Design Of Strap-Down Attitude And Heading Data Acquisition System Based On Micromachined Inertial Component

Along with the current MEMS technology development,micromachined inertial components appears,its application in the inertial system becomes a research hotspot.The design of a strap-down attitude and heading system based on micromachined inertial components , DSP and FPGA is given in this dissertation.The dissertation first introduced the principle of strap-down attitude and heading system(SAHS),on the basis of analysis of the character of micromachined inertial components,the type selection scheme and the chosen were given,at last the whole system design scheme was proposed.Afterwards the data acquisition circuit was designed according to the selected micromachined inertial components.Finally the navigation computer system was completed based on DSP and FPGA. In the project,DSP worked as the SAHS algorithm resolver,and FPGA was chosen to realize the function of the information acquisition,FIFO buffer and information transmission.DSP communicated with FPGA via the EMIF Bus of DSP. This design scheme enables DSP concentrating the task of SAHS algorithm resolver,so that ,the speed and efficiency of the syetem has been improved greatly.At last,the software design was presented, including drive program of the various module.The ADC sampling controller ,FIFO buffer, the interface program between FPGA and Digital Temperature Sensor,FPGA and Digital magnetometers were realized using VHDL on FPGA.Moreover,the time simulation was carried out to verify the function of above modules. In the system design,the VHDL were designed by up-down,hierarchical and blocking method.Hardware realized by FPGA is convient and can be easily upgraded because VHDL design can be resued and FPGA is programmable. SAHS based Micromachined inertial component, DSP and FPGA has the characteristics of small dimension, high precision, low cost and power.