图像在战术数据链中的可靠传输协议研究

Study on Reliable Transmission Protocol of Image Transmitting in Tactical Data Link

在战术数据链中传输图像文件,对传输的可靠性要求较高,重传协议的性能优劣直接影响图像战术信息共享的服务质量(Qo S),图像文件的报文全部被正确接收,才能在接收端正确显示图像战术信息。研究利用分数阶傅里叶变换处理算法将图像信息变换到分数阶域进行传输,可以容忍无线链路有部分丢包,一定程度上保证战术图像信息完整性。在此基础上,提出了一种选择性放弃重传协议,接收端根据当前数据报文的接收比例,以一定概率对丢失的报文进行重传请求。仿真结果表明,选择性放弃重传协议保证战术图像一定的正确接收比例,确保战术信息正确显示,同时提升了系统的传输效率,降低了战术图像的传输时延。

Information in traditional tactical image can be displayed only in the image packet successfully in tactical data link （TDL） file transmission protocol, files in TDL requires high transmission reliability. Retransmission protocol is an reliability in TDL, its performance influences the effect of tactical image sharing case of receiving all of thus transmitting image essential way providing. The Fractional Fourier Transform is induced, which transforms the image information into fractional domain, for image processing before transmission. Transformed image can preserve the integrality of tactical information and tolerate some packet lost in transmission. With this understanding, a selective-drop retransmitting mechanism is proposed, which requests for lost packets with a certain probability based on the proportion of current received packets. Simulation results showed that the proposed selective -drop retransmitting mechanism can provide availability for image sharing in TDL with specific proportion of total packets is received. It also improves transmission effective and reduces transmission delay.