| Daily Operations |
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Recurring, nominal operations over a 24 hour period. |
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| Data (Ground Segment) |
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Numerical or other information represented in a form suitable for processing by computer. |
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| Data Provenance |
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The process of tracing and recording the origins of data and its movement between databases. It contains the derivation history of data, beginning with its original sources. It includes elements such as who (person) or what (process) created the data, where it came from, how it was transformed, the assumptions made in generating it, and the processes used to modify it. |
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| Depth of Discharge (DOD) |
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DOD is defined as the percentage of capacity discharged divided by the rated capacity. Therefore, a 60% DOD would be achieved by discharging 60 Ah from a battery with a rated capacity of 100 Ah. |
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| Derating |
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The reduction of the applied load (or rating) of a device to improve reliability or to permit operation at high ambient temperatures. |
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| Design Life |
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The minimum period of time during which the spacecraft must be capable of performing all mission operational requirements. |
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| Design Qualification Tests |
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Tests intended to demonstrate that a test item will function within performance specifications under simulated conditions more severe than those expected from ground handling, installation, launch, ascent, and orbital operations. Their purpose is to uncover deficiencies in design and method of manufacture. They are not intended to exceed design safety margins or to introduce unrealistic modes of failure. The design qualification tests may be to either “prototype” or “protoflight” test levels. |
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| Designated Representative |
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An individual (such as a plant representative), firm (such as assessment contractor), or other government representative identified and authorized by the government to perform a specific function for the government. As related to the contractor's effort this may include evaluation, assessment, design review, participation, and review/approval of certain documents or actions. |
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| Destructive Physical Analysis (DPA) |
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An internal destructive examination of a finished part or device to assess design, workmanship, assembly, and any other processing associated with fabrication of the part. |
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| Deviation |
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A known departure from requirements prior to any manufacturing or development taking place. Requires government approval. |
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| Diagnostic Product |
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Any product that is output from the Level 1 processing of instrument data received from diagnostic data-producing instrument modes. |
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| Directive |
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A policy, procedure and guideline, or instruction that has been approved and published by the appropriate authority. GPR 1410.1 addresses four types of directives, each of which serves a specific purpose. |
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| Directive, Ground |
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An instruction to a component of a ground system, which is operator-defined and may be initiated in response to operator input or defined event criteria. |
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| Discrepancy |
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See Nonconformance. |
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| Disposal, satellite |
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The final phase of a satellite mission. At the end of its operational life, GOES satellites are raised 300 kilometers above synchronous altitude to allow another satellite to use the vacated orbital slot. |
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