Abstract: A disclosed algorithm enables fast and efficient location of a mobile unit by obtaining and processing a snapshot of signals from all satellites in view of a constellation such as the Global Positioning System. The method is capable of dealing with weak signals and requires minimal use of processing time and use of communications resources. Each satellite transmits a signal that consists of a series of frames of a pseudo-noise sequence whereupon is superimposed a satellite data message. The total signal received from the satellite network by the mobile unit is arranged as columns of a matrix and is processed coherently to provide estimated pseudo-ranges and estimated rates of change of pseudo-ranges for in-view satellites. The coherent processing includes performing an initial orthogonal transform on the rows of the matrix and, uses prior knowledge to select that portion of the matrix containing a particular satellite signal for further processing.

Abstract: A method for calibrating a receiver employing integrated location procedures, wherein signals from two radio net-work sources are employed. A system delay (46) is calculated for a first network, and another system delay (46) is calculated for a second network. The differential system delay (50) is stored (53) and used in future location determination sessions. The differential system delay is updated repeatedly, if reception conditions permit.