DSP And FPGA Application In Strapdown Inertial Navigation System

To ensure high performance, a low-cost and compact design about inertial navigationsystem, this paper chose to DSP (TMS320C6722) and FPGA (Spartan-3AN familyXC3S700AN) combined form, as a design solution inertial navigation system.Firstly, the paper made a introduction about inertial navigation system’s researchbackground and overview, while the theory and technology of inertial navigation system to dothe analysis. Then about the requirements analysis and system design to achieve the mainfunction of the system, design the corresponding hardware system design. In this paper, thehardware circuit inertial navigation system was the focus of research. Hardware circuitryprimarily for FPGA and DSP minimum system circuitry, while the design of their associatedperipheral circuits. In addition, I designed the analog signal acquisition circuit and FPGAmodules. FPGA various functional modules include data acquisition and control, buffer FIFO,UART serial port and logic control and decode as well as the entire system. Then study theunderlying software design about inertial navigation system, mainly implementation of DSPsoftware and the DSP interrupts and Bootloader mechanism were analyzed. Finally, in thecontext of the completion of the circuit design, function modules for FPGA’s UART and FIFObe simulated tests to verify the feasibility of the program and each module.This paper studies the inertial navigation system receiver the information about IMUdevice and GPS, and also to communicate with the host computer. Navigation system ismainly controlled by FPGA and configuration of the FIFO buffer cache data and extends thecommunication UART serial interface and peripherals. Meanwhile, The system completed acalibration function of time, through the granting of a host computer, the completion of thesynchronization about system and the second pulse PPS, PPS time zero at the rising edge ofthe second pulse, combined with GPS time information as the starting serial output time, the absolute time of the system is corrected. Verified by experiments done synchronizationfunctions.Inertial navigation system uses a combination of DSP and FPGA design solutions, as thenavigation computer hardware digital platform, designed to meet the system requirements foraccuracy and stability.