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Registered METHOD OF ESTIMATING POSITION OF MOBILE NODE IN WIRELESS SENSOR NETWORK

무선 센서망에서 수동모드 단방향 거리추정 방식에 의한 이동 노드의 위치 추정 방법
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Inventors
Nam Yoon Seok, Huh Jae Doo, Park Kwang Roh
Application No.
12866917 (2008.10.10)
Publication No.
20110007650 (2011.01.13)
Registration No.
8543132 (2013.09.24)
Country
UNITED STATES
Project Code
07MH2800, Development of HD Class Multimedia System Technology over Wireless Home Network, Huh Jae Doo
Abstract
The present invention relates to a method of estimating the position of a mobile node in a wireless sensor network using a passive mode OWR method. The method includes: estimating frequency offsets of anchor nodes and a mobile node; allowing the anchor nodes to sequentially transmit ranging frames; allowing the mobile node to receive the ranging frames and to estimate the difference between the reception times of signals from two anchor nodes; and applying the estimated difference between the reception times of the signals to time difference of arrival (TDOA) to estimate the position of the mobile node. According to the above-mentioned structure of the present invention, a plurality of mobile nodes can estimate their positions with a minimum number of ranging frame transmissions, without using a separate network synchronization unit. In addition, it is possible to easily construct a wireless sensor network for position recognition, and rapidly and accurately perform distance estimate using an OWR method.
KSP Keywords
Distance estimate, Mobile node(MN), Sensor networks, Static wireless sensor networks(WSNs), Synchronization Unit, Time Difference of Arrival(TDOA), anchor nodes, difference of arrival, frequency offset, network Synchronization, passive mode, position recognition, time difference, wireless sensor