说明：  matlab读取GPS时间信息，UTC代码
( GPS2UTC Convert GPS time tags to UTC(GMT) time accounting for leap seconds GPS2UTC(date) corrects an array of GPS dates(in any matlab format) for leap seconds and returns an array of UTC datenums where: UTC = GPS- steptime Currently step times are through Jan 1 2009, but need to be added below as they are instuted. All input dates must be later than the start of GPS time on Jan 6 1980 00:00:00)