Author: Zhang, Guohao
Title: Adaptive kalman filter for GNSS/INS integration based on PIXHAWK for UAV applications
Degree: M.Sc.
Year: 2017
Subject: Hong Kong Polytechnic University -- Dissertations
Drone aircraft
Vehicles, Remotely piloted
Drone aircraft -- Control systems
Department: Faculty of Engineering
Pages: x, 99 pages : color illustrations
Language: English
Abstract: Since the Unmanned Aerial Vehicle (UAV) is developed with higher accuracy and mobility, its usage is increased for civil applications. However, those civil applications always require UAV to operate near or inside the urban area. The GNSS signal will suffer from an extra traveling distance by signal reflection from building surface, and further introduce large localization error, namely the multipath effect. Since the multipath effect is unable to be solved but to mitigate its influence, the multi-sensor integrated localization method is the common method to decrease the multipath error. The Kalman Filter (KF) is widely used to integrate GNSS with INS measurements with a confident coefficient in between. As for better localization estimation from KF in complex urban environment, the target is to tune an appropriate weighting between GNSS and INS for different situation during operation. In this study, an adaptive Kalman filter is developed to adjust the measurement noise covariance matrix with different GNSS measurement conditions. The Allan Variance Analysis technique is used to study the characteristics of the IMU sensors and determines the process noise covariance matrix. Then the principle component analysis is employed to study the relationship between positioning error and GNSS features and selecting the key features and classification range. The supervised machine learning model is trained with real operation data covered most situations, and further used to predict the current GNSS measurement condition during operations. To relieve the mis-classification error from machine learning, the fuzzy logic algorithm is designed to avoid the sudden change of classification result. Finally, the localization performance of the proposed adaptive Kalman filter is compared with different classification method, including decision tree, random forest and random forest with fuzzy logic. The result proving that, the presented adaptive Kalman filter using random forest with fuzzy logic can achieve better GNSS measurement condition classification and further obtain more accurate localization result, ensure the safety of UAV operating in urban area.
Rights: All rights reserved
Access: restricted access

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