Design And Implementation Of Main Control Unit Of Navigation Signal Generator

The research of this paper based on navigation signal generator project of navigation and communication laboratory. Main control unit is one of the core modules of navigation signal generator. We have completed state control, external communications, message handling and human computer interaction functions.This paper starts from the design of main control unit of navigation signal generator. We have analyzed the functions of main control unit, and selected DIMM-PC as the core control module of main control unit. Based on the external communication interface of DIMM-PC, we have design and connected the control port and date transfer port of FPGA-XCS30, Ethernet controller CS8900A and transceiver RS232. We also have programmed the port driver and completed the parameter settings and remote control. This paper has researched the HCI mode, and completed concise HCI as keyboard control and LCD display. We have programmed keyboard signal reading and LCD display controlling program, and actual test the HCI function. The main control unit transports messages by the Ethernet and use the CRC checkout check the messages in the transmission to keep the message transport safety.Software control program of DIMM-PC design and implementation based on LINUX Operating System. Control program has implemented the recompiling and update of the kernel of OP, serial login scripting, LCD display, keyboard control, menu control, remote control, parameter settings, and message handling functions. In the programming, we have design reasonable operating procedures, and made the operation conveniently and running smoothly of navigation signal generator.We have test the main control unit of the navigation signal generator by the practical engineering systems, and the results proved that the solution is scientific and rational. The main control unit also has strong scalability of function. The researches and the solutions of the key issues in the design process has good reference for the design and implementation of main control unit of other signal generator.