Title:
イベント位置の決定
Document Type and Number:
Japanese Patent JP2012513581
Kind Code:
A
Abstract:
A method of determining a location of an event of interest by processing signals from a satellite positioning system comprises periodically recording blocks of data samples of a satellite broadcast. In response to a request for a position determination at a particular time, a most recent block of data samples is processed in an attempt to obtain a position fix. If unsuccessful, the method further comprises processing blocks of data samples which were recorded further back in time in a sequence to make further attempts to obtain a position fix, until a position fix is obtained. The blocks of data samples used for the further attempts are irregularly spaced in time, for example more densely populated in relatively recent time than in relatively ancient time with respect to the particular time. This enables the processing resource in attempting to obtain a position fix to be allocated efficiently, thereby reducing power consumption.
Inventors:
Chris, Marshall
Application Number:
JP2011541297A
Publication Date:
June 14, 2012
Filing Date:
December 03, 2009
Export Citation:
Assignee:
U-BLOX A.G.
International Classes:
G01S19/34; G01S19/14
Domestic Patent References:
| JP2000249565A | 2000-09-14 | |||
| JP2003524191A | 2003-08-12 | |||
| JP2004138562A | 2004-05-13 | |||
| JP2008533499A | 2008-08-21 | |||
| JP2002181556A | 2002-06-26 |
Attorney, Agent or Firm:
Hirohito Katsunuma
Yasukazu Sato
Yasushi Kawasaki
Takeshi Sekine
Akaoka Akira
Matsuno Chihiro
Yasukazu Sato
Yasushi Kawasaki
Takeshi Sekine
Akaoka Akira
Matsuno Chihiro