基于DSP/FPGA的光纤捷联航姿系统设计

为适应现在航空设备向小型化、低功耗方向发展,设计了一种基于DSP+FPGA的高速、多通道的捷联航姿系统;主要描述了系统的硬件电路设计,采用FPGA完成各传感器的数据采集及控制;采用了高性能的浮点型DSP为内核,用于航姿解算数据高速处理;将FPGA映射到DSP EMIF的一段地址上进行数据交互;FPGA设计采用VHDL语言描述,DSP程序采用了C语言程序和汇编程序编制,设计可重构性强,升级容易,移植性好;跑车试验证明系统高速可行,俯仰角和横滚角误差在0.05°以内,航向角误差为小于0.5°,精度达到了设计的要求。

Design of FOG Strap-Down Attitude and Heading Reference System Apparatus Based on DSP and FPGA

With the miniaturization and low power development of the aviation equipment.A high speed,multi-channel Strap-Down Attitude and Heading Reference System based on DSP+FPGA is designed.The system’s hardware circuit which uses FPGA as mainly external sensors data acquisition I/O and control interface,and a high performance Floating-Point DSP as core which processes the data,is introduced.FPGA is mapped into DSP memory space to complete the data communication with each other.The FPGA design is described by VHDL and the DSP programs are designed by C and assemble language.This system is easy to redesign,upgrade and replant.High speed and feasibility of this system are proved by practice.The error of the pitch and roll is below of 0.05°,and the error of the heading is below of 0.5°.The precision of this system is up to the design criterion.