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Study of the Integer Ambiguity Resolution in the RTK System

Author: ZhaoZuo
Tutor: SunGuangFu
School: National University of Defense Science and Technology
Course: Information and Communication Engineering
Keywords: RTK Carrier phase Ambiguity LAMBDA method The ambiguity drop related technologies TIKHONOV regularization method
CLC: P228.4
Type: Master's thesis
Year: 2007
Downloads: 380
Quote: 1
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Abstract


The satellite navigation system in single-frequency RTK (Real Time Kinematic) technology to reduce terminal costs, to improve the positioning accuracy of important technical Ambiguity solving one of the key technologies to achieve RTK. Starting from the actual needs of the RTK system, in-depth study of a single-frequency RTK systems Ambiguity fast solution techniques. The main content of this paper is as follows: first RTK system, working principle and the main source of error is introduced. On this basis, from the applicability, calculate the amount of search time and search range controllability analysis and comparison of a variety of Ambiguity solver, choose a better performance of the LAMBDA method as the basis for this study. Focused on enhancing the ambiguity solving performance of two key factors: the float solution accuracy and efficiency of search methods, the use of anti-morbid estimates joint decorrelation Ambiguity strategy combined sequential conditional least squares, based on the ambiguity of the LAMBDA method solver algorithm has been optimized. Morbid serious quickly locate the Sino-French equation for the single-frequency characteristics of two TIKHONOV regularization method, numerical results show that: the regularization methods to improve the estimation precision floating-point solution, not only can reduce the search to the correct ambiguity solution required epoch number, and can speed up the search speed of each epoch ambiguity, more conducive to real-time processing. Improve search efficiency in order to reduce the complexity of the LAMBDA method drop further, two more simple drop-correlation algorithm: iterative method and joint decorrelation method, numerical results show that: the joint go soundness of the relevant law for rounding errors and noise caused by morbid decomposition, the treatment success rate than the iterative method. Combination of research, to build a simulation test system, module testing, system testing method, in the mixed the Constellation conditions under Compass II, consolidated ambiguity solver algorithm was validated. The results show that a mixed constellation conditions by the MEO satellite IOSO satellite algorithms can still quickly obtained a higher success rate Ambiguity accurate relative positioning results, suitable for RTK system initialization . The results of this research can be applied to the monitoring receiver Compass II system, the user's machine and master station positioning and precise orbit determination applications and provide technical support for single-frequency RTK technology widely used in China's second-generation satellite navigation system .

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > Geodesy > Satellite geodesy and space geodesy > Global Positioning System (GPS)
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