为提高捷联惯导间接解析粗对准抗线干扰能力,分析了常用频域数字预滤波算法对线干扰的改善效果和局限性。在此基础上,设计了一种基于时域内多项式回归思想的无时延抗线干扰算法,并同频域数字预滤波算法仿真比较,验证了算法有效性。仿真结果表明:该算法可有效抵抗对准过程中的不同类型线干扰影响,对突变型线干扰的效果更优,算法简单,无时延,可在较短时间内满足进入精对准过程的精度要求。

In order to improve anti-vibration abilities of an indirect analytic alignment algorithm for SINS, common frequency-domain digital filtering methods was analyzed to estimate anti-vibration abilities as well as their limitations. On the basis, an anti-vibration algorithm without time delay was proposed based on polynomial regression in time-domain, and simulations were conducted to validate its effectiveness compared with the frequency-domain digital filtering methods. The result shows that the polynomial regression method can effectively handle different kinds of vibrations, sudden change of vibration with simple algorithm and no time delay. The anti-vibration algorithm can meet the requirement of fine alignment in short time.