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Distance measurement precision assessment method in single-photon laser radar multi-detector condition

A laser radar and detector technology, which is applied in the field of ranging accuracy evaluation of pulsed ranging laser radar, can solve the problem that the single-photon laser radar ranging accuracy analysis model is not fully given and other problems

Active Publication Date: 2018-08-24
WUHAN UNIV
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Problems solved by technology

Existing research is essentially aimed at the ranging accuracy model at the detector side, but for the measurement of the same target using multiple detectors in an array, that is, the single-photon lidar ranging accuracy analysis model for the target side has not yet been fully provided.

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Embodiment

[0023] First introduce the theoretical basis required by the present invention:

[0024] 1. The theoretical model of single-photon lidar detection

[0025] For pulsed ranging lidar, considering atmospheric attenuation, the received signal can be abstracted into the transmitted signal after two Fresnel diffractions and one target reflection. Therefore, for typical planar diffuse reflection targets, Gaussian can be used. The function and its characteristic parameters approximately describe the effective pulse echo model, namely:

[0026]

[0027] Among them, N s is the average number of signal photons in a single pulse, σ s is the pulse width of the received signal, f n is the number of noise photons per unit time (ie, the frequency of noise photons), and exp() is an exponential function.

[0028] The total number of noise photons N n can be described as N n =f n T, where T is the range gate time length of the receiving system. In order to ensure that the lidar can recei...

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Abstract

The present invention relates to a distance measurement precision assessment method in a single-photon laser radar multi-detector condition. The method comprises the steps of: establishing a distancemeasurement precision model of a single-photon laser radar in a multi-detector condition, wherein the distance measurement precision is formed by distance measurement errors and random errors; and obtaining a mathematical relationship of the distance measurement precision and system parameters of a laser radar, measured target parameters and environmental parameters when measurement. According tothe system parameters of the laser radar, the measured target parameters and the environmental parameters when measurement, the distance measurement precision of the single-photon laser radar can be rapidly assessed. The distance measurement precision assessment method has a good backward compatibility, when the number of the detector is equal to 1, the method provided by the invention is the sameas a current single-photon laser radar distance measurement precision assessment method in a single detection condition, and can directly replace the single-photon laser radar distance measurement precision assessment method in the single detection condition.

Description

technical field [0001] The invention relates to a method for evaluating the ranging accuracy of a pulsed ranging laser radar, in particular to a method for evaluating the ranging accuracy of a single-photon laser radar for the same target under the condition of multiple detectors. Background technique [0002] Different from the traditional linear system lidar, the single photon lidar can only detect the presence or absence of the signal, but cannot detect the size of the signal. Therefore, the lidar based on the single photon detection system records not the waveform linearly related to the signal intensity, but the signal intensity. The time-stamps of detected single-photon events are recorded, and the output can be understood as consisting of blank areas with no signal and discrete points where single-photon events are detected. The single-photon detection system has high utilization rate of signal photons and relatively small detector noise. Therefore, the single-pulse e...

Claims

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Application Information

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IPC IPC(8): G01S7/497
CPCG01S7/497
Inventor 李松马跃周辉田昕杨晋陵高俊玲黄科张智宇张文豪余诗哲
Owner WUHAN UNIV
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