一种长航时惯导定位误差评估的新方法

针对长航时惯导传统定位误差评估中存在的问题,提出了一种新的基于惯导误差传播函数拟合的定位误差评价新方法。基于长航时惯导系统定位误差传播模型的特点,采用三角函数建立了误差传播拟合函数,主要包含舒拉周期、地球周期和傅科周期,反映了惯导的长期误差特性。提出了惯导误差契合度的定义和计算方法,实现了对长航时惯导系统定位误差的量化评估。对两套精度大致相同的长航时惯导舰载实验数据进行了对比分析,结果表明新的评估方法能够给出更合理的定位性能优劣判断。最后,针对长航时自主导航需求提出了综合导航技术的改进建议。

A new method to evaluate the positioning error of long-endurance navigation

Aiming at the problems in the traditional positioning error evaluation of long-endurance navigation, a new positioning error evaluation method based on inertial navigation error propagation function fitting is proposed. Based on the characteristics of the positioning error propagation model of the long-endurance navigation system, the error propagation fitting function is established by using the trigonometric function, which mainly includes the Earth period and the Foucault period, reflecting the long-term error characteristics of the inertial navigation. The definition and calculation method of inertial navigation error agreement degree are put forward, which realizes the quantitative evaluation of inertial navigation system positioning error for long-endurance. A comparative analysis of two sets of long-endurance inertial navigation ship-borne experimental data with roughly the same accuracy has been carried out. The results show that the new evaluation method can give a more reasonable judgment of the pros and cons of positioning performance. Finally, some improvement suggestions for integrated navigation technology are proposed for the requirement of long-endurance autonomous navigation.