METHOD OF FAST FIRST FIX USING LOW COST GNSS RECEIVERS

摘要

A method offast first fix using a low cost GNSS receiver is represented. The method allows reducing significantly the time to first fix in the case that GNSS ephemerides, good estimates of the initial user position and time are available. It is also proposed to use Doppler measurements for the initial estimate of the user coordinates. Expected time to first fix depending on the input GNSS signal power is calculated.