精密なクロックによるGPS垂直測位精度の向上

抄録

GPS (global positioning system) has insufficient capability in its vertical positioning accuracy for aircraft in the approach and landing phases of flight. Then, some augmentation systems including pseudolites are now under study to overcome this issue. The authors are considering of using precise clock to improve GPS vertical positioning accuracy. The simulation results show that the vertical positioning error is strongly correlated to the receiver clock estimation error. If one could know the receiver clock error precisely, the vertical error may be corrected significantly, while the horizontal error not. We explain that the aircraft equipped a precise clock, such as an atomic clock, toghther with GPS could obtain significantly accurate vertical position. Some simulation results would also be shown.