초록 ▼

A process and machine for estimating the location of a wireless terminal is disclosed. The illustrative embodiment of the present invention is based on the observation that the signal strength of a signal from a transmitter is different at some locations, and, therefore, the location of a wireless t

A process and machine for estimating the location of a wireless terminal is disclosed. The illustrative embodiment of the present invention is based on the observation that the signal strength of a signal from a transmitter is different at some locations, and, therefore, the location of a wireless terminal can be estimated by comparing the signal strength it currently observes against a map or database that correlates locations to signal strengths. In accordance with a first example, if a particular radio station is known to be received well at a first location and poorly at a second location, and a given wireless terminal at an unknown location is receiving the radio station poorly, it is more likely that the wireless terminal is at the second location than it is at the first location.

대표청구항 ▼

What is claimed is: 1. A process comprising:receiving a first reported signal-strength measurement, R(1,n), from a wireless terminal; andgenerating a first calibrated signal-strength measurement, S(1,n), based on: (i) the first reported signal-strength measurement, R(1,n), and (ii) an identifying ch

What is claimed is: 1. A process comprising:receiving a first reported signal-strength measurement, R(1,n), from a wireless terminal; andgenerating a first calibrated signal-strength measurement, S(1,n), based on: (i) the first reported signal-strength measurement, R(1,n), and (ii) an identifying characteristic, C, of the wireless terminal;wherein the first reported signal strength is for a first signal received by the wireless terminal; andwherein the identifying characteristic, C, identifies the wireless terminal in comparison to another wireless terminal capable of receiving the first signal.