Abstract
In Russia, GLONASS is being developed as a positioning system which is the same as GPS. Recently, a receiver
with combined GPS and GLONASS appeared, and good positioning is expected. GPS and GLONASS were used at
the same time, and the positioning accuracy was analyzed by the kinematic method. The positioning by this method
can be handled easily in the same way as other methods, and fix high position accuracy. Therefore, it is suitable
for fish bank research which needs high position accuracy beyond the present differential method. However, it is
necessary to consider the base line length the further from the reference station it is, since the position error
becomes larger.
As a result of the analysis, it was grasped quantitatively how much the positioning accuracy to the base line
length deteriorates by the kinematic method when GLONASS was used in common. That is, the positioning accuracy
of using GLONASS in common became about 3/4 that of only GPS. Besides, even though the positioning.accuracy
deteriorated as the user station moves away from the reference station, it was found that it was possible to get
higher accurate position by the time zone when GLONASS was used in common.
