GPS（Global Positioning System，全地球測位システム）の差分補正を行ったDGPSの測位精度は，基準局とユーザ受信機との基線長に依存している．著者等が長基線のDGPS測位実験を行ったところ，基線長が長くなるにつれて衛星－基準局間と衛星－ユーザ局間の電波伝搬遅延量の差が大きくなり，測位精度・確度共に悪化する．ユーザ局における水平方向の測位分布は，ユーザ局の真の位置に対して基準局から遠ざかるように変位していくことが確認された．そこで，ユーザ局を囲むような複数の長基線基準局を同時に用い，各基準局からの擬似距離補正値に基準局の基線長・方位角に依存する重み付けを適用することで，新たな擬似距離補正値を算出する手法を提案する．短基線の基準局を確保できないような地域でも精度の高い測位を実現することを目的として，シミュレーションを行っている．

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Real-time kinematic GPS (RTK-GPS) is a real-time satellite positioning system. Using RTK-GPS, the horizontal and vertical positions of an object can be determined to within a few centimeters. However, Japan currently lacks the essential infrastructure to support the consistent delivery of data. The authors developed and tested a FKP-method network-based RTK-GPS (FKP-RTK) positioning using the area correction parameter (FKP) via the Internet. We studied FKP-RTK positioning at a fixed point, while varying the position of the GPS reference station located inside the station network area. Both the precision and accuracy of the FKP-RTK positioning were confirmed to be independent of the position of the primary GPS reference station (PRS). Using an Internet line, as compared with a public phone line, comparable results were achieved. The degradation in positioning precision when compared to RTK-GPS positioning (non network-based) is not especially pronounced, and we can see that the results of the network-based RTK-GPS positioning correction results are high.

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