1、Lessons Learned Entry: 0401Lesson Info:a71 Lesson Number: 0401a71 Lesson Date: 1995-06-08a71 Submitting Organization: JPLa71 Submitted by: B. LarmanSubject: Voyager Enhanced Mission Science Return Abstract: An extended Voyager mission was feasible due to engineering improvements that permitted the u
2、se of redundant hardware to enhance science return.Description of Driving Event: After completion of the Voyager primary mission (Jupiter and Saturn encounters), a follow-on mission to encounter Uranus and Neptune was made possible by the DSN arraying antennas and the project incorporating the follo
3、wing:1. A spacecraft design which enabled the implementation of an image motion compensation capability which made possible extremely long image exposures while minimizing image smear.2. A spacecraft design which enables utilization of redundant hardware, such as the Flight Data System memory, to in
4、crease the sequence software on-board storage capacity. This capability has been developed and tested for potential future use to enhance science return.The specific details of the types of spacecraft system and subsystem designs to accomplish this are described in the paper entitled “Voyager Engine
5、ering Improvements for Uranus Encounter“ by Howard P. Marderness.Lesson(s) Learned: 1. A spacecraft design which enables the implementation of an image motion compensation capability can make possible extremely long image exposures while minimizing image smear.2. Spacecraft system architecture and s
6、ubsystem implementations which allow utilization of Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-redundant elements for operational elements during critical periods of the mission are key to enabling expanded spacecraft mission operations. These r
7、edundant elements can be utilized even though the prime elements remain operational.3. Maintenance of a complete flight software development and validation capability during the mission, to allow utilization of the designed spacecraft software flexibility after launch, will enable significant enhanc
8、ement of science data return.Recommendation(s): 1. Consider that a spacecraft system design which facilitates on-board algorithm modifications to optimize performance, based on detailed analysis and understanding of the measured inflight spacecraft operational characteristics, allows significant pos
9、t-launch mission enhancement.2. Use of spacecraft design which enables utilization of redundant hardware, to increase the sequence software on-board storage capacity, should be considered.3. Projects should allocate sufficient resources to maintain a complete flight software development and validati
10、on capability during long duration missions.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): a71 ScienceAdditional Key Phrase(s): a71 Softwarea71 SpacecraftAdditional Info: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Approval Info: a71 Approval Date: 1986-09-11a71 Approval Name: Carol Dumaina71 Approval Organization: 125-204a71 Approval Phone Number: 818-354-8242Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
