To solve the problem of multiple missiles attacking a maneuvering target,a fixed-time cooperative guidance law with attack time constraints is proposed.Firstly,the geometric model describing the relative motion between the missiles and the target in the longitudinal plane is established.The relationship between the missiles radial acceleration in line-of-sight direction and time-to-go is analyzed.The fixed-time cooperative guidance law is designed based on first-order system consistency.Secondly,the targets maneuver is seen as the bounded external disturbance,and a fixed-time convergence observer is used to estimate it.The estimated value is applied to the design of the cooperative guidance law to reduce the chattering phenomenon caused by the upper bound of the disturbance.Finally,the effectiveness of the fixed-time cooperative guidance law is verified by numerical simulation.