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Dealing with Observation Outages within Navigation Data using Gaussian Process Regression

Published online by Cambridge University Press:  14 February 2014

Hongmei Chen
Affiliation:
(School of Instrument Science and Engineering, Southeast University, China) (Key Laboratory of Micro-Inertial Instrument and Advanced Navigation, China) (Luoyang Institute of Science and Technology, China)
Xianghong Cheng*
Affiliation:
(School of Instrument Science and Engineering, Southeast University, China) (Key Laboratory of Micro-Inertial Instrument and Advanced Navigation, China)
Haipeng Wang
Affiliation:
(School of Instrument Science and Engineering, Southeast University, China) (Key Laboratory of Micro-Inertial Instrument and Advanced Navigation, China)
Xu Han
Affiliation:
(School of Instrument Science and Engineering, Southeast University, China) (Key Laboratory of Micro-Inertial Instrument and Advanced Navigation, China)
*

Abstract

Gaussian process regression (GPR) is used in a Spare-grid Quadrature Kalman filter (SGQKF) for Strap-down Inertial Navigation System (SINS)/odometer integrated navigation to bridge uncertain observation outages and maintain an estimate of the evolving SINS biases. The SGQKF uses nonlinearized dynamic models with complex stochastic nonlinearities so the performance degrades significantly during observation outages owing to the uncertainties and noise. The GPR calculates the residual output after factoring in the contributions of the parametric model that is used as a nonlinear SINS error predictor integrated into the SGQKF. The sensor measurements and SINS output deviations from the odometer are collected in a data set during observation availability. The GPR is then applied to predict SINS deviations from the odometer and then the predicted SINS deviations are fed to the SGQKF as an actual update to estimate all SINS biases during observation outages. We demonstrate our method's effectiveness in bridging uncertain observation outages in simulations and in real road tests. The results agree with the theoretical analysis, which demonstrate that SGQKF using GPR can maintain an estimate of the evolving SINS biases during signal outages.

Type
Research Article
Copyright
Copyright © The Royal Institute of Navigation 2014 

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