Evaluate and Design the Method of A Solution to the Ill-conditioned GPS Positioning Problem
Date Issued
2009
Date
2009
Author(s)
Ting, Chih-Yi
Abstract
For normal positioning of using GPS receiver, it is required that there are at least four GPS satellites in view. However, due to the blockage of the tall buildings and receive unhealthy satellites signal, it is sometimes not able to reach that minimum requirement so that the operation of GPS receiver may be interrupted.n dealing with such ill-conditioned problems, different algorithm such as altitude-hold method, clock bias predictor and pseudorange predictor are used in this thesis. In order to attain more accurate positioning, we consider different methods to find the best positioning solution : LS(Least Squares), WLS(Weighted Least Squared), KF(Kalman Filter), RKF(Robust Kalman Fitler) and CF(Constraint Filtering).or different number of visible satellites, the applicability of different methods depends on the capability of the adopted method. In addition to solving the ill-conditioned problem, static and dynamic experiments were conducted by using the simulator SimGen to evaluate the duration of usage of various schemes for acceptable errors.
Subjects
Ill-conditioned
Type
thesis
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