A guidance problem for impact time and angle control applicable to cooperative attack is considered based on the sliding mode\ncontrol. In order to satisfy the impact angle constraint, a line-of-sight rate polynomial function is introduced with four tuning\nparameters. And the time-to-go derivative with respect to a downrange orientation is derived to minimize the impact time error.\nThen the slidingmode control surface with impact time and angle constraints is constructed using nonlinear engagement dynamics\nto provide an accurate solution. The proposed guidance law is easily extended to a nonmaneuvering target using the predicted\ninterception point. Numerical simulations are performed to verify the effectiveness of the proposed guidance law for different\nengagement scenarios.
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