Abstract: Based on the overlapped-conic targeting method, a fast design method for lunar satellite and lunar landertransfer trajectories is presented. This method is a pure algebraic algorithm without any numerical integration,which has an advantage of rapidity and high accuracy and is suitable for the preliminary design of earth-moon transfer trajectories. This method can also provide good initial guess value for precise orbital calculation and greatly reducethe time for calculating precise transfer trajectories. According to the effects of earth oblateness on the cislunar transfer trajectory, this paper presents a method of correcting the earth oblateness. The result proves that it can greatlyimprove the accuracy of the method of the rapid design mentioned above.

Key words: cislunar transfer trajectory, trajectory design, overlapped conic targeting me thod, correction of earth oblateness effect