基于定点DSP的航姿数据采集与处理系统

摘要

A kind of navigation position data acquisition and processing system was designed to implement the navigation data-s fast acqusition and real-time processing in AHRS. The analog signals came out of the MEMS accelerometers, gyroscopes and the magnetometer were sent to the AD converter. The converted data were processed by the fixed-point DSP. The dominant frequency of the ADSP - BF506F can reach 400 MHz, the floating point arithmetic can be simulated on fixed-point DSP. It can improve the data processing precision without affecting the real-time capability. This paper introduced the hardware ciucuit design of the system and the principle of the floating-point calculation on fixed-point DSP. This solution has many advantage such as low cost, strong antijamming capability and small power. It can implement data acqusition and processing effectively and the test effect is good. It can also provide convenience for the late work of attitude solving.%为实现航姿参考系统(AHRS)中航姿数据的快速采集和实时处理,设计一种基于定点DSP的航姿数据采集与处理系统.由微电子机械系统(MEMS)加速度传感器和陀螺仪以及三轴磁强计采集到的航姿数据通过高速模数转换器(ADC)转换成数字信号送入定点DSP进行处理,利用ADSP-BF506F的主频可达400 MHz的优势,用软件实现定点DSP模拟浮点运算,在保证实时性的前提下提高数据处理的精度.文中详细介绍了数据采集系统的硬件电路设计以及定点DSP模拟浮点运算的原理和试验方法.该系统方案成本低、抗干扰性强、功耗小,能够有效进行数据采集与处理工作,试验调试取得了良好的效果,为后期的姿态解算工作提供了便利.