快速传递对准中机翼弹性变形估计方法比较

Comparison of wing distortion estimation methods in transfer alignment

传递对准是机载主惯导对子惯导进行初始化的过程,机翼变形对快速传递对准滤波精度有显著影响。讨论了传递对准中机翼变形的不同估计方法,通过分析建模过程比较了各种方法的特点及其适用范围。然后建立快速传递对准仿真环境,用"速度加姿态"匹配方式进行仿真,比较了不同方法所能达到的精度。最终从对准精度、快速性、模型依赖度、计算量等方面,对各种传递对准中机翼弹性变形的处理方法进行了比较总结,结果表明,将弹性变形当作有色噪声且使用卡尔曼滤波量测扩增法进行传递对准滤波器设计时,在估计精度和计算量方面达到最好折衷。所得结论为快速传递对准弹性变形的处理提供了工程应用参考。

Transfer alignment is the initialization process of slave INS utilizing data from airborne main INS. The wing deformation can greatly degrade the rapid transfer alignment accuracy. This paper discusses the different estimation methods of wing deformation in transfer alignment, and compares the characters and scopes of the methods by analyzing the modeling process. Then a simulation environment is founded, and based on which, the mathematical simulation of ＂velocity plus attitude＂ matching transfer alignment using various deformation estimation method is carried out to evaluate their performance. Finally, the conclusion of different treatment ways of wing deformation in transfer alignment is made in such areas as accuracy, rapidity, level of relying on the accurate modeling, and amount of calculation. The results show that the best compromise between alignment accuracy against amount of calculation is reached by taking the deformation as coloured noise and using measurement-augmented kalman filter. The results provide a reference for practical applications in rapid transfer alignment.