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Single-photon laser radar underwater photon displacement correction and sounding method and device

A technology of laser radar and displacement correction, which is applied in measuring devices, radio wave measuring systems, electromagnetic wave re-radiation, etc., can solve photon refraction effects, photon transmission speed reduction, noisy photons and photon signals no longer meet high signal-to-noise, etc. problems, to achieve the effect of improving accuracy, avoiding point and sounding offset errors, and improving accuracy

Inactive Publication Date: 2020-09-15
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0004] In the prior art, when measuring based on single-photon lidar, a large number of discrete photons will be obtained, and noise photons and photon signals no longer meet the traditional high signal-to-noise. Therefore, the data processing method based on this measurement technology is different from the traditional laser Radar is also very different
In the process of using single-photon lidar for underwater topography and bathymetry, when photons pass through the atmosphere to the water surface and penetrate the water-air interface into the water, the water body will have a refraction effect on the photons and cause a decrease in the transmission speed of the photons
The influence of these two factors will cause a certain deviation in the underwater topography and bathymetry results, reducing the positioning and measurement accuracy of each photon

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  • Single-photon laser radar underwater photon displacement correction and sounding method and device
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  • Single-photon laser radar underwater photon displacement correction and sounding method and device

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Embodiment Construction

[0061] Embodiments according to the present invention will be described in detail below with reference to the drawings. When the description refers to the drawings, the same reference numerals in different drawings indicate the same or similar elements unless otherwise indicated. It should be noted that the implementations described in the following exemplary embodiments do not represent all implementations of the present invention. They are merely examples of apparatus and methods consistent with certain aspects of the present disclosure as recited in the claims, and the scope of the present invention is not limited thereto. On the premise of no contradiction, the features in the various embodiments of the present invention can be combined with each other.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technic...

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Abstract

The invention provides a single-photon laser radar underwater photon displacement correction and sounding method and device, and relates to the technical field of marine surveying and mapping. The method comprises the steps: obtaining the pointing angle of photons transmitted by single-photon laser radar, a water surface photon signal returned by the photons transmitted by the single-photon laserradar, and the coordinates of a water bottom photon signal; performing sea wave fitting according to the water surface photon signal, and determining a sea wave model; determining an intersection point of the photons and a water-gas interface according to the coordinates, the pointing angle and the sea wave model of any one underwater photon; determining an underwater displacement error of the photons according to the intersection point, the sea wave model and the pointing angle; and correcting the coordinates of the underwater photon signal according to the underwater displacement error. Seawave modeling is carried out through water surface photon signals, and intersection points of photons and a water-gas interface are determined. An underwater photon displacement error is determined according to a spatial structure relationship of a photon propagation path. Refraction caused by sea waves and displacement caused by photon speed changes are effectively avoided, and the data accuracyis improved.

Description

technical field [0001] The present invention relates to the technical field of marine surveying and mapping, in particular to a single-photon lidar underwater photon displacement correction and sounding method and device. Background technique [0002] With the development of marine surveying and mapping technology, laser radar sounding technology, as an important branch of laser radar, has also developed rapidly in recent years. And it has played an important role in the fields of shallow sea area survey, river bathymetry and underwater topography surveying and mapping. [0003] Single-photon lidar is a new type of laser detection technology developed in recent years. Compared with traditional full-waveform lidar, single-photon lidar has a higher pulse transmission repetition frequency, and uses extremely sensitive and high-receiving devices, which can detect and accept The echo envelope amplitude detection of hundreds or even thousands of photons is transformed into the de...

Claims

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Application Information

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IPC IPC(8): G01S7/497G01S17/10G01S17/88
CPCG01S7/497G01S17/10G01S17/88
Inventor 谌一夫乐源陈刚陈伟涛董玉森王力哲
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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