A method and system for extracting guidance information for a semi-strapdown infrared seeker

Abstract

The invention discloses a guidance information extracting method and system for a semi-strapdown infrared guiding head. The guidance information extracting method includes the steps that the infraredguiding head image, the infrared guiding head parameter and the infrared guiding head imbalance angle are obtained; the pixel information is determined according to the infrared guiding head image; the target infrared characteristic sizes are determined; the target infrared characteristic sizes includes the target infrared feather length and the target infrared characteristic width; based on the infrared imaging principle, the pixel information, the infrared guiding head parameter and the target infrared characteristic sizes are used for estimating the barrage relative distance, and the barrage relative distance estimated value is obtained; the infrared guiding head imbalance angle and the barrage relative distance estimated value are input into an adaptive unscented Kalman filter model, and guidance information is obtained; and the guidance information includes the barrage approaching speed, the barrage sight angle, the barrage sight angle rate and the target acceleration. By means ofthe guidance information extracting method and system for the semi-strapdown infrared guiding head, the accuracy for extracting guidance information of a missile provided with a semi-strapdown infrared guiding head can be improved, and accurate striking on a target is achieved.

Description

technical field [0001] The invention relates to the technical field of missile filter guidance, in particular to a guidance information extraction method and system for a semi-strapdown infrared seeker. Background technique [0002] With the rapid development of modern military technology, the war mode has gradually been upgraded from the original large-scale firepower suppression to point-target precision strikes. Precision-guided weapons have become an effective means of implementing precision strikes. Homing missiles are an important branch of precision-guided weapons. The seeker can complete the search, identification and tracking functions of the target, accurately provide the guidance information needed by the missile during flight, and then guide the missile to the target. [0003] Because the traditional seeker cannot identify multiple targets well, has poor omnidirectional field of view and weak anti-interference ability, in the field of seeker, the research hotspot...

AI Technical Summary

Problems solved by technology

Although the infrared semi-strapdown seeker has the advantages of miniaturization and low cost, since its direct observation information is only the misalignment angle, the relative distance between projectile and target is not directly observable, so it needs to use filtering technology (such as extended Kalman filtering, etc.) Acquisition of other information required for guidance such as the relative distance between projectile and target

[0004] In the process of using filtering technology to estimate the relative position and orientation of projectiles and targets, there are mainly two types of problems: 1. Since the infrared semi-strapdown seeker target tracking system is essentially a passive tracking system, the observability of the system is weak, resulting in It is difficult to obtain a sufficiently accurate estimation of the missile-target relative pose; 2. During the guidance process of the missile, parameters such as the missile-target distance and the missile-target line of sight angle are always in the process of dynamic changes, resulting in the adaptability of the filtering parameters The requirements are high, and the selection of parameters needs to take into account the characteristics of the guidance system in different states

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