International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, Nevada / To model the "black boxes" in a command and telemetry simulation, it is important to
preserve the abstraction of a one-to-one match between the real-world interfaces and the
simulated interfaces. Everywhere a physical interface exists on the box, there needs to be
a simulated interface. Preserving this abstraction allows the model to evolve more
naturally with real-world design changes. In most command and telemetry systems, many
different types of commands and telemetry can be sent over a single interface. This
creates a problem in preserving the interface abstraction if the Ada language is used for
implementation. Due to the fact that Ada is a "strongly typed" language, a different or
overloaded operation needs to exist for each type of command or telemetry. However,
by using a "discriminated variant record" to represent the commands and telemetry
streams, a single operation can be used in the Ada specification. This not only preserves
the abstraction but makes the software more maintainable by allowing the data list to
change during the design of the "black box" without changing the Ada specification. As
a result, "loose coupling" is achieved, a common set of commands and telemetry formats
can be "inherited" to promote reuse, and overall system development and maintenance
costs are reduced.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/608844 |
| Date | 10 1900 |
| Creators | Policella, Joseph, White, Joey, Shillington, Keith |
| Contributors | CAE-Link Corporation, Fastrak Training Inc. |
| Publisher | International Foundation for Telemetering |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | text, Proceedings |
| Rights | Copyright © International Foundation for Telemetering |
| Relation | http://www.telemetry.org/ |
Page generated in 0.002 seconds