REG NASA-LLIS-1349-2003 Lessons Learned ADEOS-II L0 Data Gap Introduction Problem.pdf

1、Lessons Learned Entry: 1349Lesson Info:a71 Lesson Number: 1349a71 Lesson Date: 2003-01-01a71 Submitting Organization: GSFCa71 Submitted by: Bonita SeatonSubject: ADEOS-II L0 Data Gap Introduction Problem Description of Driving Event: In early February 2003, JPL and NASDA reported gaps in Level 0 dat

2、a 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% data re

3、covery. 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 reported b

4、y JPL and NASDA.Lesson(s) Learned: Use adequate and appropriate Test Data/Live Data to use in all phases of data processing system verification.Recommendation(s): a. Establish a baseline set of high fidelity test data (live and simulated data) to use for repeated tests with known results at each sit

5、e. Specific to the ADEOS-II NGN efforts, the Tiger Team is preparing a single session live data set from raw data captured at WFF; however, several sessions should be individually recorded to create a larger baseline of live data and copied to both the WFF and ASF locations. Provide project with det

6、ailed characterization of data required.b. Request data sufficiently ahead of launch to allow use in validating ground system operations. If the requested data cannot be provided or cannot be provided in a meaningful timeframe, identify shortcomings in testing and associated risks that will result.c

7、. Confirm that the data simulation parameters have been set to most closely mimic live data and Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-document those parameters for future test needs. Ensure that adequate knowledge is on-hand to modify param

8、eters in response to any likely spacecraft or instrument changes that might occur.d. Obtain sufficient data specifications to enable early, complete data simulatione. Develop and use detailed step-by-step test procedures that include test set-up and expected results. Expected results should include

9、data product expectations. Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): a71 ScienceAdditional Key Phrase(s): a71 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-,-,-