Command and Host Processor Profile
The primary role of the CH node in this application is to connect payloads to the host vehicle and to serve as the system controller for payload operations. These functions are implemented through software services running on the radiation-hardened microprocessor.
A radiation-hardened FPGA is present to implement protocols needed for communication with the host vehicle that are not directly supported by the microprocessor. If any custom electronics are necessary, they may be connected to the expansion slot using the Expansion Profile. In these cases, the FPGA serves as a communications bridge between the host vehicle and the available interfaces on the microprocessor.
This CH profile instantiation serves as the system controller and is responsible for monitoring state-of-health of the JAS system, controlling overall system state, and performing configuration on reconfigurable elements (primarily network routers and FPGA-based nodes).
At least two copies of this CH application may be required within each JAS system to interface to the host vehicle and provide system controller services. One CH node serves as the active node while the other remains powered down as a redundant spare. Due to the unique connectivity of this node and the critical functions it implements, one-to-one redundancy is recommended when this node is functioning in this role.