Abstract: A guidance law with multiple constraints (GLMC) is derived in light of the effect of disturbance rejection rate of seeker on the stability and guidance accuracy of the multi-constraint guidance system, and a multi-constraint guidance model is established, in which the disturbance rejection rate of seeker is considered. The effect of disturbance rejection rate and guidance parameters on the stability of guidance system is analyzed. In addition, the adjoint function is employed to analyze the guidance performance variations of the multi-constraint guidance law with or without the influence of disturbance rejection rate of seeker. The results indicate that any decrease in guidance time constant or flight remaining time as well as increase in the disturbance rejection rate will lead to a decrease in the stability of guidance system. The GLMC can sustain a disturbance rejection rate of about 1%. In the practical applications, it is essential to control the level of disturbance rejection rate of seeker strictly and reduce the effect of parasitical loop on the stability of guidance system so that a superior guidance performance of the multi-constraint guidance law can be ensured.

Key words: ordnance science and technology, guidance law with multiple constraints, guidance stability, parasitic loop, disturbance rejection rate of seeker