REG NASA-LLIS-1130-1999 Lessons Learned Computer Hardware-Software International Space Station Software Configuration Management.pdf

1、Lessons Learned Entry: 1130Lesson Info:a71 Lesson Number: 1130a71 Lesson Date: 1999-02-01a71 Submitting Organization: HQa71 Submitted by: David M. LengyelSubject: Computer Hardware-Software/International Space Station/Software Configuration Management Description of Driving Event: Lack of Source Cod

2、e for International Partner Elements of Space StationLesson(s) Learned: Configuration management of ISS software does not include the source code for all of the elements being developed by the international partners.Recommendation(s): NASA should strengthen the configuration control for ISS software

3、 to include software (source code as well as binary) and simulations produced by all international partners and vendors.Evidence of Recurrence Control Effectiveness: NASA partially concurs with the recommendation, however, there seems to be some misunderstanding here. The source code for the Russian

4、 Service Module SM software is delivered to the SDIL. Some of the other partners, however do not deliver source code. This is based on their concerns that delivery of source code could compromise their contractors proprietary data. From a configuration management viewpoint controlling the executable

5、, which is what is loaded into the vehicle, is sufficient. The ISS has initiated discussions with all partners to reach agreement on what level of source code visibility is necessary to ensure adequate knowledge by the control centers for on-orbit anomaly resolution.The SM simulation software has be

6、en somewhat dynamic as the SM software has matured during Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-vehicle testing in Moscow. Now that testing is finishing and the SM moves to the launch site, the simulation will stabilize. The flight software

7、 and the simulations are obviously tightly linked and the simulations should typically be updated, as they are currently, in conjunction with the flight software. NASA is working to put in place an encrypted link for electronic transmittals.Documents Related to Lesson: N/AMission Directorate(s): a71

8、 Exploration Systemsa71 Space Operationsa71 Aeronautics ResearchAdditional Key Phrase(s): a71 Aerospace Safety Advisory Panela71 Computersa71 Configuration Managementa71 Softwarea71 SpacecraftAdditional Info: Approval Info: a71 Approval Date: 2002-02-25a71 Approval Name: Bill Loewya71 Approval Organization: HQa71 Approval Phone Number: 202-358-0528Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-