GPS GDOP classification via improved neural network trainings and principal component analysis

Geometric dilution of precision (GDOP) is an engineering expression that denotes how well the constellation of global positioning system (GPS) satellites is organised geometrically. In the analysis of received signals, it is often essential to invert and transform the data matrices. This requires tr...

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Vydáno v:International journal of electronics Ročník 101; číslo 9; s. 1300 - 1313
Hlavní autoři: Azami, Hamed, Sanei, Saeid
Médium: Journal Article
Jazyk:angličtina
Vydáno: Abingdon Taylor & Francis 02.09.2014
Taylor & Francis LLC
Témata:
Algorithms
Back propagation
Classification
Computer simulation
Design engineering
Global Positioning System
Global positioning systems
GPS
GPS GDOP
Levenberg-Marquardt (LM) algorithm
modified LM algorithm
neural network
Neural networks
one-step secant method
Principal component analysis
Principal components analysis
quasi-Newton method
resilient back propagation
Satellite navigation systems
Satellites
scaled conjugate gradient algorithm
Training
ISSN:0020-7217, 1362-3060
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Abstract Geometric dilution of precision (GDOP) is an engineering expression that denotes how well the constellation of global positioning system (GPS) satellites is organised geometrically. In the analysis of received signals, it is often essential to invert and transform the data matrices. This requires tremendous computational burden on the navigator's processor. Since classification of GPS GDOP is a non-linear problem, neural networks (NNs) can be used as an acceptable solution. Since the back propagation (BP) does not have sufficient speed to train a feed-forward NN, in this paper several improved NN trainings, including Levenberg-Marquardt (LM), modified LM, and resilient BP (RBP), scaled conjugate gradient, one-step secant (OSS) and quasi-Newton methods are proposed to classify the GPS GDOP. In this study, in order to have uncorrelated and informative features of the GPS GDOP, principal component analysis (PCA) is used as a pre-processing step. The simulation results show that using the RBP and PCA leads to greater accuracy and lower calculation time comparing with other existing and proposed methods and it can improve the classification accuracy of GPS satellites to about 99.65%. Moreover, the modified LM is the fastest algorithm that requires only 10 iterations for training the NN and it can be used in online applications.
AbstractList Geometric dilution of precision (GDOP) is an engineering expression that denotes how well the constellation of global positioning system (GPS) satellites is organised geometrically. In the analysis of received signals, it is often essential to invert and transform the data matrices. This requires tremendous computational burden on the navigator's processor. Since classification of GPS GDOP is a non-linear problem, neural networks (NNs) can be used as an acceptable solution. Since the back propagation (BP) does not have sufficient speed to train a feed-forward NN, in this paper several improved NN trainings, including Levenberg-Marquardt (LM), modified LM, and resilient BP (RBP), scaled conjugate gradient, one-step secant (OSS) and quasi-Newton methods are proposed to classify the GPS GDOP. In this study, in order to have uncorrelated and informative features of the GPS GDOP, principal component analysis (PCA) is used as a pre-processing step. The simulation results show that using the RBP and PCA leads to greater accuracy and lower calculation time comparing with other existing and proposed methods and it can improve the classification accuracy of GPS satellites to about 99.65%. Moreover, the modified LM is the fastest algorithm that requires only 10 iterations for training the NN and it can be used in online applications.
Author Sanei, Saeid
Azami, Hamed
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SubjectTerms Algorithms
Back propagation
Classification
Computer simulation
Design engineering
Global Positioning System
Global positioning systems
GPS
GPS GDOP
Levenberg-Marquardt (LM) algorithm
modified LM algorithm
neural network
Neural networks
one-step secant method
Principal component analysis
Principal components analysis
quasi-Newton method
resilient back propagation
Satellite navigation systems
Satellites
scaled conjugate gradient algorithm
Training
Title GPS GDOP classification via improved neural network trainings and principal component analysis
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