The GNSS analysis device in which suppressed the reduced accuracy of positioning results due to multipath, etc. provide. GNSS analyzer 26 includes a GNSS receiver 44 and radio receiver 45, a base line analyzer 43, a pattern generating section 41, a data corrector 42,. GNSS receiver 44 and the radio receiver unit 45 acquires the reference stations observation data and measurement station observation data obtained based on the radio waves from the GNSS satellites. Baseline analyzer 43, on the basis of these observations, obtains the baseline vector of the measurement station as the positioning result. Pattern generating unit 41, as components of synchronization is emphasized in the set period of time (about one day), to create a data change patterns of these observations. Data correction unit 42 obtains the noise variation pattern by removing the DC component from the data change pattern, and by subtracting the noise change pattern from the target data, removes noise included in the target data.
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