About BIRCH M J
About Univ. Central Lancashire, Preston, GBR
About HARGREAVES J K
About Univ. Central Lancashire, Preston, GBR
About BAILEY G J
About Univ. Sheffield, Sheffield, GBR
About Radio Science
About atmospheric plasma
About GPS
About Ionosphere,thermosphere
About Electronic navigation in general
About GPS
About 電子
About 電離層
About 高度