摘要:
An object of the present invention is to implement accurate positioning of a mobile communication terminal even in an environment in which delay waves are included in radio waves arriving at the mobile communication terminal from radio wave sources. A positioning server 10 forming a positioning system for estimating a location of a cellular terminal 20 has a distance information acquisition unit 13 for acquiring information indicating distances calculated based on radio waves transmitted and received between a plurality of cellular base stations 30 and the cellular terminal 20; a direction information acquisition unit 14 for acquiring a plurality of pieces of information indicating directions of radio waves received by the cellular terminal 20; a virtual sector calculation unit 15 for calculating for each of the cellular base stations, a range of directions from the cellular base station 30 to the cellular terminal 20 from the information indicating the directions of the radio waves, based on a range calculation rule stored in advance; and a location calculation unit 16 for calculating the location of the cellular terminal 20, based on the distances and the range of directions.
摘要:
A positioning system accurately estimates transmission times of signals from a signal transmitter and measures a position of a receiver on the basis of the transmission times. The receiver 10 comprises a velocity-vector calculating unit 12 calculating velocity vectors of GPS satellites 20 on the basis of signals from the GPS satellite; a satellite selecting unit 13 generating a combination of velocity vectors from the calculated velocity vectors and selecting a combination of GPS satellites from the GPS satellites on the basis of the combination of velocity vectors; a position calculating unit 15 calculating positions of the receiver 10 at a plurality of times, the times being signal transmission times, on the basis of signals from the selected GPS satellites; and a position-accuracy evaluating unit 17 evaluating the accuracy of the calculated positions of the receiver 10, setting one time selected from the plurality of times corresponding to the plurality of positions as a transmission time, and setting the position of the receiver 10 corresponding to the transmission time as an estimated position.
摘要:
The present invention easily evaluates the positioning accuracy by using fewer signal sources. The receiver is a positioning system for estimating the position of the receiver itself which is constituted by: a distance calculation section which calculates information indicating the respective distances between a plurality of GPS satellites and the receiver on the basis of signals which are transmitted by the plurality of GPS satellites and received by the receiver; a position calculation section which calculates the position of the receiver from information indicating the positions of the respective GPS satellites and information indicating the respective distances thus calculated; a distance difference calculation section which calculates, for each of the GPS satellites, the differences between the respective distances from the calculated position of the receiver to the respective GPS satellites, and the respective distances calculated by the distance calculation section; and a position accuracy evaluation section which evaluates an accuracy of the calculated position of the receiver on the basis of variation, between the GPS satellites, of the calculated differences, for each of the GPS satellites.
摘要:
An apparatus having multiple mushroom structures is disclosed. Each of the multiple mushroom structures includes: a ground plate; a first patch provided parallel to the ground plate with a separation of a distance to the ground plate; and a second patch provided parallel to the ground plate with a separation of another distance to the ground plate, which another distance being different from the distance from the first patch to the ground plate, wherein the second patch is a passive element which is capacitatively coupled with at least the first patch.
摘要:
A propagation path estimation method using an imaging method according to the invention includes a step of, in a case where a reflect array 1 (structure) which causes reflection and scattering in a predetermined direction (θ-η)° different from a specular reflection direction θ° exists on a propagation path, rotating the reflect array 1 by η/2° about a rotation center O to set a virtual rotated reflect array 2 (virtual structure), and estimating the propagation path by using the virtual rotated reflect array 2.
摘要:
An apparatus having multiple mushroom structures is disclosed. Each of the multiple mushroom structures including: a ground plate; a first patch provided parallel to the ground plate with a separation of a distance to the ground plate; and a second patch provided parallel to the ground plate with a separation of another distance to the ground plate, which another distance being different from the distance from the first patch to the ground plate, wherein the second patch is a passive element which is capacitatively coupled with at least the first patch.
摘要:
A method and apparatus for estimating whether or not a wireless terminal is indoors are disclosed. The illustrative embodiment employs a pattern classifier that is trained on a plurality of input/output mappings, where each mapping corresponds to a respective location, the output of the mapping is a Boolean value that indicates whether the location is indoors, and the input of the mapping is based on empirical and predicted signal data for the location. In accordance with the illustrative embodiment, a computer-executable program is generated based on the trained pattern classifier. The computer-executable program estimates whether or not a wireless terminal is indoors based on empirical data reported by the terminal, and on a location estimate for the terminal that might be crude or inaccurate (e.g., based on Cell Identifier [Cell-ID], GPS, etc.).
摘要:
It is an object of the present invention to perform positioning at the proper positioning time and positioning precision in response to a requirement with respect to positioning. A positioning server 10 comprises a first positioning component 12 that performs positioning of a cellular terminal 20 by a hybrid algorithm 1, in which indoor/outdoor determination is performed on the basis of reception state information indicating the reception state at the cellular terminal 20, and in which an end condition is determined on the basis of the result of the indoor/outdoor determination; and a second positioning component 13 that performs positioning of the cellular terminal 20 by a hybrid algorithm 2, in which the approximate position of the cellular terminal 20 is calculated on the basis of reception state information indicating the reception state at the cellular terminal 20, and in which whether or not to end the positioning of the cellular terminal 20 is decided on the basis of the precision of the approximated position.
摘要:
A multi-beam reflectarray includes two or more element arrays including plural elements aligned along a predetermined direction. The multi-beam reflectarray is such that, in each of a first element group and a second element group included in at least one of the element arrays, a difference between phases of radio waves reflected by corresponding two elements is in proportion to a first product of a distance between the two elements and a value of a trigonometric function with respect to an angle of reflection by the two elements, and a distance between neighboring elements in the first element group is equal to a product of a rational number and a distance between neighboring elements in the second element group.
摘要:
A method and apparatus for estimating whether or not a wireless terminal is indoors are disclosed. The illustrative embodiment employs a pattern classifier that is trained on a plurality of input/output mappings, where each mapping corresponds to a respective location, the output of the mapping is a Boolean value that indicates whether the location is indoors, and the input of the mapping is based on empirical and predicted signal data for the location. In accordance with the illustrative embodiment, a computer-executable program is generated based on the trained pattern classifier. The computer-executable program estimates whether or not a wireless terminal is indoors based on empirical data reported by the terminal, and on a location estimate for the terminal that might be crude or inaccurate (e.g., based on Cell Identifier [Cell-ID], GPS, etc.).