In this paper, a mission planning logic to solve the problems in urgent condition is introduced. There are some constraints considered for the urgent condition. First, there is only one ground station. Next, the urgent period is defined as the period from the end time of first communication (contact) between satellite and a ground station after the current time to end time of second contact. Last, the new mission should be planned before first contact. Since the telecommand for new mission has to be uploaded during first contact. The mission planning logic before uploading the scenario and the post-processing after uploading the scenario are described in the paper. The urgent condition is to plan a new mission that conflicts with already uploaded mission in urgent period. The conflict between the missions means that the operation time of mission doesnt overlap each other. At this time, the uploaded planning has to be canceled to register the new mission planning. Therefore, mission planning system (MPS) assumes that it is normal to cancel the uploaded planning when the new mission planning is generated. Also, MPS saves the information of canceled missions since it can be restored as the failure of cancellation command. And then, ground station system requests telecommands to cancel and upload the mission planning to the satellite. The post-processing algorithm of the scenario uploading, which depends on the result of the scenario uploading, is designed to handle the anomaly condition as the failure of the scenario uploading partly or all.
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