In use, ground-station failures were common, and if a human operator was not available to reactivate the equipment manua卫星地面站经常在运作过程中发生故障，如果不安排操作人员以手动的方式让仪器恢复运作，地面站就可能失去卫星的讯号，连带失去来自该轨道的所有资料。