发明授权
- 专利标题: Method and apparatus in positioning without broadcast ephemeris
- 专利标题(中): 无广播星历的定位方法和设备
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申请号: US11741448申请日: 2007-04-27
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公开(公告)号: US07869948B2公开(公告)日: 2011-01-11
- 发明人: Shaowei Han
- 申请人: Shaowei Han
- 申请人地址: US CA San Jose
- 专利权人: SiRF Technology, Inc.
- 当前专利权人: SiRF Technology, Inc.
- 当前专利权人地址: US CA San Jose
- 代理机构: Haynes & Boone, LLP.
- 主分类号: G01C21/20
- IPC分类号: G01C21/20
摘要:
Provided herein are methods and system for enabling a navigation receiver to generate receiver specific satellite orbital models based on relatively small sets of parameters obtained from a server. In an embodiment, a set of parameters for a satellite includes a force parameter (e.g., solar radiation pressure), initial condition parameters (e.g., satellite position and velocity at a time instance) and time correction coefficients, which the receiver uses in a numerical integration to predict the position of the satellite. The set of parameters needed for the integration is small compared to current methods which require transmission of a complete set of ephemeris and other parameters for each satellite. Since the set of parameters is relatively small, it requires less communication resources to transmit compared to current methods. Further, the integration based on the small set of parameters enables the receiver to predict satellite orbits with low computational load.
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