Reliability of Models in Kinematic Deformation Analysis

AbstractA kinematic deformation analysis (KDA) model is mostly preferred to estimate the displacement, velocity, and acceleration parameters in deformation analysis. Different models, such as linear and quadratic, are used in KDA. The displacement, velocity, and acceleration parameters are generally determined by the least-squares estimation (LSE) method. The LSE method smears the effects of the displaced points to the other nondisplaced points. Therefore, it should be noted that although the point is flagged as displaced from the KDA, it may not actually be displaced. Additionally, this may result in incorrect estimation of the velocity or acceleration. In this article, the reliability of the results of different models estimated by the KDA is discussed. To investigate the reliability of the models, different deformation scenarios were simulated in the Global Navigation Satellite Systems (GNSS) network. Different velocity and acceleration parameters were taken into account in these scenarios. The reliability of the KDA models was measured by the mean success rate (MSR). Different approaches for linear and quadratic models—namely, deduction, induction, and quadratic—were considered. According to the results, the solutions of the quadratic model are more successful when the acceleration is considered as zero and nonzero. Also, the MSRs of the induction and deduction models are very similar when the loaded acceleration is considered as zero.