REG NASA-LLIS-0425-1996 Lessons Learned Voyager Impact of Real-Time Commanding on Flight Operations (~1977).pdf

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1、Lessons Learned Entry: 0425Lesson Info:a71 Lesson Number: 0425a71 Lesson Date: 1996-07-10a71 Submitting Organization: JPLa71 Submitted by: J.A. RobertsSubject: Voyager Impact of Real-Time Commanding on Flight Operations (1977) Abstract: Though necessary to support mission objectives, the Voyager Gro

2、und Data System and Mission Operations System design accommodated very limited real-time commanding. Correcting this required difficult modifications, and the real-time command generation capability still had limitations. Several recommendations are offered to assure that real-time commanding requir

3、ements receive careful consideration early in mission design.Description of Driving Event: (Relevant Historical Lesson(s) Learned)The Voyager spacecraft system, Ground Data System (GDS) and Mission Operations System (MOS) were designed to accommodate very limited real-time commanding. Early flight e

4、xperience revealed that frequent real-time commanding was necessary to support mission objectives. The required modification to the GDS and MOS was difficult and these systems still retain limiting characteristics which make real-time command generation more difficult and costly than is desirable.Le

5、sson(s) Learned: Careful determination of real-time commanding requirements must be made early in mission design.Recommendation(s): 1. The spacecraft design should consider the ease of commandability of those subsystems most likely to require real-time commanding.2. Ground Software must be designed

6、to readily accommodate the generation of the necessary Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-real-time commands and to minimize the time and effort required to update the software initial conditions resulting from real-time command activity

7、.3. MOS procedures must accommodate real-time commanding in a way which meets established timeliness criteria and is compatible with acceptable levels of risk.4. The resulting capabilities and limitations must be widely communicated to all Project interests.Evidence of Recurrence Control Effectivene

8、ss: N/ADocuments Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Flight Equipmenta71 Flight Operationsa71 Ground Equipmenta71 SpacecraftAdditional Info: Approval Info: a71 Approval Date: 1995-10-16a71 Approval Name: Carol Dumaina71 Approval Organization: JPLa71 Approval Phone Number: 818-354-8242Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-