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- W125547712 abstract "Mars Pathfinder is the first of a new class of “better, faster, cheaper” interplanetary spacecraft missions being developed for NASA at Caltech’s Jet Propulsion Laboratory. This spacecraft will be launched during the Mars launch window in December 1996 and will land on Mars in July 1997. The lander carries a small 10kg 6-wheeled robotic Rover that will roam the surface and take samples of soil and rocks. The flight software for Mars Pathfinder has a concurrent object-oriented architecture, using many concepts adapted from the Actor school of thought, as espoused by Carl Hewitt, Gul Agha, and others. The flight computer, a 22 MIP radiation hardened derivative of the PowerPC has 128 megabytes of RAM and uses the VxWorks real-time POSIXish operating system. Subsystems (each of which is an object, and contains and/or controls other objects) executes in one or more threads. Each object is event and message driven. This paper describes the current early development effort, where we are using Tcl and its object oriented extension itcl, combined with tclX, blt, and tk, as the language for inter-object messages, for the monitor and control environment, and for the initial implementation of several flight software responsibilities. As the system develops, the flight software may remain as Tcl, or it may evolve into C. The similarity between Tcl and C makes the translation of objects from Tcl to C reasonably straightforward." @default.
- W125547712 created "2016-06-24" @default.
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- W125547712 date "2007-01-01" @default.
- W125547712 modified "2023-09-25" @default.
- W125547712 title "Tcl and Concurrent Object-Oriented Flight Software: Tcl on Mars" @default.
- W125547712 hasPublicationYear "2007" @default.
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