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Method and device for eliminating background dark noise response of laser radar

A technology of laser radar and dark noise, which is applied in the directions of measurement devices, electromagnetic wave re-radiation, and utilization of re-radiation, etc., can solve the problems of dark count noise interference, reduce false alarm rate, etc., achieve low power consumption, improve accuracy, Easy to implement and integrate effects

Pending Publication Date: 2018-08-10
苏州镭图光电科技有限公司
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Problems solved by technology

[0007] This paper proposes a lidar background dark noise elimination method, which solves the problem of the dark count noise interference of the photodetector itself in the echo signal, and can effectively reduce the false alarm rate

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  • Method and device for eliminating background dark noise response of laser radar
  • Method and device for eliminating background dark noise response of laser radar
  • Method and device for eliminating background dark noise response of laser radar

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with specific embodiments shown in the accompanying drawings.

[0035] It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0036] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

[0037] Techniques and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques and devices should be considered part of the description.

[0038] In all examples shown and discussed herein, any specific values ​​should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different v...

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Abstract

The invention provides a method and a device for eliminating background dark noise response of a laser radar. A laser radar transmits a laser pulse signal to a detection target; a receiving lens receives an optical signal reflected by the detection target and transmits it to a photoelectric detector; the optical signal is converted into an electric signal; a back-end processing circuit sets high and low voltage thresholds ThresholdH and ThresholdL, and trigger signals are generated when echo signals exceed thresholds; a trigger signal TrigL generated by a low threshold extracts trigger time information TL through a high precision time measurement module, and a trigger signal TrigH generated by a high threshold is delayed by a delay module; and when the TrigH can be received within a shorttime window TW after the TrigL trigger is received, it is considered to be a valid echo event trigger, and when the TrigH is not received within the time window, it is considered that error response is generated by a noise signal generated by the dark count of a detector; and if it is a noise signal, subsequent processing is not executed, if it is a real echo signal, TL is regarded as a differencebetween the arrival time and the transmission time and as a pulse flight time, and a target distance is solved according to the light speed, thereby reducing the false alarm rate.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a method and device for eliminating background dark noise of laser radar. Background technique [0002] Lidar is a means of active detection of space information. Its basic working principle is similar to that of traditional radar: Lidar emits laser light to the detection target, and then the receiver collects the light signal reflected by the target, and determines the target by measuring the round-trip time of the transmitted signal. Due to the advantages of high coherence, directivity, and monochromaticity of laser, the laser radar system can realize long-distance and high-precision ranging functions, and has been used in automatic driving, three-dimensional modeling of buildings, terrain mapping, rendezvous It has been applied in many occasions such as docking. [0003] Lidar often uses the pulse time-of-flight method to extract the distance signal. The basic principle i...

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Application Information

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IPC IPC(8): G01S7/487G01S17/10
CPCG01S7/4876G01S17/10
Inventor 陈忻朱俊吴小可
Owner 苏州镭图光电科技有限公司
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