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Underwater laser ranging method

A distance measurement method and underwater laser technology, applied in the direction of measuring devices, radio wave measurement systems, electromagnetic wave re-radiation, etc., can solve the problems of affecting the ranging accuracy and range, reducing the target contrast, and obliterating the target signal. , to achieve the effect of improving ranging accuracy and ranging range, improving target contrast, and suppressing backscattering

Inactive Publication Date: 2019-04-16
GUILIN UNIV OF ELECTRONIC TECH
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AI Technical Summary

Problems solved by technology

Traditional pulse laser ranging is seriously affected by underwater backscattering. Strong backscattering will obliterate the target signal, reduce the target contrast, and affect the ranging accuracy and range.

Method used

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Embodiment Construction

[0017] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0018] The present invention relates to a method suitable for underwater laser ranging. Through the method of the present invention, underwater backscattering can be effectively suppressed, the signal-to-noise ratio can be significantly improved, and it can be applied to various complex underwater environments. Improve underwater ranging accuracy and ranging range.

[0019] Such as figure 1 Shown, a kind of underwater laser ranging method comprises the following steps:

[0020] Gaussian laser pulses are emitted by an optical transmitter;

[0021] The Gaussian pulse parameters are modulated according to the specific underwater conditions, including pulse width 2τ, modulation frequency f c , modulation depth m. Wh...

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Abstract

The invention provides a modulation laser ranging method for underwater ranging, relating to the technical field of underwater detection. The method comprises specific steps that a light emitter emitsGaussian pulse, performs cosine modulation on the Gaussian pulse, adjusts pulse width, modulation frequency and modulation depth and other parameters, and selects a proper parameter according to actually detected seawater depth; and modulated Gaussian pulse passes a transfer medium and then arrives at a target, is reflected by the target and returns through the same medium, an echo signal is received by a high-speed detector, the modulated signal is extracted and undergoes microwave signal treatment, and a treatment result peak is corresponding to target distance information. The method solves problems of low signal to noise ratio of an underwater signal, poor target contrast, short distance measurement range and low accuracy caused by underwater backward scattering. The method effectively suppresses underwater backward scattering, improves signal to noise ratio of the signal greatly, is suitable for various complex underwater environments, and improves underwater distance measurementaccuracy and prolongs distance measurement range.

Description

technical field [0001] The invention mainly relates to the technical field of underwater laser ranging, in particular to a method for modulating laser underwater ranging. Background technique [0002] Underwater ranging technology has important applications in civil fields such as underwater engineering installation and maintenance, search of submarine sunken ships and aircraft wreckage, marine ecological observation, and military fields such as underwater mine detection, submarine detection, and anti-submarine. [0003] In the prior art, sonar ranging technology is widely used in the distance measurement of underwater targets. It utilizes underwater acoustic transducers to transmit and receive acoustic signals, and determines the target object distance according to the round-trip time of the beam in water and the speed of sound. Because the sonar ranging technology is affected by the thermocline on the sound field distribution, the sonar ranging technology will measure wron...

Claims

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Application Information

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IPC IPC(8): G01S17/10
CPCG01S17/10
Inventor 李天松周晓燕陈名松赵利周海燕高翔张浩强杨溢凡
Owner GUILIN UNIV OF ELECTRONIC TECH
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