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Multipath Error Modeling Methodology for GNSS Integrity Monitoring Using a Global Optimization Strategy
2022
Remote Sensing
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Valid multipath error model is the prerequisite for high-performance GNSS integrity monitoring. It is indispensable to civil aviation and other Safety-of-Life (SoL) users. ...
In addition, the new model form with two inflation factors brings average CDF difference reduction of 67.4% at B1I and 50.6% at B3I, which means significantly mitigation in terms of conservatism. ...
Acknowledgments: We are sincerely grateful for the data support of IGS, the effort of respectful reviewers and academic editor in improving this article, and the timely assistance of assistant editor. ...
doi:10.3390/rs14092130
fatcat:zptrk6qpnvfitfjuqamw2e7edu
An advanced residual error model for tropospheric delay estimation
2020
GPS Solutions
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We introduce a new approach to derive residual tropospheric delay error models using the extreme value analysis technique. ...
Seventeen years of global numerical weather model fields are analyzed, and new residual error models are derived for some recently developed tropospheric delay models. ...
Acknowledgements : Open access funding provided by Budapest University of Technology and Economics. ...
doi:10.1007/s10291-020-01017-7
fatcat:ftcmvakq7bcs3ln4buio6nyi3u
An Error Overbounding Method Based on a Gaussian Mixture Model with Uncertainty Estimation for a Dual-Frequency Ground-Based Augmentation System
2022
Remote Sensing
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This conservatism may cause false alarms and diminish availability. ...
However, the Ifree algorithm outputs the errors of two frequencies. The protection level obtained via the traditional Gaussian overbound is overconservative. ...
Acknowledgments: The authors would like to thank the researchers at the National Key Laboratory of CNS/ATM for their advice and interests. ...
doi:10.3390/rs14051111
fatcat:vp4yyyc44fa2hlvezzs2sgci3e
A Class of PID Controllers Tuned in Fractional Representation
2012
IFAC Proceedings Volumes
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In the paper, this parameter is used for aperiodic tuning of PI controllers. The methodology is utilized for autotuning principles and for robust applications. ...
Interval perturbations in controlled systems and robustness of proposed algorithms are outlined through the value set concept, zero exclusion condition and Kharitonov theorem. ...
On the other hand, the investigation of robust stability for "overbounding" interval polynomial can be superfluously conservative as will be shown later. ...
doi:10.3182/20120328-3-it-3014.00109
fatcat:cjus7irhwng7hirn2zhbp7gp4a
Robust Stability and Performance Analysis for State-Space Systems via Quadratic Lyapunov Bounds
1990
SIAM Journal on Matrix Analysis and Applications
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These are problems of robust stability and performance analysis. ...
This technique has been extensively developed for both analysis and synthesis (see, e.g., 8 ]-37 ). ...
Daubendiek for producing the numerical results in 11. Note added in proof. The assumption x(0) 0 in (2.2) is stronger than necessary for the treatment of (2.4). ...
doi:10.1137/0611017
fatcat:kbnymlviuvbajiwjdmjhfyfxne
Optimal Popov controller analysis and synthesis for systems with real parameter uncertainties
1996
IEEE Transactions on Control Systems Technology
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Recent research has investigated the use of absolute stability criteria to develop less conservative analysis tests for systems with linear and nonlinear real parameter uncertainties. ...
Robust performance analysis plays an important role in the design of controllers for uncertain multivariable systems. ...
Grocott, and Dr. D. Miller). ...
doi:10.1109/87.486347
fatcat:wsrr3idwcjb6hif5mssjwoh7se
Estimation of model quality
1995
Automatica
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The problem of marrying system identification and modern robust control theory has resulted in significant research activity. A survey of the outcomes of this effort is presented. ...
Acknowledgemenr-The authors are very grateful to the reviewers for their many valuable comments that greatly improved this work. ...
The tools are mainly those of functional analysis, operator theory and analytic topology, which may be intimidating for a practitioner, but for the theoretician allows such things as the elegant unification ...
doi:10.1016/0005-1098(95)00108-7
fatcat:pe37yg5uhfedrbqjhwi54e46z4
Estimation of Model Quality
1994
IFAC Proceedings Volumes
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The problem of marrying system identification and modern robust control theory has resulted in significant research activity. A survey of the outcomes of this effort is presented. ...
Acknowledgemenr-The authors are very grateful to the reviewers for their many valuable comments that greatly improved this work. ...
The tools are mainly those of functional analysis, operator theory and analytic topology, which may be intimidating for a practitioner, but for the theoretician allows such things as the elegant unification ...
doi:10.1016/s1474-6670(17)47691-9
fatcat:sreewb52cndrliu4immw7pu6q4
Density-functional approaches to noncovalent interactions: A comparison of dispersion corrections (DFT-D), exchange-hole dipole moment (XDM) theory, and specialized functionals
2011
Journal of Chemical Physics
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For overall results, M05-2X, B97-D3, and B970-D2 yield superior values in conjunction with aug-cc-pVDZ, for a mean absolute deviation of 0.41 -0.49 kcal/mol, and B3LYP-D3, B97-D3, ωB97X-D, and B2PLYP-D3 ...
evaluations of binding strength compiled for molecular complexes of diverse size and nature. ...
by the basis employed for the respective level of theory. ...
doi:10.1063/1.3545971
pmid:21361527
fatcat:434pdlfu3jho3dagqjmuq23him
Limited sensitivity analysis of ARAIM availability for LPV-200 over Australia using real data
2016
Advances in Space Research
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The effect of reducing URA to 1 m, as a conservative future value, is first compared with the use of current broadcast URA values, where the same GPS data was processed in the two cases. ...
GPS fault probabilities In ARAIM computations, overbounding of observation errors are classified into two levels: one for integrity evaluation and another affects continuity and accuracy. ...
doi:10.1016/j.asr.2015.10.046
fatcat:sj52pxl4rzcnnforutlaqhaa3m
Deep Q-learning: a robust control approach
[article]
2022
arXiv
pre-print
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We show the instability of learning and analyze the agent's behavior in frequency-domain. Then, we ensure convergence via robust controllers acting as dynamical rewards in the loss function. ...
The role of the target network is overtaken by the control input, which also exploits the temporal dependency of samples (opposed to a randomized memory buffer). ...
Meanwhile, control theory is seldom utilized to enhance the agent's training performance. ...
arXiv:2201.08610v1
fatcat:l3ub6jhwtjdz3o5hyns6ef57te
Robust Stability of a Class of Unstable Systems under Mixed Uncertainty
2011
Journal of Control Science and Engineering
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For unstable plants, the priority of control goes to the stability of synthesis, which means to find a stabilizer controller. ...
The problem was solved by a conservative method based on generalized Kharitonov's theorem and Nevanlinna-Pick's interpolation (NPI) technique. ...
The applications of the Kharitonov theory to the analysis and synthesis of control systems have been introduced in many literatures such as [4] [5] [6] [7] [8] . ...
doi:10.1155/2011/970962
fatcat:3ybzcwxgf5cw7nit2aietemw6u
PALO: a probabilistic hill-climbing algorithm
1996
Artificial Intelligence
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Many learning systems search through a space of possible performance elements, seeking an element whose expected utility, over the distribution of problems, is high. ...
These results suggest approaches to solving the utility problem from explanation-based learning, the multiple extension problem from nonmonotonic reasoning and the tractability/completeness tradeoff problem ...
Acknowledgements This work began at the University of Toronto, where it was supported in part by the Institute for Robotics and Intelligent Systems and by an operating grant from the National Science and ...
doi:10.1016/0004-3702(95)00040-2
fatcat:gqjfb7nxibhslnlc4ib7jhjqjy
Set-valued observers and optimal disturbance rejection
1999
IEEE Transactions on Automatic Control
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We then consider the utility of set-valued observers for disturbance rejection with output feedback and derive the following general separation structure. ...
A set-valued observer (also called guaranteed state estimator) produces a set of possible states based on output measurements and models of exogenous signals. ...
We then investigate the utility of set-valued observers for -induced norm optimal disturbance rejection. ...
doi:10.1109/9.746252
fatcat:pxjd5rjvl5eere2lkmvzwkqxcy
Paired overbounding and application to GPS augmentation
PLANS 2004. Position Location and Navigation Symposium (IEEE Cat. No.04CH37556)
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This paper introduces a theorem that guarantees a conservative error bound (overbound) in the position domain given similarly conservative overbounds for broadcast pseudorange statistics. ...
States and Europe, the required inflation factor for broadcast sigma is only 1.18, even for biases as large as 10 cm for each satellite. ...
The opinions discussed here are those of the authors and do not necessarily represent those of the FAA or other affiliated agencies. ...
doi:10.1109/plans.2004.1309027
fatcat:ljrrqaar7vh5hnyabk2vn5pvly
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