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英国剑桥大学无线电天文学家彼特·杜费特史密斯最近发明了一种游标（CURSOR）系统，使普通大哥大在其软件程序稍加修改后便可用来确定使用者的位置。该定位系统误差小（50米以内），比现在的民用全球定位系统还要精确。定位系统由大哥大、中继站和游标站组成，前二者是现在已?
Peter Astrid Smith, a radio astronomer at the University of Cambridge in the United Kingdom, recently invented a CURSOR system that allows a typical big brother to determine the user’s location after minor modifications to its software program. The positioning system error (less than 50 meters), more accurate than the current civilian GPS. Positioning system by the Big Brother, relay stations and cursor stations, the former two are now?