Patent ID: 6133871
Filing Date: 2000-10-17
Classification: G01S,G06F,H01Q,H03D,H03J,H04B

Abstract:
A method of power management for a GPS receiver, said method comprising:receiving at said GPS receiver, GPS signals from in view satellites and consuming power by a GPS receiving section of said GPS receiver at a first rate while receiving said GPS signals;digitizing said GPS signals to provide a digital representation of said GPS signals:buffering said digital representation of said GPS signals in a digital memory;reducing power consumed by said GPS receiving section of said GPS receiver to a second rate, which is less than said first rate, after buffering said digital representation, wherein said GPS receiving section downconverts GPS radiofrequency signals to an intermediate frequency:processing said digital representation by retrieving said digital representation from said digital memory and processing said digital representation to provide at least one pseudorange information, said processing being performed after said reducing power, said processing comprising a fast convolution operation on said digital representation of said GPS signals which are buffered in a memory;wherein the amount of said digital representation of said GPS signals which are buffered in said memory may be varied to trade off sensitivity with power reduction.