Navigation Computer Hardware Based On Dsp Design

This dissertation deals with researches on digital signal processor(DSP) 's application in navigation computer system of SINS. A new method based on the DSP, the MCU and the CPLD is put forward to design the hardware platform of the navigation computer system in this dissertation.Combining the characteristic of the technical development of navigation and the need of the navigation computer system, the author particularly expatiates on the main idea of designing the hardware system of navigation computer. After analysis and model selection, the author designs the overall scheme and hardware circuit. The navigation computer is with a dual CPU structure (DSP and MCU). DSP is used to deal with the data while MCU is to control the I/O operation. The DSP and the MCU are designed on the same circuit diagram to realize the algorithm of integrated navigation system. In this way the two processors can take full advantage of their own characteristic. Furthermore, it is important to design the interface and data exchange scheme between the DSP and the MCU in a dual CPU system. After analysis and discussion, the author puts forward a simple, cheap and wieldy communication scheme. MCU shares DSP's bus and external memorizer to complete the exchange of data with DSP. In order to avoid MCU's I/O operation interfering with DSP, CPLD extends dual bus for MCU. The author designs the communication flow, then carries out under CPLD corresponding development tool and simulates the design of CPLD.The research approves that designing the navigation computer system based on DSP can effectively get the computer precision and speed of SINS higher, minish the cubage, power and cost. It can make the SINS having great value of application, better future of market and great significance of military.