REG NASA-LLIS-1354--2003 Lessons Learned ADEOS-II NGN L0 Data Gap Introduction Problem.pdf

1、Lessons Learned Entry: 1354Lesson Info:a71 Lesson Number: 1354a71 Lesson Date: 2003-07-16a71 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: Provide a test/migration suiteRecommendation(s): Recognize the continuing need for and establish a test/migration bed for ground system development efforts. This test/migration bed should be able to perform or simulate the same functions as the operational syst

5、em and should have the same configuration in terms of platform versions, operating systems, configuration parameters, etc. This will provide a place for on-going troubleshooting, revision testing with reduced impact to on-going operations. Alternatively, if the system is developed with a cold or hot

6、 back-up system and if allowed by the system requirements, the back-up system could be used as a test/migration bed. This will create periods where a back-up is not available, but will provide a “safe“ place for problem isolation, testing, and possibly, data analysis. If the back-up system is to be

7、used as a test bed, develop detailed procedures and policies on test/migration use to safeguard the operational system. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AM

8、ission Directorate(s): a71 ScienceAdditional Key Phrase(s): a71 Configuration Managementa71 Ground Equipmenta71 Ground Operationsa71 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-,-,-