A position and time calculator, based on a navigation satellite signal, calculates a position of a navigation satellite and a position and a time where an antenna receives the navigation satellite signal. An upper limit error determiner evaluates an upper limit of error caused in positioning a reception position of the antenna based on an amount obtained by multiplying a difference between the time calculated based on the navigation satellite signal and the time measured by a time measurer by a coefficient determined based on arrangement of navigation satellites, and information on the position on the track stored in a memory. A position determiner corrects the moved distance measured by the speed measurer based on the evaluation of the upper limit of error in positioning, and determines the position of the antenna.
POSITION MEASUREMENT DEVICE AND POSITION MEASUREMENT METHOD
2017-02-02
Patent
Elektronische Ressource
Englisch
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