发明申请
- 专利标题: Geolocation subsystem
- 专利标题(中): 地理位置子系统
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申请号: US10408171申请日: 2003-04-04
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公开(公告)号: US20030222817A1公开(公告)日: 2003-12-04
- 发明人: Fritz Gfeller , Pierre Chevillat , Wolfgang Schott
- 申请人: International Business Machines Corporation
- 申请人地址: NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: NY Armonk
- 优先权: EP02009752.3 20020430
- 主分类号: H01Q003/22
- IPC分类号: H01Q003/22
摘要:
The present invention provides apparatus and methods for determining a propagation time of a signal transmitted from a first location to a second location as a request signal and received as a response signal by the first location via a channel. In an example embodiment, a method comprises the step of determining the propagation time of the signal based on a local counter value that represents the time between transmission of the request signal and reception of the response signal, a remote counter value that depends on the request signal and being known to the first location, and a determinable time-delay value. The remote counter value represents an inter-time-delay between the reception of the request signal and the start of transmission of the response signal at the second location.
公开/授权文献
- US06823284B2 Geolocation subsystem 公开/授权日:2004-11-23