A dual-channel location estimation system for providing location services based on the GPS and GSM networks

2003 ◽  
Author(s):  
K.K.H. Kan ◽  
S.K.C. Chan ◽  
J.K.-Y. Ng
Keyword(s):  
Location Estimation ◽  
Location Services ◽  
Dual Channel ◽  
Estimation System

A Dual-Channel System for Providing Location Estimation in Mobile Computing

2003 ◽  
Vol 04 (03) ◽  
pp. 271-290 ◽  
Author(s):  
Stephen Ka Chun Chan ◽  
Kenny Ka Ho Kan ◽  
Joseph Kee-Yin Ng
Keyword(s):  
Urban Areas ◽  
Blind Spot ◽  
Location Estimation ◽  
Signal Attenuation ◽  
Channel System ◽  
Location Services ◽  
Estimation Algorithms ◽  
Mobile Operator ◽  
Dual Channel ◽  
Gsm Network

A dual channel system, which is based on the GPS and the GSM Network, is being developed to compensate the problem of the lost of GPS signals in providing location services to mobile users in urban areas. In this design, when GPS signals are being blocked in blind spot areas, GSM positioning algorithms would be used as an alternative method to provide location estimations. This research is an investigation in search of a set of location estimation algorithms based on signal attenuation to work with GPS, so as to develop a dual channel positioning system. With the technical support from a local mobile operator, we have constructed and conducted several real world experiments for our investigation and results are promising.

scholarly journals Device-Free Indoor Location Estimation System Using Commodity Wireless LANs

2021 ◽  
Author(s):  
Yuan Zhou ◽  
Minseok Kim ◽  
Hideaki Momose ◽  
Satoru Yasukawa
Keyword(s):  
Low Cost ◽  
Wireless Lans ◽  
Estimation Method ◽  
Location Estimation ◽  
Mimo Channel ◽  
Indoor Location ◽  
Channel Sounder ◽  
Position Detection ◽  
Estimation System ◽  
Device Free

In recent years, since the propagation channel characteristics have been effectively used for applications such as motion sensing, position detection, etc. A great deal of attention is attracted to channel sounding methods easy to utilize using low-cost devices. This paper presents a device-free indoor location estimation method using spatio-temporal features of radio propagation channels using the 2.4-GHz band 3-by-3 MIMO channel sounder developed using commodity wireless LANs. The measurement results demonstrated a reasonable performance of the proposed method with small number of antennas.

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