Method and apparatus for calibrating location finding equipment

Details Method and apparatus for calibrating location finding equipment Method and apparatus for calibrating location finding equipment

1998-04-17

2000-01-11

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Position indicating

34235706, 34235709, 701213, 701214, G01S 302

Patent

active

060141026

ABSTRACT:
Error vectors are added to any position estimate determined by Location finding equipment (LFE) in order to give a corrected position estimate. Error vectors are determined utilizing calibration terminals (114), which are roaming vehicles that move throughout the communication system's (100) coverage area. Each calibration terminal (114) comprises a remote unit (113) coupled with an independent position determining system (167) such as a Global Positioning System (GPS) receiver. Error vectors are determined by periodically polling calibration terminals (114). In response, each terminal (114) sends back a reply message containing their actual, independently determined location, along with periodically broadcasting a known sequence at increased power utilized by the LFE in determining a position estimate of the calibration terminal (114). The difference between the actual, and LFE determined position estimates are utilized in calculation of error vectors.

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patent: 5523763 (1996-06-01), Loomis
patent: 5686902 (1997-11-01), Reis et al.

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