FreshPatents.com Logo
stats FreshPatents Stats
5 views for this patent on FreshPatents.com
2013: 3 views
2012: 2 views
Updated: April 14 2014
newTOP 200 Companies filing patents this week


    Free Services  

  • MONITOR KEYWORDS
  • Enter keywords & we'll notify you when a new patent matches your request (weekly update).

  • ORGANIZER
  • Save & organize patents so you can view them later.

  • RSS rss
  • Create custom RSS feeds. Track keywords without receiving email.

  • ARCHIVE
  • View the last few months of your Keyword emails.

  • COMPANY DIRECTORY
  • Patents sorted by company.

AdPromo(14K)

Follow us on Twitter
twitter icon@FreshPatents

Position estimation for navigation devices

last patentdownload pdfdownload imgimage previewnext patent


Title: Position estimation for navigation devices.
Abstract: A method of providing position estimation with a navigation device comprises periodically recording magnetic field strength of an area substantially surrounding a navigation device as a user of the navigation device traverses a select pathway. The method combines the recorded magnetic field strength with measurements from at least a dead reckoning portion of the navigation device to provide position estimates along the select pathway. The method further corrects each of the position estimates from a starting position on the select pathway, where each of the corrected position estimates have an error value below one or more previous position estimates and any intervening positions between each of the one or more previous position estimates and the starting position, with the error value corresponding to an error threshold based on the previous position estimates. ...


Browse recent Honeywell International, Inc. patents - Morristown, NJ, US
Inventors: Tom Judd, Bruce Graham, Toan Vu
USPTO Applicaton #: #20120173139 - Class: 701466 (USPTO) - 07/05/12 - Class 701 


view organizer monitor keywords


The Patent Description & Claims data below is from USPTO Patent Application 20120173139, Position estimation for navigation devices.

last patentpdficondownload pdfimage previewnext patent

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of pending U.S. application Ser. No. 12/059,865 entitled “POSITION ESTIMATION FOR NAVIGATION DEVICES,” filed Mar. 31, 2008, which is incorporated herein by reference.

GOVERNMENT INTEREST STATEMENT

The U.S. Government may have certain rights in the present invention under contract No. HDTRA-06-6-C-0058, subcontract No. CHI-06022-001 as awarded by the Defense Threat Reduction Agency.

BACKGROUND

Reliable navigation systems and devices have always been essential for estimating both distance traveled and position. For example, early navigating was accomplished with “deduced” or “dead” reckoning. In dead-reckoning, a navigator finds a current position by measuring the course and distance the navigator has moved from some known point. Starting from the known point, the navigator measures out a course and distance from that point. Each ending position will be the starting point for the course-and-distance measurement. In order for this method to work, the navigator needs a way to measure a course and a way to measure the distance traveled. The course is measured by a magnetic compass. In pedestrian dead reckoning, the distance is the size of a single step. A position estimate is derived by the integration of distance and direction over a sequence of steps. This type of navigation, however, is highly prone to errors, which when compounded can lead to highly inaccurate position and distance estimates.

In more advanced navigation systems, such as an inertial navigation system (INS), positional errors can accumulate over time. For example, any navigation performed in areas where satellite or radar tracking measurements are inaccessible or restrictive (such as areas where global positioning system, or GPS, measurements are “denied”) is susceptible to the accumulation of similar positional errors. Moreover, in the dead-reckoning methods discussed above, these positional errors accumulate based on the distance traveled. There is a need in the art for improvements in position estimation for navigation devices.

SUMMARY

The following specification provides for at least one method of position estimation for navigation devices using sensor data correlation. This summary is made by way of example and not by way of limitation. It is merely provided to aid the reader in understanding some aspects of at least one embodiment described in the following specification.

Particularly, in one embodiment, a method of providing position estimation with a navigation device comprises periodically recording magnetic field strength of an area substantially surrounding a navigation device as a user of the navigation device traverses a select pathway. The method combines the recorded magnetic field strength with measurements from at least a dead reckoning portion of the navigation device to provide position estimates along the select pathway. The method further corrects each of the position estimates from a starting position on the select pathway, where each of the corrected position estimates have an error value below one or more previous position estimates and any intervening positions between each of the one or more previous position estimates and the starting position, with the error value corresponding to an error threshold based on the previous position estimates.

DRAWINGS

These and other features, aspects, and advantages are better understood with regard to the following description, appended claims, and accompanying drawings where:

FIG. 1 is a block diagram of a navigation device;

FIGS. 2A and 2B are traversing diagrams of navigating in a select pathway;

FIG. 3A is a traversing diagram of navigating in a select pathway prior to position correction;

FIG. 3B is a traversing diagram of navigating in the select pathway of FIG. 3A after position correction;

FIG. 4A is a traversing diagram of a select pathway with at least one marked position before sensor data correlation at a selected position;

FIG. 4B is a traversing diagram of navigating in a select pathway showing one or more positions that correlate with the marked position of FIG. 4A;

FIG. 4C is a traversing diagram of navigating in the select pathway of FIG. 4B after the correlated positions have been corrected;

FIG. 5A is a traversing diagram of navigating in a select pathway using a navigation device indicating the positions which are correlated;

FIGS. 5C is the azimuth data and 5B is the calculated correlation function diagram from the navigation device of FIG. 5A;



Download full PDF for full patent description/claims.

Advertise on FreshPatents.com - Rates & Info


You can also Monitor Keywords and Search for tracking patents relating to this Position estimation for navigation devices patent application.
###
monitor keywords



Keyword Monitor How KEYWORD MONITOR works... a FREE service from FreshPatents
1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored.
3. Each week you receive an email with patent applications related to your keywords.  
Start now! - Receive info on patent apps like Position estimation for navigation devices or other areas of interest.
###


Previous Patent Application:
System and method for providing geographic information in private webpage
Next Patent Application:
Inertial sensor aided heading and positioning for gnss vehicle navigation
Industry Class:
Data processing: vehicles, navigation, and relative location
Thank you for viewing the Position estimation for navigation devices patent info.
- - - Apple patents, Boeing patents, Google patents, IBM patents, Jabil patents, Coca Cola patents, Motorola patents

Results in 0.50933 seconds


Other interesting Freshpatents.com categories:
Novartis , Pfizer , Philips , Procter & Gamble , -g2--0.8628
     SHARE
  
           

FreshNews promo


stats Patent Info
Application #
US 20120173139 A1
Publish Date
07/05/2012
Document #
12971265
File Date
12/17/2010
USPTO Class
701466
Other USPTO Classes
International Class
01C21/00
Drawings
12



Follow us on Twitter
twitter icon@FreshPatents