초록 ▼

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) coverag

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.

대표청구항 ▼

[ What is claimed is:] [13.] An apparatus comprising:location finding equipment coupled to the database, the location finding equipment having an independently transmitted first location of a mobile unit as an input and outputting an error vector based on the first location of the mobile unit and an

[ What is claimed is:] [13.] An apparatus comprising:location finding equipment coupled to the database, the location finding equipment having an independently transmitted first location of a mobile unit as an input and outputting an error vector based on the first location of the mobile unit and an estimated location of the mobile unit; anda database having the error vector and the estimated location of the mobile unit as an input.