10 Hz or 10 s? |
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| Authors: | Torben Schüler |
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| Institution: | (1) Institute of Geodesy and Navigation, University of the Federal Armed Forces Munich, Neubiberg, Germany |
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| Abstract: | Data sampling frequencies in many kinematic GNSS applications are often in the range of 2–10 Hz or even higher. In contrast,
the sampling frequency of standard reference stations is usually not higher than 1 Hz, and many stations even deliver data
at sampling intervals as large as 30 s. An easily implemented algorithm for data interpolation will be presented and it will
be demonstrated that interpolation of pseudorange and carrier phase reference station data is possible at a high level of
accuracy. This technique—which has not received proper attention so far—is helpful to reduce data storage capacity for postprocessing
applications, but and can also be beneficial for real-time applications suffering from slow data links. Results of test trials
indicate that a standard deviation better than 2 mm can be reached for interpolated carrier phases collected at reference
sites sampling data with 5-s intervals in double difference mode. These interpolated double difference data obviously still
follow a Gaussian distribution. A trend function for the expected standard deviation of interpolated double difference carrier
phase measurements will be presented. From this function, a recommendation for an optimal sampling rate of reference station
data can be derived which is close to 10 s. |
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| Keywords: | GNSS positioning Data interpolation High-frequency applications |
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