基于多模型的捷联红外导引头隔离度在线补偿方法

摘要

以捷联红外导引头的工程应用为研究背景，针对刻度尺误差带来的隔离度问题，提出一种基于多模型（multiple model，MM）的隔离度在线补偿方法。建立了捷联红外导引头隔离度模型，分析了隔离度对导弹制导系统稳定性和制导精度的影响；对刻度尺误差进行离散建模，采用基于 MM 的滤波算法，实时更新每个模型与真实值匹配的条件概率，得到刻度尺误差的估计值，最后将当前时刻的刻度尺误差估计值代入到制导回路进行在线补偿。研究结果表明，捷联导引头隔离度的存在会削弱制导系统稳定性、降低制导精度，特别在寄生回路正反馈时影响更为严重；所提出的基于 MM 的隔离度在线补偿方法可较好地实时估计出作用于系统的刻度尺误差，并有效实现了对刻度尺误差引起的隔离度的在线抑制，具有较好的鲁棒性和自适应性，达到了改善制导性能，提高制导精度的目的。%On the background of engineering application in strapdown infrared seeker,an on-line compensa-tion method based on multiple model(MM)is proposed aiming at inhibiting the disturbance rejection rate due to scale error.The disturbance rejection rate model of strapdown infrared seeker is established.The effects on missile guidance system stability and guidance precision due to disturbance rejection rate are analyzed.The MM based algorithm is adopted to update the model probabilities based on a series of possible scale error models,and the real time estimated results of scale error are introduced into the guidance loop to get disturbance rejection rate compensated on-line.The research results indicate that the guidance system stability and guidance precision will be weakened by disturbance rejection rate of strapdown seeker,and the positive feedback of the parasitic loop is most serious.The proposed on-line compensation method can estimate the scale error in real time,the disturbance rejection rate due to scale error is inhibited on-line effectively with good robustness and adaptivity, and the performance and precision of the guidance system are improved after the compensation.