XFDU标准在遥测数据定义上的应用研究与设计
doi: 10.11728/cjss2024.01.2023-0021 cstr: 32142.14.cjss2024.01.2023-0021
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谭杰：女, 1993年3月出生于湖北省恩施土家族苗族自治州巴东县. 中国科学院国家空间科学中心硕士研究生. 主要研究方向为空间数据处理与传输等. E-mail: 2665880471@qq.com
作者简介:
通讯作者:
Application Research and Design of XFDU on Definition of Telemetry Data
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摘要: 固定的星载数据格式设计会造成数据冗余, 占用遥测数据下行带宽, 导致不关注、不需要的数据被传输等问题. 参照OAIS模型中XFDU的设计思路, 提出了采用CCSDS XFDU标准进行数据格式的包装方法, 采用PUS标准的参数定义方法给出了星载数据定义的方法模型, 设计了相应的元数据schema, 元数据编码表以及进一步的XFDU格式文件. 相应设计了XFDU转换器, 支持对描述数据格式的星载二进制数据串到XML文件的转换, 基于元数据schema生成元数据文本, 并进行了相应的测试验证. 通用的XFDU转换器可以提供给不同的系统, 供其识别和解析收到的数据格式, 从而支持异构系统之间异构信息的解读. 采用XFDU可以将卫星遥测场景下的数据定义模型与OAIS模型进行衔接, 有利于星地的标准化数据流转、处理和保存, 从而进行星载数据的灵活定义, 成为定义卫星的一个手段.
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关键词:
- XML格式化数据单元(XFDU) /
- 包应用标准(PUS) /
- 数据定义 /
- 开放档案信息系统(OAIS)
Abstract: Design of fixed data format on spacecraft can cause problems such as data redundancy, unnecessary data occupying downlink bandwidth, and transferring undesired or useless data. In order to solve these problems, a data format encapsulation method which adopting CCSDS XFDU standard referencing to XFDU design method in OAIS model, and a data definition model based on parameter definition method in PUS are proposed. Corresponding designs including metadata XML schema of data definition model, metadata code table and XFDU format file are given. Then a XFDU converter was designed and tested, to support transforming binary data strings which descript data format into XML file, to generate metadata text according to metadata XML schema. A universal XFDU converter can be used in different systems to recognize and explain data format, to support heterogeneous information understanding among heterogeneous systems. Using XFDU can make the telemetry data definition model connecting to OAIS model, and will be in favor of data transferring, processing and preservation. This flexible data definition method will be a way of satellite definition. -
图 1 XFDU标准用于遥测数据的应用场景分析
Figure 1. Telemetry application scenario analysis of XFDU standard
表 3 复杂数据格式
Table 3. Complex data format
工程参数报告id 简单数据格式个数n 简单数据格式1 id 简单数据格式2 id … 简单数据格式n id 
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[1] CCSDS. CCSDS 133.0-B-1 Space Packet Protocol[S]. Washington: CCSDS, 2003 [2] CCSDS. CCSDS 732.0-B-3 AOS Space Data Link Protocol[S]. Washington: CCSDS, 2015 [3] ECSS. ECSS-E-ST-70-41C Telemetry and Telecommand Packet Utilization[S]. Noordwijk: ECSS, 2016 [4] CCSDS. CCSDS 661.0-B-1 XML Formatted Data Unit (XFDU) Structure and Construction Rules[S]. Washington: CCSDS, 2008 [5] CCSDS. CCSDS 660.2-G-2 XML Telemetric and Command Exchange (XTCE)[S]. Washington: CCSDS, 2021 [6] CCSDS. CCSDS 620.0-B-2 Standard Formatted Data Units—Structure and Construction Rules[S]. Washington: CCSDS, 1992 [7] CCSDS. CCSDS 630.0-B-1 Standard Formatted Data Units—Control Authority Procedures[S]. Washington: CCSDS, 1993 [8] CCSDS. CCSDS 632.0-B-1 Standard Formatted Data Units—Control Authority Data Structures[S]. Washington: CCSDS, 1994 [9] CCSDS. CCSDS 622.0-B-1 Standard Formatted Data Units—Referencing Environment[S]. Washington: CCSDS, 1997 [10] CCSDS. CCSDS 650.0-B-1 Reference Model for an Open Archival Information System (OAIS)[S]. Washington: CCSDS, 2002 [11] CCSDS. CCSDS 650.0-M-2 Reference Model for an Open Archival Information System (OAIS)[S]. Washington: CCSDS, 2012 [12] ISO. ISO 14721: 2003 Space Data and Information Transfer Systems—Open Archival Information System—Reference Model[S]. Switzerland: ISO, 2003 [13] DUNCKLEY M, RONEN S, HENIS E A, et al. Using XFDU for CASPAR information packaging[J]. OCLC Systems & Services, 2010, 26(2): 80-93 [14] LUCAS A. XFDU packaging contribution to an implementation of the OAIS reference model[C]//Proceedings of the International Conference on Ensuring the Long-Term Preservation and Value Adding to Scientific and Technical Data. Edinburgh: Royal Society, 2007 [15] 何杰, 屈国兴. 基于XML Schema分块的快速本体构建方法[J]. 吉林大学学报(理学版), 2022, 60(5): 1113-1122HE Jie, QU Guoxing. Fast ontology construction method based on XML Schema partition[J]. Journal of Jilin University (Science Edition), 2022, 60(5): 1113-1122 [16] GUO Bangcai. Based on DOM/AST Design Technology C Language Parser[D]. Wuhan: Wuhan University of Technology, 2011 -
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