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针对工程应用中最优落角制导律性能受导引头隔离度影响的问题,基于最优落角制导律(GLTIA)和拓展最优落角制导律(EGLIA),建立了包含捷联导引头隔离度寄生回路的最优落角制导律系统,研究了捷联导引头隔离度对制导系统稳定性的影响,利用伴随函数法,通过仿真对比分析了捷联导引头隔离度对GLTIA和EGLIA制导精度的影响.仿真结果表明:相比正反馈情况,当捷联导引头隔离度寄生回路为负反馈时,最优落角制导律具有较高的稳定域,系统稳定性会随着隔离度幅值的增大而减小.相比于GLTIA,EGLIA的制导性能更优,但导引头隔离度对其制导性能的影响也更为严重,在实际工程应用中,要保证最优落角制导律有较高的制导性能,EGLIA和GLTIA需将导引头隔离度水平分别控制在2.5％和3.5％以下,以降低寄生回路对制导系统稳定性的影响.“,”In order to study the effect of seeker disturbance rejection rate on performance of optimal guidance law,based on guidance law with terminal impact angle (GLTIA) and extended guidance law with terminal impact angle (EGLIA),the regularization of strapdown seeker disturbance rejection rate on the stability of guidance system was studied.Using adjoint method the miss distance of GLTIA and EGLIA were analyzed.The results show that the stable domain of guidance system is larger when strapdown seeker parasitic loop is negative feedback than positive feedback,the stability will reduce when the value of disturbance rejection rate gets bigger.Though EGLIA has more excellent guidance performance than GLTIA,but the influence of a parasitic loop of seeker disturbance rejection rate will be more serious,the sufferable value of seeker disturbance rejection rate for EGLIA is about 2.5％,and the GLTIA is about 3.5％.In the practical application,if the guidance law would work with advanced performance,the value of seeker disturbance rejection rate should be much stricter to reduce the effect of parasitic loop.