公开(公告)号：EP1449005B1

公开(公告)日：2009-03-25

申请号：EP02752163.2

申请日：2002-06-21

申请人： SiRF Technology, Inc.

发明人： SAHAI, Anant ,  TSITSIKLIS, John ,  VAN ROY, Benjamin ,  CHOU, Andrew ,  MANN, Wallace ,  STONE, Jesse, R. ,  FONG, WungKum

IPC分类号： G01S1/04

CPC分类号： G01S19/30

摘要： According to one aspect of the invention, sampled data that is received from a receiver is divided into segments of data of increasing length. A current value range for a delay value and a current value range for a modulation frequency value are calculated relative to each signal source from a set of signal sources that are overhead the signal receiver. An estimate for the delay value and an estimate for the modulation frequency value are calculated by iteratively updating the current value range for the delay value and for the modulation frequency value. The iterative update of the current value range for the delay value and for the modulation frequency value is performed overthe set of signal sources and over the segments of data of increasing length. According to another aspect of the technique, for each signal source, I and Q correlation integrals and their magnitude value are calculated corresponding to the estimate of the modulation frequency value and the estimate of the delay value. In addition, for each signal source, I and Q correlation integrals and thier magnitude values are calculated corresponding to a set of delay values that surround the estimate of the delay value. A shape of a magnitude-curve is interpolated using the magnitude values corresponding to the estimate of the delay value and corresponding to the set of delay values that surround the estimate of the delay value. The location of the receiver is calculated using the shape of the magnitude-curve to represent the I and Q correlation integrals for each signal source.

公开(公告)号：EP1449005A2

公开(公告)日：2004-08-25

申请号：EP02752163.2

申请日：2002-06-21

申请人： SiRF Technology, Inc.

发明人： SAHAI, Anant ,  TSITSIKLIS, John ,  VAN ROY, Benjamin ,  CHOU, Andrew ,  MANN, Wallace ,  STONE, Jesse, R. ,  FONG, WungKum

IPC分类号： G01S1/04

CPC分类号： G01S19/30

摘要： According to one aspect of the invention, sampled data that is received from a receiver is divided into segments of data of increasing length. A current value range for a delay value and a current value range for a modulation frequency value are calculated relative to each signal source from a set of signal sources that are overhead the signal receiver. An estimate for the delay value and an estimate for the modulation frequency value are calculated by iteratively updating the current value range for the delay value and for the modulation frequency value. The iterative update of the current value range for the delay value and for the modulation frequency value is performed overthe set of signal sources and over the segments of data of increasing length. According to another aspect of the technique, for each signal source, I and Q correlation integrals and their magnitude value are calculated corresponding to the estimate of the modulation frequency value and the estimate of the delay value. In addition, for each signal source, I and Q correlation integrals and thier magnitude values are calculated corresponding to a set of delay values that surround the estimate of the delay value. A shape of a magnitude-curve is interpolated using the magnitude values corresponding to the estimate of the delay value and corresponding to the set of delay values that surround the estimate of the delay value. The location of the receiver is calculated using the shape of the magnitude-curve to represent the I and Q correlation integrals for each signal source.