A Quick Location Method for High Dynamic GNSS Receiver Based on Time Assistance
Keywords:Global Navigation Satellite System(GNSS), signal transmission time recovery, high dynamic, Time to First Fix(TTFF)
Traditional A-GPS positioning method when quickly calculate a position,Â need a condition that the approximate position must not exceed 150km, otherwise theÂ calculation will be very complex. This paper proposes a time-assisted fast positioningÂ method for high dynamic GNSS receiver, effectively solving the problem of large searchÂ calculation in traditional method, even if exact position is unknown after the signal isÂ recaptured. According to the known auxiliary time information and implied Â elevationÂ information, this paper put forwards a custom coordinate system for building twodimensionalÂ search space, which could reduce the number of search-dimensions. ItÂ proposes a search method based on receiver clock calculated by analyzing the influenceÂ of time auxiliary accuracy. By using GPS ephemeris data provided by the IGS,Â it builds a simulation environment and analyzes the influence of different preferredÂ satellites based on the custom coordinate system on the calculation, and thus putsÂ forward a principle for choosing the preferred satellites. Simulation examples showÂ that through the rational combination of satellites to create a custom coordinateÂ system, and when time auxiliary accuracy is less than 60us, the calculation can 100%Â guarantee to restore a complete satellite signal emission time and obtain an accurateÂ position.
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