Design method of fast convergence Kalman filter for estimating missile and target line-of-sight rate

Abstract

The invention relates to a design method of a fast convergence Kalman filter for estimating the missile and target line-of-sight rate, and belongs to the technical field of missile guidance control. The method is provided to improve the convergence speed of present target-missile line-of-sight rate estimating Kalman filtering methods. The method comprises the following steps: setting an initial filter estimate; measuring and calculating the relative distance and the relative rate between a target and a missile at present; measuring and calculating the components of the acceleration of the missile in o' y4 and o' z4 axis directions of a line-of-sight coordinate system; constructing a pitching channel fast-convergence by suing a missile pitching channel line-of-sight motion state equation and a pitching channel line-of-sight angle measurement equation, constructing a yaw channel fast-convergence Kalman filter by using a missile yaw channel line-of-sight motion state equation and a yaw channel line-of-sight angle measurement equation, and respectively finding the line-of-sight pitch angle rate and the line-of-sight yam angle rate between the target and the missile. The method improves the convergence speed of the Kalman filter to obtain high-precision line-of-sight rate estimation.

Description

technical field [0001] The invention relates to a precise guidance method for missiles, which belongs to the technical field of missile guidance control, and in particular relates to a method for accurately estimating large target-missile relative motion information. Background technique [0002] In recent years, in order to reduce its cost and improve its reliability, more and more small strapdown or semi-strapdown seekers are used in precision guided weapons. The characteristic of this seeker is that it can measure the distance between the target and the missile. Relative to the line-of-sight angle, if it is an active seeker, it can also measure the distance information, but the strapdown or semi-strapdown seeker cannot directly output the line-of-sight angular rate information required by the actual guidance law. [0003] For the application background of missiles equipped with strapdown seekers, the target-missile relative kinematics and dynamics equations in polar coord...

AI Technical Summary

Problems solved by technology

[0002] In recent years, in order to reduce its cost and improve its reliability, more and more small strapdown or semi-strapdown seekers are used in precision guided weapons. The characteristic of this seeker is that it can measure the distance between the target and the missile. Relative to the line-of-sight angle, if it is an active seeker, it can also measure the distance information, but the strapdown or semi-strapdown seeker cannot directly output the line-of-sight angular rate information required by the actual guidance law

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