ISS Ground Test Data Acquisition System
No Drowning in Data
In 1997 TechSAT together with our American partner in Los Angeles developed a system to assist in the assemblage of the European nodes of the International Space Station. Our direct client was MacDonnell-Douglas and the final user NASA, primarily at the Kennedy Space Center.
TechSAT delivered three identical test systems used for extensive monitoring and data acquisition of MIL1553 buses as well as several hundred discrete channels and measurement data from GPIB devices.
The most challenging requirement for the system was to capture the complete data of 24 MIL1553 buses for a period of at least 72 hours, including several hundred discrete and a smaller number of GPIB devices. This translated into a sustained data rate of approximately 6 to 7 MB/s, and a total amount of data close to 1.8 TB for a 72 hour run to be archived on long-term storage media.
Dedicated monitoring tools were provided to tap into the data stream and display subsets of the monitored data during a recording session.
Post-processing tools were developed to extract subsets of the archived data that were subsequently analyzed with a COTS data viewer.
- Monitoring and recording of 24 fully loaded MIL1553 buses for 72 hours without any data loss
- Post-processing and filtering of recorded data
- Long-term storage of data
- DoD standards
- ADS-3000 as base I/O access and recording platform
- High-speed tape recorder to store the recorded data; cartridges had to be swapped approx. every 10 minutes during a test run
- Dedicated software for discrete signals and GPIB data
- Customer specific software tools for online monitoring and post-processing recorded data
- On-schedule delivery and thus very early access to system for our final customer: NASA at Kennedy Space Center
- 100% stable and reliable platform; in operation for more than 10 years: first during assembly of the nodes, later for on-ground diagnosis of problems discovered in orbit
- Smooth integration with third-party analysis tools