@article{oai:nagasaki-u.repo.nii.ac.jp:00009329,
 author = {合田, 政次 and 久野, 俊行 and 中根, 重勝},
 journal = {長崎大学水産学部研究報告, Bulletin of the Faculty of Fisheries, Nagasaki University},
 month = {Oct},
 note = {In order to lengthen the usable time and evaluate the positioning accuracy of the GPS by means of two satellites, we made a measurement at three fixed stations in Japan with a GPS receiver connected with a high stable oscillator. The usable time became about four hours longer at each station. Positioning accuracy was influenced by the accuracy of navigation messages from each satellite, so that we should not use an inaccurate satellite for positioning. By avoiding an inaccurate satellite, we attained almost the same fix accuracy as the low level positioning with three satellites., 長崎大学水産学部研究報告, v.66, pp.31-36; 1989},
 pages = {31--36},
 title = {GPSの測位精度-5 : 高安定発振器の利用について},
 volume = {66},
 year = {1989}
}