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在惯性导航系统中,惯性元件的标度因数误差对系统的误差产生了极大的影响。本文介绍了一种利用舒勒回路的特性测定惯性元件标度因数的方法。它可以用于船用惯导系统在系泊或航行过程中更换惯性元件时对其标度因数的测定。不同于以往的测量方法,这里充分利用了舒勒回路的周期特性,采用了频谱分析估算振荡周期的方法。文中讲述了它的基本原理和具体算法,并进行了计算机仿真和工程试验。仿真和试验结果表明:该方法能准确的测量惯性元件的标度因数。
In inertial navigation system, the scale factor error of inertial element has a great impact on the system error. This paper presents a method of determining the scale factor of an inertial element using the Schuler circuit characteristics. It can be used for the determination of scale factor of marine inertial navigation systems when replacing inertial elements during mooring or sailing. Different from the previous measurement methods, it takes full advantage of the cycle characteristics of Schuler circuit and adopts the method of spectrum analysis to estimate the oscillation period. The article describes its basic principles and specific algorithms, and conducted computer simulation and engineering tests. Simulation and experimental results show that this method can accurately measure the scale factor of inertial element.