为分析平台导引头隔离度寄生回路稳定性的影响因素,对隔离度及寄生回路建模。通过Routh判据研究了导引参数与滤波器参数对寄生回路稳定性的影响。结合某毫米波平台导引头实例,用频域法分析了典型条件下隔离度寄生回路特性,结合伯德图对3种常用制导滤波器特性及其对寄生回路稳定性影响进行了说明。研究表明:隔离度寄生回路的稳定性在中频段最差,导引参数、隔离度特性及滤波器差异均对隔离度寄生回路的稳定性有重要影响。

In order to analyze the stability of platform seeker’s parasitical loop of disturbance rejection rate.Both models of disturbance rejection rate and parasitical loop were established.Based on these models, the effects of guidance parameter and filter parameter on the stability zone of the parasitical loop were studied with Routh criteria.With a millimeter wave platform seeker, the characteristic of parasitical loop of disturbance rejection rate was analyzed by using frequency domain methods under typical flight conditions.Combined with Bode diagram, the characteristics of three commonly used guidance filters and their effects on the stability of parasitical loop were explained.The results show that the parasitic loop may go unstable in the middle frequency mostly.Guidance parameters, amplitude-phase characteristic of the disturbance rejection rate, and filter variations all affect the stability of parasitic loop significantly.