光纤陀螺寻北仪数据采集单元的设计与实现

Design and implementation of data acquisition instrument based on FPGA for FOG north finder

针对捷联惯性光纤陀螺寻北仪中惯性器件动态测量范围宽及系统对实时性、可靠性和精度要求高的特点,设计了基于FPGA的高速、多通道、可扩展数据采集单元,实现多传感器数据实时采集。同时,由于用FPGA集成了寻北仪系统主要的I/O操作,从而使系统CPU能更专注于方位角解算算法,保证了寻北的快速性,并为执行更复杂的算法提供了有利条件。本文给出了系统软硬件设计方案,实验及实际应用表明,该数据采集单元工作稳定,实时性好,达到了设计指标。

In view of the requirements in strapdown inertial FOG North Finder, such as dynamic measurement range, real time,reliability and precision This paper designs a data acquisition instrument based on FPGA to carry out real time data acquisition of multi-sensor. The data acquisition instrument features high speed, mu[ticenter and extensibIe. In addition,the system microprocessor can be absorbed in the algorithm owing to FPGA performs most I/O functions in North Finder. This provides advantage for implementing more complex algorithms and ensures speed of north-finding. The paper offers scheme of program and circuit design. Experiments and apphcation show that the data acquisition instrument works in real time and steadily with anticipative pre-set requirements.