天线罩和导引头隔离度对制导系统影响研究

Effect of radome and seeker disturbance rejection rate parasitic loop on guidance system

针对相控阵雷达导引头的隔离度寄生回路问题,分析了天线罩和导引头隔离度产生的原因,建立了考虑天线罩和导引头隔离度的制导系统动力学模型,基于线性时不变系统稳定性判据和无量纲化法研究了天线罩和导引头隔离度共同作用对制导系统稳定工作域的影响。利用无量纲伴随函数法研究了天线罩误差斜率和导引头隔离度不同叠加情况对脱靶量收敛的影响。研究表明,单一研究天线罩或导引头隔离度所得结论对导弹制导系统设计缺乏实际指导意义,制导系统稳定工作区域受到天线罩和导引头隔离度共同作用的影响,二者的叠加情况不同,对制导系统的稳定工作区域和脱靶量收敛的影响不同。正反馈叠加将严重影响脱靶量收敛和制导系统稳定性,应尽量避免。

Aimming at the problem of the disturbance rej ection rate parasitic loop of the strapdown phased array radar seeker in practical engineering applications,the causes of the radome and seeker disturbance rejection rate parasit-ic loop are analyzed,the guidance system model which considers the disturbance rejection rate parasitic of the radome and the seeker is established,the effect of the radome and seeker disturbance rejection rate parasitic loop on the gui-dance system stability region is studied.Based on the dimensionless adjoint function method,the effect of superposition of the radome and seeker disturbance rejection rate parasitic loop on the convergence of miss distance is studied.Re-searches show that singly studing the disturbance rejection rate parasitic loop of the radome or the seeker is of less prac-tical engineering significance for the design of the missile guidance system,the staility region of the proportion naviga-tion guidance system is affected by the coactions of the radome and seeker disturbance rejection parasitic loop,the gui-dance system stability region and miss distance are affected by different superposition cases.Miss distance and guidance system stability are seriously affected by positive feedback superposition,which should be avoided.