Positioning Method by Two GNSS Satellites and Distance Sensor in Urban Area

Hiroyuki HATANO  Tomoya KITANI  Masahiro FUJII  Atsushi ITO  Yu WATANABE  Hironobu ONISHI  Toru AOKI  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E98-A    No.1    pp.275-283
Publication Date: 2015/01/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E98.A.275
Type of Manuscript: Special Section PAPER (Special Section on Intelligent Transport Systems)
GNSS,  GPS,  Global Positioning System,  localization,  multipath,  NLOS,  shielded signals,  

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For estimating user's location, Global Navigation Satellite System (GNSS) is very useful. Especially, Global Positioning System (GPS) by USA is very popular. A GPS receiver needs multiple satellites (usually 4 and more satellites). Propagation to the satellites needs line-of-sight. However, in urban area, there are many buildings. Received signals tend to become bad quality. Such signals are often called as non-line-of-sight (NLOS) or multipath signals. The problem is that the receiver cannot get line-of-sight signals from adequate number of the satellites coinstantaneously. This case leads to degradation of estimation quality or impossibility of estimation. In this paper, we will introduce a novel estimation algorithm, which can estimate own position with as low number of satellites as possible. The proposal achieves the estimation by only two satellites. The proposal also uses a traveling distance sensor which is often equipped on vehicles. By recorded satellite data, we will confirm our effectiveness.