Abstract
This paper presents an integrated guidance and control (IGC) law for the strapdown homing missile with consideration of the field-of-view (FOV) constraint and actuator saturation. Given that the commonly-required guidance information, such as the inertial line-of-sight (LOS) angle and/or its angular rate, cannot be measured by the strapdown seeker, a detailed IGC model considering the gravity and time-varying missile velocity is first derived based on the only measurable information, the body-LOS (BLOS) angle. Then a novel IGC controller is designed for this model by means of the integral-type Barrier Lyapunov Function (iBLF) based dynamic surface control technique. This IGC controller following the pure tracking principle is capable of forcing the BLOS angle to track the negative angle of attack while satisfying the FOV constraint and actuator saturation in an integrated manner, thereby guaranteeing a precise attack on a stationary ground target. The stability of closed-loop system and the boundedness of constrained BLOS angle are both proved strictly, and the performance of proposed IGC controller is thoroughly testified by method comparisons and Monte-Carlo analysis.
Highlights
In order to meet the increasing demand for precision attacks on lightly armored point targets while avoiding unnecessary collateral damage as much as possible, the cost-effective, lightweight miniature missile equipped with a strapdown seeker attracts more attention in recent years
It is reported in the literature that two integrated guidance and control (IGC) schemes are designed based on the singular perturbation theory [21] and receding horizon control [22], respectively. Another IGC model with consideration of the FOV constraint is proposed in [23], which directly takes the BLOS angle as a constrained system state. Noting that this IGC model has a strict feedback structure, the Barrier Lyapunov Function (BLF) based dynamic surface control enhanced with extended state observer [23], disturbance observer [24], and neural network disturbance observer [19], are employed to design IGC laws for the strapdown homing missile
Even in the presence of severe parametric uncertainties, it can be observed from Fig. 8(d)-(h) that under the proposed IGC law, the BLOS angle is still capable of tracking the negative angle of attack and confined with the given FOV of the strapdown seeker, ensuring that the inertial
Summary
In order to meet the increasing demand for precision attacks on lightly armored point targets while avoiding unnecessary collateral damage as much as possible, the cost-effective, lightweight miniature missile equipped with a strapdown seeker attracts more attention in recent years. Another IGC model with consideration of the FOV constraint is proposed in [23], which directly takes the BLOS angle as a constrained system state Noting that this IGC model has a strict feedback structure, the Barrier Lyapunov Function (BLF) based dynamic surface control enhanced with extended state observer [23], disturbance observer [24], and neural network disturbance observer [19], are employed to design IGC laws for the strapdown homing missile. It is worth noting that aforementioned IGC laws, as well as most preexisting guidance laws focusing on the FOV constraint, do not consider how to obtain the inertial LOS angle and/or its angular rate for the strapdown homing missile, they all require this essential guidance information to compute the final control command. More advanced control method can be applied to the IGC model (18) without considering the target observability
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