Aiming at ascent trajectory planning of pre-cooled combined power vehicles, in order to ensure the optimal flight performance of pre-cooled combined power engines, the paper conducts a trajectory planning study on a pre-cooled combined power vehicle from the end of take-off to the first and second separation point ascent, considering the flight mission and the pre-cooled combined power engines’ characteristics of different operating modes. A nominal trajectory is planned based on the height-velocity profile, and then the nominal trajectory is simulated and verified by linear feedback control methods.
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