To deal with the limitation of real-time scheduling algorithm of space based optical sensor network

the object characteristics was deeply analyzed

and a sensor pre-assignment model was proposed.Furthermore

the real-time modification was introduced

and the dynamic sensor pre-assignment algorithms based on modified particle swarm optimization and segmented pre-assignment were proposed

under the condition of different demand couple

i.e.tight couple and loose couple.Simulations conducted under the condition of tight couple and loose couple show that

the dynamic sensor pre-assignment algorithm needs long-time pre-assignment process

but the computation efficiency of real-time modification exceeds that of real-time scheduling algorithm

which can leave more margin time for the upper system.