REG NASA-LLIS-1592-2005 Lessons Learned Pointing System.pdf

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1、Lessons Learned Entry: 1592Lesson Info:a71 Lesson Number: 1592a71 Lesson Date: 2005-02-10a71 Submitting Organization: LARCa71 Submitted by: Kimberly Graupnera71 Authored by: John StoughtonSubject: Pointing System Abstract: Pointing system requirements, need to be agreed upon up front. Description of

2、 Driving Event: The Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS) Project was supposed to use on-board processing to autonomously determine where to point the instrument. This capability proved costly and was later de-scoped to one of recovering the pointing knowledge using ground pr

3、ocessing. But with the loss of on-board attitude pointing knowledge, GIFTS could not meet the latency requirement for generating the Navys imaging product. Thus, the team went through another round of requirements iteration to resolve issues, inter-agency goals and objectives, and to properly alloca

4、te new and/or modified requirements to the subsystems. The de-scope and the requirements iterations had impacts on the instrument design, often causing the team to change course and throw away work. Lesson(s) Learned: Understand the data requirements of interested parties. Understand the recovery pr

5、ocesses required to produce the products. Agree up front which portions of the data recovery and product generation are allocated to the Space Segment and to the Ground Segment. Recommendation(s): At the instrument level, verification was planned to be done by analyses. The test chamber being Provid

6、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-used limited the scope of pointing tests that could be performed. Reliance was being placed on bench tests at the sub-assembly level for pointing system components. These results and the pointing characterist

7、ics from sub-system tests were going to be used in a pointing simulation to validate the pointing requirements. Keep the funding and do not change the requirements. Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): a71 ScienceAdditional Key Phrase(s): a71 External RelationsAdditional Info: Approval Info: a71 Approval Date: 2007-09-07a71 Approval Name: ghendersona71 Approval Organization: HQProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-