GPS/SINS超紧组合导航的性能分析

GPS接收机在高动态环境下很容易失锁，特别是载体的高动态造成的应力对接收机载波跟踪环影响很大。为了解决高动态环境下的组合导航，分析了GPS接收机载波跟踪环的测量误差和跟踪门限，采用惯导速度辅助GPS接收机跟踪环路的超紧组合结构。超紧组合需要涉及到GPS接收机跟踪环内部编排及高动态环境下的实验数据，难度较大。针对超紧组合仿真专门开发了GPS实时软件接收机、高动态GPS中频信号仿真器和惯导模拟器并构建了一个完整的GPS/SINS超紧组合仿真系统。仿真结果表明，该超紧组合导航系统可以跟踪50g的加速度和10倍音速。

Performance Analysis of GPS/SINS Ultra-tight Coupled Navigation

GPS receiver in high dynamic environment is easy to lose the lock, especially the stresses caused by high dynamic object can influence the receiver tracking loop significantly. In order to resolve the combination navigation under high dynamic environment, the measurement error and tracking threshold of GPS receiver tracking loop and the ultra-tight structure used the velocity derived form INS to aid the GPS tracking loop is analyzed. Because the ultra-tight coupled navigation need change the GPS receiver tracking loop and test under high dynamic environment., a real-time software GPS receiver and high dynamic GPS IF signal simulator and INS simulator have been developed to build the GPS/SINS ultra-tight coupled navigation system. The simulation results show that the navigation system can track 50g of acceleration and 10 times the speed of sound.