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专利名称：DISTRIBUTED ORBIT MODELING AND
PROPAGATION METHOD FOR A PREDICTEDAND REAL-TIME ASSISTED GPS SYSTEM
发明人：LAMANCE, JAMES, W.,EAGEN, MARIA,ROY-MACHABEE, GUYLAIN
申请号：EP07845550申请日：20071119公开号：EP2223147A4公开日：20150527
摘要：A distributed orbit and propagation method for use in a predicted GPS or GNSSsystem, which includes a predicted GPS server (PGPS Server), a source of high accuracyorbit predictions (Orbit Server), a global reference network (GRN Server) providing real-time GPS or GNSS assistance data to the PGPS Server, a predicted GPS client (PGPS Client)running on a device equipped with a GPS or AGPS chipset. In response to requests fromthe PGPS Client, the PGPS Server produces and disseminates an initial seed datasetconsisting of current satellite orbit state vectors and orbit propagation model
coefficients. This seed dataset enables the PGPS Client to locally predict and propagatesatellite orbits to a desired future time. This predictive assistance in turn helps accelerateTime To First Fix (TTFF), optimize position solution calculations and improve the
sensitivity of the GPS chip present on, or coupled with, the device. In contrast with otherconventional predicted GPS systems that forward large volumes of predicted orbits,synthetic ephemeris or synthetic almanac data, this method optimally reduces datatransfer requirements to the client, and enables the client to locally synthesize its own
predicted assistance data as needed. This method also supports seamless notification ofreal-time satellite integrity events and seamless integration of predicted assistance datawith industry standard real-time assistance data.
申请人：RX NETWORKS INC.
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