초록 ▼

A method and apparatus is disclosed for measurement processing of Satellite Positioning System (SPS) signals. A plurality of SPS signals from a corresponding plurality of SPS satellites are received in an SPS receiver. The signal environment corresponding to the location in which the SPS receiver is

A method and apparatus is disclosed for measurement processing of Satellite Positioning System (SPS) signals. A plurality of SPS signals from a corresponding plurality of SPS satellites are received in an SPS receiver. The signal environment corresponding to the location in which the SPS receiver is located is characterized to produce signal environment data. In one exemplary embodiment, an information source, such as a cellular network based database, is searched to retrieve the signal environment data given an approximate location of the GPS receiver. This approximate location may be specified by a location of a cell site which is in cellular radio communication with a cellular communication device which is co-located with the GPS receiver. One or more parameters related to signal characteristics of the satellite signals are defined. Threshold values for the parameters are determined using the signal environment data. Code phases corresponding to times of arrival of respective satellite signals from the plurality of satellites are measured. The data representing measured times of arrival are examined using threshold values for the parameters to produce a set of times of arrival from which a location fix for the GPS receiver is calculated. Other methods and apparatuses for other embodiments of the invention are also described.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of measuring times of arrival of satellite signals received in a Satellite Positioning System (SPS) receiver, said method comprising:receiving a plurality of SPS signals from a plurality of SPS satellites;characterizing a signal environment corresponding to the

[ What is claimed is:] [1.]1. A method of measuring times of arrival of satellite signals received in a Satellite Positioning System (SPS) receiver, said method comprising:receiving a plurality of SPS signals from a plurality of SPS satellites;characterizing a signal environment corresponding to the location in which said SPS receiver is located, to produce environment data which represents a manner in which SPS signals are propagated locally to said location;measuring times of arrival of respective satellite signals from two or more satellites of said plurality of satellites; andprocessing data representing said times of arrival using said environment data to produce a set of times of arrival with which to calculate a location fix for said SPS receiver.