Apparatus and method for determining position information of a mobile station

An apparatus for receiving Mobile Station (MS) position acquisition signals from the mobile communication system, and receiving a reference signal from a satellite in order to estimate position information of the MS, comprising:

• a position signal acquisition unit for receiving the MS position acquisition signals, acquiring a position signal from the reference signal received from the satellite, and outputting an acquired position signal;
• a primary position calculator for calculating a primary position using the acquired position signal received from the position signal acquisition unit;
• a propagation delay error range setup unit for determining a propagation delay error range using the acquired position signal;
• a propagation delay error estimator for estimating a propagation delay error using the determined propagation delay error range and the primary position;
• and
• a position calculator for calculating a secondary position using the propagation delay error estimation value and the calculated primary position.

A method for receiving MS position acquisition signals from a mobile communication system, receiving a reference signal from a satellite, and estimating position of the MS, comprising the steps of:

• a) receiving the MS position acquisition signals, acquiring a position signal from the received MS position_acquisition signal, outputting an acquired position signal, and calculating a primary position using the acquired position signal;
• b) determining a propagation delay error range using the acquired position signal;
• c) estimating a propagation delay error using the determined propagation delay error range and the calculated primary position;
• and
• d) calculating a secondary position using the primary position solution and the estimated propagation delay error, and interpreting the calculated secondary position as estimated position of the MS.