ISO 20217-2015 pdf free.Space data and information transfer systems – Spacecraft onboard interface services – File and packet store services. A tile store is considered to be a tile syseni and the associated storage medium. At the highest level a tile system is a way to organize, store, retrieve, and manage information on a permanent storage medium. File stores manage permanent storage and form an integral part most onboard spacecraft data handling systems. Different types of file systems (and file stores) may be considered: a) Flat file systems. Designed to not have subdirectories. Everything is stored in the rct level 01 the storage media. b) Hierarchical file systems. Designed to organize inforn’iaion in directories in a tree- like structure. Either of these may be used to support the FPSS services and no restriction is imposed on the type of file store. This approach allows complete independence from the technology used to implement the file store. The way in which this mapping is performed is implementation- specific. The FPSS allow for multiple client processes on multiple machines fbr both accessing and updating tiles. Hence updates to the file from one client should not interfere with access and updates from other clients….

BS ISO 18442:2016 pdf free.Space data and information transfer systems一Space link extension一Application program interface for return all frames service. The Recommended Practice Space Link Extension—Application Program Interface for Transfrr Services—Core Specca:ion (reference [3]) specifies a C++ API for CCSDS Space Link Extension Transfer Services. The API is intended for use by application programs implementing SI_E transfer services. Reference [3] defines the architecture of the API and the functionality on a generic level, which is independent of specific SLE services and communication technologies. It is thus necessary to add service type-specific specifications in supplemental Recommended Practices. The purpose of this document is to specify extensions to the API needed for support of the Return All Frames (RAF) service defined in reference [2]. 1.2 SCOPE This Recommended Practice defines extensions to the SLE API in terms of: a) the RAF-specific functionality provided by API components; b) the RAF-specific interfaces provided by API components. and c) the externally visible behavior associated with the RAF interfaces exported by the components. It does not specify a) individual implementations or products; b) the internal design of the components; and c) the technology used fur communications. This Recommended Practice defines only interfaces and behavior that must be…

BS ISO 20205:2015 pdf free.Space data and information transfer systems – Spacecraft Onboard Interface Systems Low Data-Rate Wireless Communications for Spacecraft Monitoring and Control. 2.1 RATIONALE ANI BENEFITS Monitoring and controlling the behavior of a spacecraft and launch systems. during testing phases on ground or during nominal operations in orbit, is the key to ensuring the correct functioning of various onboard systems and structures, the responses of these systems in their operational working environments, and the long-term reliability of the spacecraft. These data are also highly significant when compiling lessons learned that will be applied to building better space systems and increasing the reliability of future space components. (Refer to reference [3] for a comprehensive overview of application domains and for a detailed summary of RF communications and restrictions in differing operational environments.) The quantity of acquired spacecraft functional data depends on the ability to monitor required parameters at precise locations within a given project time and cost envelope. Hundreds and often thousands of data measurement locations are required. steadily increasing the mass (acquisition systems. cables, and harnesses) and the project costs and time (installation and verification of each new sensor). The use of wireless technologies is foreseen to reduce…