METHOD AND APPARATUS FOR MEASUREMENT PROCESSING OF SATELLITE POSITIONING SYSTEM (SPS) SIGNAL

摘要

PROBLEM TO BE SOLVED: To provide an algorithm utilizing various kinds of available data to achieve an optimal location solution.

SOLUTION: SPS signals from SPS satellites are received in an SPS receiver. The signal environment corresponding to the location of the SPS receiver is characterized to generate signal environment data. For example, 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. The approximate location may be designated by a location of a cell site which is in cellular radio communication with a cellular communication device arranged in the same location as the GPS receiver. Parameters related to signal characteristics of the satellite signals are defined, and the 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 measured data are examined using threshold values for the parameters to produce a set of times of arrival from which a location of the GPS receiver is calculated.

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