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在末制导过程中,为了取得较高的命中精度,制导律必须使视线(LOS)角速率较快收敛。为了提高制导律的性能,在假设未知不确定时变项有界的前提下,对带有双闭环滤波器的变结构制导律进行了研究。提出的变结构制导律能够使视线角速率及其一阶导数在有限时间内收敛至滑动模态域内,得到更加精确的等效控制并有效克服干扰的影响。通过引入高阶滑动模态,对有关定理进行了重新证明,简化了证明过程,加强了定理的结论,弱化了定理成立的条件。最后利用数值仿真验证了所研究方法的有效性。
During final guidance, the guidance law must converge the line of sight (LOS) angular velocity faster in order to achieve higher hitting accuracy. In order to improve the performance of the guidance law, the variable structure guidance law with double closed-loop filter is studied under the premise of assuming the unknown variables are bounded. The proposed variable structure guidance law can make the angular rate of the line of sight and its first derivative converge into the sliding mode domain within a limited time, and obtain more accurate equivalent control and effectively overcome the influence of interference. By introducing higher-order sliding modes, the relevant theorems are re-proved, which simplifies the proof process, strengthens the conclusion of the theorem and weakens the conditions for the establishment of the theorem. Finally, numerical simulation is used to verify the validity of the proposed method.