the speed is based on the change of the distance measurement data. Obtained by differential calculation
However, this algorithm requires a high signal-to-nois

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  • Polarization diversity double-channel speed and distance measuring coherent laser radar measurement method and device
  • Polarization diversity double-channel speed and distance measuring coherent laser radar measurement method and device
  • Polarization diversity double-channel speed and distance measuring coherent laser radar measurement method and device

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Embodiment Construction

[0097] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present invention.

[0098] Embodiment: Polarization diversity dual-channel speed measurement and ranging coherent laser radar measurement device, such as figure 1 As shown, including the laser light source 1, the eye-safe 1550nm single-mode narrow-linewidth continuous fiber laser is used, the laser linewidth is 10kHz, the output power is 20mW, and the optical fiber output has isolation protection. The laser light source 1 passes through the polarizer 2 Polarization, to ensure that the polarization extinction ratio is greater than 25dB, and the polarization direction can be controlled to rotate; after polarization, the output beam of the laser light source 1 is divided into a vertically polarized beam and a horizontally polarized beam by the first polarization beam splitter 3; the vertically polarized beam and the The l...

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Abstract

The invention discloses a polarization diversity double-channel speed and distance measuring coherent laser radar measurement method and device. A laser beam output by a laser source is divided by a first polarization beam splitter into a speed measurement light beam and a distance measurement light beam which are orthogonally polarized; the speed measurement light beam adopts quadrature demodulation coherent homodyne Doppler for laser speed measurement; and the distance measurement light beam uses pseudo-random code high-speed phase modulation for laser distance measurement. The speed and distance of a long-distance target are measured precisely and synchronously by means of polarization diversity, the whole system is small, operation is easy, and the development prospects are good.

Description

technical field [0001] The invention relates to the technical field of laser ranging and speed measurement, in particular to a polarization diversity dual-channel speed measurement and ranging coherent laser radar measurement method and device 。 Background technique [0002] Environmental perception technology is an important part of the autonomous driving platform. It uses sensors such as lidar and millimeter-wave radar to perceive the surrounding environment and provide decision-making basis for the autonomous driving platform. As one of the key core technologies, lidar technology can effectively provide the information required by the autonomous driving platform decision-making and control system, and has become an indispensable sensor for autonomous driving environment perception. The distance and speed of the target are important information for the autonomous driving platform to judge the external environment, and it is an indispensable part to realize intelligent dri...

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Application Information

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IPC IPC(8): G01S17/32G01S17/58
CPCG01S17/32G01S17/58
Inventor 职亚楠孙建锋潘卫清田克汉戴恩文
Owner 孙建锋
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