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Signal processing method and laser radar system

A laser radar and signal processing technology, applied in the radio wave measurement system, electromagnetic wave re-radiation, utilization of re-radiation, etc., can solve problems such as reducing the maximum power of detectable echo signals, limiting the detection dynamic range of the laser radar system, etc., to achieve Improve the detection dynamic range, reduce the impact, and reduce the effect of blind spots

Pending Publication Date: 2022-04-15
洛伦兹(宁波)科技有限公司
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Problems solved by technology

Mixing with the echo signal light and returning to the photoelectric detection system will saturate the photodetector, increase the pulse width of the noise signal, and cover the short-distance echo signal, thus causing a detection blind spot at a certain distance, and a short-distance blind spot appears , which reduces the maximum power of the detectable echo signal and limits the detection dynamic range of the lidar system

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  • Signal processing method and laser radar system
  • Signal processing method and laser radar system
  • Signal processing method and laser radar system

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[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them.

[0026] This embodiment provides a laser radar system, see for example figure 1 The structure diagram of the lidar system is shown, the lidar system includes: a laser 11, a coaxial transceiver 12, an optical lens 13, a signal processor (not shown in the figure) and at least two photodetectors 141-14N.

[0027] The above-mentioned laser 11 may be a fiber pulse laser, which is used for controlling and emitting pulsed laser light.

[0028] The above-mentioned coaxial transceiver device 12 may be an all-fiber coaxial transceiver device, and the coaxial transceiver device 12 is used to emit pulsed laser light and receive echo sig...

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Abstract

The invention provides a signal processing method and a laser radar system, which are applied to the laser radar system, a coaxial transceiver of the laser radar system is connected with at least two photoelectric detectors, the detection ranges of the photoelectric detectors are different, and the signal processing method comprises the following steps: in a pulse period of an outgoing beam emitted by a laser, receiving a signal from the coaxial transceiver; setting the detection sequence of the photoelectric detectors; based on the detection sequence, the photoelectric detectors are controlled to sequentially detect echo signals in different time periods, at least one photoelectric detector detects the echo signals in each time period, and the detection sequence of the photoelectric detectors is ranked from large to small according to the saturated optical power. According to the invention, the influence of optical fiber end face reflection noise on short-distance target echo detection can be reduced, so that a short-distance detection blind area is reduced, the long-distance detection capability can be ensured, and the dynamic detection range of the laser radar is increased.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a signal processing method and a laser radar system. Background technique [0002] The transmitting and receiving antennas of the coaxial transceiver lidar share a coaxial optical lens, and the separation of the transmitted optical signal and the target echo signal is realized at the rear end of the optical system. Among them, the all-fiber coaxial transceiver technology is a new type of coaxial transceiver technology, which can be used in laser radar to form an all-fiber transceiver structure with fiber lasers, which is called pulsed all-fiber coaxial transceiver laser radar. This kind of laser radar has the characteristics of good stability, compact structure, flexible installation, and low installation and adjustment costs. [0003] The dynamic range of lidar is the ratio of the maximum power to the minimum power of the detectable signal. In the pulse laser radar system,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/481G01S7/486G01S7/4863G01S17/88
Inventor 王旭东孙康杜晨光
Owner 洛伦兹(宁波)科技有限公司
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