Digital Signal Processing System Of Strapdown Inertial Navigation

Taking a practical engineering project as reference, the paper completes the hardware and software design for FOG strapdown inertial navigation system based on DSP. The paper introduces FOG, and then simply analyses the basic principle and the mathematics model of strapdown inertial navigation. The paper majors in the hardware and software design of digital signal processing sections of strapdown inertial navigation. It can be divided into 3 parts.Firstly, based on high performance of processor DSP--TMS320C32, the hardware is designed for the mainboard to systematically collect and process digital signal. It includes 1)external memory system; 2) the logical interface circuit of FPGA; 3) the interface circuit of accelerators and FOG; 4) smart RS422 UART; 5) Three-Wire RTD temperature measurement circuit and A/D convert circuit; 6) Boot loader circuit; 7) interface of MPSD.Secondly, on the basis of mainboard hardware, the Boot loader table employed in the loading program is introduced as well as the mix program method with assemble language and C language.Lastly, it introduces the characteristic and design flow of FPGA; explains the program method for VHDL; gives some practical skills and examples of this system's logical design; and discusses the details of smart RS422 UART module.The system utilizes one FPGA chip for main logical design, RS422 UART for communication interface, and Three-Wire RTD temperature measurement circuit. Remarkable innovation is shown here.I designed the schematic and PCB of the system, writed some driver and logic module of FPGA, debugged all the founctions of the circuit board. The system works stably to achieve the function of strapdown inertial navigation. It has laid some contribution for a more minimized system and the practical produce.