Patent ID: 6590525
Filing Date: 2003-07-08
Classification: G01S,H04M,H04W

Abstract:
A GPS receiver comprising:a GPS signal antenna for receiving externally transmitted GPS signals; an analogue-to-digital converter coupled to the antenna for sampling the received GPS signal; a memory for storing the GPS signal samples; a digital GPS signal processor for processing the GPS signal samples stored in the memory to recover pseudorange information; and a controller for controlling the operation of the receiver; wherein the receiver has a dormant mode of operation in which received GPS signals are sampled and stored in the memory but the signal processor is not operative for recovering pseudorange information from the GPS signal samples, and an active mode of operation in which the signal processor is operative for recovering pseudorange information from the GPS signal samples, characterized in that the controller is arranged to cause a change from the dormant mode to the active mode in response to an instruction for a GPS position fix received by the receiver whilst the receiver is operating in the dormant mode.