- 专利标题: GNSS signal processing with ionospheric bridging for reconvergence
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申请号: US14002332申请日: 2012-03-11
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公开(公告)号: US09651677B2公开(公告)日: 2017-05-16
- 发明人: Rodrigo Leandro , Ulrich Vollath , Nicholas Charles Talbot
- 申请人: Rodrigo Leandro , Ulrich Vollath , Nicholas Charles Talbot
- 申请人地址: US CA Sunnyvale
- 专利权人: Trimble Inc.
- 当前专利权人: Trimble Inc.
- 当前专利权人地址: US CA Sunnyvale
- 代理机构: Kilpatrick Townsend & Stockton LLP
- 国际申请: PCT/US2012/028670 WO 20120311
- 国际公布: WO2012/128979 WO 20120927
- 主分类号: G01S19/44
- IPC分类号: G01S19/44 ; G01S19/43 ; G01S19/04 ; G01S19/09 ; G01S19/07 ; G01S19/32
摘要:
Methods and apparatus provide for positioning of a rover antenna from GNSS data derived from multi-frequency signals and correction data derived from a network of reference stations. Rover antenna position and multi-frequency ambiguities are estimated at each epoch. An ionospheric filter models variation in ionospheric bias per satellite. A set of ionospheric carrier-phase ambiguities is estimated at least when the multi-frequency ambiguities have attained a predetermined precision. The estimated ionospheric carrier-phase ambiguities are cached. After detecting interruption of signal at the rover antenna and determining reacquisition of signals at the rover antenna, an ionospheric bias per satellite over an interruption interval is predicted. For each satellite, a cached ionospheric carrier-phase ambiguity is combined with a predicted ionospheric bias to obtain a post-interruption ionospheric ambiguity estimate. The post-interruption ionospheric ambiguity estimates are used to aid estimation of rover antenna position after signal reacquisition.