| Sample |
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The data within the smallest discrete measurement. |
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| Satellite |
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The orbital system comprising the spacecraft bus, instruments, and any other payloads. |
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| Satellite Failure |
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Occurs when one of the primary instruments fails to meet the specified performance required to produce its mission criticality level 1 products. (TBR). |
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| Scalability |
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The ability of a hardware or software system to continue to function according to original specifications when it is enlarged (e.g., in terms of processing, storage, or throughput capacity) and to take performance advantage of the increase. |
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| Segment |
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A major product, service, or facility of the system. For GOES-R Program, two segments are defined: Ground Segment and Space Segment. |
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| Sensor Unit |
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Refers to the unit that contains the optics when pertaining to the instrument. |
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| Service Request |
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Any type of request for information or service including requests for products. |
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| Service Response |
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A response to the customer regarding a service request. |
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| Shall |
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Use of this imperative word in a written statement designates a requirement. |
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| Shall Allow (Ground Segment) |
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See “Shall be capable” |
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| Shall be capable (Ground Segment) |
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The term shall be interpreted to mean that the function, service or capacity described is a mandatory requirement for the GS, but that the capability, service or capacity may not necessarily be exercised continuously (i.e., event driven, operator selected, operator initiated, etc.) |
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| Shall enable (Ground Segment) |
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See “Shall be capable” |
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| Shall have the capability (Ground Segment) |
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See “Shall be capable” |
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| Shall permit (Ground Segment) |
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See “Shall be capable” |
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| Shall provide the capability (Ground Segment) |
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See “Shall be capable” |
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| Should |
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Designates a desired level of performance the government would like the contractor to strive towards achieving and is synonymous with the term “goal”. |
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| Simulated data |
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Data generated to mimic the characteristics and content of real data. |
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| Single Point Failure |
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A failure of a hardware or software element with no redundancy. |
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| Single string of equipment |
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A system capable of performing all required functionality from data input through data output. |
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| Software |
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Computer programs, procedures, rules, and associated documentation and data pertaining to the development and operation of a computer system. Software also includes Commercial Off-the-Shelf (COTS), Government Off-the-Shelf (GOTS), Modified Off-the-Shelf (MOTS), embedded software, reuse, heritage, legacy, auto generated code, firmware (instructions, logic, or associated data loaded into programmable devices (e.g. ASICs and FPGAs), and open source software components. |
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| Space and Launch Segment Availability |
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The probability that the Space and Launch Segment can be successfully used for any specified mission over the stated period of time; this is a probability of success. |
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| Space Packet |
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Protocol Data Units that form the CCSDS packets |
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| Space Segment |
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The Space Segment (SS) consists of a constellation of geostationary satellites and required pre-launch ground support equipment. |
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| Spacewire |
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SpaceWire is a standard for high-speed links and networks for use onboard spacecraft, easing the interconnection of: sensors, mass-memories, processing units, and downlink telemetry sub-systems. SpaceWire equipment is connected together using SpaceWire links which are: serial, high-speed (2 Mbits/sec to 200 Mbits/sec), bi-directional, and full-duplex. Application information is sent along a SpaceWire link in discrete packets. Control and time information can also be sent along SpaceWire links |
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| Spacecraft |
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For GOES-R, the spacecraft consists of the spacecraft bus, auxiliary communication services payloads, and Magnetometer. |
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| Spacecraft Bus |
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The spacecraft bus consists of the necessary hardware and software required to accommodate the instruments and auxiliary communication services payloads. |
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| Special Operation |
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Activity to support maintenance of satellite functions or engineering and science investigation outside of normal, routinely scheduled operations. |
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| Specification |
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A detailed requirements or design document that provides a verification basis for a system or system element. |
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| State |
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Condition of a system with respect to circumstances in the mission. |
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| Stationkeeping |
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On-orbit spacecraft maneuver that corrects for orbital drifts. |
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| Store (v.) |
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Retain and maintain data and information for retrieval. Does not imply permanent archive. |
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| Stored Commands |
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Commands that are stored in the on-board computers RAM that are executed at a specified time. Each stored command contains a either an absolute or relative time tag that indicates when the command will be executed. |
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| Subscription |
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A standing request for data or notification of data availability defined by user-specified criteria, to be delivered on a continuous or conditional basis. |
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| Synthetic Data |
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Any kind of input or output data that is created to represent GOES-R data. Both proxy data and simulated data are types of synthetic data. |
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| System |
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An integrated set of elements, segments, and/or subsystems that accomplish a defined objective.
For the GOES-R Program, the GOES-R System represents the combined Space Segment and Ground Segment capabilities. |
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| System Concept |
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The overall system technical approach, the architecture, and system operations concept developed to satisfy the system requirements document and user concept of operations. |
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| System of Interest |
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The identified part of the system hierarchy, whether a part, assembly, or subsystem, that is assigned to the engineering team. |
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| System Performance and Operations Test (SPOT) |
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Refers to the period, which consists mainly of detailed verification and validation (V&V) of each aspect of flight and ground system performance, through V&V of: spacecraft performance metrics, bus subsystems and the end user products. |
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| Systematic Errors |
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Consistently reproducible inaccuracies in the measured data due to the precision limitations of the measurement and bias. |
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Systems Engineering
Life-Cycle |
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The systems engineering life cycle consists of three major stages: Concept Studies, Program Definition and Risk Reduction (PDRR), and A&O. Disposal of a satellite after its life is considered part of operations. |
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| Systems Engineering Management Plan (SEMP) |
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An implementation plan for the performance of systems engineering functions and the development of systems engineering products. This plan identifies what, when, where, by whom, and how the functions are performed. It specifies the schedule for the development, and the resources required. |
