Ground Systems
ITOS, the Integrated Test and Operations System, is a suite of software for control of spacecraft and spacecraft components during development, test, and on-orbit operations.
It is a low-cost, portable, highly configurable system that runs
under a variety of UNIX operating systems, including
SolarisTM,
FreeBSD, and
Linux
on workstation or PC hardware.
ITOS currently is supporting more than a dozen missions including:
SAMPEX,
TRACE,
FAST,
SWAS,
WIRE,
Triana,
Spartan
251,
Spartan
401,
Spartan
402,
SWIFT,
HESSI,
and
ULDB. ITOS is being used for all phases of mission life from board and box level development through spacecraft integration and test and on-orbit operations.
System Features
- Remote telemetry and events via web browser
- Database-driven telemetry decom and command creation
- Runs on UNIX PC or workstation
- Real-time and off-line data analysis tools including X-Y plots, raw telemetry dumps, and tabular data capture
- Time-tagged ground and spacecraft event logging
Data Rates
- Telemetry ingest rates verified through 4 Mb/s
- Ability to process, monitor, and display housekeeping verified through 128 kb/s
- Command transmission verified through 4 kb/s
Automation Features
- Powerful STOL program interpreter
- Configuration monitor can act based on complex logical expressions
- Remote control of IEEE-488, RS232, and networked instrumentation
Telemetry Features
- CCSDS or TDM telemetry and command formats
- Reed-Solomon decoding, CRC error checking, and CCSDS derandomization in software
- Red and yellow limit checking
- Polynomial and discrete data conversions
- Frame and packet archiving and playback
- Derived telemetry points
- Distribution of telemetry data to subsystem and instrument GSEs in real time over IP network
Command Features
- CCSDS COP-1 S/C command verification
- Command and table load generation and editing
- Spacecraft load, dump, and compare
- Produces frames, packets, or CLTUs
