Field-of-View and Input Constrained Impact Time Guidance Against Stationary Targets

TL;DR

This paper introduces a guidance strategy for intercepting stationary targets that accounts for field-of-view and actuator constraints, using Lyapunov stability and backstepping to improve impact time control.

Contribution

It presents a novel guidance method incorporating FOV and actuator constraints into impact time control using Lyapunov and backstepping techniques.

Findings

Effective impact time control demonstrated in simulations.

Guidance strategy handles actuator saturation and FOV constraints.

Multi-stage approach extends impact time range.

Abstract

This paper proposes a guidance strategy to achieve time-constrained interception of stationary targets, taking into account both the bounded field-of-view (FOV) of seeker-equipped interceptors and the actuator's physical constraints. Actuator saturation presents a significant challenge in real-world systems, often resulting in degraded performance. However, since these limitations are typically known in advance, incorporating them into the guidance design can enhance overall performance. To address the FOV constraint, a time-to-go error-based approach is adopted. Furthermore, to incorporate the lateral acceleration constraints, the engagement kinematics are augmented with an input saturation model. Subsequently, the guidance strategy that constrains the lateral acceleration and the time-to-go values within their respective bounds is derived using Lyapunov stability concepts and the backstepping technique. Furthermore, a multi-stage approach is suggested to expand the achievable range of impact time. Numerical simulations are performed to validate the efficacy of the proposed scheme for different initial engagement geometries.