Abstract
A Tobit Kalman filter-based guidance system was proposed for expanding the capture region of missiles with a strapdown semiactive laser seeker. The characteristics of the semiactive laser seeker were analyzed, and the narrow field-of-view laser seeker model was used based on the analysis. A guidance filter was designed to utilize the saturated region of the seeker to overcome limited maneuverability arising from the narrow field-of-view range. A Tobit Kalman filter is adopted, and the prediction stage was modified so that the Tobit Kalman filter can be applied for nonlinear process models. The filter model for estimating the look angle, LOS angle, and LOS rate was formulated. The proposed guidance filter can estimate the state more robustly even if saturated measurements are given. This study showed that widening the available field-of-view range can lead to the expansion of the capture region. The impact angle control composite guidance and impact angle control guidance with bearing-only measurement were used for intercepting the target with the desired impact angle. Numerical simulations were performed to demonstrate the effectiveness of the proposed method in the saturated region of the seeker and show that the proposed method can expand the size of the capture region.
Highlights
R ECENTLY, various missile guidance laws have been studied to achieve advanced operational requirements, such as impact angle and impact time, while successfully intercepting targets
1) Impact Angle Control Guidance with Bearing-Only Measurements In impact angle control guidance with bearing-only measurements (IACGBOM), the guidance command is derived based on the sliding mode technique so that error variables related to the interception condition and impact angle constraint converge to zero
When the value of σc is set to 8◦ or 9◦, the capture region was significantly smaller than when σc is 7◦ for both extended Kalman filter (EKF)/Tobit Kalman filter (TKF)-based guidance filters
Summary
R ECENTLY, various missile guidance laws have been studied to achieve advanced operational requirements, such as impact angle and impact time, while successfully intercepting targets. Making more initial conditions available for the interception is important to enhance the capability of the missile To this end, this study proposed a method to expand the capture region of a missile equipped with a semiactive laser (SAL) seeker performing impact angle control. Research has been conducted on guidance filters that estimate the line-of-sight rate with strapdown seekers [27]- [30] Studies such as [28]- [30] are based on the Kalman filter (KF) but focused on the case in which the target remains in the region where the measurement is not saturated. The method to expand the capture region of a tactical missile in engagement with the terminal impact angle constraint was proposed by designing a guidance filter that can utilize the characteristics of the SAL seeker based on the TKF.
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