公开(公告)号：EP1352259A2

公开(公告)日：2003-10-15

申请号：EP01992170.9

申请日：2001-12-19

申请人： MOTOROLA, INC.

发明人： PATWARI, Neal, K. ,  O'DEA, Robert, J. ,  ALLEN, Vernon, A. ,  PERKINS, Matthew, R. ,  BOURGEOIS, Monique, J.

IPC分类号： G01S1/00

CPC分类号： G01C21/206 ,  G01S5/0018 ,  G01S5/0072 ,  G01S5/0289 ,  G01S11/02 ,  G01S13/84 ,  G01S2205/002

摘要： A system for locating a number of devices (112-130) by measuring signals transmitted between known location devices (112-118, 134-138, 214-218, 224-228) and unknown location devices (120-130, 222), and signals transmitted between pairs of unknown location devices (120-130,222), entering signal measurements into a graph function that includes a number of first sub-expressions, a number of which include signal measurement prediction sub-expressions, and have extrema when a predicted signal measurement is equal to an actual signal measurement, and optimizing the graph function.

公开(公告)号：EP1504425A1

公开(公告)日：2005-02-09

申请号：EP03726572.5

申请日：2003-05-01

申请人： MOTOROLA, INC.

发明人： JOHNSON, Mark, J. ,  PERKINS, Matthew, R. ,  O'DEA, Robert, J. ,  BANCROFT, Timothy, J. ,  KRIZIK, Mark, A. ,  PATWARI, Neal, K.

IPC分类号： G08B13/02

CPC分类号： G08B21/0211 ,  G07C1/20 ,  G07C9/00111 ,  G08B21/0227 ,  G08B21/0294

摘要： A set of characteristics of an environment is inferred by obtaining at least a first location estimate of a first device at a first time and a second location estimate of the first device at a second time. A first path traveled (240) by the first device is established based on at least the first location estimate of the first device at the first time and the second location estimate of the first device at the second time. At least one characteristic of the environment is inferred based on the first path traveled by the first device.