An improved GPS receiver utilizing satellite position information for compensating Doppler

摘要

The invention concerns a Method for determining the position of a remote unit, comprising: receiving at said remote unit, a satellite position information for a plurality of satellites of a satellite positioning system from a separately located basestation or antother satellite emulating a basestation; determining approximate time of day and position of the remote unit; deriving Doppler information for a plurality of said satellites of said satellite positioning system from said satellite position information using the approximate time of day and position; receiving GPS signals from said satellites of said satellite positioning system; computing, in said remote unit, pseudoranges for said remote unit, wherein said Doppler information compensate for Doppler shift in said GPS signals which are received from said satellites of said satellite positioning system to compute pseudoranges at the remote unit.