汎地球測位システム(GPS)の残留測位誤差解析

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The operation of reducing the accuracy called Selective Availability artificially is performed to GPS which U.S.A is operating since 1993.DGPS is developed to oppose SA, in which differential corrections should be computed at the reference station and is transmitted to user receivers by radio or other means and applied at the remote receiver. There are two major DGPS services in Japan,one is operated by JCG(MW DGPS),and the other is operated by GPex(FM DGPS).SA has been canceled in May 2000,and the multipath error becomes serious problem because it cannot be compensated by using DGPS. As the existence of multipath is not actualized,several efforts to avoid the influence of multipath, such as selection of positioning point,use of a directional antenna and use of high elevation satellites,are performed. We are observing the positioning error using noncommercial GPS receivers since 1998. From February 2002,we have started continuous position observations at four fixed points.The positioning error obtained by the GPS stand alone,the improvement by DGPS,and the influence of the multipath etc.are investingated.The positioning error decreases about 75% by using DGPS. And the GPS satellites are thrown into the 12 hour orbit,the positioning error because of multipath shows the periodicity of about one day. The most up-to-date GPS receiver has employed eight,and more channels All-in-View system. Some satellites are hidden with a building for example in many cases. It is shown that it may become the data which judge the propriety of receiver installation place selection.
宇部工業高等専門学校の論文

汎地球測位システム(GPS)の残留測位誤差解析

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