Improved use of global positioning system in locating a radio transmitter

摘要

An apparatus is described for making radio signal timing measurements in a radio communication network, comprising: an input for receiving a radio signal transmitted in the radio communication network; an input for providing at a first location a plurality of satellite-based clock signals respectively derived from a plurality of satellite timing references; a signal timing determiner coupled to said inputs for using at least one of said satellite-based clock signals to produce a signal timing measurement of the received radio signal; a clock skew determiner coupled to said clock signal input and responsive to first and second ones of said satellite-based clock signals for providing clock skew information indicative of a timing discrepancy between the first and second satellite-based clock signals caused by a discrepancy between the respective satellite timing references from which the first and second satellite-based clock signals are derived; and an output for outputting said signal timing measurement and said clock skew information.