ISR-oriented 3D Battlefield Situation Visualization Technology

With the development of modern information-based war,the practical significance of military command automation system becomes more and more prominent,and the ISR(Intelligence,Surveillance,Reconnaissance)system for warfighter emerges at the historic moment.In the modeling of ISR system,3D battlefield situation visualization technology is an important part,so it has been widely paid attention to.The research of 3D battlefield situation visualization mainly includes two aspects: large-scale terrain visualization and electromagnetic environment visualization,among which radar visualization is the key link of electromagnetic environment visualization.In battlefield situation visualization,there are still some problems,such as low efficiency of data scheduling in large scale terrain smoothing and too much time to calculate radar blind area affected by terrain at multiple heights.In order to meet the real-time and authenticity requirements of 3D battlefield rendering,this dissertation needs to address the following issues: 1.Process terrain elevation data to realize fast scheduling in the terrain smoothing process.2.Considering the terrain influence of battlefield space,the blind area of radar affected by terrain at multiple heights can be quickly solved.3.Visualize the multi-radar coverage,and present the radar situation distribution visually and accurately.4.Combine the above methods to develop an ISR-oriented battlefield situation visualization platform to enhance the commander’s battlefield perception ability.This dissertation carries out research on the above problems,and the main work contents are as follows:(1)A fast scheduling method for tile elevation data in terrain smoothing was proposed to solve the problem that terrain roaming is not smooth due to the time-consuming scheduling of elevation data in terrain smoothing.Firstly,the terrain elevation data is preprocessed to generate the elevation difference file.Then,schedule the elevation difference file in the terrain engine.Finally,the normal vector of boundary points is recalculated by the acquired terrain elevation value,and the terrain is rendered.Experimental results show that this method can save the time of data scheduling and improve the scheduling efficiency in terrain smoothing,so as to ensure the real-time performance of large-scale terrain roaming.(2)Aiming at the problem that it takes a long time to calculate radar blind area affected by terrain at multiple heights,a HGVI(Horizontal Greed and Vertical Inheritance)algorithm is proposed.The HGVI algorithm is an optimization strategy based on dichotomy.In the horizontal direction,it adopts the adjacent greedy algorithm to calculate radar blind area affected by terrain and reduce the sampling times.In the vertical direction,the radar detection range inheritance mechanism of adjacent altitude layers is further used to reduce the solution interval and accelerate the solution of the maximum detection range point.Experiments show that,compared with the dichotomy method,the computational efficiency of HGVI algorithm is improved by 26.87% to 63.71%,which can meet the application requirements of calculating radar blind area affected by terrain at multiple heights at one time.(3)Aiming at the problem of overlapping envelopment resulting in rendering distortion in multi-radar 3D envelopment visualization,a multi-radar 3D envelopment fusion algorithm was proposed to solve the overall detection range of multi-radar,and the feasibility of the algorithm was verified by experiments.In addition,the dual depth peeling algorithm is used to achieve the transparent rendering effect of multi-radar envelope.The experimental results show that the algorithm can better present the visual effect of multi-radar envelope and directly reflect the electromagnetic state distribution of radar.(4)In order to meet the requirements of 3D battlefield situation visualization,the research results obtained in this dissertation on large-scale terrain visualization and radar visualization are integrated into the ISR-oriented battlefield situation visualization platform.The platform can display 3D geographical scenes,display radar detection range and display integrated two and three dimensional situations,which is convenient for the commander to roam the terrain quickly and grasp the global electromagnetic situation,and has high engineering value.