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专利名称：Extended range high sensitivity SPS
positioning receiver
发明人：Paul W. McBurney,William J. Morrison,Justin
A. Vandergrift,Kenneth U. Victa
申请号：US11360880申请日：20060223
公开号：US20070057841A1公开日：20070315
专利附图：
摘要：A satellite positioning system comprises a plurality of mobile clients that canmove in and out of a wireless service area. Such area is more or less fixed and supported
by a base station, e.g., a mobile telephone cell. The service area and/or the base station isassociated with an identity code that can be queried. Each mobile client includes anautonomous GPS receiver that does not require aiding information to produce a positionfix, but will produce such fix quicker and at higher sensitivity if aiding information issupplied. A local memory is used to store a limited number of cell-ID identity codesassociated with previously determined positions for those sites. The mobile clientsfurther include a cellular telephone that can support Internet access to a mobile aidingserver. An ID-registration database is used to collect aiding information collected andcontributed in the past by other mobile clients. Such database is co-located with themobile aiding server and will supply requests for aiding information. When a mobile cliententers a new service area and is required to produce a fix, it consults its own localmemory and then the Internet server for information related to the particular cell-ID.Such aiding information includes the approximate position of the mobile client, and thisreduces the position and Doppler uncertainties during a cold start. The range ofpositioning is extended when the signal is too weak to allow successful decoding of allnavData by using the data bit phase, codephase, and a prior position estimate.
申请人：Paul W. McBurney,William J. Morrison,Justin A. Vandergrift,Kenneth U. Victa
地址：San Francisco CA US,San Francisco CA US,San Francisco CA US,San Francisco CAUS
国籍：US,US,US,US
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