A Research On The Modeling And Simulation Of The Armed Forces Police Tactical Internet

Tactical Internet, a compositive tactical front-line data communication network,is based on the standard protocol TCP/IP, which can provide the safe steady seamless wireless nertwork connection for the tactical communication command and control system of the all levels compaign army.Along with the fast development of the wireless communication technology, the wireless packet network is rapidly becoming the important elements of the modern military communication.Ad hoc network is a kind of distributing self-organized wireless packet network made up of wireless mobile nodes.Therefore, it can work without any from fixed basic network.It is so easy to deploy in short time and robust to destruction that Ad hoc network greatly adapt to the tactics-martial and disaster-relieving situation, especially adapt to the remote area's communication where can't build up the basic communication establishment.The armed forces police army is the important force of the country to protect the civic life and estate, fight against the terrorism and dispose the gusty event.It require to build up the information system to support C4ISR quickly and effectively in the accident area.Thus Ad hoc network is choosen to design the armed forces police army tactical internet.We must research the Ad hoc network protocol.It has important practical significance for improving the armed forces police army's battle ability to set up the tactical internet with the armed forces police army's operation characteristics finally.At first, the article gives the general introduction about the wireless packet network and forward the layered network model based on Ad hoc network. Then, it explains the Ad hoc network's key technologies:MAC protocol and route protocol in detail. In accordance with network model, we use the OPNet simulation software to build up the simulation framework of the armed forces police army's tactical internet. The framework will be mainly used to research the MAC protocol and route protocol.MAC protocol is the rule which controls the network nodes to access the wireless share channel. Ad hoc network's no-center and multi-hop structure make the MAC protocol design very challengable.In the article we detailedly discuss the operation principle on the IEEE802.11 DCF(distributed coordination function) access mechanism which is mainly used by Ad hoc network and we get the theoretic throughput through the two-dimension Markov chain model. In the end, we compare the theoretical value with the simulation result and compare each other validity. The paper analyzes the factor which will influence the capability of the channel access throughput.It will provide useful reference to understand the Ad hoc network's mac layer operation principle and the appliance of the Ad hoc in the armed forces police army's tactical internet.