Guidance law against maneuvering targets with intercept angle constraint

Area of Science:

• Aerospace Engineering
• Control Systems Theory
• Robotics

Background:

• Traditional guidance laws often simplify target dynamics, assuming zero acceleration, which limits performance against maneuvering targets.
• Achieving a precise intercept angle is crucial for mission success in guidance applications.
• Singularities in the terminal phase of guidance can degrade control performance.

Purpose of the Study:

• To develop an advanced guidance law capable of handling maneuvering targets with an intercept angle constraint.
• To overcome the limitations of conventional guidance laws that ignore target acceleration.
• To improve tracking accuracy and ensure a precise intercept angle.

Main Methods:

• A linear extended state observer (LESO) was designed to estimate unknown target acceleration.
• A nonsingular terminal sliding mode control (TSMC) scheme was employed for robust guidance.
• The proposed guidance law integrates LESO for acceleration estimation and TSMC for control.

Main Results:

• The linear extended state observer effectively estimated the maneuvering target's acceleration.
• The nonsingular terminal sliding mode control scheme successfully avoided terminal phase singularities.
• Simulations confirmed the proposed guidance law achieves a more accurate intercept angle compared to traditional methods.

Conclusions:

• The developed guidance law significantly enhances guidance performance against maneuvering targets.
• Accurate estimation of target acceleration is vital for achieving precise intercept angles.
• The proposed method offers a robust and effective solution for terminal guidance applications.