Title:
時間測定に基づく衛星測位システムのための方法および装置
Document Type and Number:
Japanese Patent JP4757291
Kind Code:
B2
Abstract:
A method and apparatus for measuring time related to satellite data messages which are used with satellite positioning systems (SPS). In one method, a first record of at least a portion of a satellite data message is received at an entity, which is typically a basestation. The first record is compared with a second record of the satellite data message, where the first record and the second record overlap at least partially in time. Then a time is determined from this comparison, and this time indicates when the first record (or the source from which the first record was obtained) was received at a remote entity which is typically a mobile SPS receiver. Various other methods of the invention are described and various apparatuses of the invention are also described. The methods and apparatuses measure time of day using SPS signals without reading the satellite data messages which are transmitted as data within these signals. The methods and apparatuses are suitable for situations in which the received signal level is too weak to allow reading of the satellite data messages.
Inventors:
Clasmer, Norman F
Application Number:
JP2008247698A
Publication Date:
August 24, 2011
Filing Date:
September 26, 2008
Export Citation:
Assignee:
EPCOS AG
International Classes:
G04G5/00; G01S1/00; G01S5/00; G01S19/09; G01S19/24; G01S19/25; G01S19/42; G04G7/02; G01S19/23
Domestic Patent References:
| JP5030024A | ||||
| JP4086581A |
Foreign References:
| WO1995008778A1 |
Attorney, Agent or Firm:
Masaki Yamakawa
Shigeki Yamakawa
Shigeki Yamakawa