Spacecrafts planned for the years 1995-2000 are envisaged to contain a generic PAM (Propulsion Avionics Module) A part of the PAM has the task to process data form a large number of embedded sensors to perform control, diagnostics and health monitoring. These tasks include the following.
--Control, for the real-time closed loop control of the craft during the mission.
--Diagnostics, for fault isolation and corrective action initiation during the mission.
--Health Monitoring, to assess after a mission, if the craft will fly again? What refurbishing is needed?
To carry out the above tasks the PAM and the associated sensors should provide an integrated environment to perform three generic computational activities, namely, numeric manipulations for general data processing and data base management, symbolic manipulations for diagnostics and decision making, graphic presentation as an interface with operators in manned missions. Furthermore, the communication among the processors and the sensors should be EMI and hostile environment resistant. We have implemented a FO-LAN based testbed as an integrated environment of numerical, symbolic and graphic processors with ports for sensors and actuators. A multimode, 832 nm carrier wavelength, passive star network connects a Microvax, LMI LAMBDA (with PICON) and Silicon Graphics IRIS workstation. There are four additional ports for connecting sensors and actuators. With this testbed, we can evaluate various architectures can also carry out hardware in the loop simulations for studying control strategies. Details of the testbed and preliminary results of intelligence sensor analysis will be presented.