Distance measuring system and method based on dual-channel single-photon detection and two-dimensional cross-correlation

A single-photon detection and ranging system technology, which is applied to radio wave measurement systems, measurement devices, electromagnetic wave reradiation, etc., to achieve the effects of improved signal-to-noise ratio, low algorithm complexity, and high computational efficiency

Pending Publication Date: 2022-05-13
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problem that the existing photon counting laser radar system cannot obtain the distance information of the target to be measured with high efficiency under low signal-to-noise ratio, and to provide a dual-channel single-photon detection and two-dimensional cross-correlation Ranging system and ranging method based on the ranging system to realize high-efficiency measurement of target distance under low signal-to-noise ratio by photon counting

Method used

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  • Distance measuring system and method based on dual-channel single-photon detection and two-dimensional cross-correlation
  • Distance measuring system and method based on dual-channel single-photon detection and two-dimensional cross-correlation
  • Distance measuring system and method based on dual-channel single-photon detection and two-dimensional cross-correlation

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Embodiment 1

[0066] Such as figure 1 , figure 2 As shown, a ranging system based on dual-channel single-photon detection and two-dimensional cross-correlation, including a pulsed laser emission unit 1, a dual-channel single-photon detection unit 2, a dual-channel time interval measurement unit 3, and two-dimensional cross-correlation distance estimation device 4;

[0067] The pulsed laser emitting unit 1 is used to inject the emitted light pulses into the target 5 to be measured, and its timing output is connected to a timing input of the dual-channel time interval measurement unit 3;

[0068] The dual-channel single-photon detection unit 2 is located on the reflection optical path of the target 5 to be measured, and is used to detect the light pulse reflected by the target 5 to be measured;

[0069] The dual-channel single-photon detection unit 2 includes two light-receiving components and two detectors, each detector is arranged on the outgoing light path of the light-receiving compon...

Embodiment 2

[0109] Such as image 3 As shown, the difference between this embodiment and Embodiment 1 is that the dual-channel single-photon detection unit 2 includes a light receiving component and a 1:1 beam splitter; the 1:1 beam splitter is located on the outgoing optical path of the light receiving component, Divide the outgoing light of the light receiving component into two paths and send them to two detectors respectively.

[0110] The dual single-photon detection channel composed of a light-receiving component, a 1:1 beam splitter and two detectors collects and detects the echo photon signals returned by the target 5 to be measured, and at the same time, the two detectors respectively send the echo The photon pulse signal generated by the photon signal is sent to timing port 1 and timing port 2 of the dual-channel time interval measurement unit 3 .

[0111] The remaining systems of the second embodiment are the same as those of the first embodiment.

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Abstract

The invention relates to photon counting laser radar ranging, in particular to a ranging system and method based on dual-channel single-photon detection and two-dimensional cross-correlation, and solves the technical problem that an existing photon counting laser radar system cannot efficiently acquire and measure distance information of a target to be measured under a low signal-to-noise ratio. The system comprises a pulse laser emission unit, a dual-channel single-photon detection unit, a dual-channel time interval measurement unit and a two-dimensional cross-correlation distance estimator. The pulse laser emission unit is used for emitting an emitted light pulse to a to-be-detected target; the dual-channel single-photon detection unit comprises a light receiving assembly and two detectors; two output ends of the dual-channel time interval measurement unit are respectively connected with two input ends of the two-dimensional cross-correlation distance estimator; and the other input end of the two-dimensional cross-correlation distance estimator is used for collecting a system instrument response function group, and the output end of the two-dimensional cross-correlation distance estimator is used for outputting a distance estimation value, so that high-efficiency measurement of the distance of the to-be-measured target under the low signal-to-noise ratio of photon counting is realized.

Description

technical field [0001] The invention relates to a photon counting laser radar ranging device and a ranging method thereof, in particular to a ranging system based on dual-channel single-photon detection and two-dimensional cross-correlation and a method for using the ranging system. Background technique [0002] LiDAR performs ranging and imaging of the target scene by emitting a laser beam and detecting the return light intensity and flight time. It has a wide range of application requirements in the fields of remote sensing mapping, automatic driving, aircraft landing collision avoidance, and robot navigation. The rapidly developing photon-counting lidar technology can detect a single photon and measure the moment of arrival of the photon with picosecond-level high time resolution. Distance and three-dimensional information acquisition. [0003] Photon counting lidar generally uses binarized single-photon detectors, which can only distinguish the presence or absence of ph...

Claims

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Application Information

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IPC IPC(8): G01S17/10G01S7/4865
CPCG01S17/10G01S7/4865
Inventor 王晓芳张同意康岩李力飞薛瑞凯孟凡星
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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