DOPPLER SHIFT CORRECTION USING THREE-DIMENSIONAL BUILDING MODELS

摘要

Techniques for GNSS positioning using three-dimensional (3D) building models are described. A processor can determine a probable path for a signal from a GNSS space vehicle (e.g., a satellite) to reach the GNSS receiver. The probable path can include one or more specular reflections. The processor can determine a Doppler correction based on the probable path, including inverting a sense of a vector of the Doppler correction for each reflection. The processor can then incorporate the Doppler correction in an estimated velocity of the mobile device, an estimated position of the mobile device, or both.

主权项

1. A method comprising:
determining, by a processor of a mobile device, a plurality of candidate locations of the mobile device based on an estimated position provided by the GNSS receiver; receiving geographic feature data, the geographic feature data including locations and heights of geographic features that are estimated to interfere with signals received by the GNSS receiver; determining an estimated signal path for a signal to reach from a satellite of the GNSS to the GNSS receiver, including determining one or more reflections of the signal by the geographic features and determining an uncertainty value based on the candidate locations; estimating a Doppler correction of the signal based on a count of the reflections in the signal path, wherein for each reflection, the processor inverts a sense of a vector of the Doppler correction; and providing the estimated Doppler correction to the GNSS receiver for estimating at least one of a position of the mobile device or a velocity of the mobile device.