捷联惯导系统双位置快速抗干扰对准方法

摘要

The classic two-position parameter identification alignment method of SINS uses horizontal velocity errors as measurements, and needs long time to identify some parameters. Besides, its convergent speed is affected by the initial value of recursive calculation. In this paper, an improved two-position alignment method is put forward which directly uses the horizontal specific forces in unit time as measurements. This method neglects the high-level items which are formed by errors. It changes cubic equation to linear model to estimate, which improves the speed of convergence. The tests by the two-position alignment method indicate that the new alignment method has many advantages such as simple arithmetic, small computational amount, quick alignment speed, strong anti-interference ability, high alignment precision, and it is not affected by the initial value of recursive calculation.%经典捷联惯导系统双位置参数辨识精对准采用水平速度作为量测值，对部分参数辨识时间较长，且收敛速度受递推计算初值影响。提出了一种利用单位时间的水平比力作为量测值的双位置快速抗干扰对准方法，并忽略误差构成的高阶项，可以将三次曲线转换为线性模型进行估计，提高了初始对准的收敛速度。双位置对准试验结果表明，双位置快速抗干扰对准方法算法计算量小，算法简单，对准速度快，抗干扰性强，对准精度高且不受递推计算初值的影响，具有较强的工程实用价值。