Differential vector phase locked loop gps reception method

Abstract

A method for enhancing GPS location accuracy includes providing a base station receiver having a known surveyed location, and a roving receiver at a location distinct from the base station receiver. The method further includes receiving single-frequency code and carrier-phase measurements from the base station, and translating the single-frequency code and carrier-phase measurements to a Kalman filter-predicted location of the roving receiver. The translated single frequency code and carrier phase measurements are used to generate a local replica of the Kalman filter-predicted location signals for each channel of the roving receiver. The method further includes correlating the local replicas with an incoming signal of the roving receiver to generate a plurality of tracking error estimates. The plurality of tracking error estimates are used to update navigation states and clock update states thereof. The method also includes estimating delta tb1 and discarding local channel information prior to performing subsequent iterations.