有限视场下的攻击时间和角度多约束制导律

Multi-Constraint Guidance Law for Impact Time and Angle with Limited Field-of-View

  • 摘要: 针对精确打击任务存在导引头视场受限这一过程约束的制导问题,提出了一种考虑视场限制以及攻击角度和时间多种约束的制导律.首先,在以比例导引项实现精确命中的基础上,利用最优控制理论,采用弹目距离加权控制能耗形式的指标函数,设计了攻击角度控制项,并推导了相应的剩余飞行时间解析预测表达式. 其次,基于最优误差动力学方法,设计了攻击时间相关的控制项,保证了攻击时间误差的有限时间收敛. 同时,针对导引头视场有限的问题,分析了各控制项对前置角收敛性的影响,利用特定的限制函数确保前置角在整个制导过程中始终处于有效视场内,并给出了前置角的有界性及收敛性证明. 数学仿真结果验证了所提出制导律对多约束制导问题的有效性.

     

    Abstract: To solve the guidance problem of precision strike mission with the process constraint of seeker’s field-of-view (FOV) limits, a guidance law considering FOV limits and multiple constraints of impact angle and time was proposed. Firstly, based on the proportional navigation (PN) term to achieve accurate hit, utilizing the optimal control theory and the index function in the form of missile-target distance weighted control energy consumption, the impact angle control term was designed, and the corresponding analytical prediction formula of time-to-go was derived. Next, based on the optimal error dynamics method, an impact time-dependent control term was designed to ensure the finite time convergence of the impact time error. At the same time, regarding the seeker’s FOV limits, the effects of each control term on the convergence of the lead angle were analyzed, a specific restriction function was used to ensure that the lead angle was always in the effective FOV during the whole guidance, and the boundedness and convergence of the lead angle were also proved. Numerical simulation results demonstrate the effectiveness of the proposed guidance law for multi-constraint guidance problems.

     

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