Abstract: A kind of chemicalelectric hybrid mode propulsion system was proposed for the orbit transfer mission of GEO satellite. This propulsion system has a good application prospect and can fit much of the engineering demands,such as high-degree payloads and high-accuracy orbit insertion.The research on the optimization methods of the transfer orbit based on the hybrid mode propulsion system was carried out. A new Gauss pseudospectral method to solve the multi phase optimum control problem was proposed,which transformed the multiple nonlinear programming problems transformed by Gauss pseudospectral method to one by setting up the linkage of the breaking points. Two simulation examples indicate that this method can effectively solve the optimization problem of the multi-phase non-smooth orbit. It has the advantages of high operation efficiency, big convergence radius and high solving accuracy, and can conveniently and fast process the optimization design of the transfer orbit based on the hybrid mode propulsion system.

Key words: electricpropulsion, hybrid mode, multi phase, geosynchronous orbit, Gauss pseudospectral method