TRW Space Systems
Technical Project Lead
Implemented the first flight-approved microprocessor-based subsystem for DSP-series satellites. Designed hardware and software for microprocessor-based spacecraft subsystems. Defined system architectures and implementations for project proposals. Designed system and detailed hardware (Schottky & CMOS) for a real-time flight unit from initial proposal through engineering model test. Hired as part of the TRW fellowship program. Completed Four Proposals for Spacecraft HW & SW.
Major Project: Mission Data Message (MDM)
From Proposal to Engineering Model Test
- Real Time Communications Control System
Software System Design
- Architectural approach
- Software sizing (Final SW @ spec!)
- System Timing
Hardware Design
- System Design for four of five boards
- Detailed Design/ Debug/ Documentation for three boards (250 IC’s)
- Provided guidance for design of fourth board
- Approx four jumpers/ board on Eng’g model (none on processor board - 4hr/IC avg)
Designed for Testability
- One to one mapping between breadboard and Engineering Model (adapter shown above)
- Each board designed to perform well defined functions
- Integration plan provided for HW/ SW stubs to be systematically removed as boards were completed.
Hardware Design Highlights
- CMOS/ I2L/ LS/ S/ SOS
- Programmable wait states
- First TRW 9989 flown
Software Design Highlights
- Interrupt driven system
- Approx 2k lines total code
- Coded to be time independent: permitted testing from DC -> full speed