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Method and system for enhancing detection sensitivity of photon-counting lidar by photon regulation

A lidar and photon counting technology, applied in radio wave measurement systems, re-radiation, measurement devices, etc., can solve problems such as difficulty in distinguishing noise photons and signal photons, and lidar detection and identification of long-range targets, etc. Noise photons, the effect of improving the signal-to-noise ratio

Active Publication Date: 2017-03-29
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

When measuring and imaging a long-distance target, due to the limited energy of the emitted laser pulse and the attenuation of the atmosphere, especially the reflection signal is limited by the inverse square factor of the distance, the reflected light signal will be very weak and will usually be submerged in the In background noise photons, it is difficult to distinguish noise photons from signal photons, making it difficult or impossible for lidar to detect and identify distant targets

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  • Method and system for enhancing detection sensitivity of photon-counting lidar by photon regulation

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Embodiment Construction

[0033] The present invention proposes a method for enhancing the detection sensitivity of photon-counting laser radar by using photon regulation. Carry out screening and detection to judge whether the photon carries the characteristic mark added at the time of emission. If there is a characteristic mark, it is judged as a signal photon, and if there is no characteristic mark, it is judged as a noise photon. By filtering out noise photons and retaining signal photons with characteristic marks for detection, the signal-to-noise ratio of the entire lidar system is improved. The method and system are particularly suitable for lidar operating in single photon counting mode.

[0034] The specific implementation of this method is:

[0035] 1) Regulate the emitted photon state so that it is in a quantum state with a spin angular momentum quantum number of +1 and its orbital angular momentum quantum number is -1, or make it in a spin angular momentum quantum number of -1 while its orb...

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Abstract

The invention discloses a method and a system for enhancing photon counting laser radar detection sensitivity by using photonic regulation and control. The method comprises the following steps: (1) emitting laser photons by using a laser; (2); performing characteristic marking on the laser photons emitted by the laser; (3) performing discrimination and detection on the reached photon when an optical signal is received, judging whether the photon carries a characteristic mark during emission, considering that the received photon is signal photon if the photon carries the characteristic mark during emission, and otherwise, considering that the received photon is noise photon; (4) filtering out the noise photon and only remaining the signal photon. The invention provides the method and the system for enhancing the photon counting laser radar detection sensitivity by using the photonic regulation and control, which can improve the signal-noise ratio of the entire laser radar system.

Description

technical field [0001] The invention belongs to the technical field of laser radar, and relates to a method and system for detecting sensitivity of laser radar, in particular to a method and system for enhancing the detection sensitivity of photon counting laser radar by using photon control. Background technique [0002] Lidar is an important device for ranging and imaging by emitting laser pulses and measuring the time-of-flight of the laser pulses from the emitted laser pulses reflected by the target back to the receiver. It is widely used in national defense and civilian fields. When measuring and imaging a long-distance target, due to the limited energy of the emitted laser pulse and the attenuation of the atmosphere, especially the reflection signal is limited by the inverse square factor of the distance, the reflected light signal will be very weak and will usually be submerged in the Among background noise photons, it is difficult to distinguish noise photons from si...

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Application Information

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IPC IPC(8): G01S17/08G01S17/89G01S7/48
CPCG01S7/48G01S17/08G01S17/89
Inventor 赵卫张同意姚银萍胡炳樑
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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