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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Castro, M. Straub, J. |
| Copyright Year | 2015 |
| Description | Author affiliation: Dept. of Comput. Sci., Univ. of North Dakota, Grand Forks, ND, USA (Castro, M.; Straub, J.) |
| Abstract | Schedulers for small spacecraft must satisfy the dual requirement of generating very efficient schedules while concurrently minimizing the resources required to create the schedule. This paper proposes a technique for searching for tasks that can be utilized to fill particular schedule locations. This approach is based on a modular system for storing important variables. This modular system has three important variables: $t_{0},$ $x_{0}$ and $y_{0}.$ The variable y is latitude and x is longitude. Time variable t is an integer and each unit represents a time quantum. They are related to each other by three functions $F_{t},$ $F_{x},$ and $F_{y}.$ These functions are derived from a space time function where $x_{0}$ and $y_{0}$ are the normalized ground trace. These three variables can define a prospective instance of any task on an Earth-orbiting spacecraft. Similarly, this same approach could be used for planetary missions by making the ground trace references in relation to the local body. This approach is based on a 'useful trick' that can be performed with integers that facilitates the encoding of conditional statements using these three variables. This trick helps define the life cycle of a task. This approach can also, if needed, be expanded to allow the incorporation of other variables. This paper considers the limits of using integers in this way. It presents and considers several example problems and demonstrates the efficacy of using this algorithm to generate a solution. |
| Starting Page | 1 |
| Ending Page | 7 |
| File Size | 244297 |
| Page Count | 7 |
| File Format | |
| ISBN | 9781479953790 |
| e-ISBN | 9781479953806 |
| DOI | 10.1109/AERO.2015.7119266 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2015-03-07 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Arrays Problem-solving Biographies Telescopes Maintenance engineering Graph theory Satellites |
| Content Type | Text |
| Resource Type | Article |
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