Study Of Strapdown Platform Based On Infrared Seeker

Infrared seeker is one of the key components of homing tactical missiles. It tracks the target quickly and accurately. During terminal guidance, seeker's performance is extremely important for successful target interception. While intercepting, Angle motion and mass sports of the missile couples to the Seeker axis through multiple ways, therefore rate gyro stable platform is commonly used to stable the seeker, which is widely applied right now. But, with growing demand of high precision, miniaturization seeker development, direct application of rate gyro stable technology is limited, therefore a solution of strapdown is proposed, whose inertial components is installed on the base of the seeker instead of the imaging device, so as to stabilize the platform through coordinate changes.This article proposes stabile strapdown platform technology for miniaturization of IR seekers on the basis of digital model of stabile strapdown platform study and simulation. Gyro on missile is used to stabilize the seeker tracking platform, with solution of size restriction of traditional rate gyro stable platform. With simulation and verification, it meets the standard requirements of existing tactical missile models.This article focuses on four topics:1) A mathematical model of IR seekers strapdown type stable platform is established with digital simulation for the theory foundation of the study of strapdown stable platform.2) Two approaches to digitally realize strapdown stabile is studied: angular velocity compensation and angular position compensation. The method and the results are theoretically instructional to actual engineering.3) Feasibility study of the strapdown type axis stable platform is carried out, using the method of matching filter, with improved decoupling precision of the stability platform.4) Kalman filtering methods are adopted to estimate angular rate, considering extracting inertial sight angular rate on strapdown platform with strapdown, instead of relying on self differential properties of the platform controlling system, thus increasing the flexibility of stable system design. This designing method is instructional to proportional guidance by strapdown stable seeker.This article significant to the research of minimizing infrared imaging guidance head, reducing cost, and solving the space on volume tactical missile; meanwhile, it can also be used to solve other stability issues of the platform of movement of the carrier with limited size.