Location Estimation Method Based on Viterbi Algorithm

2009 ◽  
Author(s):  
Takeharu Kohri
Keyword(s):  
Viterbi Algorithm ◽  
Estimation Method ◽  
Location Estimation

Multi-AUV Aided Cooperative 3D-localization for Underwater Sensor Networks

2020 ◽  
Vol 13 (1) ◽  
pp. 80-90 ◽  
Author(s):  
Meiyan Zhang ◽  
Wenyu Cai
Keyword(s):  
Sensor Networks ◽  
Mean Squared Error ◽  
Autonomous Underwater Vehicles ◽  
Estimation Method ◽  
Location Estimation ◽  
Underwater Sensor Networks ◽  
Coverage Ratio ◽  
Minimum Mean Squared Error ◽  
3D Localization ◽  
Localization Scheme

Background: Effective 3D-localization in mobile underwater sensor networks is still an active research topic. Due to the sparse characteristic of underwater sensor networks, AUVs (Autonomous Underwater Vehicles) with precise positioning abilities will benefit cooperative localization. It has important significance to study accurate localization methods. Methods: In this paper, a cooperative and distributed 3D-localization algorithm for sparse underwater sensor networks is proposed. The proposed algorithm combines with the advantages of both recursive location estimation of reference nodes and the outstanding self-positioning ability of mobile AUV. Moreover, our design utilizes MMSE (Minimum Mean Squared Error) based recursive location estimation method in 2D horizontal plane projected from 3D region and then revises positions of un-localized sensor nodes through multiple measurements of Time of Arrival (ToA) with mobile AUVs. Results: Simulation results verify that the proposed cooperative 3D-localization scheme can improve performance in terms of localization coverage ratio, average localization error and localization confidence level. Conclusion: The research can improve localization accuracy and coverage ratio for whole underwater sensor networks.

Self-Organizing Location Estimation Method Using Received Signal Strength

2006 ◽  
Vol E89-B (10) ◽  
pp. 2687-2695 ◽  
Author(s):  
Y. TAKIZAWA ◽  
P. DAVIS ◽  
M. KAWAI ◽  
H. IWAI ◽  
A. YAMAGUCHI ◽  
...  
Keyword(s):  
Estimation Method ◽  
Signal Strength ◽  
Received Signal Strength ◽  
Location Estimation ◽  
Self Organizing

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.

scholarly journals GPS Derived Seismic Signals for Far Field Earthquake Epicenter Location Estimation

2021 ◽  
Vol 3 (1) ◽  
pp. 7-12
Author(s):  
Sha’ameri A.Z. ◽  
Wan Aris W.A. ◽  
Musa T.A.
Keyword(s):  
Estimation Method ◽  
Seismic Signal ◽  
The United States ◽  
Location Estimation ◽  
United States Geological Survey ◽  
Time Of Arrival ◽  
Far Field ◽  
Infrastructure Development ◽  
Time Frequency ◽  
Epicenter Location

A reliable epicenter estimation method is proposed for Global Positioning System (GPS) derived seismic signal for far-field regional earthquake. The main contribution is the use of time-frequency analysis to estimate the time of arrival (TOA) using multilateration technique. The data from the 2004 Sumatra Andaman earthquake captured from four GPS continuously operating reference stations (GPS CORS) were used in the analysis. To validate the accuracy of the proposed method, the estimated epicenter location was compared with the data released by the United States Geological Survey (USGS). The estimated location shows an error of about 0.0572 degrees in latitude and 0.2848 degrees in longitude. The proposed analysis method could complement existing seismometer measurements, improve in understanding of geo-seismic phenomena, and plan future infrastructure development.

scholarly journals Ultrawideband Discharge Source DOA Estimation Method Using Multiple Baseline Wideband Time-Domain Interferometry with Hilbert Transform

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Jiangzehui Yan ◽  
Luping Xu ◽  
Chunhua Li ◽  
Weihao Tie ◽  
Xuerong Sun
Keyword(s):  
Hilbert Transform ◽  
Time Domain ◽  
Elevation Angle ◽  
Estimation Method ◽  
Doa Estimation ◽  
Azimuth Angle ◽  
Location Estimation ◽  
Multiple Baseline ◽  
Baseline Length ◽  
Discharge Source

The research interest of ultrawideband (UWB) discharge source location estimation has increased these years. In this paper, a direction of arrival (DOA) estimation method using multiple baseline wideband time-domain interferometry with Hilbert transform for UWB discharge source is proposed based on time-domain and frequency-domain characteristics of radiated RF electromagnetic pulses (EMPs) from discharge sources. Monte Carlo simulations are then carried out; the results indicate that, the proposed method provides a better performance in UWB discharge source DOA estimation than the traditional time-domain method, especially in low signal-to-noise ratio (SNR) conditions. Moreover, the influences of antenna array configurations and incident angles of radiated EMPs on the estimation precision are also studied. It has been shown that, the accuracy of both elevation angle and azimuth angle estimation improves with the increase of the antenna element number and baseline length. As for the influence of incident angles, the estimation accuracy of elevation angle enhances when real elevation angle increases, while that of azimuth angle tends to be opposite. Meanwhile, the real azimuth angle has little effect on the DOA estimation. Finally, an experimental setup for discharge source DOA estimation is introduced and the experiment results are illustrated.

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