Accuracy Evaluation of Real-Time GNSS Survey Observations Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/js956k298

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  • Real time networks (RTNs) have become popular for Global Navigation Satellite System (GNSS) surveys because highly accurate positions can be derived in seconds to minutes compared to hours as required with static sessions. To evaluate the accuracy of these shorter-duration, RTN GNSS observations and their potential for use as a source for establishing geodetic control, data collected from two National Geodetic Survey (NGS) surveys in South Carolina and Oregon were studied in detail. This case study explores the horizontal and vertical accuracy of real-time observations as a function of observation duration, examines the influence of the inclusion of Globalnaya Navigazionnaya Sputnikovaya Sistema (GLONASS) observables, compares results from real-time kinematic (RTK) positioning using a single base station versus a network of base stations, and assesses the effect of baseline length on accuracy. Thirty-eight passive marks were repeatedly observed with GNSS using a RTN in the two study areas for a variety of different observation time durations, ranging from 5 seconds to 15 minutes. An optimal real-time observation duration was found in the range of 180 to 300 seconds. The real-time data acquired using a network of base stations tended to be more accurate and precise than single-base RTK data. Further, the addition of GLONASS observables helped obtain more fixed solutions at longer baseline lengths than solutions based solely on GPS observables as well as showed a very slight improvement in accuracy, particularly for stations with poorer satellite visibility.
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