摘要
对一种基于微机械惯性器件设计的捷联姿态系统硬件结构进行了介绍。该系统主要由ADXRS150微机械陀螺仪、ADXL202E加速度计、MAX125的14位A/D转换器、8253定时/计数器及TMS320VC5509 DSP组成。说明了微陀螺仪与加速度计的基本性能及使用方法、数据的采集与校正的方法,并对A/D转换的精度及DSP的性能进行了分析。实验证明,MEMS惯性器件虽精度较低,但仍能满足捷联姿态系统的性能要求,MAX125的14位A/D转换器转换速度及TMS320VC5509 DSP处理速度很快,均满足捷联姿态系统的实时性要求。
The hardware structure of a strap-down attitude system designed on the basis of MEMS inertial apparatus is introduced. The system is composed of ADXRS150 MEMS gyros, ADXL202E accelerometers, 14-bit ADC-MAX125, 8253 timer/counter and TMS320VCSS09 DSP. The basic performance and operation of micro gyros and accelerometers, data acquisition and calibration are expounded, the precision of ADC and the performance of DSP are analyzed. The experimental results show that the MEMS inertial apparatus fit the performance requests of strapdown attitude system despite its low precision. Both the converting speed of 14-bit ADC-MAX125 and processing speed of TMS320VCS509 DSP are high enough to meet the requirement of real time performance for the strap-down attitude system.
出处
《自动化仪表》
CAS
2007年第1期15-18,共4页
Process Automation Instrumentation
