METHOD, SYSTEM, AND APPARATUS FOR REDUCING INACCURACY IN GLOBAL NAVIGATION SATELLITE SYSTEM POSITION AND VELOCITY SOLUTION

摘要

A Global Navigation Satellite System (GNSS) receiver determines a measurement error covariance from a reference position and a set of measured pseudoranges from a set of GNSS satellites. The position and velocity solution is determined from the measurement error covariance and the set of measured pseudoranges. The measurement error covariance is determined as function of the difference between a reference pseudorange and measured pseudorange. The reference pseudorange is computed from the reference position to a satellite. The measurement error covariance is determined as function of the difference only if the measured pseudorange is greater than the reference pseudorange. The GNSS receiver also determines measurement error covariance as function of one or more of correlation peak shape, difference, the correlation peak shape, a received signal to noise ratio and a tracking loop error.

主权项

1. A method comprising:
determining a first pseudorange from a first Global Navigation Satellite System (GNSS) satellite; determining a reference range from a reference position to the first GNSS satellite; and determining a measurement error from the reference range and the first pseudorange.