Lockheed Martin Space Operations At the Johnson Space Center

In real-time systems, stringent timing requirements may impose on periodic tasks to be initiated immediately upon the arrivals of their periodic requests or at specific time relative to their periodic requests. One of the reasons for the requirements is to avoid jitter. In this paper, we propose treatments to the jitter problems that may occur on scheduling uniform sampling tasks and introduce a schedulability analysis for a task set consisting of periodic tasks and a group task, which is a collection of data acquisition subtasks, scheduled by a static priority scheduling algorithm