Sensor node having self localization function and self localization method thereof
AssigneeElectronics and Telecommunication Research Institute
InventorsJong-jun PARK, Hoon Jeong, Seong-soon Joo, Jong-suk Chae
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Abstract
Disclosed are a sensor node having a self localization function and a self localization method of the sensor node. The sensor node calculates a location thereof by receiving location information measured at each of two mobile nodes at different times and using four location information of the received location information. Additional cost and power consumption required for installing additional equipment such as an anchor node, a ultrasonic transceiver and a signal amplifier are reduced.
Claims10
A sensor node having a self localization function, the sensor node comprising:
- a location information receiving unit to receive information about locations measured at each of two mobile nodes at different times;
- and
- a self localization unit to calculate a location of the sensor node by using four location information of the information received from the two mobile nodes.
A self localization method of a sensor node, the method comprising:
- receiving location information measured at each of two mobile nodes at different times;
- calculating a center of gravity of a virtual square formed based on four locations included in the location information;
- selecting a mobile node closer to the sensor node from the two mobile nodes by using a link quality indicator (LQI) of packets transmitted from the two mobile nodes;
- calculating a predetermined point of a virtual line connecting two locations, which are included in location information transmitted from the selected mobile node, by using a link quality indicator (LQI) of the selected mobile node;
- calculating a slope of the virtual line;
- calculating a shortest distance between the virtual line and the center of gravity;
- determining, as a location of the sensor node, a location which is separated by the shortest distance from the predetermined point;
- and
- selecting, as the location of the sensor node, a location which has been translated from the predetermined point in perpendicular to the virtual line by the shortest distance.
Dependencies are inferred from the claim text.