Patent ID: 6388618
Filing Date: 2002-05-14
Classification: G01S,H04W,Y02D

Abstract:
A wireless location system comprising a plurality of signal collection systems (SCSs) each including a narrowband receiver module wherein the narrowband receiver module comprises a narrowband receiver that receives at most a few RF channels at a time, wherein the wireless location system performs the following steps:a) determining the cell site, sector, RF channel, timeslot, long code mask, and encryption key currently in use by the first wireless transmitter; b) tuning a first narrowband receiver at a first SCS to the RF channel and timeslot at a designated cell site and sector; c) based on a time segment of RF data from the first narrowband receiver, evaluating the transmission's power, SNR, and modulation characteristics; d) if the transmission's power or SNR is below a predetermined threshold, waiting a predetermined length of time and then returning to the above step (a).