REG NASA-LLIS-1352-2003 Lessons Learned ADEOS-II NGN L0 Data Gap Introduction Problem.pdf

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1、Lessons Learned Entry: 1352Lesson Info:a71 Lesson Number: 1352a71 Lesson Date: 2003-07-15a71 Submitting Organization: GSFCa71 Submitted by: Bonita SeatonSubject: ADEOS-II NGN L0 Data Gap Introduction Problem Description of Driving Event: In early February 2003, JPL and NASDA reported gaps in Level 0

2、 data products received from the Wallops and Alaska ADEOS-II Data Processing Systems. Gaps in the SeaWinds product were characterized by JPL to be intermittent in nature, of variable size, and located at irregular intervals in the data products. Reprocessing of the raw data by NASDA yielded 100% dat

3、a recovery. Thus, while there was 100% data capture, data gaps were introduced by the DS resulting in approximately 8% data loss in the Level 0 product (i.e. 8 out of every 100 minutes of data was not included in the Level 0 product). These gaps were undetected at the processing station until report

4、ed by JPL and NASDA.Lesson(s) Learned: Include adequate and useable Data Accounting capability, reports, and tools during requirements definition and system development.Recommendation(s): Tiger Team experience has shown that data accounting is often streamlined or eliminated from system requirements

5、 as a result of schedule and budget pressures. While it is not known whether the early ADEOS-II requirements were reduced in the same way, the result is the same: Customer feedback is required to identify issues with data product quality. The requirements and operations concept should identify how d

6、ata accounting will be performed, both procedurally and automatically, and system capabilities built to meet those requirements and concepts. There were no data analysis tools available to perform data analysis. The Tiger Team requested EDOS support personnel to generate utilities that were used for

7、 analysis of raw and processes ADEOS-II data. Evidence of Recurrence Control Effectiveness: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/ADocuments Related to Lesson: N/AMission Directorate(s): a71 ScienceAdditional Key Phrase(s): a71 Ground Equ

8、ipmenta71 Ground Operationsa71 Information Technology/Systemsa71 Test & VerificationAdditional Info: Approval Info: a71 Approval Date: 2003-07-29a71 Approval Name: Al Galloa71 Approval Organization: GSFCa71 Approval Phone Number: 301-286-3756Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-