深空通信中异步否定确认型CFDP协议延时估算

Transmission Time Delay Estimation of Asynchronous Negative Acknowledgement CFDP Protocol in Deep Space Communication

为了确定CCSDS建议的高级在轨系统中CFDP协议在深空通信环境下的适应性,研究CFDP中异步否定确认型文件传输协议的传输机理,给出这种传输方式下文件传输时延的估算方法。分析误码率、传输速率、协议数据单元的大小和数量,外部触发事件的触发时刻和NAK信息的频率等因素对传输时延的影响,得到深空通信中典型应用条件下对误码率的要求,为它在深空通信中的进一步应用和改进提供了参考。

To adapt the condition of communication in deep space and choose the appropriate protocol,the transmission mechanism of Asynchronous Negative Acknowledgement CFDP protocol in CCSDS AOS is investigated.And the means of transmission time delay estimation under ANACFDP protocol are provided.Some factors that affect the transmission time delay,such as bit error rate,data rate,size and number of PDU,trigger time of external event trigger,and frequency of NAK message,are simulated and analyzed.The limit of bit error rate in deep space communication is calculated.This paper provides a reference for the application and improvement of CFDP in deep space communication.