Method for dynamic sea surface laser pulse wave beam echo simulation

Abstract

The invention relates to a method for dynamic sea surface laser pulse wave beam echo simulation. The method for dynamic sea surface laser pulse wave beam echo simulation comprises the following steps that according to a sea spectrum statistic model, a dynamic sea surface is generated by means of the reverse-FFT technology, and the parameters such as the wind speed, the wave height and the sea wave period are considered through the model; space energy distribution and the pulse shape of each emitted laser wave beam are measured, space-time distribution of any laser wave beam is obtained through fitting, and section spatial light intensity distribution at any distance is determined based on energy conservation; a laser radar wave beam back scattering echo radar equation is established based on the radiometry, rough surface processing is conducted on a water surface element, and the water surface element is expressed through a bidirectional reflection distribution function; drawing, coloring, rendering, real-time animation, hidden-line elimination and clipping of the scene are completed based on a computer graphic base OpenGL. The method for dynamic sea surface laser pulse wave beam echo simulation can be applied to different sea condition model machine dynamic intersection virtual experiments, facilitate development of sea surface pulse echo scattering mechanism study, and save a large amount of cost.

Description

technical field [0001] The invention relates to the research field of target and ambient light scattering characteristics, in particular to a laser pulse-echo simulation technology for arbitrary beams on rough sea surfaces. Background technique [0002] In the development process of the short-range laser radar system, it is necessary to establish a sea background echo simulation model to provide the necessary theoretical basis for the research of data acquisition, feature extraction, control and identification of the echo characteristics of maritime targets. At present, the development of short-range laser radar systems relies on a large number of sea experiments, which consumes a lot of manpower and material resources, and it is difficult to grasp the mechanism and laws. [0003] Among the retrieved domestic and foreign published documents, there are papers based on the Cox-Munk model of the sea surface slope that introduce the reflection model of the Gaussian beam on the s...

AI Technical Summary

Problems solved by technology

At present, the development of short-range laser radar systems relies on a large number of sea experiments, which consumes a lot of manpower and material resources, and it is difficult to grasp the mechanism and laws

[0003] Among the retrieved domestic and foreign published documents, there are papers based on the Cox-Munk model of the sea surface slope that introduce the reflection model of the Gaussian beam on the sea surface. relationship, but no impact of pulse scattering, roughness of water surface elements, simulation based on ocean spectrum model, etc.

Another paper introduces the simulation method of bidirectional reflection of laser Gaussian beams on the sea surface, using the masking function to consider the masking of the surface elements, but this method cannot be used for dynamic sea surface echo simulation

In summary, the prior art does not disclose a simulation method for laser pulse echoes of arbitrary beams on the dynamic sea surface

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