Title: Technologies for Optimized Pass-to-Pass Positioning Performance
Author(s): Janet Neumann, Cameron Ellum, Anastasia Salycheva, Brandon Culling
Published in: Proceedings of the 29th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2016)
September 12 - 16, 2016
Oregon Convention Center
Portland, Oregon
Pages: 3579 - 3587
Cite this article: Neumann, Janet, Ellum, Cameron, Salycheva, Anastasia, Culling, Brandon, "Technologies for Optimized Pass-to-Pass Positioning Performance," Proceedings of the 29th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2016), Portland, Oregon, September 2016, pp. 3579-3587.
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Abstract: High quality continuous carrier phase can be used to estimate vehicle motion at the centimeter level over short periods of time even when the absolute position accuracy is at the meter level. Over longer periods of time, the knowledge of the motion is affected by the absolute position accuracy and the availability and quality of corrections for slowly changing errors. The change in the position error level over that period of time is determined by the accuracy with which the accumulated motion over the interval is known. This paper will describe the high level structure of the different positioning engines in NovAtel receivers and how accurate carrier phase is used to maintain a consistent position error over time, with results shown for different situations and absolute position error levels. Types of measures which can be used to evaluate error consistency will be covered and results from GLIDE, Steadyline and RTK ASSIST algorithms will be presented. Different Steadyline configurations will be described along with examples and a discussion of the handling of position types with a convergence phase. This paper will also describe the major sources of error and the challenges in obtaining good pass to pass performance. It will discuss difficulties in maintaining position error levels in blockage conditions and in conditions with high position biases, such as those caused by large ionospheric error in a single frequency receiver. Results from a bias reduction algorithm which runs with GLIDE will be presented.