Conceptual Approach for Precise Relative Positioning with Miniaturized GPS Loggers and Experimental Results
TECHNICAL UNIV OF MUNICH (GERMANY)
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L1 phase measurements collected by a miniaturized and low cost GPS logging device are the basis for a navigation approach aiming to precisely measure flight trajectories independently from any auxiliary system. Forming single differences between two measurements taken by one moving receiver at two different times allows achieving relative precision in the low decimeter range over time intervals of up to several minutes. Neither space nor ground based augmentation systems, a second, nearby base receiver or any static initialization patterns are required by the method. This fact significantly reduces the complexity to be handled by the user often operating under adverse field conditions even at extremely remote locations. The approach is taking advantage of canceling ambiguities instead of striving for estimating these unknown quantities every phase measurement is biased with. The constitutive navigation equations are derived and theoretic aspects of various error sources restricting possible processing intervals are discussed in this paper. The method is validated by both static and dynamic reference data. Finally first results from a GPS campaign at Kerguelen Archipelago to measure the dynamic soaring of Albatrosses using the time-difference method are presented and exemplary data are processed using the time-difference method.
- Operations Research
- Navigation and Guidance