| US 7,592,949 B2 | ||
| Near field electromagnetic positioning calibration system and method | ||
| Hans Gregory Schantz, Huntsville, Ala. (US); and David Wesley Langford, Madison, Ala. (US) | ||
| Assigned to Q-Track Corporation, Huntsville, Ala. (US) | ||
| Filed on Nov. 19, 2007, as Appl. No. 11/986,319. | ||
| Application 11/986319 is a division of application No. 10/958165, filed on Oct. 04, 2004, granted, now 7,298,314. | ||
| Application 10/958165 is a continuation in part of application No. 10/355612, filed on Jan. 31, 2003, granted, now 6,963,301. | ||
| Claims priority of provisional application 60/562413, filed on Apr. 15, 2004. | ||
| Claims priority of provisional application 60/404602, filed on Aug. 19, 2002. | ||
| Claims priority of provisional application 60/404604, filed on Aug. 19, 2002. | ||
| Prior Publication US 2008/0165050 A1, Jul. 10, 2008 | ||
| Int. Cl. G01S 7/40 (2006.01) | ||
| U.S. Cl. 342—174 [342/165] | 10 Claims |
| 1. A method for calibrating an electromagnetic position determination system, said position determining system determining
an unknown position of a beacon transmitter within a predefined region by generating a positioning data set and matching said
positioning data set with a plurality of calibration data sets; said unknown position determined based on a position corresponding
to a calibration data set of said plurality of calibration data sets, that most closely matches said positioning data set;
said method for calibrating said position determination system comprising:
1) generating a calibration database containing said plurality of calibration data sets, each calibration data set of said
plurality of calibration data sets generated by:
a) transmitting a calibration transmission from a respective known transmitter position of a plurality of transmitter positions
within said predefined region;
b) receiving said calibration transmission at a plurality of known receiver positions and producing said calibration dataset,
each said calibration data set comprising a plurality of comparison values comparing two received signal characteristics of
said calibration transmission at each receiver position of said plurality of known receiver positions;
c) associating each said calibration dataset with said respective known transmitter position; and
d) storing each said calibration dataset and said respective known transmitter position in said calibration database.
|