Design of Simulation Model on the Battlefield Environment ZHANG Jianli 1,a, ZHANG Lin 2,b *, JI Lijian 1,c, GUO Zhongwei 1,d

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1 Internatonal Conference on Materals Engneerng and Informaton Technology Applcatons (MEITA 2015 Desgn of Smulaton Model on the Battlefeld Envronment ZHANG Janl 1,a, ZHANG Ln 2,b *, JI Ljan 1,c, GUO Zhongwe 1,d 1 Army Offcer Academy of PLA,Hefe,230031,Anhu,Chna 2 Dept. of Computer Engneerng,Anhu SanLan Unversty,Hefe,230000,Anhu,Chna a wjxc1982@126.com b srenrabbt@sna.com d guo_zw@126.com Keywords: Dgtal earth, Varable resoluton technology, Partcle system Abstract. In order to mplement the nformatzaton under the condton of forces global tranng requrements, the paper constructed the basc process of the battlefeld envronment smulaton model, ncludng geographc smulaton model, smulaton models of meteorologcal and electromagnetc envronment smulaton model. Vrtual tranng for the combat troops have provded the certan bass. Introducton In order to meet the nformaton needs of global tranng for forces, t must buld the battlefeld envronment smulaton model. The dgtal elevaton model (DEM and mass, mult-source geographc data and remote sensng dgtal mage overlay, generated wth the actual topography, geomorphology, the matchng of the battlefeld envronment, such as coordnates, elevaton, support rapd space measurement, meteorology, electromagnetc envronment vsualzaton, adapt to the modern condton, the forces on the mountan and plan, need to wat for all sorts of complex terran n a coastal area. The paper manly studed the basc process to construct geographc smulaton model, smulaton models of meteorologcal and electromagnetc envronment smulaton model. The Geographcal Smulaton Model Geographc smulaton envronment should be able to support a vrtual browse, three-dmensonal pont, query place name, accurate postonng, dstance measurement, area measurement, vsblty analyss, and other functons, and can be deployed combat forces and support electronc sand table deducton, etc. Buldng Dgtal Earth. Dgtal earth s a based on geographc coordnates (longtude and lattude, mult-resoluton, huge amounts of data and mult-dmensonal dsplay of vrtual system, t requres that all the nformaton on the dgtal earth. (1 Buld the coordnate system Based on mathematcal model of WGS84 coordnate system s a sphere, as shown n fgure 1. The world of any pont on a sphere coordnates can be calculated by the followng formula: double X = R cos( lat cos( lon double Y = R cos( lat sn( lon double Z = R sn( lat R for any radus, lat for ths pont of lattude (n radans, lon for the longtude of the pont where (n radans The authors - Publshed by Atlants Press 209

2 Z R P O I Y X Pt Fgure 1 WGS84 coordnate system schematc dagram (2 Buld a space object heght model The heght of the spatal object model s dvded nto fve knds: relatve to the ground, the sea bottom n the relatvely, attached to the ground, the sea bottom n the attachment, and absolute heght, through these fve hgh spatal model can accurately determne the coordnates of the object, so that you can express, ar, sea, sea surface and the surface under varous objects. (3Buld a level of detal (LOD model Level of detal model s establshed on the bass of massve amounts of data and storage. Frstly, n accordance wth the geographc coordnates of regonal classfcaton t don't number LOD data structure; Secondly, n accordance wth the LOD to physcal re-samplng of basc data, data structure to establsh varous other data fles, the hgher level the more data; Fnally accordng to the regonal the dstance from vewpont to load, the hgher the vewpont, the lower load data, data pont of vew, the lower load level s hgher. From Fgure 2 we can see by the superposton of satellte remote sensng mages and dgtal elevaton model surface features, whch s formed by the way of the real land form envronment. (4 Texture mappng Texture mappng as a knd of commonly used method of addng surface detal for the vrtual 3 D objects, s one of mportant research feld n computer graphcs, to show the object's color, texture play a key role. Accordng to the dfferent generatng method,t can be dvded nto surface texture to texture and texture two enttes. Surface texture s generated through texture mappng. Mathematcally speakng, t s a 2 D mage to the mappng of the space surface, namely the plane wth characterstcs of materal texture mage "package" onto the surface of the three-dmensonal objects. Fgure 2 renderng of large-scale terran 210

3 Geographc Data And Model Desgn. On the bass of dgtal earth, scenaro uses ntegrated large-scale, vast, mult-source data based mage data, and the world to quckly buld three-dmensonal geographc space. (1 Desgn Relatonal database Usng object-orented data model and abstract methods, usng unversal modelng language (UML, testng the semantc correctness of logcal archtecture and ntegrty, wth clear rules, can be nstantated object data model. Usng ths database retreval model quckly, mprove the effcency of handlng of geographc data, allow them to quckly retreve and update the dsplay real-tme geographc nformaton. (2 Desgn Multlayer vsual varable resoluton control To meet the needs of dfferent herarchcal levels on the natural envronment model, usng a resoluton modelng technology for dfferent applcaton layer accordng to proporton, conduct the thorough research to the show detals, and so on, so as to make the system can dynamcally accordng to the need of stuaton change resoluton, effectvely solve the massve terran data and dsplay the contradcton of lmtaton. In specfc desgn, the ntegraton of Herarchcal Varable Resoluton technology (Integrated Herarchcal Varable Resoluton, IHVR acheve the desgn requrements. IHVR s a herarchcal decomposton method for parameters of the process. Model nput parameters can be accordng to the level of change, hgh-level parameters can be nput drectly, can also be obtaned by low-level operaton parameters. Can be seen from fgure 3, n each resoluton level, the entty, process, decson-makng and control all have ths smlar exercse the functon of the recursve call. In programmng, therefore, the process s dvded nto two knds, functon process and control process of two knds of process wth common publc parent class, the realzaton of the control process s based on the functon of the lower level of process. Entty Depolymerzaton Low Resoluton Entty Mddle Resoluton Entty Entty Polymerzaton The Functon Process of Mddle Resoluton Entty Process Depolymerzaton The Process of Low Resoluton Entty The Process of Mddle Resoluton Entty Stuaton Depolymerzaton Low Resoluton Stuaton Mddle Resoluton Stuaton Stuaton Polymerzaton Entty Depolymerzaton Entty Polymerzaton Stuaton Depolymerzaton Stuaton Polymerzaton Hgh Resoluton Entty The Functon Process of Hgh Resoluton Entty Hgh Resoluton Stuaton Fgure 3 varable resoluton process control level based on IHVR (3 Desgn 3D terran reconstructon and renewal In order to mprove the speed of data loadng, prepossessng, mage, DEM, vector data after pretreatment of data as a cache on the server, so that you can speed up the data download. At the same tme the clent also uses cachng technology, namely through an area, the procedure to detect local cache frst whether there s a regonal data, f there s the drect use of the data n the local cache, otherwse the request to the server for the area of data, the server sends the data to the clent after recevng the request for the use of applcaton, the clent receves the data at the same tme, the data n a cache, so next tme browsng ths area can drectly use the data n the cache, thus saved network round trp tme, thus greatly mprove the effcency. Weather smulaton model Vvd natural envronment n accordance wth regonal characterstcs (ran, thunder and lghtnng, snow, fog can make the smulaton scene more real, you can change the vsblty of the battlefeld smulaton, to organze the mplementaton of the battlefeld reconnassance; observaton burst pont and target a certan degree of mpact. Implement specfc meteorologcal envronment smulaton, concrete s through the prncple of partcle system mplementaton. Partcle system n a 211

4 space area defnton, and then change wth tme and parameters. These parameters nclude the moton path of a partcle, color and shape. At a random tme, t may remove every object. Partcle shape may be small ball, ellpsod, cube or other shape, partcle sze and shape change over tme. Other propertes such as partcle transparency, color and movement wll be random varaton. Implementaton of smoke based on partcle system flow chart shown n fgure 4. Usng partcle system smulaton of smoke process s as follows: (1The smoke partcles are produced n the ntal frame and the follow-up frame, and n subsequent frames n the sequence of each frame as long as the change n the ntal partcle propertes. (2 Due to the shape of the actual smoke can be vared, obvously t s mpossble to completely smulate the actual stuaton. But t can be predefned by modelng a seres of dfferent shape of smoke, such as: trangles and rectangles, polyhedron, etc. There are 10 knds of dfferent shapes, such as now Numbers for them: 1, 2,..., 10, and then use random functon for explosve partcles ncrease shape propertes. Set lfe cycle of the partcle Begn Set the partcle range of ALPHA Set Color of the partcle Set Sze of the partcle Set Weght of the partcle Set Materal of the partcle Add the Operator Set the Parcle Propertes Establsh the Parcle System Add to the scene Add ejector Add the Updater Acceleraton Angular Velocty Counter Placer Emtter the partcle namber of every frame Set the poston of partcles Set the velocty of partcles Update the partcle Draw the partcle Delete the dead partcle End Fgure 4 partcle system flow chart of specal effects (3 In addton to the smoke movement n the process, the partcles velocty n the drecton of movement, and around the x,y,z three axs of rotaton. Assumes that partcles and x,y,z three axs forward nto the Angle respectvely: p, h, r and around the three axs of rotaton velocty s respectvely: w x w y and w z, f s the frst frame partcles and x,y,z three axs Angle for: p ( f = p( 1 + wx 1 h ( f = h( 1 + wy 1 r ( f = r( 1 + wz 1 (4 Due to the effect of gravty, the partcle trajectory should conform to the actual stuaton of sport, untl each frame of the partcles. The electromagnetc envronment smulaton model Electromagnetc envronment s the operatonal area of the sum total of all knds of electromagnetc radaton source sgnal. In the modern war, especally n nformaton warfare, the 212

5 electromagnetc envronment of battlefeld plays a very mportant role. Descrbe the battlefeld electromagnetc envronment, can be more realstcally, enables us to effectvely study the law of modern warfare, conducts research methods, auxlary battle command tranng, tactcal commanders and staffs, and so on. For example, In radar vsualzaton system, t s manly composed of vrtual battlefeld envronment, detecton range of radar three-dmensonal data generaton and detecton range of radar three-dmensonal vsualzaton draw three parts, the specfc system structure as shown n fgure 5. Radar Attrbute Parameter Radar Maxmum Detecton Range model Generaton Parameter Data Acquston and Preprocessng Radar Maxmum Detecton Range model Renderng Vrtual Battlefeld Envronment 3D GIS Database Meteorololgcal Database Radar Maxmum Detecton Range of the Generaton of 2D Envelope The Constructon of Radar Maxmum Detecton range 3D Model The Interference Beam Dynamc Map Radar Maxmum Detecton Range 3D Model Drawng 3D Detecton Range of Radar n the Vrtual Battlefeld Envronment Fgure 5 vsualzaton system functon dagram Vrtual battlefeld envronment contans the radar detecton range model, terran parameters of the radar detecton range model.radar detecton range model generated manly from obtan envronmental terran parameters n vrtual battlefeld envronment, use of the user to enter the radar parameters, accordng to the radar equaton under wthout nterference and nterference radar maxmum detecton range model was constructed.radar maxmum detecton range model renderng performance s manly the detecton model n the vrtual battlefeld envronment, and the ntegraton of the varous effects n radar range model drawng. Concluson Research based on the global vector geographc nformaton and magng smulaton of geographcal envronment, weather envronment and the electromagnetc envronment, under the condton of nformaton can help to deepen the understandng of the complex battlefeld envronment, can carry on the brcks wll force tranng, rch forces tranng means, vrtual tranng for the combat troops have provded the certan bass. References [1] Johnson C.R., Top Scentfc Vsualzaton Research Problems, IEEE Computer Graphcs and Applcatons, 2004, 24(4 [2] C.N. JAMES, S.R. BRODZIK et al, Radar Data Processng and Vsualzaton over Complex Terran. Weather and Forecastng, (3 [3] Zhong-feng wang, Yang Fengbao. Geodetc coordnate of the space rectangular coordnate transformaton method [J]. Journal of surveyng and mappng engneerng, 2010, 12 (2 [4] Lao Mng, L peng, Chen Ypng. Geocentrc rectangular coordnate and geodetc coordnate transformaton algorthm study [J]. Journal of electronc scence and technology, 2010, 23 (2 [5]Hgues Hoppe.Smooth Vew-Dependent Level -of-detal and ts Applcaton to Terran Renderng.2008 [6]Karl D.Lebert. Usng GIS vector data to buld vrtual envronments for agent based models. Proceedngs of 2008 Sprng smulaton conference