Patent Number: 6,295,024

Title: Autonomous data aided GPS signal acquisition method and system

Abstract: A data-aided system and method of GPS signal acquisition from a plurality of broadcasted GPS signals includes receiving (401) the GPS signals and providing a digitized signal. Then, a first portion (407) of the digitized signal is correlated to a code replica and a real-time code phase delay is determined. A capture start time is determined (411) dependent on a Time Of Arrival (409) based on the determined real-time code phase delay. Next, a second portion of the digitized signal is captured into a memory (413) commencing coincident with the determined capture start time. Then the second portion of the digitized signal is extracted from the memory and correlated to the code replica (411) to determine an off-line code phase delay. A position fix is calculated (417) and includes the off-line code phase delay.

Inventors: King; Thomas M. (Tempe, AZ), Durboraw, III; Issac N. (Scottsdale, AZ)

Assignee: Motorola, Inc.

International Classification: G01S 1/00 (20060101); G01S 005/02 (); H04B 007/185 ()

Expiration Date: 09/25/2018