This research paper describes the design and implementation of the Consultative Committee for Space Data Systems (CCSDS) standards REF _Ref401069962 \r \h \* MERGEFORMAT [1] for Space Data Link Layer Protocol (SDLP). ...This research paper describes the design and implementation of the Consultative Committee for Space Data Systems (CCSDS) standards REF _Ref401069962 \r \h \* MERGEFORMAT [1] for Space Data Link Layer Protocol (SDLP). The primer focus is the telecommand (TC) part of the standard. The implementation of the standard was in the form of DLL functions using C++ programming language. The second objective of this paper was to use the DLL functions with OMNeT++ simulating environment to create a simulator in order to analyze the mean end-to-end Packet Delay, maximum achievable application layer throughput for a given fixed link capacity and normalized protocol overhead, defined as the total number of bytes transmitted on the link in a given period of time (e.g. per second) divided by the number of bytes of application data received at the application layer model data sink. In addition, the DLL was also integrated with Ground Support Equipment Operating System (GSEOS), a software system for space instruments and small spacecrafts especially suited for low budget missions. The SDLP is designed for rapid test system design and high flexibility for changing telemetry and command requirements. GSEOS can be seamlessly moved from EM/FM development (bench testing) to flight operations. It features the Python programming language as a configuration/scripting tool and can easily be extended to accommodate custom hardware interfaces. This paper also shows the results of the simulations and its analysis.展开更多
关联数据的应用正迅速发展并涉及到商业、媒体、出版、政府等领域。在关联数据发布、消费和再创造的过程中,必然涉及参与者的利益问题,需明确不同类型和归属的数据(或数据集)的所有权、发布权、使用权、收益权等。关联数据的发展迫切需...关联数据的应用正迅速发展并涉及到商业、媒体、出版、政府等领域。在关联数据发布、消费和再创造的过程中,必然涉及参与者的利益问题,需明确不同类型和归属的数据(或数据集)的所有权、发布权、使用权、收益权等。关联数据的发展迫切需要相关的许可协议。目前关联数据用到的协议主要有CC(知识共享)家族的CCBY-SA、CC0、CC BY、CC BY-NC和ODC(开放数据共用组织)的PDDL(公共领域奉献和许可),ODbL(开放数据许可)、ODC-By(开放数据共享署名许可),以及OGL(Open Government License,开放政府许可协议)等。对开放数据相关许可协议在国内的应用提出建议。展开更多
文摘This research paper describes the design and implementation of the Consultative Committee for Space Data Systems (CCSDS) standards REF _Ref401069962 \r \h \* MERGEFORMAT [1] for Space Data Link Layer Protocol (SDLP). The primer focus is the telecommand (TC) part of the standard. The implementation of the standard was in the form of DLL functions using C++ programming language. The second objective of this paper was to use the DLL functions with OMNeT++ simulating environment to create a simulator in order to analyze the mean end-to-end Packet Delay, maximum achievable application layer throughput for a given fixed link capacity and normalized protocol overhead, defined as the total number of bytes transmitted on the link in a given period of time (e.g. per second) divided by the number of bytes of application data received at the application layer model data sink. In addition, the DLL was also integrated with Ground Support Equipment Operating System (GSEOS), a software system for space instruments and small spacecrafts especially suited for low budget missions. The SDLP is designed for rapid test system design and high flexibility for changing telemetry and command requirements. GSEOS can be seamlessly moved from EM/FM development (bench testing) to flight operations. It features the Python programming language as a configuration/scripting tool and can easily be extended to accommodate custom hardware interfaces. This paper also shows the results of the simulations and its analysis.
文摘关联数据的应用正迅速发展并涉及到商业、媒体、出版、政府等领域。在关联数据发布、消费和再创造的过程中,必然涉及参与者的利益问题,需明确不同类型和归属的数据(或数据集)的所有权、发布权、使用权、收益权等。关联数据的发展迫切需要相关的许可协议。目前关联数据用到的协议主要有CC(知识共享)家族的CCBY-SA、CC0、CC BY、CC BY-NC和ODC(开放数据共用组织)的PDDL(公共领域奉献和许可),ODbL(开放数据许可)、ODC-By(开放数据共享署名许可),以及OGL(Open Government License,开放政府许可协议)等。对开放数据相关许可协议在国内的应用提出建议。
