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- Complexity Metrics for Avionics Software: SoHaR developed
new metrics specifically tailored for assessing the complexity,
reliability, and maintainability of Ada software for real
time avionics software. A software tool implemented in Ada
was developed to parse existing Ada source code and derive
the metrics, and the enhanced predictive capability of these
metrics was established using software and failure reports
from a large existing real time Ada software project.
- Avionics Software Performability Analysis: Under contract
to the Wright Avionics Laboratory SoHaR developed a performability
model for avionics software. The model is intended to aid
in trade-offs between software and computer system performance
and dependability by identifying how each of these attributes
affects the worth of the system perceived by the user.
- Flight Critical Digital Systems: Under contract to the
U.S. Air Force Aeronautical Systems Division (ASD), SoHaR
compiled a handbook of the best available measures to reduce
failure consequences and improve reliability of flight critical
computers in the airframe, payload, and propulsion systems.
- Reliability Test Facility: SoHaR was selected to develop
requirements for a national reliability test facility used
for guidance and navigation systems for missiles and aircraft
at Holloman AFB.
- Validation of Digital Systems in Avionics and Flight Control
Applications: SoHaR was selected by the FAA to provide major
revisions to a handbook for the validation of digital avionics,
flight, and engine control systems.
- Fault Tolerant Software for Avionics and Flight Control
Applications: In a separate contract, SoHaR prepared a tutorial
and written input to a handbook for validation of critical
systems for the Federal Aviation Administration's Technical
Center in Atlantic City, NJ.
- Fault Tolerant Aircraft Electric Power Management: As
a consultant to a major control systems manufacturer, SoHaR
developed fault tolerance provisions for the management
of electric power on aircraft and helicopters. The system
provides for automatic load shedding and current limiting.
- Reliability Analysis of Self-Repairing Flight Control
Systems: SoHaR supported AFWAL/FIGL at Wright Patterson
AFB in evaluating reliability and related attributes of
flight control systems which incorporate the capability
to compensate for failures in actuators, control surfaces,
etc., by reconfiguring the remaining controls or by changes
in gain and current limiting.
- Fault Tolerant Software Development for Digital Aircraft
Control Systems: SoHaR was the subcontractor for fault tolerant
software on two fault tolerant flight control computers
developed under the sponsorship of the NASA Langley Research
Center: the Fault Tolerant Multiprocessor (FTMP) and the
Software Implemented Fault Tolerant system (SIFT).
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