Design And Implementation Of Satellite Network Link Simulation System

Satellite network has the advantages of wide coverage and high transmission rate,in recent years,it has received extensive attention from academia and business circles at home and abroad.The integration with the more mature terrestrial network can realize independent network cooperation and communication in various dimensions.Based on the principle of first-come first-served satellite spectrum and space orbit resources,satellite networks have become the key technology for countries to compete for development.In order to better build the satellite network,a lot of experiments and tests are needed to verify,for this reason,a satellite network link simulation system is designed and implemented in this paper,aiming at the intuitive and visual requirements of link data calculation,on-off switching simulation and link dynamics of satellite network,the main work of this paper is as follows:First,the generation scheme of satellite network topology snapshot and the standardized data output format of link characteristics are designed.For different types of object nodes in the satellite network,according to the real-time satellite data,different types of link on-off reports are calculated separately.Integrate relatively independent onoff reports to obtain link on-off information including all object nodes.The cell array containing all node link information is topologically divided according to a certain time length,and the divided links continue to establish connections within the time slice range.In order to make the link data more readable and extractable,a port identification and a serial number identification are added to it to obtain time slice topology link data with identification.The calculated satellite network time slice topology data has good readability and importability,and provides data support for link on-off,switching simulation and dynamic display simulation in the satellite network.Secondly,in order to simulate the link of the calculated satellite network data,a link simulator is designed and implemented.The link simulator can process the time slice topology link data obtained by calculation,judge the time slice position at the current moment according to its own link simulator type,and issue the flow table of the corresponding link simulator type,and as time goes by,the link simulator internally updates the flow table of the corresponding time slice to realize link switching,At the same time,relevant information such as the current time,the time from the next time slice,and the specific object nodes of the link are printed out in real time.In addition,the link simulator implements simulated TC flow control by establishing queues at the output ports of the packets.Finally,in order to display and simulate the satellite network link and realize the real-time display of the change information of the network node link,a dynamic display interface of the satellite network link is designed.Display Tool Select Satellite Kit STK.According to the time slice topology link data obtained by calculation,the interface clearly displays the movement process of the satellite,the dynamic establishment process of the satellite network link,and the link switching process in the interface according to the scene time.In addition,while the interface simulates the satellite network scene,the console part outputs the time information synchronized with the satellite network scene and related node link information in real time,making the satellite network display interface more abundant.