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Patent 8009086 Click For Printable Version of This Patent
Patent Information:  USPTO Site Listing

Patent Number: 8009086
Case ID: 0
Patent Title: System and method for geo-locating a receiver with reduced power consumption
Status: ACTIVE
Status Date: 12/2/2011 12:54:10 PM
Issue Date: 8/30/2011
Filed Date: 8/16/2010
Serial #: 2/856,878
Assignee Name: The United States of America as represented by the Secretary of the Navy (Washington, DC)
Inventor(s): Grossnickle, Peter C. , Buck, Heidi L. , Fleizach, Gregory , Fronk, Alan , Fong, Matthew , Hunt, Barry R. , Nicholson, Matthew , Williams, Brian T.
Lab Information:  View Lab Profile

Lab Name: SPAWAR Systems Center, Pacific
Location: 53560 Hull Street
San Diego, CA 92152-5001
Contact: Contact Lab About This Patent

1. Field of the Invention

The present invention relates generally to the field of global positioning systems. More specifically, the present invention relates to components and methods useful for reducing power consumption in global positioning system receivers and improving processes for locating and tracking assets.

2. Description of the Related Art

The Global Positioning System (GPS) is used to, among other functions, determine location. Developed initially by the United States Department of Defense, the GPS is comprised of space vehicles or satellites (hereafter "SV"), a Master control facility and one or more receivers, usually referred to as GPS receivers. More particularly, there are 31 SVs that orbit the earth in approximately 12 hours. The SV orbits repeat virtually the same ground track once each day and repeat the same track and configuration over any point with reliable regularity. There are six orbital  . . . . More
A system and process for the geo-location of an asset given no a priori knowledge regarding time and location of the asset with minimized power consumption is disclosed. In the preferred embodiment, the system is accurate to about 30 meters CEP (50% circular error probable) using just a short segment, e.g., 100-200 ms, of digitized GPS L1 signal data.
We claim:

1. A system for determining a position estimate for a remote asset comprising: at least one receiver located on the remote asset for collecting GPS signal information from multiple space vehicles and generating a signal delay for each of the multiple space vehicles, the receiver including an upload filter to select generated signal delays for transmission using predetermined criteria; at least one transmitter located on the remote asset for transmitting the selected signal delays; a ground station including a geo-location processor and a navigation database for receiving the transmitted signal delays and computing a position estimate for the remote asset.

2. The system according to claim 1, wherein the GPS signal information is transmitted from each of the multiple space vehicles at a signal frequency of 1575.42 MHz and is collected by the at least one receiver for a period of 100-200 ms.

3. The system according to claim 1, wherein the length of . . . . More