Research On Area Electromagnetic Environment Effect Situation Generation Technology Based On GIS

Scientifically and accurately characterizing the situation of electromagnetic environmental effects is one of the key factors for winning joint operations in the future.In order to enable commanders to grasp the situation of electromagnetic environmental effects,this paper studies the situation generation technology of on-site electromagnetic environment effects based on GIS(Geographic Information System).First,the Cesuim geographic information system is used to construct a large-scale three-dimensional virtual geographic environment.On the basis,the visual representation of the electromagnetic environment,the three-dimensional visualization of the radar detection range and the track fitting are studied.The research contents are as follows:(1)An improved visualization representation method of the electromagnetic environment is proposed.Using the spherical regular grid model to divide the three-dimensional electromagnetic space,this paper organizes the discretized electromagnetic environment data,and characterizes the influence of the curvature of the earth’s surface on the visualization of the electromagnetic environment,compared with the discretized electromagnetic environment data using the rectangular parallelepiped grid model more precise.A terrain reuse algorithm is obtained by improving the traditional terrain extraction algorithm,which saves the time of querying terrain elevation data and improves the efficiency of using the ITM model to calculate the power of sampling points.In this paper,when the ray-casting algorithm is used to draw the volume data of the electromagnetic environment,the upper and lower top surfaces of the traditional cube bounding box are improved to curved surfaces,and a kind of arc-top volume bounding box is obtained,which reduces invalid resampling points and improves the rendering efficiency.efficiency.According to the calculated electromagnetic wave power of the sampling point,color and transparency are used to intuitively represent the strength of the electromagnetic wave power.Through the simulation test,the effect diagram of the electromagnetic environment situation of the three frequency equipments in the area is realized.(2)The three-dimensional visualization representation of radar detection range is studied.In this paper,the mathematical model based on the radar transmission power and the antenna pattern factor is used,and the maximum detection distance of the radar at each angle is calculated by combining the corresponding azimuth and elevation angles,so as to determine the coordinates of the sampling point.The sampling points are connected into a regular grid shape in the form of quadrilateral primitives,and the three-dimensional radar detection range under the condition of no interference and the presence of a single interference source is visualized through simulation experiments.(3)The track fitting in the 3D scene is studied.In actual combat,the electromagnetic environment effect situation will change with the displacement of frequency equipment.In order to intuitively display the change process,it is first necessary to fit the track of the equipment.Mark the track control points on the three-dimensional map,use the cubic B-spline algorithm,and add auxiliary control points to fit the track curve,improve the fitting accuracy,and at the same time make the track curve pass through the starting point and target point of the aircraft,and the direction of the tangent vector between the starting point and the target point is the same as the speed direction of the aircraft entering the starting point and flying out of the target point.