Un-differenced real-time kinematic (URTK) fuzziness rapid fixing method with additional atmosphere information dynamic constraint
A technology of dynamic constraints and fixed methods, applied in the field of global navigation satellite systems, can solve the problems of not effectively considering the position relationship between the user and the selected reference station, the wavelength of the observation value, etc.
Inactive Publication Date: 2016-07-06
WUHAN UNIV
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However, the ambiguity fixation strategy adopted by Li did not effectively use the characteristics of EWL (ExtraWideLane, ultra-wide lane) / WL observations with longer wavelengths, which is convenient for fast and effective ambiguity fixation, and did not effectively take into account the user when adding ionospheric constraints. The positional relationship to the selected reference station, the validity of the atmospheric delay interpolation results in the user's area and its variation with local time
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[0067] A specific embodiment of the present invention is as follows:
[0068] Step 1: Use the regional enhancement information of the reference station in the area where the URTK user is located the previous day or at the current moment to predict the residual error after model refinement.
[0069] In this specific embodiment, the area enhancement information of the four reference stations of the previous day or the current moment is selected for forecasting.
[0070] This step further includes sub-steps:
[0071] Step 1.1: Select one reference station as the detection station, and the other three reference stations will be referred to as reference stations for short.
[0072] Preferably, the detection station should be located in the triangle surrounded by the three reference stations.
[0073] Step 1.2: Calculate the residual atmospheric error scaling factor n at feature point i i .
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The present invention discloses a URTK fuzziness rapid fixing method with additional atmosphere information dynamic constraint. The method comprises the steps of dynamically setting the prior information of the zenith direction tropospheric delay and the observation station satellite direction ionosphere delay at the position of a user by utilizing the position relationship of the user and a reference station, the validity of an atmosphere delay interpolation result at the region of the user and the change of the atmosphere delay along with the local time, taking the residual tropospheric delay and the ionosphere delay as the random walk to-be-evaluated parameters to evaluate, and improving the URTK fuzziness resolution by considering the atmosphere constraint information, such as the space-time change characteristics of a troposphere and an ionosphere. At the URTK fuzziness resolution, and by utilizing the characteristic that the extra wide lane (EWL) /WL observation value wavelength is longer, the fuzziness rapid and effective fixing is convenient, the fuzziness fixing speed of the user can be accelerated effectively.
Description
technical field [0001] The invention belongs to the technical field of Global Navigation Satellite System (Global Navigation Satellite System, GNSS), and in particular relates to a URTK ambiguity fast fixing method with dynamic constraint of atmospheric information. Background technique [0002] The rapid fixation of URTK (Undifferentiated network RTK, undifferentiated network RTK) user ambiguity based on the area enhancement system is a research hotspot and difficulty in current satellite navigation and positioning technology. Scholars such as Ge and Teunissen realized the rapid fixation of ambiguity by refining the carrier phase observation value of URTK users [1-2] . [0003] In order to further improve the ambiguity search efficiency and reliability of URTK users, Zou et al. used the more accurate CA / P1 pseudorange observations after model refinement to obtain a more credible initial ambiguity solution. Shorter, the residual ionospheric delay in the regional enhancemen...
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IPC IPC(8): G01S19/44
CPCG01S19/44
Inventor 邹璇陈亮李宗楠唐卫明施闯
Owner WUHAN UNIV
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