Multiple model based on-line compensation for disturbance rejection rate of strapdown infrared seeker

On the background of engineering application in strapdown infrared seeker, an on-line compensation 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.