A Study On Effect Of Link Disruption For Space Station

Space information has always been an important resource for the strategic development of various countries.With the development of space technology,space resource exploration activities of various countries are also increasing.As a transfer station for future manned space exploration and a testing ground for earth science and technology,the space station plays a more obvious role.While collecting spatial information,it is necessary to construct a reliable and stable spatial ground network structure to support the transmission of information.At present,some researchers have proposed a Delay/Disruption Tolerant Network(DTN)for spatial communication conditions.Based on the LTP(Licklider Transmission Protocol)Protocol in DTN and the communication environment of the space station,this paper did the following work:First,through the simulation platform,the paper studies the influence of factors such as long link time,high bit error rate and up and down channel on transmission performance in space communication.Compared the transmission performance of LTP protocol with TCP protocol in three kinds of communication situations in space station.Through the results,LTP protocol is more suitable for communication in space station.Secondly,frequent link interrupts when the station switches relay nodes or is under electromagnetic attack from other celestial objects.This paper established a communication model related to transmission such as file delivery time and effective throughput in the case of interruption based on the interactive process of file transmission under BP/LTP protocol.Considered the influence of channel bit error rate into the communication model,the BP layer was optimized,and a theoretical model related to transmission performance was established for the data size in the LTP layer under different bit error rates.Finally,designed the experimental platform to verify the models.Selected appropriate experimental parameters to observe the actual transmission in the experiment,and recorded experimental data for comparison with theoretical values.This paper established the delivery time model of the transmission files of the space station in the case of interruption based on the BP/LTP protocol.Considered the influence of bit error rate,a model of the influence of data size on the transmission performance was established to optimize the transmission performance.Through the experiments,the models are verified.