  In this paper, two cooperative guidance laws based on the area around the
target of multiattackers are designed to deal with the problem of cooperative
encirclement or simultaneous attack in the case of known target acceleration
and unknown target acceleration. Multi-attacker communication network only
needs to contain a directed spanning tree, and does not require all attackers
to observe the target information, where at least one can observe the target.
The components along the attacker-target line of sight in the novel guidance
laws can reduce the relative remaining distance between the attacker and the
target at the same speed, thus completing simultaneous attack and avoiding the
calculation of the remaining time. The components of the guidance laws
perpendicular to the attacker-target line of sight can make the normal overload
of relative motion zero, so that the trajectory will not be distorted and the
collision problem within the attacker group can be avoided. The simulation
results verify the practicability of the novel guidance laws.
