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Virtual machine language
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | O'Reilly, Taifun Lock, Patricia Fteichert, Ralph Page Sr., Dennis Sisino, John Lin, Imin Naviaux, Keith Grasso, Christopher |
| Copyright Year | 2005 |
| Description | Virtual Machine Language (VML) is a mission-independent, reusable software system for programming for spacecraft operations. Features of VML include a rich set of data types, named functions, parameters, IF and WHILE control structures, polymorphism, and on-the-fly creation of spacecraft commands from calculated values. Spacecraft functions can be abstracted into named blocks that reside in files aboard the spacecraft. These named blocks accept parameters and execute in a repeatable fashion. The sizes of uplink products are minimized by the ability to call blocks that implement most of the command steps. This block approach also enables some autonomous operations aboard the spacecraft, such as aerobraking, telemetry conditional monitoring, and anomaly response, without developing autonomous flight software. Operators on the ground write blocks and command sequences in a concise, high-level, human-readable programming language (also called VML ). A compiler translates the human-readable blocks and command sequences into binary files (the operations products). The flight portion of VML interprets the uplinked binary files. The ground subsystem of VML also includes an interactive sequence- execution tool hosted on workstations, which runs sequences at several thousand times real-time speed, affords debugging, and generates reports. This tool enables iterative development of blocks and sequences within times of the order of seconds. |
| File Size | 174783 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110016376 |
| Archival Resource Key | ark:/13960/t3b04455j |
| Language | English |
| Publisher Date | 2005-11-01 |
| Access Restriction | Open |
| Subject Keyword | Man/system Technology And Life Support Virtual Reality Uplinking Iteration Applications Programs Computers Autonomy Telemetry Aerobraking Computer Systems Programs Machine Oriented Languages Programming Languages Compilers Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
