Abstract: A hybrid coding differential evolution algorithm (HCDE) is proposed to satisfy the revisit period requirements of agile imaging constellation observation targets. Firstly, the working characteristics of the agile imaging satellite are analyzed, the objective function for evaluating the satisfaction of the revisit period requirements is constructed, and the imaging task constraint satisfaction model is established. Then, based on the optimization requirements for the execution, sequence, and imaging time of observation tasks, a binary real hybrid encoding differential evolution algorithm is proposed to optimize the distribution of imaging tasks on the time axis. Finally, the simulation results show that compared with the genetic algorithm based on binary coding, this algorithm has significant advantages in convergence speed and optimization effect.

Key words: agile imaging satellite, task planning, revisit period, hybrid coding, differential evolution