Title:
【発明の名称】無線測位システムの改良
Document Type and Number:
Japanese Patent JP2003501633
Kind Code:
A
Abstract:
The invention concerns a method of determining the position or change in position or state of motion of a receiver or receivers, the position or change in position or state of motion of which is or are not already known, in a network of transmission sources some or all of whose positions are known. At a first time, the relative offsets in time, phase, frequency, or derivatives thereof with respect to each other, or with respect to a reference source, of the signals received by a first receiver from a plurality of the transmission sources are measured. At a selected second time, the respective offsets of the signals received by the same or a second receiver, whose position or state of motion is not already known, from the plurality of the transmission sources are measured. Then the position of the receiver or receivers at the first or second times or the change in position of the first receiver between the first and second times or the state of motion of either receiver is calculated from the relationship between the first and second sets of relative offsets.
Inventors:
Bryce James Paul
Duffett-Smith Peter James
Hansen Paul
Duffett-Smith Peter James
Hansen Paul
Application Number:
JP2001500882A
Publication Date:
January 14, 2003
Filing Date:
June 01, 2000
Export Citation:
Assignee:
Cambridge Positioning Systems Limited
International Classes:
G01S1/02; G01S5/06; G01S5/00; G01S5/10; H04W24/00; H04W64/00; (IPC1-7): G01S5/06
Domestic Patent References:
| JPS55103476A | 1980-08-07 |
Foreign References:
| WO1999021028A1 | 1999-04-29 | |||
| EP0437822A2 | 1991-07-24 | |||
| WO1997011384A1 | 1997-03-27 |
Attorney, Agent or Firm:
Minoru Nakamura (9 outside)