晶振误差对长航时高精度捷联惯性导航系统的影响

The Influence of Clock Error on Long-time High-precision Strapdown Inertial Navigation Systems

针对长航时高精度捷联惯性导航系统中时钟误差对系统导航精度影响问题,从惯性导航系统导航解算算法出发,研究了时钟晶振误差引起系统误差的机理。建立了时钟晶振误差传播特性的数学模型,确定了时钟晶振误差与系统误差的量化关系。对提出的数学模型进行了数字仿真和半实物仿真,实验结果表明,所给出的数学模型是正确的。研究结果对高精度系统设计具有重要的指导意义。

Aims at the influence of clock error on system navigation accuracy in long-time high-precision strapdown inertial navigation systems, starting from the navigation algorithm of inertial navigation system, the mechanism of system error caused by clock crystal error is studied, and the mathematical model of the influence of clock crystal error on system is deduced. A quantitative relationship between clock crystal error and system error is established. The numerical simulation and semi-physical simulation were carried out on the proposed mathematical model. The experimental results show that the mathematical model presented is correct. The results have important guiding significance for high-precision system design.