Loading...
Please wait, while we are loading the content...
A multiprocessor airborne lidar data system
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wright, Cherylyn W. Bailey, Stephen A. Heath, G. E. Piazza, Charles R. |
| Copyright Year | 1988 |
| Abstract | A new multiprocessor data acquisition system has been developed for the existing Airborne Oceanographic Lidar (AOL). This implementation simultaneously utilizes five single board 68010 microcomputers, the UNIX system V operating system, and the real-time executive VRTX. Remote sensing data are collected via CAMAC, GPIB, RS-232, and specialized data sources. The original data acquisition system was implemented on a Hewlett Packard HP 21-MX 16 bit minicomputer using a multi-tasking real-time operating system and a mixture of assembly and Fortran languages. The constant evolutionary state of the AOL places substantial demands on the real-time data acquisition hardware and software, as well as the post flight data analysis software. As new data sources were added, the original data acquisition software eventually required rewriting in assembly language. The present collection of data sources produce data at widely varied rates and require varied amounts of burdensome real-time processing and formatting. It was decided in 1985 to replace the aging HP 21-MX minicomputer with a multiprocessor system. Each data source or group of related and compatible data sources would be connected to a single dedicated microcomputer. To simplify the programming task, the IrCtt programming language was chosen to replace assembler completely. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19890018816.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
