基于DSP和FPGA的导航系统硬件平台设计

导航计算机是捷联惯性导航系统中的核心部件,主要完成初始对准和导航计算,通常由高性能、高精度的计算芯片构成.基于DSP和FPGA技术,设计应用于导航系统的导航计算机,通过时序控制和程序设计,解决了DSP芯片的自举引导、芯片之间通信、脉冲信号计数和导航计算等问题.通过长航时导航实验测量,电路能够长时间稳定工作,测量的陀螺计数误差小于e-10,导航实验速度误差小于±0.5 m/s,最大的导航径向误差0.490 8 nm,在24 h内的导航精度达到0.5 nm.平台能够提供精确快速的测量和计算数据,为惯性导航系统发挥重要作用.

Design of hardware platform for navigation system by using DSP and FPGA

The navigation computer is designed for initial alignment and navigation computing in strap-down inertial navigation system (SINS).It is the key part of system,and it is made up of chips with high performance and accuracy.By using DSP and FPGA technology,the circuit of navigation computer is designed.Through sequence control and program design,the problems of DSP boot-loading,communication,pulse signal counting and navigation computing are solved.According to long-time experimental test,the result shows that the computing error is less than e10 and speed error is less than±0.5 m/s.The maximum radial error is 0.490 8 nm.And the navigation accuracy is 0.5 nm in 24 hours.The circuit suits the demand of real-time and accuracy for navigation computing.Therefore it is important to navigation system.