Laser Pulse Scattering Characteristic Of Target Above Complex Background And Its Application

When the laser pulse beam irradiates the surface of a complex target,the scattering echo in the echo signal is not only produced by the target,but also produced by the environment where the target is.According to the laser pulse beam scattering of the target in different environmental backgrounds,this paper studied separately the laser pulse scattering echo from different targets under the sea background and the typical ground background,and the scattering characteristics are applied to the simulation of laser fuze echo,which realizes the simulation of laser fuze including dynamic targets and complex background scenes.Firstly,this paper researched the calculation formula of the scattered echo when the laser pulse beam is incident onto a complex target surface,and analyzed the influencing factors of the target attitude,incident angle,pulse width and different materials on the target surface on the scattered echo.When discussing the laser pulse beam scattering of targets in the sea background,the Elfouhaily spectrum is used to construct the sea surface modeling with different wind speed and wind direction angle.Based on the measured sea surface parameters of some parts of the South China Sea,the tension spectrum is simulated by sea spectrum,and the gravity spectrum is simulated by authentic sea area parameters,and the two are combined to generate three-dimensional sea surface to improve the realism of simulation model.Based on the three-dimensional sea surface model,the scattering echo of different sea background is studied,and the composite scattering scene is constructed by adding flying targets above the sea surface,and the composite scattering echo is calculated and analyzed.Secondly,the undulating terrain surface model is established.In order to obtain the bidirectional reflectance distribution function(BRDF)of typical terrain surface,the BRDF of grassland,sandy land and bare soil were obtained by using AMBRALS inversion algorithm,BRDF model of typical terrain surface and laser BRDF measurement of laboratory material samples.The scattering echo of laser pulse beam from different types of terrain surface is emulated and discussed.The composite scattering characteristics of the terrain and the target are studied by placing the vehicle target above the ground.Finally,a laser fuze simulation system was devised,and typical scenes such as flying targets under the sea background,radar stations and dynamic vehicle targets under the ground background were constructed,and the characteristics of laser fuze echoes were emulated and discussed in combination with different parameters.The research results of this paper can enlarge the laser fuze target database and background interference database,and provide data support for the design and verification of target detection and anti-background interference technology for laser fuze equipment carried by air-to-air missiles.