Abstract:
Wi-Fi 시스템에서 접속 지점(AP; Access Point)의 위치 추정 방법 및 장치가 제공된다. 상기 위치 추정 장치는 적어도 3개의 측정 지점(MP; Measurement Point)에서 상기 AP로부터 전송되는 신호의 세기를 측정하고, 가상 감쇠 인자(imaginary attenuation factor)를 선택하고, 상기 가상 감쇠 인자와 상기 각 MP에서 측정된 신호의 세기를 기반으로 상기 각 MP와 상기 AP 간의 거리를 각각 계산하고, 상기 각 MP의 위치를 중심으로 하고 상기 각 MP와 상기 AP 간의 거리를 반지름으로 하는 범위원(ranging circle)들의 교차점을 각각 계산한다. 상기 가상 감쇠 인자가 변화하면서 서로 다른 교차점이 계산되며, 이 중 최적 교차점이 결정된다. 상기 최적의 교차점이 상기 AP의 위치로 추정된다.
Abstract:
Disclosed are a method and a device for compensation when estimating the location of a wireless network element from information collected from heterogeneous terminals. A method for estimating the location of a wireless network element is a method realized through a computer, and can include the following steps: a step wherein a wireless network element locating server receives information about the received signal strength of a wireless network element and information about the location of heterogeneous terminals from the heterogeneous terminals; a step of revising the received signal strength information from the heterogeneous terminals into received signal strength information from a predetermined reference terminal by using a pre-generated difference value model for the received signal strength of the wireless network element among the heterogeneous terminals; and a step of estimating the location of the wireless network element by using the revised, received signal strength information from the reference terminal and the received location information. [Reference numerals] (110) Wireless network element;(120) Different type device;(130) Database;(140) Wireless network element positioning server
Abstract:
PURPOSE: A monitor system which uses a mobile network, a master sensor node and a server device are provided to perform real time monitoring with minimum manpower by autonomously recognizing event generation between the master sensor node and a server. CONSTITUTION: A sensor(100) transmits event information to a sensor node(200) through a wireless channel. A sensor node is connected to the sensor through a wire channel. The sensor comprises a padding sensor buried under the road or underground. The sensor node obtains image information an event generation source and/or azimuth showing the direction of the event generation source. A master sensor node(300) is connected to the sensor node through the wireless channel. A server(400) finally determines whether an event generates or not by utilizing the event information delivered from MSN, the image information and/or statistical data about event generation.
Abstract:
PURPOSE: A method and an apparatus for estimating a location of an access node are provided to accurately estimate a location of an AP to a measurement point. CONSTITUTION: The strength of a signal which is transmitted from an AP is measured. An imaginary attenuation factor is selected. Distance between the MP and the AP is calculated(S110). A cross point of range circles is calculated(S120). An optimum cross point is calculated(S150). The optimum cross point is estimated to the location of the AP.