Abstract:
PURPOSE: A method and a device for determining a heading angle of a wireless LAN are provided to prevent the accumulation of PDR position errors by using a heading angle detecting algorithm based on a wireless LAN even in a GPS shadow region and to accurately determine the information of a user position. CONSTITUTION: A device for determining a heading angle of a wireless LAN comprises modems(710,715), a control unit(720), and a memory unit(730). The modems perform communication with other nods. The control unit test whether the rotation of a user is sensed or not by using the modems. A moving direction vector is obtained when sensing the rotation of the user, and the heading angle is obtained by using the obtained moving direction vector. The memory unit records signal intensity according to distances to reference points and signal intensity according to a distance to an AP. [Reference numerals] (710) Modem 1; (715) Modem 2; (720) Control unit; (730) Memory unit; (740) Positioning unit
Abstract:
A map matching apparatus of the navigation for pedestrians using dead reckoning and a method thereof are provided to minimize accumulative influence of error caused by the dead reckoning by matching map by correcting the matched location to a new initial position. A map matching apparatus(100) of the navigation for pedestrians using dead reckoning comprises a dead reckoning part(110), a current position estimating part(120), a link selection part(130), a matching part(140). The dead reckoning part estimates traveling direction and relative translation distance from initial position. The current position estimating part estimates the current position by reflecting the traveling direction and the relative translation distance. The link selection part selects the matched link from a map including the current position. The matching part indicates the current position on the link by matching the current position. The map matching device matches the map by setting up the location matched on the link at the new initial position.
Abstract:
PURPOSE: A waking state estimating apparatus and method for estimation of step length using a portable terminal are provided to improve the accuracy of step length estimation in a portable terminal. CONSTITUTION: A waking state estimating method for estimation of step length using a portable terminal comprises a step(505) of setting an observation row using estimated temporary step length, acceleration distribution, and step frequency, a step of creating an observation probability vector, which includes probabilities according to walking state based on the observation row, a step of calculating the final probabilities according to walking state by multiplying the observation probability vector by one or more of state transition probability vectors, a step(507) of determining a walking state having the maximum final probability as the final walking state, and a step(509) of estimating the temporary step length using integral parameters.
Abstract:
PURPOSE: An apparatus and method for detecting location information using a navigation algorithm like radio navigation and walking navigation are provided to accurately identify the location information of a user even in an environment in which a car navigation system is unable to provide the location information of the user. CONSTITUTION: An apparatus for detecting location information comprises an UI(User Interface), a GPS(Global Positioning System) receiving unit(103), and a navigation algorithm control unit. The UI interfaces with a user. The GPS receiving unit searches around a GPS satellite and receives pseudo range information from at least one of searched GPS satellites. The navigation algorithm control unit calculates the displacement of a pedestrian terminal based on detected steps of a pedestrian and corrects the displacement of the pedestrian terminal calculated by using the received pseudo range information. The navigation algorithm control unit measures the location of the pedestrian terminal by using a corrected value.
Abstract:
PURPOSE: A position estimation device and method using an acceleration sensor are provided to calculate gravity acceleration without a rotary motion component by using three shaft angular speed measured by a gyro sensor and three shaft acceleration measured by acceleration sensors. CONSTITUTION: First and second acceleration sensors measure three shaft acceleration. A gyro sensor measures three shaft angular speed of a position estimation device. A magnetic sensor detects an azimuth of the position estimation device. A sensor signal processor converts analog sensor signals to a sensor signal for digital calculation. [Reference numerals] (110) Controller; (120) Memory unit; (132) Display unit; (134) Touch sensing unit; (136) Pressurization sensing unit; (140) Interface unit