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航空学报  2013 

导引头隔离度寄生回路对最优制导律性能的影响

DOI: 10.7527/S1000-6893.2013.0359, PP. 2658-2667

Keywords: 最优制导律,导引头,目标机动,剩余飞行时间,隔离度,寄生回路

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Abstract:

为分析导引头隔离度寄生回路对最优制导律性能的影响,针对空战中目标机动主模式,应用极小值原理推导了一种贴近工程的最优制导律。根据弹上可量测信息提出了该制导律的工程应用策略,包括目标机动估计方法、剩余飞行时间估计方法、导弹和目标机动动力学时间常数装订方法等。在典型雷达平台导引头下建立了隔离度寄生回路模型,分析了隔离度传递函数的特性,研究了制导参数对寄生回路稳定性能的影响。在典型随机扰动输入下,分别在最优制导律和比例导引律制导下利用无量纲伴随方法对比分析了隔离度寄生回路对制导脱靶量的影响。仿真结果表明最优制导律对隔离度寄生回路的影响更加敏感,即使估计信息准确,只有当隔离度小于2%时,最优制导律的脱靶量才小于比例导引律,而当估计信息存在偏差时,只有隔离度更小时,最优制导律的性能才会优于比例导引律;想要应用最优制导律改进导弹的制导性能,相比于比例导引律,必须严格控制导引头隔离度的指标以抑制隔离度寄生回路的影响。

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