CFDP协议在空间数据传输链路设计应用

摘要

当前我国星上数据组织管理采用位流的形式,数据的下行传输没有实现保证数据可靠性的机制,所有数据按比特流顺序传输完成即结束,无法保证文件的有效性与完整性.空间数据系统咨询委员会提出了可靠数据文件传输标准CFDP协议,其数据丢失与错误检测重传机制可以有效解决该问题.本文结合航天工程经验搭建空间数据管理系统,采用软硬件协同机制在空间数据传输链路中设计实现了CFDP协议延时NAK模式文件传输.测试结果表明文件数据传输完整准确,方案设计可靠有效.%The organization and management of spaceborne data in our country now is in the form of bit stream, and the downlink transmission does not implement mechanism of guarantee the data reliability, all data transmission in the bitstream order to complete the end , which can not guarantee the validity and integrity of the data transmission.CCSDS File Delivery Protocol (CFDP) can effectively solve this problem for the retransmission mechanism of data lose and error detection. This paper proposes one spaceborne data handling system which based on satellite engineering experience , also cooperates the hardware and software to implement the deferred NAK model of CFDP protocol in spatial data transmission link.The results show that the file data delivery is complete and accurate , and the scheme design is reliable and effective.