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A kind of navigation computer based on DSP (TMS320C6747) and FPGA was proposed, using TI's newly developed DSP chip TMS320C6747 as computer core. DSP is used primarily for solution of navigation information, the FPGA is mainly used for data acquisition and system-level processing and timing control, and a new DSP and FPGA communication is given. After setting up hardware platform the underlying driver is developed, and complete programming of strapdown inertial navigation system software using the modular design method. In practice, the navigation computer performance stability, well-run with high real-time performance and precision of navigation.