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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1220
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    • شماره تماس دبیرخانه رویداد: -
     standard network rtk has been widely used since it was proposed in the mid-1990s. rovers can obtain high-precision estimates of position by resolving double-differenced (dd) ambiguities. the focus of this study is a new undifferenced network rtk method, abbreviated as urtk hereafter, based on undifferenced (ud) observation corrections whose single-differenced (sd) ambiguities between satellites can be resolved in several seconds. the tools for studying the real-time realization of the new method are our developments of logical schemes that have the capability for the real-time modeling of a reference network and the instantaneous resolution of sd ionosphere-free (if) ambiguities at a single station. this research demonstrates the validity of modeling regional ud-unmodeled errors on the ground and examines the maximum differences when compared to modeling the errors using ionospheric pierce points (ipp). with data collected at 48 stations from a cors network in shanxi province (sxcors) in china through may 21, 2010, the efficiency of the presented real-time strategies is validated using igs final products in a postprocessing mode. the results verify that more than 83 % of sd wide-lane (wl) ambiguity can be fixed with 5 s of observation data, and the average resolution time of all the wl tests is 4.96 s. more than 80 % of sd l1 ambiguity can be fixed within 5 s, and the average resolution time is only 6.66 s. rovers could gain rapidly centimeter-level absolute positioning service, comparable to standard network rtk. in addition, the urtk method transforms the fixed dd-ambiguities of the reference network into ud-ambiguities, and it does not need to set the base station and base satellite. since the ud-corrections are modeled for each common visible satellite, it breaks down the connections between stations and satellites of the dd-corrections in the current network rtk. the ud-corrections can be broadcast by the base station and automatically selected and optimized by a rover during the real-time kinematic processing, thus avoiding ambiguity in reinitialization due to the change of reference, so it should be very flexible and useful for a wide range of applications.

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