초록 ▼

A precision carrier frequency signal for calibrating a local oscillator of a GPS receiver which is used to acquire GPS signals. The precision carrier frequency signal is used to calibrate the local oscillator such that the output of the local oscillator, which is used to acquire GPS signals, is modi

A precision carrier frequency signal for calibrating a local oscillator of a GPS receiver which is used to acquire GPS signals. The precision carrier frequency signal is used to calibrate the local oscillator such that the output of the local oscillator, which is used to acquire GPS signals, is modified by a reference signal generated from the precision carrier frequency signal. The GPS receiver locks to this precision carrier frequency signal and generates the reference signal. In another aspect of the invention, satellite almanac data is transmitted to a remote GPS receiver unit from a basestation via a communication link. The remote GPS receiver unit uses this satellite almanac data to determine approximate Doppler data for satellites in view of the remote GPS receiver unit.

대표청구항 ▼

[ What is claimed is:] [1.] In a method for determining the position of a remote unit, a process comprising:receiving, at said remote unit, a satellite almanac information for a plurality of satellites in view of said remote unit from a source other than a Satellite Positioning System satellite; and

[ What is claimed is:] [1.] In a method for determining the position of a remote unit, a process comprising:receiving, at said remote unit, a satellite almanac information for a plurality of satellites in view of said remote unit from a source other than a Satellite Positioning System satellite; andcomputing, in said remote unit, a position information for said remote unit by using a Doppler information derived from said satellite almanac information.