Research On Satellite Network Data Transmission And Tas Scheduling

In satellite communication,due to its high altitude,it can break away from the geographical bondage of the ground,and has the advantages of wide communication coverage and not affected by ground disasters,which is gradually making up for the deficiency of the ground network.However,satellites also have certain disadvantages.For example,the use of millimeter wave wireless communication makes the antenna too large,so it has the disadvantages of large power consumption and limited bandwidth.Due to the cost of launching satellites and the physical factors in space,there are the disadvantages of limited processing capacity of satellites.These problems make the satellite network can not meet the high requirements of network service put forward by people,so it is urgent to optimize the current satellite network to make full use of the limited satellite resources to meet the current communication needs.There are two challenging problems :(1)how to apply the current limited satellite resources to further improve the efficiency of data transmission and meet certain quality of service requirements;(2)How to allocate satellite resources efficiently to maximize benefits when it handles multiple tasks.Resources are limited,for satellite transmission efficiency is not high,not well support communication service quality problems and facing multi-mission satellite how to reasonable distribution of tasks,this paper respectively in the satellite network and satellite data transmission tasks scheduling for in-depth study,and put forward the solution to the problem,specific work is as follows:(1)In terms of network data transmission: the satellite network uses MPLS protocol from the ground to give full play to its advantages such as fast forwarding rate when MPLS protocol is applied in the satellite.In this paper,considering the QoS requirement of satellite network communication and the limited performance of satellite,combining the existing research of MPLS network and the current research of space Communication Protocol specification(SCPS),we design the high-speed data transmission of AOS frame based on label switching,which further optimizes the current satellite network.To meet the QoS requirements of satellite network,a high response ratio polling scheduling algorithm(HRNWRRS)with adaptive weights is proposed.This algorithm can sense the storage capacity of processor and the service level of data,and can complete data transmission safely and meet the QoS requirements of network.Finally,this scheme is verified on FPGA.(2)In terms of satellite mission scheduling: With the increase of quantity and corresponding space mission satellite,the satellite mission planning become the problems to be solved,in order to solve this problem,this paper has stability and periodicity and satellite orbit satellite mission has timeliness and continuity,and so on and so forth,by building a mathematical model of satellite mission planning was proposed based on satellite task scheduling algorithm BAS.BAS algorithm is possible to solve NP problems such as satellite scheduling because of its monomer search,few parameters and small amount of calculation.Finally,the rationality and effectiveness of the algorithm are verified by Visual Studio platform simulation.