GPS multi-receiver direct position estimation for aerial applications
Chu, Arthur Hsi-Ping
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https://hdl.handle.net/2142/101449
Description
Title
GPS multi-receiver direct position estimation for aerial applications
Author(s)
Chu, Arthur Hsi-Ping
Issue Date
2018-07-18
Director of Research (if dissertation) or Advisor (if thesis)
Gao, Grace X
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Global Navigation Satellite System (GNSS)
Global Positioning System (GPS)
Direct Positioning
Maximum Likelihood Estimation
GNSS receiver, Multi-Receiver
Abstract
Modern aviation safety increasingly depends on reliable GPS services, while signal degrading effects such as multipath and masking often occur during critical flight phases, such as take-off and landing. In this regard, we propose Multi-Receiver Direct Position Estimation (MR-DPE), which operates a network of DPE receivers to enhance GPS measurement certainty in degraded signal environments. A DPE receiver directly estimates navigation solutions in the PVT domain with a maximum-likelihood approach, bypassing the intermediate range measurements. Whereas prior works have shown the enhanced measurement certainty of DPE under weak signals, MR-DPE provides further improvement by leveraging the information redundancy and the geometric diversity provided by the network of receivers and antennas. We implemented MR-DPE using software-defined radio and conducted comprehensive, full-scale flight experiments, a first for DPE-related works. A wide range of flight profiles were explored, especially those prone to signal multipath and masking, and preliminary analyses were performed on the data collected to ensure the conceptual validity of MR-DPE.
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