Planning Technology Of Asteroid Multiple-impulsive Rendezvous Trajectory Based On Improved Genetic Algorithm

Asteroid Exploration missions are complex,risky and costly.Therefore,it is worthwhile to study the design of a transfer orbit that can save fuel and reduce transfer time for asteroid missions.Based on the above background and significance,this paper studies the problem of trajectory planning based on the form of impulsive thrust.Using genetic algorithm as the solution of trajectory optimization problem,this paper studies the multi-pulse trajectory optimization problem with asteroid as the goal.An efficient algorithm based on improved genetic algorithm to solve the trajectory planning problem of asteroid intersection.The main contents are as follows:Firstly,a multi-pulse trajectory planning model based on Lambert algorithm is established.Which can be used as a basis for the follow-up planning of trajectory planning of asteroid pulses under different constraints.Secondly,an improved multi-population genetic algorithm is proposed to solve the optimization problem of asteroid intersection planning.By making multiple subpopulations evolved in parallel,the crossover and mutation probability of the subpopulation can enrich the diversity of the population and reduce the possibility that the optimization result will fall into the local optimal solution according to the change of the population fitness.Then,for the problem of slow convergence speed and weak local search ability,the greedy algorithm and improved multi-population genetic algorithm are used to compose the hybrid genetic algorithm.The greedy algorithm is used to update the progeny of the genetic algorithm,and then the new population is optimized.It maintains the quality of the solution and improves the iterative efficiency.Finally,MATLAB simulation is used to realize the simulation of multi-pulse intersection trajectory planning of asteroid.When we solve the planning problem,We will take the intersection mode,the initial parameters,different optimization algorithms into consideration.The problem of multi-pulse intersection of asteroid with fixed transfer time and free transfer time is studied.And the simulation results are compared and analyzed.