Abstract
An integrated guidance integrated estimation/guidance law is designed for exoatmospheric interceptors equipped with divert thrusters and optical seekers to intercept maneuvering targets. This paper considers an angles-only guidance problem for exoatmospheric maneuvering targets. A bounded differential game-based guidance law is derived against maneuvering targets using zero-effort-miss (ZEM). Estimators based the extended Kalman filter (EKF) and the unscented Kalman filter (UKF) are designed to estimate LOS rates that are contaminated by noise and target maneuver. Furthermore, to improve the observability of the range, an observability enhancement differential game guidance law is derived. The guidance law and the estimator are integrated together in the guidance loop. The proposed integrated estimation/guidance law has been tested in several three-dimensional nonlinear interception scenarios. Numerical simulations on a set of Monte-Carlo simulations prove the validity and superiority of the proposed guidance law in hit-to-kill interception.
Highlights
The problem of exoatmospheric interception has been studied for decades
For NMT, the integrated estimation/guidance law with nonlinear filter and observability enhancement differential game guidance law (OEDGL) is tested in a 200-run Monte-Carlo simulation
We expect that the rotation of the Line-of-sight ZEM (LOS) will enable us to estimate the states from angels-only measurements, and it improve the estimation of the range and the relative velocity, especially for NMT
Summary
The problem of exoatmospheric interception has been studied for decades. Clearly, the interceptor must hit and kill the target at the end of the terminal phase. NDG uses the miss distance at terminal time as its cost function, another problem about time-togo that has been studied by Shaul and Sergey [3, 10, 11] They present an exoatmospheric guidance law based on a bounded differential game and a fourth-order time-to-go calculated while both the interceptor and the target perform the optimal strategies in the game, the guidance commands are not chatting and the directions of the optimal acceleration are constant. This kind of guidance is not suitable for an interceptor equipped with lateral thrust, and a firstpass phenomenon will occur if the initial condition is not perfect.
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